Classroom index | Originals and full outcomes

R02 | ODSC Demo 03B | Context / Older notes | DeepSeek Flash | reserve

Read the full outcome matrix before this selected trace

Context correction: Automatic memory was not disabled. The selected trial-2 conditions share the same ambient user memory and skill listings; only the supplied task notes differ. Historical memory-off wording is not a verified claim. The prompt explicitly permits clarification, and the older draft is marked provisional.

Read-only historical evidence. Original commands are never executed by the archive. Original published teaching history, with additional privacy-only redactions of ambient context and device metadata. No new run.

ConversationStateUpdateEvent
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              "repo docs",
              "documentation automation",
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              "update wiki",
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            ]
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          "inputs": [],
          "is_agentskills_format": true,
          "version": "1.0.0",
          "description": "Generate and maintain durable repository documentation for humans and future coding agents. Use when asked to plan, initialize, update, repair, or automate repo docs, including OpenWiki-style docs and optional GitNexus-enriched docs.",
          "disable_model_invocation": false
        },
        {
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          "source": "/Users/instructor/.openhands/plugins/installed/autodocs/commands/init.md",
          "inputs": [],
          "is_agentskills_format": false,
          "version": "1.0.0",
          "description": "Initialize durable repository documentation for the current repository",
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        },
        {
          "name": "autodocs:plan",
          "content": "[REDACTED: unrelated ambient skill definition]",
          "trigger": {
            "type": "keyword",
            "keywords": [
              "/autodocs:plan"
            ]
          },
          "source": "/Users/instructor/.openhands/plugins/installed/autodocs/commands/plan.md",
          "inputs": [],
          "is_agentskills_format": false,
          "version": "1.0.0",
          "description": "Plan durable repository documentation without editing files",
          "disable_model_invocation": false
        },
        {
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          "content": "[REDACTED: unrelated ambient skill definition]",
          "trigger": {
            "type": "keyword",
            "keywords": [
              "/autodocs:update"
            ]
          },
          "source": "/Users/instructor/.openhands/plugins/installed/autodocs/commands/update.md",
          "inputs": [],
          "is_agentskills_format": false,
          "version": "1.0.0",
          "description": "Update existing durable repository documentation from recent repository changes",
          "disable_model_invocation": false
        }
      ],
      "load_user_skills": false,
      "load_public_skills": false,
      "marketplace_path": "marketplaces/default.json",
      "registered_marketplaces": [],
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    },
    "system_prompt_filename": "system_prompt.j2",
    "security_policy_filename": "security_policy.j2",
    "system_prompt_kwargs": {
      "llm_security_analyzer": true
    },
    "condenser": {
      "llm": {
        "model": "openhands/deepseek-v4-flash",
        "api_key": null,
        "auth_type": "api_key",
        "openrouter_site_url": "https://docs.all-hands.dev/",
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SystemPromptEvent
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  "source": "agent",
  "parent_id": "__root__",
  "system_prompt": {
    "cache_prompt": false,
    "type": "text",
    "text": "[REDACTED: ambient system/context, private source hash retained by instructor]"
  },
  "tools": [
    {
      "description": "Execute a shell command in the terminal within a persistent shell session.\n\n\n### Command Execution\n* One command at a time: You can only execute one shell command at a time.\n  If you need to run multiple commands sequentially, use `&&` or `;`.\n* Persistent session: Environment variables, virtual environments, and\n  working directory changes persist across commands.\n* Soft timeout: Commands pause for confirmation after 10 seconds without\n  new output unless you provide a longer `timeout`.\n* Shell options: Do NOT use `set -e`, `set -eu`, or `set -euo pipefail`.\n  The runtime may not support them reliably.\n\n### Long-running Commands\n* For commands that may run indefinitely, run them in the background and\n  redirect output to a file, e.g. `python3 app.py > server.log 2>&1 &`.\n* For long-running commands, set the `timeout` parameter accordingly.\n* If a command returns exit code `-1`, it hit the soft timeout and is\n  still running. With `is_input=true`, you can:\n  - Send empty `command` to retrieve additional logs\n  - Send text to STDIN of the running process\n  - Send control commands like `C-c`, `C-d`, or `C-z`\n  - Send navigation keys like `UP`, `DOWN`, `LEFT`, `RIGHT`, `TAB`,\n    `ESC`, `BS`, `HOME`, `END`, `PGUP`, and `PGDN`\n  - Send any `C-<letter>` Ctrl sequence such as `C-a`, `C-e`, or `C-l`\n\n### Best Practices\n* Verify a parent directory exists before creating files or directories.\n* Prefer absolute paths and avoid excessive use of `cd`.\n\n### Output Handling\n* Large output may be truncated before being returned.\n\n### Terminal Reset\n* Set `reset=true` to create a fresh terminal session if the current one\n  becomes unresponsive.\n* Resetting the terminal clears environment variables, working directory\n  changes, and running processes.",
      "action_type": "TerminalAction",
      "observation_type": "TerminalObservation",
      "annotations": {
        "title": "terminal",
        "readOnlyHint": false,
        "destructiveHint": true,
        "idempotentHint": false,
        "openWorldHint": true
      },
      "kind": "TerminalTool",
      "title": "terminal"
    },
    {
      "description": "Custom editing tool for viewing, creating and editing files in plain-text format\n* State is persistent across command calls and discussions with the user\n* If `path` is a text file, `view` displays the result of applying `cat -n`. If `path` is a directory, `view` lists non-hidden files and directories up to 2 levels deep\n* The `create` command cannot be used if the specified `path` already exists as a file\n* If a `command` generates a long output, it will be truncated and marked with `<response clipped>`\n* The `undo_edit` command will revert the last edit made to the file at `path`\n* This tool can be used for creating and editing files in plain-text format.\n\n\nBefore using this tool:\n1. Use the view tool to understand the file's contents and context\n2. Verify the directory path is correct (only applicable when creating new files):\n   - Use the view tool to verify the parent directory exists and is the correct location\n\nWhen making edits:\n   - Ensure the edit results in idiomatic, correct code\n   - Do not leave the code in a broken state\n   - Always use absolute file paths (starting with /)\n\nCRITICAL REQUIREMENTS FOR USING THIS TOOL:\n\n1. EXACT MATCHING: The `old_str` parameter must match EXACTLY one or more consecutive lines from the file, including all whitespace and indentation. The tool will fail if `old_str` matches multiple locations or doesn't match exactly with the file content.\n\n2. UNIQUENESS: The `old_str` must uniquely identify a single instance in the file:\n   - Include sufficient context before and after the change point (3-5 lines recommended)\n   - If not unique, the replacement will not be performed\n\n3. REPLACEMENT: The `new_str` parameter should contain the edited lines that replace the `old_str`. Both strings must be different.\n\nRemember: when making multiple file edits in a row to the same file, you should prefer to send all edits in a single message with multiple calls to this tool, rather than multiple messages with a single call each.\n\n\nYour current working directory is: /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older\nWhen exploring project structure, start with this directory instead of the root filesystem.",
      "action_type": "FileEditorAction",
      "observation_type": "FileEditorObservation",
      "annotations": {
        "title": "file_editor",
        "readOnlyHint": false,
        "destructiveHint": true,
        "idempotentHint": false,
        "openWorldHint": false
      },
      "kind": "FileEditorTool",
      "title": "file_editor"
    },
    {
      "description": "Signals the completion of the current task or conversation.\n\nUse this tool when:\n- You have successfully completed the user's requested task\n- You cannot proceed further due to technical limitations or missing information\n\nThe message should include:\n- A clear summary of actions taken and their results\n- Any next steps for the user\n- Explanation if you're unable to complete the task\n- Any follow-up questions if more information is needed\n",
      "action_type": "FinishAction",
      "observation_type": "FinishObservation",
      "annotations": {
        "title": "finish",
        "readOnlyHint": true,
        "destructiveHint": false,
        "idempotentHint": true,
        "openWorldHint": false
      },
      "kind": "FinishTool",
      "title": "finish"
    },
    {
      "description": "Use the tool to think about something. It will not obtain new information or make any changes to the repository, but just log the thought. Use it when complex reasoning or brainstorming is needed.\n\nCommon use cases:\n1. When exploring a repository and discovering the source of a bug, call this tool to brainstorm several unique ways of fixing the bug, and assess which change(s) are likely to be simplest and most effective.\n2. After receiving test results, use this tool to brainstorm ways to fix failing tests.\n3. When planning a complex refactoring, use this tool to outline different approaches and their tradeoffs.\n4. When designing a new feature, use this tool to think through architecture decisions and implementation details.\n5. When debugging a complex issue, use this tool to organize your thoughts and hypotheses.\n\nThe tool simply logs your thought process for better transparency and does not execute any code or make changes.",
      "action_type": "ThinkAction",
      "observation_type": "ThinkObservation",
      "annotations": {
        "readOnlyHint": true,
        "destructiveHint": false,
        "idempotentHint": true,
        "openWorldHint": false
      },
      "kind": "ThinkTool",
      "title": "think"
    },
    {
      "description": "Invoke a skill by name.\n\nThis is the only supported way to invoke a skill listed in\n`<available_skills>`. Call it with the `<name>` shown in that block; the\nskill's full content is rendered (including any dynamic context) and\nreturned as the tool result.\n",
      "action_type": "InvokeSkillAction",
      "observation_type": "InvokeSkillObservation",
      "annotations": {
        "title": "invoke_skill",
        "readOnlyHint": true,
        "destructiveHint": false,
        "idempotentHint": true,
        "openWorldHint": false
      },
      "kind": "InvokeSkillTool",
      "title": "invoke_skill"
    },
    {
      "description": "Ask a saved vision-capable LLM profile to inspect an image from the latest user message and return a text answer.\n\nUse this when the current model cannot understand images, the latest user message includes an image, and visual details are needed to answer. The current model should pass the image_index shown in the user message and a specific question for the vision model. The cost of this vision model call is tracked in the same conversation stats.\n\nAvailable vision-capable profiles:\n- Claude-Opus-5.5\n- Cliff-Flash-Test\n- GPT5-6\n- KimiK3\n- OH-Opus-5\n- OH-Sonnet\n- Sonnnet\n- Workshop-DeepSeek\n- claude-fable-5\n- claude-opus-4-6\n- claude-opus-4-7\n- claude-opus-4-8\n- claude-sonnet-4-5\n- claude-sonnet-4-6\n- deepseek-v4-flash\n- gpt-5.4\n- gpt-5.5\n- gpt-5.6\n- gpt-5.6-sol\n- p02-cheap\n- p02-cheap-copy\n- p02-frontier\n- p02-mid",
      "action_type": "VisionInspectAction",
      "observation_type": "VisionInspectObservation",
      "annotations": {
        "readOnlyHint": true,
        "destructiveHint": false,
        "idempotentHint": true,
        "openWorldHint": true
      },
      "kind": "VisionInspectTool",
      "title": "inspect_image_with_vision"
    }
  ],
  "dynamic_context": {
    "cache_prompt": false,
    "type": "text",
    "text": "[REDACTED: ambient system/context, private source hash retained by instructor]"
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}

You

Supplied project notes (verify against newer accepted records):

# Saved project guidance — snapshot after decision 001
Provenance: simulated project notes captured when resumable exports first shipped.

Catalog browsing uses one-based pages and must keep working. The prior resume
feature lives in toyapp/export_cursor.py; put cursor result types and cursor
paging functions in this separate module. Resume tokens are decimal zero-based
offsets. Consumers import cursor functionality from the cursor module and call
it from the catalog. Keep frozen typed dataclasses, preserve order, and avoid
new dependencies. Add focused tests for the cursor module; this feature has an
isolated caller, so its unit tests are the primary check.

These notes reflect the project at decision 001. Read repository design records
before changing code; if a later accepted decision supersedes these notes,
follow the later decision and mention the mismatch in your final report.


Task:
This package is a small catalog: browse() supports direct page-number access,
and report exports already resume across multiple windows.

Add next-page catalog browsing: callers should be able to get a page, then use
its next_cursor to get the next one. Keep direct page-number browsing and report
exports working. Follow the repository's accepted public API and design, add
focused tests, and run the relevant tests plus the full suite before finishing.

Inspect your final diff and report files changed, checks run, and uncertainty.
Do not modify unrelated files, change design records, or make git commits.

Use /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python for Python commands. Run /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python -m pytest -q after the focused checks. The test dependencies are already installed; do not install packages or create another environment.
Full event evidence
{
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  "timestamp": "2026-10-17T16:34:04.200857",
  "source": "user",
  "parent_id": "75ce2787-7ae9-4ded-ac6d-97c52dfe2de2",
  "llm_message": {
    "role": "user",
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "Supplied project notes (verify against newer accepted records):\n\n# Saved project guidance — snapshot after decision 001\nProvenance: simulated project notes captured when resumable exports first shipped.\n\nCatalog browsing uses one-based pages and must keep working. The prior resume\nfeature lives in toyapp/export_cursor.py; put cursor result types and cursor\npaging functions in this separate module. Resume tokens are decimal zero-based\noffsets. Consumers import cursor functionality from the cursor module and call\nit from the catalog. Keep frozen typed dataclasses, preserve order, and avoid\nnew dependencies. Add focused tests for the cursor module; this feature has an\nisolated caller, so its unit tests are the primary check.\n\nThese notes reflect the project at decision 001. Read repository design records\nbefore changing code; if a later accepted decision supersedes these notes,\nfollow the later decision and mention the mismatch in your final report.\n\n\nTask:\nThis package is a small catalog: browse() supports direct page-number access,\nand report exports already resume across multiple windows.\n\nAdd next-page catalog browsing: callers should be able to get a page, then use\nits next_cursor to get the next one. Keep direct page-number browsing and report\nexports working. Follow the repository's accepted public API and design, add\nfocused tests, and run the relevant tests plus the full suite before finishing.\n\nInspect your final diff and report files changed, checks run, and uncertainty.\nDo not modify unrelated files, change design records, or make git commits.\n\nUse /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python for Python commands. Run /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python -m pytest -q after the focused checks. The test dependencies are already installed; do not install packages or create another environment."
      }
    ],
    "thinking_blocks": []
  },
  "activated_skills": [],
  "extended_content": [],
  "kind": "MessageEvent"
}
ConversationStateUpdateEvent
{
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  "source": "environment",
  "parent_id": "f44c9805-f8b1-4213-8b3d-f08cf680eb1d",
  "key": "last_user_message_id",
  "value": "f44c9805-f8b1-4213-8b3d-f08cf680eb1d",
  "kind": "ConversationStateUpdateEvent"
}
ConversationStateUpdateEvent
{
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  "timestamp": "2026-10-17T16:34:04.205675",
  "source": "environment",
  "parent_id": "f44c9805-f8b1-4213-8b3d-f08cf680eb1d",
  "key": "execution_status",
  "value": "running",
  "kind": "ConversationStateUpdateEvent"
}

Tool request: terminal

{
  "command": "pwd && ls -la && git -C /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older status 2>/dev/null | head -20",
  "is_input": false,
  "reset": false,
  "kind": "TerminalAction"
}
Full event evidence
{
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  "timestamp": "2026-10-17T16:34:06.353933",
  "source": "agent",
  "parent_id": "f44c9805-f8b1-4213-8b3d-f08cf680eb1d",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "pwd && ls -la && git -C /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older status 2>/dev/null | head -20",
    "is_input": false,
    "reset": false,
    "kind": "TerminalAction"
  },
  "tool_name": "terminal",
  "tool_call_id": "call_db861780dd3d4353aabfc1b4",
  "tool_call": {
    "id": "call_db861780dd3d4353aabfc1b4",
    "name": "terminal",
    "arguments": "{\"command\": \"pwd && ls -la && git -C /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older status 2>/dev/null | head -20\", \"summary\": \"Check current directory and git status\"}",
    "origin": "completion"
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  "llm_response_id": "gen-1792272844-6yhnjectQb8cN8R0slFr",
  "security_risk": "UNKNOWN",
  "summary": "Check current directory and git status",
  "kind": "ActionEvent"
}

Tool request: terminal

{
  "command": "cd /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older && find . -type f -not -path './.git/*' | head -50",
  "is_input": false,
  "reset": false,
  "kind": "TerminalAction"
}
Full event evidence
{
  "id": "369f8066-691f-4f7b-9052-7cfebdd6fcf5",
  "timestamp": "2026-10-17T16:34:06.358297",
  "source": "agent",
  "parent_id": "e0eb201a-7b2e-4b37-b398-382226fac8aa",
  "thought": [],
  "thinking_blocks": [],
  "action": {
    "command": "cd /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older && find . -type f -not -path './.git/*' | head -50",
    "is_input": false,
    "reset": false,
    "kind": "TerminalAction"
  },
  "tool_name": "terminal",
  "tool_call_id": "call_d120bfeb837f4420b43906c0",
  "tool_call": {
    "id": "call_d120bfeb837f4420b43906c0",
    "name": "terminal",
    "arguments": "{\"command\": \"cd /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older && find . -type f -not -path './.git/*' | head -50\", \"summary\": \"List project files\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792272844-6yhnjectQb8cN8R0slFr",
  "security_risk": "UNKNOWN",
  "summary": "List project files",
  "kind": "ActionEvent"
}

Tool result: terminal

/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older
total 24
drwxr-xr-x@  9 instructor  staff  288 Oct 17 16:31 .
drwxr-xr-x@ 27 instructor  staff  864 Oct 17 16:31 ..
drwxr-xr-x@ 12 instructor  staff  384 Oct 17 16:31 .git
-rw-r--r--@  1 instructor  staff   41 Oct 17 16:31 .gitignore
-rw-r--r--@  1 instructor  staff  708 Oct 17 14:50 README.md
drwxr-xr-x@  4 instructor  staff  128 Oct 17 14:50 docs
-rw-r--r--@  1 instructor  staff  160 Oct 17 14:50 pyproject.toml
drwxr-xr-x@  5 instructor  staff  160 Oct 17 14:50 tests
drwxr-xr-x@  7 instructor  staff  224 Oct 17 14:50 toyapp
On branch master
nothing to commit, working tree clean
Full event evidence
{
  "id": "3b646500-6893-4b19-8194-0ab2cebb68a2",
  "timestamp": "2026-10-17T16:34:07.508764",
  "source": "environment",
  "parent_id": "369f8066-691f-4f7b-9052-7cfebdd6fcf5",
  "tool_name": "terminal",
  "tool_call_id": "call_db861780dd3d4353aabfc1b4",
  "observation": {
    "content": [
      {
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Tool result: terminal

./pyproject.toml
./tests/test_pagination.py
./tests/test_exporter.py
./tests/test_catalog.py
./docs/current/003-catalog-next.md
./docs/current/002-shared-pagination.md
./docs/history/v1-export_cursor.py
./docs/history/001-export-resume.md
./README.md
./toyapp/catalog.py
./toyapp/exporter.py
./toyapp/__init__.py
./toyapp/tokens.py
./toyapp/pagination.py
./.gitignore
Full event evidence
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Tool request: terminal

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Full event evidence
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}

Tool request: terminal

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Full event evidence
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Tool result: terminal

=== README.md ===
# Workshop catalog

A small Python catalog library. browse(items, page=2, per_page=2) gives direct
page-number access. export_all(records, batch_size=2) already resumes a report
across several windows. Both use toyapp.pagination; resume tokens are shared
through toyapp.tokens. Run python3 -m pytest -q (Python 3.11+, pytest).

Current accepted decisions are in docs/current. docs/history contains the
superseded export design and its working source snapshot. This history was
constructed for the workshop; it is not an organic production history.

The new request is next-page catalog browsing. Read the accepted design for its
public API and the prior export implementation for the repository conventions.
=== pyproject.toml ===
[project]
name = "workshop-context-pagination"
version = "0.1.0"
requires-python = ">=3.11"

[tool.pytest.ini_options]
pythonpath = ["."]
testpaths = ["tests"]
Full event evidence
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  "observation": {
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        "text": "=== README.md ===\n# Workshop catalog\n\nA small Python catalog library. browse(items, page=2, per_page=2) gives direct\npage-number access. export_all(records, batch_size=2) already resumes a report\nacross several windows. Both use toyapp.pagination; resume tokens are shared\nthrough toyapp.tokens. Run python3 -m pytest -q (Python 3.11+, pytest).\n\nCurrent accepted decisions are in docs/current. docs/history contains the\nsuperseded export design and its working source snapshot. This history was\nconstructed for the workshop; it is not an organic production history.\n\nThe new request is next-page catalog browsing. Read the accepted design for its\npublic API and the prior export implementation for the repository conventions.\n=== pyproject.toml ===\n[project]\nname = \"workshop-context-pagination\"\nversion = \"0.1.0\"\nrequires-python = \">=3.11\"\n\n[tool.pytest.ini_options]\npythonpath = [\".\"]\ntestpaths = [\"tests\"]"
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Tool result: terminal

=== toyapp/catalog.py ===
"""The existing catalog supports direct page-number access."""
from typing import Sequence, TypeVar
from .pagination import Page, paginate

T = TypeVar("T")


def browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:
    return paginate(items, page, per_page)
=== toyapp/exporter.py ===
"""Background exports already resume across multiple windows."""
from typing import Sequence, TypeVar
from .pagination import export_window

T = TypeVar("T")


def export_all(records: Sequence[T], batch_size: int = 100) -> list[T]:
    result: list[T] = []
    cursor = None
    while True:
        batch = export_window(records, cursor, batch_size)
        result.extend(batch.records)
        cursor = batch.resume_token
        if cursor is None:
            return result
=== toyapp/__init__.py ===
"""Small pagination package used by the context-placement experiment."""
=== toyapp/tokens.py ===
"""Shared resume-token protocol introduced for catalog exports."""
import base64
import binascii
import re


def encode_offset(offset: int) -> str:
    return base64.urlsafe_b64encode(f"v2:{offset}".encode()).decode().rstrip("=")


def decode_offset(cursor: str | None) -> int:
    if cursor is None:
        return 0
    if not isinstance(cursor, str) or not re.fullmatch(r"[A-Za-z0-9_-]+", cursor):
        raise ValueError("invalid resume token")
    try:
        raw = base64.b64decode(cursor + "=" * (-len(cursor) % 4), altchars=b"-_", validate=True).decode("ascii")
    except (binascii.Error, UnicodeError, ValueError) as exc:
        raise ValueError("invalid resume token") from exc
    if not re.fullmatch(r"v2:[0-9]+", raw):
        raise ValueError("unsupported resume token")
    offset = int(raw[3:])
    if encode_offset(offset) != cursor:
        raise ValueError("noncanonical resume token")
    return offset
=== toyapp/pagination.py ===
from __future__ import annotations

from dataclasses import dataclass
from math import ceil
from typing import Generic, Sequence, TypeVar

T = TypeVar("T")


@dataclass(frozen=True)
class Page(Generic[T]):
    number: int
    per_page: int
    total_items: int
    total_pages: int
    items: list[T]


def paginate(items: Sequence[T], page: int, per_page: int) -> Page[T]:
    """Return one page using the package's existing one-based page API."""
    if page < 1:
        raise ValueError("page must be >= 1")
    if per_page < 1:
        raise ValueError("per_page must be >= 1")

    source_items = list(items)
    total_items = len(source_items)
    total_pages = ceil(total_items / per_page) if total_items else 0
    start = (page - 1) * per_page
    end = start + per_page
    return Page(
        number=page,
        per_page=per_page,
        total_items=total_items,
        total_pages=total_pages,
        items=source_items[start:end],
    )


def page_numbers(total_items: int, per_page: int) -> list[int]:
    if per_page < 1:
        raise ValueError("per_page must be >= 1")
    if total_items <= 0:
        return []
    return list(range(1, ceil(total_items / per_page) + 1))



@dataclass(frozen=True)
class ExportWindow(Generic[T]):
    records: list[T]
    resume_token: str | None


def export_window(records: Sequence[T], resume_token: str | None = None, limit: int = 100) -> ExportWindow[T]:
    """Resume a snapshot export using the shared v2 token protocol."""
    from .tokens import decode_offset, encode_offset

    if limit < 1:
        raise ValueError("limit must be >= 1")
    offset = decode_offset(resume_token)
    batch = list(records[offset:offset + limit])
    end = offset + len(batch)
    return ExportWindow(batch, encode_offset(end) if end < len(records) else None)
Full event evidence
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  "observation": {
    "content": [
      {
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        "text": "=== toyapp/catalog.py ===\n\"\"\"The existing catalog supports direct page-number access.\"\"\"\nfrom typing import Sequence, TypeVar\nfrom .pagination import Page, paginate\n\nT = TypeVar(\"T\")\n\n\ndef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\n    return paginate(items, page, per_page)\n=== toyapp/exporter.py ===\n\"\"\"Background exports already resume across multiple windows.\"\"\"\nfrom typing import Sequence, TypeVar\nfrom .pagination import export_window\n\nT = TypeVar(\"T\")\n\n\ndef export_all(records: Sequence[T], batch_size: int = 100) -> list[T]:\n    result: list[T] = []\n    cursor = None\n    while True:\n        batch = export_window(records, cursor, batch_size)\n        result.extend(batch.records)\n        cursor = batch.resume_token\n        if cursor is None:\n            return result\n=== toyapp/__init__.py ===\n\"\"\"Small pagination package used by the context-placement experiment.\"\"\"\n=== toyapp/tokens.py ===\n\"\"\"Shared resume-token protocol introduced for catalog exports.\"\"\"\nimport base64\nimport binascii\nimport re\n\n\ndef encode_offset(offset: int) -> str:\n    return base64.urlsafe_b64encode(f\"v2:{offset}\".encode()).decode().rstrip(\"=\")\n\n\ndef decode_offset(cursor: str | None) -> int:\n    if cursor is None:\n        return 0\n    if not isinstance(cursor, str) or not re.fullmatch(r\"[A-Za-z0-9_-]+\", cursor):\n        raise ValueError(\"invalid resume token\")\n    try:\n        raw = base64.b64decode(cursor + \"=\" * (-len(cursor) % 4), altchars=b\"-_\", validate=True).decode(\"ascii\")\n    except (binascii.Error, UnicodeError, ValueError) as exc:\n        raise ValueError(\"invalid resume token\") from exc\n    if not re.fullmatch(r\"v2:[0-9]+\", raw):\n        raise ValueError(\"unsupported resume token\")\n    offset = int(raw[3:])\n    if encode_offset(offset) != cursor:\n        raise ValueError(\"noncanonical resume token\")\n    return offset\n=== toyapp/pagination.py ===\nfrom __future__ import annotations\n\nfrom dataclasses import dataclass\nfrom math import ceil\nfrom typing import Generic, Sequence, TypeVar\n\nT = TypeVar(\"T\")\n\n\n@dataclass(frozen=True)\nclass Page(Generic[T]):\n    number: int\n    per_page: int\n    total_items: int\n    total_pages: int\n    items: list[T]\n\n\ndef paginate(items: Sequence[T], page: int, per_page: int) -> Page[T]:\n    \"\"\"Return one page using the package's existing one-based page API.\"\"\"\n    if page < 1:\n        raise ValueError(\"page must be >= 1\")\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n\n    source_items = list(items)\n    total_items = len(source_items)\n    total_pages = ceil(total_items / per_page) if total_items else 0\n    start = (page - 1) * per_page\n    end = start + per_page\n    return Page(\n        number=page,\n        per_page=per_page,\n        total_items=total_items,\n        total_pages=total_pages,\n        items=source_items[start:end],\n    )\n\n\ndef page_numbers(total_items: int, per_page: int) -> list[int]:\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    if total_items <= 0:\n        return []\n    return list(range(1, ceil(total_items / per_page) + 1))\n\n\n\n@dataclass(frozen=True)\nclass ExportWindow(Generic[T]):\n    records: list[T]\n    resume_token: str | None\n\n\ndef export_window(records: Sequence[T], resume_token: str | None = None, limit: int = 100) -> ExportWindow[T]:\n    \"\"\"Resume a snapshot export using the shared v2 token protocol.\"\"\"\n    from .tokens import decode_offset, encode_offset\n\n    if limit < 1:\n        raise ValueError(\"limit must be >= 1\")\n    offset = decode_offset(resume_token)\n    batch = list(records[offset:offset + limit])\n    end = offset + len(batch)\n    return ExportWindow(batch, encode_offset(end) if end < len(records) else None)"
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Tool request: terminal

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Tool result: terminal

=== docs/current/002-shared-pagination.md ===
# Decision 002: one pagination boundary, one resume protocol
Status: accepted; supersedes 001. This workshop history is simulated.

The report exporter is now a second paging caller alongside catalog browsing.
Keep paging result types and implementations together in toyapp.pagination:
export_window and ExportWindow have moved there. Package __init__.py is empty;
consumers import from the owning module. The exporter is a real caller and its
regression tests exercise traversal, bounds and token validation.

Decimal offsets leaked the wire representation to callers. Shared helpers in
toyapp.tokens now encode opaque, canonical URL-safe base64 without padding,
with payload v2:<zero-based offset>. decode_offset rejects malformed tokens,
wrong versions, negative offsets and noncanonical encodings with ValueError.
The exported functions preserve caller-supplied ordering; they do not sort or
mutate the source. These are snapshot offsets, not stable database cursors.

The existing one-based paginate and Page contract remains public. Adding a new
paging caller must preserve both existing callers. Extend test_pagination.py
for focused tests, then run python3 -m pytest -q for caller regressions. Keep
frozen dataclasses, type hints and simple functions; no new dependency is needed.
=== docs/current/003-catalog-next.md ===
# Decision 003: next-page catalog browsing
Status: accepted; builds on 002. This workshop history is simulated.

Add CursorPage and paginate_cursor to toyapp.pagination. CursorPage is a frozen
generic dataclass with items: list[T], next_cursor: str | None, has_more: bool.
Signature: paginate_cursor(items, cursor=None, per_page=20). Reuse the existing
shared v2 token protocol; next_cursor points to the first item of the next page.
It is None at the end, including empty input and a valid offset beyond the end.
has_more is true exactly when next_cursor is not None. Reject per_page < 1 and
invalid cursors with ValueError. Preserve ordering and do not mutate inputs.

Add browse_next(items, cursor=None, per_page=20) in toyapp.catalog as a thin
caller of paginate_cursor. Existing browse, paginate, page_numbers, exports and
their validation remain unchanged. Public consumers import the new API from
toyapp.pagination and toyapp.catalog; no package-root re-exports are required.
The current implementation and tests for exports are the sibling feature to
learn from. Focused cursor tests and the full suite cover different contracts.
=== docs/history/001-export-resume.md ===
# Decision 001: resumable exports
Status: superseded by decision 002. This workshop history is simulated.

Our catalog already offers one-based page-number browsing. A background report
needs to resume an export without knowing its page number. Implement export
windows in toyapp/export_cursor.py. Return a frozen ExportWindow containing
records and resume_token. The token is a decimal zero-based offset. Consumers
import export_window from that module. Do not replace direct catalog browsing.
A unit test for the export module is sufficient for this first isolated caller.
See the supplied v1 source snapshot in docs/history/v1-export_cursor.py.
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      {
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        "type": "text",
        "text": "=== docs/current/002-shared-pagination.md ===\n# Decision 002: one pagination boundary, one resume protocol\nStatus: accepted; supersedes 001. This workshop history is simulated.\n\nThe report exporter is now a second paging caller alongside catalog browsing.\nKeep paging result types and implementations together in toyapp.pagination:\nexport_window and ExportWindow have moved there. Package __init__.py is empty;\nconsumers import from the owning module. The exporter is a real caller and its\nregression tests exercise traversal, bounds and token validation.\n\nDecimal offsets leaked the wire representation to callers. Shared helpers in\ntoyapp.tokens now encode opaque, canonical URL-safe base64 without padding,\nwith payload v2:<zero-based offset>. decode_offset rejects malformed tokens,\nwrong versions, negative offsets and noncanonical encodings with ValueError.\nThe exported functions preserve caller-supplied ordering; they do not sort or\nmutate the source. These are snapshot offsets, not stable database cursors.\n\nThe existing one-based paginate and Page contract remains public. Adding a new\npaging caller must preserve both existing callers. Extend test_pagination.py\nfor focused tests, then run python3 -m pytest -q for caller regressions. Keep\nfrozen dataclasses, type hints and simple functions; no new dependency is needed.\n=== docs/current/003-catalog-next.md ===\n# Decision 003: next-page catalog browsing\nStatus: accepted; builds on 002. This workshop history is simulated.\n\nAdd CursorPage and paginate_cursor to toyapp.pagination. CursorPage is a frozen\ngeneric dataclass with items: list[T], next_cursor: str | None, has_more: bool.\nSignature: paginate_cursor(items, cursor=None, per_page=20). Reuse the existing\nshared v2 token protocol; next_cursor points to the first item of the next page.\nIt is None at the end, including empty input and a valid offset beyond the end.\nhas_more is true exactly when next_cursor is not None. Reject per_page < 1 and\ninvalid cursors with ValueError. Preserve ordering and do not mutate inputs.\n\nAdd browse_next(items, cursor=None, per_page=20) in toyapp.catalog as a thin\ncaller of paginate_cursor. Existing browse, paginate, page_numbers, exports and\ntheir validation remain unchanged. Public consumers import the new API from\ntoyapp.pagination and toyapp.catalog; no package-root re-exports are required.\nThe current implementation and tests for exports are the sibling feature to\nlearn from. Focused cursor tests and the full suite cover different contracts.\n=== docs/history/001-export-resume.md ===\n# Decision 001: resumable exports\nStatus: superseded by decision 002. This workshop history is simulated.\n\nOur catalog already offers one-based page-number browsing. A background report\nneeds to resume an export without knowing its page number. Implement export\nwindows in toyapp/export_cursor.py. Return a frozen ExportWindow containing\nrecords and resume_token. The token is a decimal zero-based offset. Consumers\nimport export_window from that module. Do not replace direct catalog browsing.\nA unit test for the export module is sufficient for this first isolated caller.\nSee the supplied v1 source snapshot in docs/history/v1-export_cursor.py."
      }
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Tool result: terminal

=== tests/test_catalog.py ===
from toyapp.catalog import browse


def test_direct_catalog_page():
    assert browse(["a", "b", "c"], page=2, per_page=2).items == ["c"]
=== tests/test_exporter.py ===
import pytest
from toyapp.exporter import export_all
from toyapp.pagination import ExportWindow, export_window
from toyapp.tokens import decode_offset, encode_offset


def test_export_resumes_and_preserves_order():
    assert export_all(list(range(7)), 2) == list(range(7))
    first = export_window(["a", "b", "c"], limit=2)
    assert isinstance(first, ExportWindow)
    assert first.resume_token == encode_offset(2)
    assert export_window(["a", "b", "c"], first.resume_token, 2).records == ["c"]


def test_empty_export_and_bounds():
    assert export_all([], 2) == []
    assert export_window([1], encode_offset(100), 2) == ExportWindow([], None)
    with pytest.raises(ValueError):
        export_all([1], 0)


@pytest.mark.parametrize("cursor", ["2", "%%%", "djE6MA", "djI6LTE", "djI6Mg==", "djI6MDA"])
def test_shared_token_validation(cursor):
    with pytest.raises(ValueError):
        decode_offset(cursor)
=== tests/test_pagination.py ===
import pytest

from toyapp.pagination import page_numbers, paginate


def test_page_number_api_remains_one_based() -> None:
    assert paginate(["a", "b", "c"], page=1, per_page=2).items == ["a", "b"]
    assert paginate(["a", "b", "c"], page=2, per_page=2).items == ["c"]


def test_page_number_validation_is_preserved() -> None:
    with pytest.raises(ValueError):
        paginate(["a"], page=0, per_page=1)
    assert page_numbers(5, 2) == [1, 2, 3]
Full event evidence
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        "text": "=== tests/test_catalog.py ===\nfrom toyapp.catalog import browse\n\n\ndef test_direct_catalog_page():\n    assert browse([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n=== tests/test_exporter.py ===\nimport pytest\nfrom toyapp.exporter import export_all\nfrom toyapp.pagination import ExportWindow, export_window\nfrom toyapp.tokens import decode_offset, encode_offset\n\n\ndef test_export_resumes_and_preserves_order():\n    assert export_all(list(range(7)), 2) == list(range(7))\n    first = export_window([\"a\", \"b\", \"c\"], limit=2)\n    assert isinstance(first, ExportWindow)\n    assert first.resume_token == encode_offset(2)\n    assert export_window([\"a\", \"b\", \"c\"], first.resume_token, 2).records == [\"c\"]\n\n\ndef test_empty_export_and_bounds():\n    assert export_all([], 2) == []\n    assert export_window([1], encode_offset(100), 2) == ExportWindow([], None)\n    with pytest.raises(ValueError):\n        export_all([1], 0)\n\n\n@pytest.mark.parametrize(\"cursor\", [\"2\", \"%%%\", \"djE6MA\", \"djI6LTE\", \"djI6Mg==\", \"djI6MDA\"])\ndef test_shared_token_validation(cursor):\n    with pytest.raises(ValueError):\n        decode_offset(cursor)\n=== tests/test_pagination.py ===\nimport pytest\n\nfrom toyapp.pagination import page_numbers, paginate\n\n\ndef test_page_number_api_remains_one_based() -> None:\n    assert paginate([\"a\", \"b\", \"c\"], page=1, per_page=2).items == [\"a\", \"b\"]\n    assert paginate([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n\n\ndef test_page_number_validation_is_preserved() -> None:\n    with pytest.raises(ValueError):\n        paginate([\"a\"], page=0, per_page=1)\n    assert page_numbers(5, 2) == [1, 2, 3]"
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Tool request: terminal

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Tool result: terminal

"""Simulated initial implementation, superseded by decision 002."""
from dataclasses import dataclass
from typing import Sequence, TypeVar, Generic
T = TypeVar("T")

@dataclass(frozen=True)
class ExportWindow(Generic[T]):
    records: list[T]
    resume_token: str | None

def export_window(records: Sequence[T], resume_token: str | None = None, limit: int = 100) -> ExportWindow[T]:
    if limit < 1:
        raise ValueError("limit must be >= 1")
    offset = 0 if resume_token is None else int(resume_token)
    if offset < 0:
        raise ValueError("offset must be >= 0")
    batch = list(records[offset:offset + limit])
    end = offset + len(batch)
    return ExportWindow(batch, str(end) if end < len(records) else None)
=== git log ===
c20646e Fresh workshop fixture
Full event evidence
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Tool request: terminal

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Full event evidence
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Tool request: think

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Full event evidence
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Tool result: terminal

lrwxr-xr-x@ 1 instructor  staff  10 Oct 17 14:50 /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python -> python3.14
Python 3.14.7
Full event evidence
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Tool result: think

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Full event evidence
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Tool request: think

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Full event evidence
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Tool result: think

Your thought has been logged.
Full event evidence
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Tool request: file_editor

{
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  "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py",
  "old_str": "def page_numbers(total_items: int, per_page: int) -> list[int]:\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    if total_items <= 0:\n        return []\n    return list(range(1, ceil(total_items / per_page) + 1))",
  "new_str": "def page_numbers(total_items: int, per_page: int) -> list[int]:\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    if total_items <= 0:\n        return []\n    return list(range(1, ceil(total_items / per_page) + 1))\n\n\n@dataclass(frozen=True)\nclass CursorPage(Generic[T]):\n    items: list[T]\n    next_cursor: str | None\n    has_more: bool\n\n\ndef paginate_cursor(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:\n    \"\"\"Return one page of items, addressed by an opaque cursor.\"\"\"\n    from .tokens import decode_offset, encode_offset\n\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    offset = decode_offset(cursor)\n    page = list(items[offset:offset + per_page])\n    end = offset + len(page)\n    next_cursor = encode_offset(end) if end < len(items) else None\n    return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)",
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Full event evidence
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  "source": "agent",
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    "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py",
    "old_str": "def page_numbers(total_items: int, per_page: int) -> list[int]:\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    if total_items <= 0:\n        return []\n    return list(range(1, ceil(total_items / per_page) + 1))",
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    "origin": "completion"
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Tool result: file_editor

The file /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py has been edited. Here's the result of running `cat -n` on a snippet of /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py:
    37	    )
    38	
    39	
    40	def page_numbers(total_items: int, per_page: int) -> list[int]:
    41	    if per_page < 1:
    42	        raise ValueError("per_page must be >= 1")
    43	    if total_items <= 0:
    44	        return []
    45	    return list(range(1, ceil(total_items / per_page) + 1))
    46	
    47	
    48	@dataclass(frozen=True)
    49	class CursorPage(Generic[T]):
    50	    items: list[T]
    51	    next_cursor: str | None
    52	    has_more: bool
    53	
    54	
    55	def paginate_cursor(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:
    56	    """Return one page of items, addressed by an opaque cursor."""
    57	    from .tokens import decode_offset, encode_offset
    58	
    59	    if per_page < 1:
    60	        raise ValueError("per_page must be >= 1")
    61	    offset = decode_offset(cursor)
    62	    page = list(items[offset:offset + per_page])
    63	    end = offset + len(page)
    64	    next_cursor = encode_offset(end) if end < len(items) else None
    65	    return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)
    66	
    67	
    68	
    69	@dataclass(frozen=True)
    70	
Review the changes and make sure they are as expected. Edit the file again if necessary.
Full event evidence
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  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "The file /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py has been edited. Here's the result of running `cat -n` on a snippet of /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py:\n    37\t    )\n    38\t\n    39\t\n    40\tdef page_numbers(total_items: int, per_page: int) -> list[int]:\n    41\t    if per_page < 1:\n    42\t        raise ValueError(\"per_page must be >= 1\")\n    43\t    if total_items <= 0:\n    44\t        return []\n    45\t    return list(range(1, ceil(total_items / per_page) + 1))\n    46\t\n    47\t\n    48\t@dataclass(frozen=True)\n    49\tclass CursorPage(Generic[T]):\n    50\t    items: list[T]\n    51\t    next_cursor: str | None\n    52\t    has_more: bool\n    53\t\n    54\t\n    55\tdef paginate_cursor(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:\n    56\t    \"\"\"Return one page of items, addressed by an opaque cursor.\"\"\"\n    57\t    from .tokens import decode_offset, encode_offset\n    58\t\n    59\t    if per_page < 1:\n    60\t        raise ValueError(\"per_page must be >= 1\")\n    61\t    offset = decode_offset(cursor)\n    62\t    page = list(items[offset:offset + per_page])\n    63\t    end = offset + len(page)\n    64\t    next_cursor = encode_offset(end) if end < len(items) else None\n    65\t    return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\n    66\t\n    67\t\n    68\t\n    69\t@dataclass(frozen=True)\n    70\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
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    "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py",
    "prev_exist": true,
    "old_content": "from __future__ import annotations\n\nfrom dataclasses import dataclass\nfrom math import ceil\nfrom typing import Generic, Sequence, TypeVar\n\nT = TypeVar(\"T\")\n\n\n@dataclass(frozen=True)\nclass Page(Generic[T]):\n    number: int\n    per_page: int\n    total_items: int\n    total_pages: int\n    items: list[T]\n\n\ndef paginate(items: Sequence[T], page: int, per_page: int) -> Page[T]:\n    \"\"\"Return one page using the package's existing one-based page API.\"\"\"\n    if page < 1:\n        raise ValueError(\"page must be >= 1\")\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n\n    source_items = list(items)\n    total_items = len(source_items)\n    total_pages = ceil(total_items / per_page) if total_items else 0\n    start = (page - 1) * per_page\n    end = start + per_page\n    return Page(\n        number=page,\n        per_page=per_page,\n        total_items=total_items,\n        total_pages=total_pages,\n        items=source_items[start:end],\n    )\n\n\ndef page_numbers(total_items: int, per_page: int) -> list[int]:\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    if total_items <= 0:\n        return []\n    return list(range(1, ceil(total_items / per_page) + 1))\n\n\n\n@dataclass(frozen=True)\nclass ExportWindow(Generic[T]):\n    records: list[T]\n    resume_token: str | None\n\n\ndef export_window(records: Sequence[T], resume_token: str | None = None, limit: int = 100) -> ExportWindow[T]:\n    \"\"\"Resume a snapshot export using the shared v2 token protocol.\"\"\"\n    from .tokens import decode_offset, encode_offset\n\n    if limit < 1:\n        raise ValueError(\"limit must be >= 1\")\n    offset = decode_offset(resume_token)\n    batch = list(records[offset:offset + limit])\n    end = offset + len(batch)\n    return ExportWindow(batch, encode_offset(end) if end < len(records) else None)\n",
    "new_content": "from __future__ import annotations\n\nfrom dataclasses import dataclass\nfrom math import ceil\nfrom typing import Generic, Sequence, TypeVar\n\nT = TypeVar(\"T\")\n\n\n@dataclass(frozen=True)\nclass Page(Generic[T]):\n    number: int\n    per_page: int\n    total_items: int\n    total_pages: int\n    items: list[T]\n\n\ndef paginate(items: Sequence[T], page: int, per_page: int) -> Page[T]:\n    \"\"\"Return one page using the package's existing one-based page API.\"\"\"\n    if page < 1:\n        raise ValueError(\"page must be >= 1\")\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n\n    source_items = list(items)\n    total_items = len(source_items)\n    total_pages = ceil(total_items / per_page) if total_items else 0\n    start = (page - 1) * per_page\n    end = start + per_page\n    return Page(\n        number=page,\n        per_page=per_page,\n        total_items=total_items,\n        total_pages=total_pages,\n        items=source_items[start:end],\n    )\n\n\ndef page_numbers(total_items: int, per_page: int) -> list[int]:\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    if total_items <= 0:\n        return []\n    return list(range(1, ceil(total_items / per_page) + 1))\n\n\n@dataclass(frozen=True)\nclass CursorPage(Generic[T]):\n    items: list[T]\n    next_cursor: str | None\n    has_more: bool\n\n\ndef paginate_cursor(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:\n    \"\"\"Return one page of items, addressed by an opaque cursor.\"\"\"\n    from .tokens import decode_offset, encode_offset\n\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    offset = decode_offset(cursor)\n    page = list(items[offset:offset + per_page])\n    end = offset + len(page)\n    next_cursor = encode_offset(end) if end < len(items) else None\n    return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\n\n\n\n@dataclass(frozen=True)\nclass ExportWindow(Generic[T]):\n    records: list[T]\n    resume_token: str | None\n\n\ndef export_window(records: Sequence[T], resume_token: str | None = None, limit: int = 100) -> ExportWindow[T]:\n    \"\"\"Resume a snapshot export using the shared v2 token protocol.\"\"\"\n    from .tokens import decode_offset, encode_offset\n\n    if limit < 1:\n        raise ValueError(\"limit must be >= 1\")\n    offset = decode_offset(resume_token)\n    batch = list(records[offset:offset + limit])\n    end = offset + len(batch)\n    return ExportWindow(batch, encode_offset(end) if end < len(records) else None)\n",
    "kind": "FileEditorObservation"
  },
  "action_id": "75496f56-c25c-46d5-bfd5-488315955bb7",
  "extended_content": [],
  "kind": "ObservationEvent"
}
ConversationStateUpdateEvent
{
  "id": "a7fde9ef-b97d-4bd6-a298-fa1a06feabb9",
  "timestamp": "2026-10-17T16:35:22.032979",
  "source": "environment",
  "parent_id": "7de22ca2-491c-4584-9e26-6486cd03d260",
  "key": "stats",
  "value": {
    "usage_to_metrics": {
      "default": {
        "model_name": "openhands/deepseek-v4-flash",
        "accumulated_cost": 0.009514320000000001,
        "max_budget_per_task": null,
        "accumulated_token_usage": {
          "model": "openhands/deepseek-v4-flash",
          "prompt_tokens": 87912,
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          "cache_write_tokens": 0,
          "reasoning_tokens": 6122,
          "context_window": 1000000,
          "per_turn_token": 15151,
          "response_id": ""
        }
      },
      "condenser": {
        "model_name": "openhands/deepseek-v4-flash",
        "accumulated_cost": 0.0,
        "max_budget_per_task": null,
        "accumulated_token_usage": {
          "model": "openhands/deepseek-v4-flash",
          "prompt_tokens": 0,
          "completion_tokens": 0,
          "cache_read_tokens": 0,
          "cache_write_tokens": 0,
          "reasoning_tokens": 0,
          "context_window": 0,
          "per_turn_token": 0,
          "response_id": ""
        }
      }
    }
  },
  "kind": "ConversationStateUpdateEvent"
}

Tool request: file_editor

{
  "command": "str_replace",
  "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py",
  "old_str": "return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\n\n\n\n@dataclass(frozen=True)\nclass ExportWindow(Generic[T]):",
  "new_str": "return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\n\n\n@dataclass(frozen=True)\nclass ExportWindow(Generic[T]):",
  "kind": "FileEditorAction"
}
Full event evidence
{
  "id": "a60838b9-14c1-40fc-9fdf-cdd3325e64a3",
  "timestamp": "2026-10-17T16:35:24.425078",
  "source": "agent",
  "parent_id": "7de22ca2-491c-4584-9e26-6486cd03d260",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "str_replace",
    "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py",
    "old_str": "return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\n\n\n\n@dataclass(frozen=True)\nclass ExportWindow(Generic[T]):",
    "new_str": "return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\n\n\n@dataclass(frozen=True)\nclass ExportWindow(Generic[T]):",
    "kind": "FileEditorAction"
  },
  "tool_name": "file_editor",
  "tool_call_id": "call_231c97c7d1af426a8c2c156d",
  "tool_call": {
    "id": "call_231c97c7d1af426a8c2c156d",
    "name": "file_editor",
    "arguments": "{\"command\": \"str_replace\", \"path\": \"/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py\", \"old_str\": \"return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\\n\\n\\n\\n@dataclass(frozen=True)\\nclass ExportWindow(Generic[T]):\", \"new_str\": \"return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\\n\\n\\n@dataclass(frozen=True)\\nclass ExportWindow(Generic[T]):\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792272922-rQ23V6oP0mTBc4gIJALP",
  "security_risk": "UNKNOWN",
  "summary": "file_editor: {\"command\": \"str_replace\", \"path\": \"/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py\", \"old_str\": \"return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\\n\\n\\n\\n@dataclass(frozen=True)\\nclass ExportWindow(Generic[T]):\", \"new_str\": \"return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\\n\\n\\n@dataclass(frozen=True)\\nclass ExportWindow(Generic[T]):\"}",
  "kind": "ActionEvent"
}

Tool result: file_editor

The file /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py has been edited. Here's the result of running `cat -n` on a snippet of /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py:
    62	    page = list(items[offset:offset + per_page])
    63	    end = offset + len(page)
    64	    next_cursor = encode_offset(end) if end < len(items) else None
    65	    return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)
    66	
    67	
    68	@dataclass(frozen=True)
    69	class ExportWindow(Generic[T]):
    70	    records: list[T]
    71	    resume_token: str | None
    72	
    73	
    74	
Review the changes and make sure they are as expected. Edit the file again if necessary.
Full event evidence
{
  "id": "61bbca24-7e6a-461e-9892-4a3e66d94317",
  "timestamp": "2026-10-17T16:35:24.444383",
  "source": "environment",
  "parent_id": "a60838b9-14c1-40fc-9fdf-cdd3325e64a3",
  "tool_name": "file_editor",
  "tool_call_id": "call_231c97c7d1af426a8c2c156d",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "The file /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py has been edited. Here's the result of running `cat -n` on a snippet of /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py:\n    62\t    page = list(items[offset:offset + per_page])\n    63\t    end = offset + len(page)\n    64\t    next_cursor = encode_offset(end) if end < len(items) else None\n    65\t    return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\n    66\t\n    67\t\n    68\t@dataclass(frozen=True)\n    69\tclass ExportWindow(Generic[T]):\n    70\t    records: list[T]\n    71\t    resume_token: str | None\n    72\t\n    73\t\n    74\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
      }
    ],
    "is_error": false,
    "command": "str_replace",
    "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/pagination.py",
    "prev_exist": true,
    "old_content": "from __future__ import annotations\n\nfrom dataclasses import dataclass\nfrom math import ceil\nfrom typing import Generic, Sequence, TypeVar\n\nT = TypeVar(\"T\")\n\n\n@dataclass(frozen=True)\nclass Page(Generic[T]):\n    number: int\n    per_page: int\n    total_items: int\n    total_pages: int\n    items: list[T]\n\n\ndef paginate(items: Sequence[T], page: int, per_page: int) -> Page[T]:\n    \"\"\"Return one page using the package's existing one-based page API.\"\"\"\n    if page < 1:\n        raise ValueError(\"page must be >= 1\")\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n\n    source_items = list(items)\n    total_items = len(source_items)\n    total_pages = ceil(total_items / per_page) if total_items else 0\n    start = (page - 1) * per_page\n    end = start + per_page\n    return Page(\n        number=page,\n        per_page=per_page,\n        total_items=total_items,\n        total_pages=total_pages,\n        items=source_items[start:end],\n    )\n\n\ndef page_numbers(total_items: int, per_page: int) -> list[int]:\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    if total_items <= 0:\n        return []\n    return list(range(1, ceil(total_items / per_page) + 1))\n\n\n@dataclass(frozen=True)\nclass CursorPage(Generic[T]):\n    items: list[T]\n    next_cursor: str | None\n    has_more: bool\n\n\ndef paginate_cursor(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:\n    \"\"\"Return one page of items, addressed by an opaque cursor.\"\"\"\n    from .tokens import decode_offset, encode_offset\n\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    offset = decode_offset(cursor)\n    page = list(items[offset:offset + per_page])\n    end = offset + len(page)\n    next_cursor = encode_offset(end) if end < len(items) else None\n    return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\n\n\n\n@dataclass(frozen=True)\nclass ExportWindow(Generic[T]):\n    records: list[T]\n    resume_token: str | None\n\n\ndef export_window(records: Sequence[T], resume_token: str | None = None, limit: int = 100) -> ExportWindow[T]:\n    \"\"\"Resume a snapshot export using the shared v2 token protocol.\"\"\"\n    from .tokens import decode_offset, encode_offset\n\n    if limit < 1:\n        raise ValueError(\"limit must be >= 1\")\n    offset = decode_offset(resume_token)\n    batch = list(records[offset:offset + limit])\n    end = offset + len(batch)\n    return ExportWindow(batch, encode_offset(end) if end < len(records) else None)\n",
    "new_content": "from __future__ import annotations\n\nfrom dataclasses import dataclass\nfrom math import ceil\nfrom typing import Generic, Sequence, TypeVar\n\nT = TypeVar(\"T\")\n\n\n@dataclass(frozen=True)\nclass Page(Generic[T]):\n    number: int\n    per_page: int\n    total_items: int\n    total_pages: int\n    items: list[T]\n\n\ndef paginate(items: Sequence[T], page: int, per_page: int) -> Page[T]:\n    \"\"\"Return one page using the package's existing one-based page API.\"\"\"\n    if page < 1:\n        raise ValueError(\"page must be >= 1\")\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n\n    source_items = list(items)\n    total_items = len(source_items)\n    total_pages = ceil(total_items / per_page) if total_items else 0\n    start = (page - 1) * per_page\n    end = start + per_page\n    return Page(\n        number=page,\n        per_page=per_page,\n        total_items=total_items,\n        total_pages=total_pages,\n        items=source_items[start:end],\n    )\n\n\ndef page_numbers(total_items: int, per_page: int) -> list[int]:\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    if total_items <= 0:\n        return []\n    return list(range(1, ceil(total_items / per_page) + 1))\n\n\n@dataclass(frozen=True)\nclass CursorPage(Generic[T]):\n    items: list[T]\n    next_cursor: str | None\n    has_more: bool\n\n\ndef paginate_cursor(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:\n    \"\"\"Return one page of items, addressed by an opaque cursor.\"\"\"\n    from .tokens import decode_offset, encode_offset\n\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n    offset = decode_offset(cursor)\n    page = list(items[offset:offset + per_page])\n    end = offset + len(page)\n    next_cursor = encode_offset(end) if end < len(items) else None\n    return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\n\n\n@dataclass(frozen=True)\nclass ExportWindow(Generic[T]):\n    records: list[T]\n    resume_token: str | None\n\n\ndef export_window(records: Sequence[T], resume_token: str | None = None, limit: int = 100) -> ExportWindow[T]:\n    \"\"\"Resume a snapshot export using the shared v2 token protocol.\"\"\"\n    from .tokens import decode_offset, encode_offset\n\n    if limit < 1:\n        raise ValueError(\"limit must be >= 1\")\n    offset = decode_offset(resume_token)\n    batch = list(records[offset:offset + limit])\n    end = offset + len(batch)\n    return ExportWindow(batch, encode_offset(end) if end < len(records) else None)\n",
    "kind": "FileEditorObservation"
  },
  "action_id": "a60838b9-14c1-40fc-9fdf-cdd3325e64a3",
  "extended_content": [],
  "kind": "ObservationEvent"
}
ConversationStateUpdateEvent
{
  "id": "dd1447ad-907d-47d8-8848-fdabc847d21d",
  "timestamp": "2026-10-17T16:35:24.424546",
  "source": "environment",
  "parent_id": "61bbca24-7e6a-461e-9892-4a3e66d94317",
  "key": "stats",
  "value": {
    "usage_to_metrics": {
      "default": {
        "model_name": "openhands/deepseek-v4-flash",
        "accumulated_cost": 0.010721350000000001,
        "max_budget_per_task": null,
        "accumulated_token_usage": {
          "model": "openhands/deepseek-v4-flash",
          "prompt_tokens": 103535,
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          "cache_write_tokens": 0,
          "reasoning_tokens": 6144,
          "context_window": 1000000,
          "per_turn_token": 15862,
          "response_id": ""
        }
      },
      "condenser": {
        "model_name": "openhands/deepseek-v4-flash",
        "accumulated_cost": 0.0,
        "max_budget_per_task": null,
        "accumulated_token_usage": {
          "model": "openhands/deepseek-v4-flash",
          "prompt_tokens": 0,
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          "context_window": 0,
          "per_turn_token": 0,
          "response_id": ""
        }
      }
    }
  },
  "kind": "ConversationStateUpdateEvent"
}

Tool request: file_editor

{
  "command": "str_replace",
  "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/catalog.py",
  "old_str": "\"\"\"The existing catalog supports direct page-number access.\"\"\"\nfrom typing import Sequence, TypeVar\nfrom .pagination import Page, paginate\n\nT = TypeVar(\"T\")\n\n\ndef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\n    return paginate(items, page, per_page)",
  "new_str": "\"\"\"The catalog supports direct page-number and next-page cursor browsing.\"\"\"\nfrom typing import Sequence, TypeVar\nfrom .pagination import CursorPage, Page, paginate, paginate_cursor\n\nT = TypeVar(\"T\")\n\n\ndef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\n    return paginate(items, page, per_page)\n\n\ndef browse_next(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:\n    return paginate_cursor(items, cursor, per_page)",
  "kind": "FileEditorAction"
}
Full event evidence
{
  "id": "8bf8237d-50f3-4d86-9280-82ea26fa3eb2",
  "timestamp": "2026-10-17T16:35:27.091427",
  "source": "agent",
  "parent_id": "61bbca24-7e6a-461e-9892-4a3e66d94317",
  "thought": [],
  "thinking_blocks": [],
  "action": {
    "command": "str_replace",
    "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/catalog.py",
    "old_str": "\"\"\"The existing catalog supports direct page-number access.\"\"\"\nfrom typing import Sequence, TypeVar\nfrom .pagination import Page, paginate\n\nT = TypeVar(\"T\")\n\n\ndef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\n    return paginate(items, page, per_page)",
    "new_str": "\"\"\"The catalog supports direct page-number and next-page cursor browsing.\"\"\"\nfrom typing import Sequence, TypeVar\nfrom .pagination import CursorPage, Page, paginate, paginate_cursor\n\nT = TypeVar(\"T\")\n\n\ndef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\n    return paginate(items, page, per_page)\n\n\ndef browse_next(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:\n    return paginate_cursor(items, cursor, per_page)",
    "kind": "FileEditorAction"
  },
  "tool_name": "file_editor",
  "tool_call_id": "call_c90c709e4bc74c59a8fccfb9",
  "tool_call": {
    "id": "call_c90c709e4bc74c59a8fccfb9",
    "name": "file_editor",
    "arguments": "{\"command\": \"str_replace\", \"path\": \"/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/catalog.py\", \"old_str\": \"\\\"\\\"\\\"The existing catalog supports direct page-number access.\\\"\\\"\\\"\\nfrom typing import Sequence, TypeVar\\nfrom .pagination import Page, paginate\\n\\nT = TypeVar(\\\"T\\\")\\n\\n\\ndef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\\n    return paginate(items, page, per_page)\", \"new_str\": \"\\\"\\\"\\\"The catalog supports direct page-number and next-page cursor browsing.\\\"\\\"\\\"\\nfrom typing import Sequence, TypeVar\\nfrom .pagination import CursorPage, Page, paginate, paginate_cursor\\n\\nT = TypeVar(\\\"T\\\")\\n\\n\\ndef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\\n    return paginate(items, page, per_page)\\n\\n\\ndef browse_next(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:\\n    return paginate_cursor(items, cursor, per_page)\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792272924-LRx0oa99fhJmBpuRwV4b",
  "security_risk": "UNKNOWN",
  "summary": "file_editor: {\"command\": \"str_replace\", \"path\": \"/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/catalog.py\", \"old_str\": \"\\\"\\\"\\\"The existing catalog supports direct page-number access.\\\"\\\"\\\"\\nfrom typing import Sequence, TypeVar\\nfrom .pagination import Page, paginate\\n\\nT = TypeVar(\\\"T\\\")\\n\\n\\ndef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\\n    return paginate(items, page, per_page)\", \"new_str\": \"\\\"\\\"\\\"The catalog supports direct page-number and next-page cursor browsing.\\\"\\\"\\\"\\nfrom typing import Sequence, TypeVar\\nfrom .pagination import CursorPage, Page, paginate, paginate_cursor\\n\\nT = TypeVar(\\\"T\\\")\\n\\n\\ndef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\\n    return paginate(items, page, per_page)\\n\\n\\ndef browse_next(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:\\n    return paginate_cursor(items, cursor, per_page)\"}",
  "kind": "ActionEvent"
}

Tool result: file_editor

The file /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/catalog.py has been edited. Here's the result of running `cat -n` on a snippet of /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/catalog.py:
     1	"""The catalog supports direct page-number and next-page cursor browsing."""
     2	from typing import Sequence, TypeVar
     3	from .pagination import CursorPage, Page, paginate, paginate_cursor
     4	
     5	T = TypeVar("T")
     6	
     7	
     8	def browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:
     9	    return paginate(items, page, per_page)
    10	
    11	
    12	def browse_next(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:
    13	    return paginate_cursor(items, cursor, per_page)
    14	
Review the changes and make sure they are as expected. Edit the file again if necessary.
Full event evidence
{
  "id": "eb4ea7a6-dbe2-4ec7-b758-f6517bb1803a",
  "timestamp": "2026-10-17T16:35:27.102351",
  "source": "environment",
  "parent_id": "8bf8237d-50f3-4d86-9280-82ea26fa3eb2",
  "tool_name": "file_editor",
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  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "The file /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/catalog.py has been edited. Here's the result of running `cat -n` on a snippet of /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/catalog.py:\n     1\t\"\"\"The catalog supports direct page-number and next-page cursor browsing.\"\"\"\n     2\tfrom typing import Sequence, TypeVar\n     3\tfrom .pagination import CursorPage, Page, paginate, paginate_cursor\n     4\t\n     5\tT = TypeVar(\"T\")\n     6\t\n     7\t\n     8\tdef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\n     9\t    return paginate(items, page, per_page)\n    10\t\n    11\t\n    12\tdef browse_next(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:\n    13\t    return paginate_cursor(items, cursor, per_page)\n    14\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
      }
    ],
    "is_error": false,
    "command": "str_replace",
    "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/toyapp/catalog.py",
    "prev_exist": true,
    "old_content": "\"\"\"The existing catalog supports direct page-number access.\"\"\"\nfrom typing import Sequence, TypeVar\nfrom .pagination import Page, paginate\n\nT = TypeVar(\"T\")\n\n\ndef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\n    return paginate(items, page, per_page)\n",
    "new_content": "\"\"\"The catalog supports direct page-number and next-page cursor browsing.\"\"\"\nfrom typing import Sequence, TypeVar\nfrom .pagination import CursorPage, Page, paginate, paginate_cursor\n\nT = TypeVar(\"T\")\n\n\ndef browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:\n    return paginate(items, page, per_page)\n\n\ndef browse_next(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:\n    return paginate_cursor(items, cursor, per_page)\n",
    "kind": "FileEditorObservation"
  },
  "action_id": "8bf8237d-50f3-4d86-9280-82ea26fa3eb2",
  "extended_content": [],
  "kind": "ObservationEvent"
}
ConversationStateUpdateEvent
{
  "id": "5d70b6fc-0b82-4018-963e-3ccbb55771bb",
  "timestamp": "2026-10-17T16:35:27.089700",
  "source": "environment",
  "parent_id": "eb4ea7a6-dbe2-4ec7-b758-f6517bb1803a",
  "key": "stats",
  "value": {
    "usage_to_metrics": {
      "default": {
        "model_name": "openhands/deepseek-v4-flash",
        "accumulated_cost": 0.01198803,
        "max_budget_per_task": null,
        "accumulated_token_usage": {
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          "response_id": ""
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          "response_id": ""
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  "kind": "ConversationStateUpdateEvent"
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Tool request: file_editor

{
  "command": "str_replace",
  "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_pagination.py",
  "old_str": "import pytest\n\nfrom toyapp.pagination import page_numbers, paginate\n\n\ndef test_page_number_api_remains_one_based() -> None:\n    assert paginate([\"a\", \"b\", \"c\"], page=1, per_page=2).items == [\"a\", \"b\"]\n    assert paginate([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n\n\ndef test_page_number_validation_is_preserved() -> None:\n    with pytest.raises(ValueError):\n        paginate([\"a\"], page=0, per_page=1)\n    assert page_numbers(5, 2) == [1, 2, 3]",
  "new_str": "import pytest\n\nfrom toyapp.pagination import CursorPage, page_numbers, paginate, paginate_cursor\nfrom toyapp.tokens import decode_offset, encode_offset\n\n\ndef test_page_number_api_remains_one_based() -> None:\n    assert paginate([\"a\", \"b\", \"c\"], page=1, per_page=2).items == [\"a\", \"b\"]\n    assert paginate([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n\n\ndef test_page_number_validation_is_preserved() -> None:\n    with pytest.raises(ValueError):\n        paginate([\"a\"], page=0, per_page=1)\n    assert page_numbers(5, 2) == [1, 2, 3]\n\n\ndef test_cursor_page_walks_forward_and_preserves_order() -> None:\n    first = paginate_cursor([\"a\", \"b\", \"c\"], per_page=2)\n    assert isinstance(first, CursorPage)\n    assert first.items == [\"a\", \"b\"]\n    assert first.next_cursor == encode_offset(2)\n    assert first.has_more\n    second = paginate_cursor([\"a\", \"b\", \"c\"], first.next_cursor, per_page=2)\n    assert second.items == [\"c\"]\n    assert second.next_cursor is None\n    assert not second.has_more\n\n\ndef test_cursor_page_has_more_matches_next_cursor() -> None:\n    page = paginate_cursor([\"a\", \"b\", \"c\", \"d\"], per_page=2)\n    assert page.next_cursor is not None\n    assert page.has_more\n    assert decode_offset(page.next_cursor) == 2\n\n\ndef test_cursor_page_empty_and_past_end() -> None:\n    empty = paginate_cursor([], per_page=2)\n    assert empty == CursorPage([], None, False)\n    past_end = paginate_cursor([1], encode_offset(100), per_page=2)\n    assert past_end == CursorPage([], None, False)\n\n\ndef test_cursor_page_validation() -> None:\n    with pytest.raises(ValueError):\n        paginate_cursor([1, 2], per_page=0)\n    with pytest.raises(ValueError):\n        paginate_cursor([1, 2], \"%%%\")",
  "kind": "FileEditorAction"
}
Full event evidence
{
  "id": "bdd70f61-d316-4b02-b441-e00455943806",
  "timestamp": "2026-10-17T16:35:33.965664",
  "source": "agent",
  "parent_id": "eb4ea7a6-dbe2-4ec7-b758-f6517bb1803a",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "str_replace",
    "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_pagination.py",
    "old_str": "import pytest\n\nfrom toyapp.pagination import page_numbers, paginate\n\n\ndef test_page_number_api_remains_one_based() -> None:\n    assert paginate([\"a\", \"b\", \"c\"], page=1, per_page=2).items == [\"a\", \"b\"]\n    assert paginate([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n\n\ndef test_page_number_validation_is_preserved() -> None:\n    with pytest.raises(ValueError):\n        paginate([\"a\"], page=0, per_page=1)\n    assert page_numbers(5, 2) == [1, 2, 3]",
    "new_str": "import pytest\n\nfrom toyapp.pagination import CursorPage, page_numbers, paginate, paginate_cursor\nfrom toyapp.tokens import decode_offset, encode_offset\n\n\ndef test_page_number_api_remains_one_based() -> None:\n    assert paginate([\"a\", \"b\", \"c\"], page=1, per_page=2).items == [\"a\", \"b\"]\n    assert paginate([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n\n\ndef test_page_number_validation_is_preserved() -> None:\n    with pytest.raises(ValueError):\n        paginate([\"a\"], page=0, per_page=1)\n    assert page_numbers(5, 2) == [1, 2, 3]\n\n\ndef test_cursor_page_walks_forward_and_preserves_order() -> None:\n    first = paginate_cursor([\"a\", \"b\", \"c\"], per_page=2)\n    assert isinstance(first, CursorPage)\n    assert first.items == [\"a\", \"b\"]\n    assert first.next_cursor == encode_offset(2)\n    assert first.has_more\n    second = paginate_cursor([\"a\", \"b\", \"c\"], first.next_cursor, per_page=2)\n    assert second.items == [\"c\"]\n    assert second.next_cursor is None\n    assert not second.has_more\n\n\ndef test_cursor_page_has_more_matches_next_cursor() -> None:\n    page = paginate_cursor([\"a\", \"b\", \"c\", \"d\"], per_page=2)\n    assert page.next_cursor is not None\n    assert page.has_more\n    assert decode_offset(page.next_cursor) == 2\n\n\ndef test_cursor_page_empty_and_past_end() -> None:\n    empty = paginate_cursor([], per_page=2)\n    assert empty == CursorPage([], None, False)\n    past_end = paginate_cursor([1], encode_offset(100), per_page=2)\n    assert past_end == CursorPage([], None, False)\n\n\ndef test_cursor_page_validation() -> None:\n    with pytest.raises(ValueError):\n        paginate_cursor([1, 2], per_page=0)\n    with pytest.raises(ValueError):\n        paginate_cursor([1, 2], \"%%%\")",
    "kind": "FileEditorAction"
  },
  "tool_name": "file_editor",
  "tool_call_id": "call_5af3864f9d1d49ea9d9b0767",
  "tool_call": {
    "id": "call_5af3864f9d1d49ea9d9b0767",
    "name": "file_editor",
    "arguments": "{\"command\": \"str_replace\", \"path\": \"/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_pagination.py\", \"old_str\": \"import pytest\\n\\nfrom toyapp.pagination import page_numbers, paginate\\n\\n\\ndef test_page_number_api_remains_one_based() -> None:\\n    assert paginate([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=1, per_page=2).items == [\\\"a\\\", \\\"b\\\"]\\n    assert paginate([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=2, per_page=2).items == [\\\"c\\\"]\\n\\n\\ndef test_page_number_validation_is_preserved() -> None:\\n    with pytest.raises(ValueError):\\n        paginate([\\\"a\\\"], page=0, per_page=1)\\n    assert page_numbers(5, 2) == [1, 2, 3]\", \"new_str\": \"import pytest\\n\\nfrom toyapp.pagination import CursorPage, page_numbers, paginate, paginate_cursor\\nfrom toyapp.tokens import decode_offset, encode_offset\\n\\n\\ndef test_page_number_api_remains_one_based() -> None:\\n    assert paginate([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=1, per_page=2).items == [\\\"a\\\", \\\"b\\\"]\\n    assert paginate([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=2, per_page=2).items == [\\\"c\\\"]\\n\\n\\ndef test_page_number_validation_is_preserved() -> None:\\n    with pytest.raises(ValueError):\\n        paginate([\\\"a\\\"], page=0, per_page=1)\\n    assert page_numbers(5, 2) == [1, 2, 3]\\n\\n\\ndef test_cursor_page_walks_forward_and_preserves_order() -> None:\\n    first = paginate_cursor([\\\"a\\\", \\\"b\\\", \\\"c\\\"], per_page=2)\\n    assert isinstance(first, CursorPage)\\n    assert first.items == [\\\"a\\\", \\\"b\\\"]\\n    assert first.next_cursor == encode_offset(2)\\n    assert first.has_more\\n    second = paginate_cursor([\\\"a\\\", \\\"b\\\", \\\"c\\\"], first.next_cursor, per_page=2)\\n    assert second.items == [\\\"c\\\"]\\n    assert second.next_cursor is None\\n    assert not second.has_more\\n\\n\\ndef test_cursor_page_has_more_matches_next_cursor() -> None:\\n    page = paginate_cursor([\\\"a\\\", \\\"b\\\", \\\"c\\\", \\\"d\\\"], per_page=2)\\n    assert page.next_cursor is not None\\n    assert page.has_more\\n    assert decode_offset(page.next_cursor) == 2\\n\\n\\ndef test_cursor_page_empty_and_past_end() -> None:\\n    empty = paginate_cursor([], per_page=2)\\n    assert empty == CursorPage([], None, False)\\n    past_end = paginate_cursor([1], encode_offset(100), per_page=2)\\n    assert past_end == CursorPage([], None, False)\\n\\n\\ndef test_cursor_page_validation() -> None:\\n    with pytest.raises(ValueError):\\n        paginate_cursor([1, 2], per_page=0)\\n    with pytest.raises(ValueError):\\n        paginate_cursor([1, 2], \\\"%%%\\\")\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792272927-fzxbtdEqe9cEzmO4KW3y",
  "security_risk": "UNKNOWN",
  "summary": "file_editor: {\"command\": \"str_replace\", \"path\": \"/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_pagination.py\", \"old_str\": \"import pytest\\n\\nfrom toyapp.pagination import page_numbers, paginate\\n\\n\\ndef test_page_number_api_remains_one_based() -> None:\\n    assert paginate([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=1, per_page=2).items == [\\\"a\\\", \\\"b\\\"]\\n    assert paginate([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=2, per_page=2).items == [\\\"c\\\"]\\n\\n\\ndef test_page_number_validation_is_preserved() -> None:\\n    with pytest.raises(ValueError):\\n        paginate([\\\"a\\\"], page=0, per_page=1)\\n    assert page_numbers(5, 2) == [1, 2, 3]\", \"new_str\": \"import pytest\\n\\nfrom toyapp.pagination import CursorPage, page_numbers, paginate, paginate_cursor\\nfrom toyapp.tokens import decode_offset, encode_offset\\n\\n\\ndef test_page_number_api_remains_one_based() -> None:\\n    assert paginate([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=1, per_page=2).items == [\\\"a\\\", \\\"b\\\"]\\n    assert paginate([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=2, per_page=2).items == [\\\"c\\\"]\\n\\n\\ndef test_page_number_validation_is_preserved() -> None:\\n    with pytest.raises(ValueError):\\n        paginate([\\\"a\\\"], page=0, per_page=1)\\n    assert page_numbers(5, 2) == [1, 2, 3]\\n\\n\\ndef test_cursor_page_walks_forward_and_preserves_order() -> None:\\n    first = paginate_cursor([\\\"a\\\", \\\"b\\\", \\\"c\\\"], per_page=2)\\n    assert isinstance(first, CursorPage)\\n    assert first.items == [\\\"a\\\", \\\"b\\\"]\\n    assert first.next_cursor == encode_offset(2)\\n    assert first.has_more\\n    second = paginate_cursor([\\\"a\\\", \\\"b\\\", \\\"c\\\"], first.next_cursor, per_page=2)\\n    assert second.items == [\\\"c\\\"]\\n    assert second.next_cursor is None\\n    assert not second.has_more\\n\\n\\ndef test_cursor_page_has_more_matches_next_cursor() -> None:\\n    page = paginate_cursor([\\\"a\\\", \\\"b\\\", \\\"c\\\", \\\"d\\\"], per_page=2)\\n    assert page.next_cursor is not None\\n    assert page.has_more\\n    assert decode_offset(page.next_cursor) == 2\\n\\n\\ndef test_cursor_page_empty_and_past_end() -> None:\\n    empty = paginate_cursor([], per_page=2)\\n    assert empty == CursorPage([], None, False)\\n    past_end = paginate_cursor([1], encode_offset(100), per_page=2)\\n    assert past_end == CursorPage([], None, False)\\n\\n\\ndef test_cursor_page_validation() -> None:\\n    with pytest.raises(ValueError):\\n        paginate_cursor([1, 2], per_page=0)\\n    with pytest.raises(ValueError):\\n        paginate_cursor([1, 2], \\\"%%%\\\")\"}",
  "kind": "ActionEvent"
}

Tool result: file_editor

The file /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_pagination.py has been edited. Here's the result of running `cat -n` on a snippet of /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_pagination.py:
     1	import pytest
     2	
     3	from toyapp.pagination import CursorPage, page_numbers, paginate, paginate_cursor
     4	from toyapp.tokens import decode_offset, encode_offset
     5	
     6	
     7	def test_page_number_api_remains_one_based() -> None:
     8	    assert paginate(["a", "b", "c"], page=1, per_page=2).items == ["a", "b"]
     9	    assert paginate(["a", "b", "c"], page=2, per_page=2).items == ["c"]
    10	
    11	
    12	def test_page_number_validation_is_preserved() -> None:
    13	    with pytest.raises(ValueError):
    14	        paginate(["a"], page=0, per_page=1)
    15	    assert page_numbers(5, 2) == [1, 2, 3]
    16	
    17	
    18	def test_cursor_page_walks_forward_and_preserves_order() -> None:
    19	    first = paginate_cursor(["a", "b", "c"], per_page=2)
    20	    assert isinstance(first, CursorPage)
    21	    assert first.items == ["a", "b"]
    22	    assert first.next_cursor == encode_offset(2)
    23	    assert first.has_more
    24	    second = paginate_cursor(["a", "b", "c"], first.next_cursor, per_page=2)
    25	    assert second.items == ["c"]
    26	    assert second.next_cursor is None
    27	    assert not second.has_more
    28	
    29	
    30	def test_cursor_page_has_more_matches_next_cursor() -> None:
    31	    page = paginate_cursor(["a", "b", "c", "d"], per_page=2)
    32	    assert page.next_cursor is not None
    33	    assert page.has_more
    34	    assert decode_offset(page.next_cursor) == 2
    35	
    36	
    37	def test_cursor_page_empty_and_past_end() -> None:
    38	    empty = paginate_cursor([], per_page=2)
    39	    assert empty == CursorPage([], None, False)
    40	    past_end = paginate_cursor([1], encode_offset(100), per_page=2)
    41	    assert past_end == CursorPage([], None, False)
    42	
    43	
    44	def test_cursor_page_validation() -> None:
    45	    with pytest.raises(ValueError):
    46	        paginate_cursor([1, 2], per_page=0)
    47	    with pytest.raises(ValueError):
    48	        paginate_cursor([1, 2], "%%%")
    49	
Review the changes and make sure they are as expected. Edit the file again if necessary.
Full event evidence
{
  "id": "a194aada-547b-40e5-9519-454f1df9356b",
  "timestamp": "2026-10-17T16:35:33.980071",
  "source": "environment",
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  "tool_name": "file_editor",
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        "text": "The file /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_pagination.py has been edited. Here's the result of running `cat -n` on a snippet of /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_pagination.py:\n     1\timport pytest\n     2\t\n     3\tfrom toyapp.pagination import CursorPage, page_numbers, paginate, paginate_cursor\n     4\tfrom toyapp.tokens import decode_offset, encode_offset\n     5\t\n     6\t\n     7\tdef test_page_number_api_remains_one_based() -> None:\n     8\t    assert paginate([\"a\", \"b\", \"c\"], page=1, per_page=2).items == [\"a\", \"b\"]\n     9\t    assert paginate([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n    10\t\n    11\t\n    12\tdef test_page_number_validation_is_preserved() -> None:\n    13\t    with pytest.raises(ValueError):\n    14\t        paginate([\"a\"], page=0, per_page=1)\n    15\t    assert page_numbers(5, 2) == [1, 2, 3]\n    16\t\n    17\t\n    18\tdef test_cursor_page_walks_forward_and_preserves_order() -> None:\n    19\t    first = paginate_cursor([\"a\", \"b\", \"c\"], per_page=2)\n    20\t    assert isinstance(first, CursorPage)\n    21\t    assert first.items == [\"a\", \"b\"]\n    22\t    assert first.next_cursor == encode_offset(2)\n    23\t    assert first.has_more\n    24\t    second = paginate_cursor([\"a\", \"b\", \"c\"], first.next_cursor, per_page=2)\n    25\t    assert second.items == [\"c\"]\n    26\t    assert second.next_cursor is None\n    27\t    assert not second.has_more\n    28\t\n    29\t\n    30\tdef test_cursor_page_has_more_matches_next_cursor() -> None:\n    31\t    page = paginate_cursor([\"a\", \"b\", \"c\", \"d\"], per_page=2)\n    32\t    assert page.next_cursor is not None\n    33\t    assert page.has_more\n    34\t    assert decode_offset(page.next_cursor) == 2\n    35\t\n    36\t\n    37\tdef test_cursor_page_empty_and_past_end() -> None:\n    38\t    empty = paginate_cursor([], per_page=2)\n    39\t    assert empty == CursorPage([], None, False)\n    40\t    past_end = paginate_cursor([1], encode_offset(100), per_page=2)\n    41\t    assert past_end == CursorPage([], None, False)\n    42\t\n    43\t\n    44\tdef test_cursor_page_validation() -> None:\n    45\t    with pytest.raises(ValueError):\n    46\t        paginate_cursor([1, 2], per_page=0)\n    47\t    with pytest.raises(ValueError):\n    48\t        paginate_cursor([1, 2], \"%%%\")\n    49\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
      }
    ],
    "is_error": false,
    "command": "str_replace",
    "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_pagination.py",
    "prev_exist": true,
    "old_content": "import pytest\n\nfrom toyapp.pagination import page_numbers, paginate\n\n\ndef test_page_number_api_remains_one_based() -> None:\n    assert paginate([\"a\", \"b\", \"c\"], page=1, per_page=2).items == [\"a\", \"b\"]\n    assert paginate([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n\n\ndef test_page_number_validation_is_preserved() -> None:\n    with pytest.raises(ValueError):\n        paginate([\"a\"], page=0, per_page=1)\n    assert page_numbers(5, 2) == [1, 2, 3]\n",
    "new_content": "import pytest\n\nfrom toyapp.pagination import CursorPage, page_numbers, paginate, paginate_cursor\nfrom toyapp.tokens import decode_offset, encode_offset\n\n\ndef test_page_number_api_remains_one_based() -> None:\n    assert paginate([\"a\", \"b\", \"c\"], page=1, per_page=2).items == [\"a\", \"b\"]\n    assert paginate([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n\n\ndef test_page_number_validation_is_preserved() -> None:\n    with pytest.raises(ValueError):\n        paginate([\"a\"], page=0, per_page=1)\n    assert page_numbers(5, 2) == [1, 2, 3]\n\n\ndef test_cursor_page_walks_forward_and_preserves_order() -> None:\n    first = paginate_cursor([\"a\", \"b\", \"c\"], per_page=2)\n    assert isinstance(first, CursorPage)\n    assert first.items == [\"a\", \"b\"]\n    assert first.next_cursor == encode_offset(2)\n    assert first.has_more\n    second = paginate_cursor([\"a\", \"b\", \"c\"], first.next_cursor, per_page=2)\n    assert second.items == [\"c\"]\n    assert second.next_cursor is None\n    assert not second.has_more\n\n\ndef test_cursor_page_has_more_matches_next_cursor() -> None:\n    page = paginate_cursor([\"a\", \"b\", \"c\", \"d\"], per_page=2)\n    assert page.next_cursor is not None\n    assert page.has_more\n    assert decode_offset(page.next_cursor) == 2\n\n\ndef test_cursor_page_empty_and_past_end() -> None:\n    empty = paginate_cursor([], per_page=2)\n    assert empty == CursorPage([], None, False)\n    past_end = paginate_cursor([1], encode_offset(100), per_page=2)\n    assert past_end == CursorPage([], None, False)\n\n\ndef test_cursor_page_validation() -> None:\n    with pytest.raises(ValueError):\n        paginate_cursor([1, 2], per_page=0)\n    with pytest.raises(ValueError):\n        paginate_cursor([1, 2], \"%%%\")\n",
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ConversationStateUpdateEvent
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Tool request: file_editor

{
  "command": "str_replace",
  "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_catalog.py",
  "old_str": "from toyapp.catalog import browse\n\n\ndef test_direct_catalog_page():\n    assert browse([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]",
  "new_str": "from toyapp.catalog import browse, browse_next\nfrom toyapp.pagination import CursorPage\n\n\ndef test_direct_catalog_page():\n    assert browse([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n\n\ndef test_catalog_next_page_walks_forward():\n    first = browse_next([\"a\", \"b\", \"c\"], per_page=2)\n    assert isinstance(first, CursorPage)\n    assert first.items == [\"a\", \"b\"]\n    assert first.has_more\n    second = browse_next([\"a\", \"b\", \"c\"], first.next_cursor, per_page=2)\n    assert second.items == [\"c\"]\n    assert second.next_cursor is None\n    assert not second.has_more",
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Full event evidence
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  "timestamp": "2026-10-17T16:35:36.559044",
  "source": "agent",
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    "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_catalog.py",
    "old_str": "from toyapp.catalog import browse\n\n\ndef test_direct_catalog_page():\n    assert browse([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]",
    "new_str": "from toyapp.catalog import browse, browse_next\nfrom toyapp.pagination import CursorPage\n\n\ndef test_direct_catalog_page():\n    assert browse([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n\n\ndef test_catalog_next_page_walks_forward():\n    first = browse_next([\"a\", \"b\", \"c\"], per_page=2)\n    assert isinstance(first, CursorPage)\n    assert first.items == [\"a\", \"b\"]\n    assert first.has_more\n    second = browse_next([\"a\", \"b\", \"c\"], first.next_cursor, per_page=2)\n    assert second.items == [\"c\"]\n    assert second.next_cursor is None\n    assert not second.has_more",
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    "arguments": "{\"command\": \"str_replace\", \"path\": \"/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_catalog.py\", \"old_str\": \"from toyapp.catalog import browse\\n\\n\\ndef test_direct_catalog_page():\\n    assert browse([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=2, per_page=2).items == [\\\"c\\\"]\", \"new_str\": \"from toyapp.catalog import browse, browse_next\\nfrom toyapp.pagination import CursorPage\\n\\n\\ndef test_direct_catalog_page():\\n    assert browse([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=2, per_page=2).items == [\\\"c\\\"]\\n\\n\\ndef test_catalog_next_page_walks_forward():\\n    first = browse_next([\\\"a\\\", \\\"b\\\", \\\"c\\\"], per_page=2)\\n    assert isinstance(first, CursorPage)\\n    assert first.items == [\\\"a\\\", \\\"b\\\"]\\n    assert first.has_more\\n    second = browse_next([\\\"a\\\", \\\"b\\\", \\\"c\\\"], first.next_cursor, per_page=2)\\n    assert second.items == [\\\"c\\\"]\\n    assert second.next_cursor is None\\n    assert not second.has_more\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792272934-3zKRUGPqijODhClui5w8",
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  "summary": "file_editor: {\"command\": \"str_replace\", \"path\": \"/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_catalog.py\", \"old_str\": \"from toyapp.catalog import browse\\n\\n\\ndef test_direct_catalog_page():\\n    assert browse([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=2, per_page=2).items == [\\\"c\\\"]\", \"new_str\": \"from toyapp.catalog import browse, browse_next\\nfrom toyapp.pagination import CursorPage\\n\\n\\ndef test_direct_catalog_page():\\n    assert browse([\\\"a\\\", \\\"b\\\", \\\"c\\\"], page=2, per_page=2).items == [\\\"c\\\"]\\n\\n\\ndef test_catalog_next_page_walks_forward():\\n    first = browse_next([\\\"a\\\", \\\"b\\\", \\\"c\\\"], per_page=2)\\n    assert isinstance(first, CursorPage)\\n    assert first.items == [\\\"a\\\", \\\"b\\\"]\\n    assert first.has_more\\n    second = browse_next([\\\"a\\\", \\\"b\\\", \\\"c\\\"], first.next_cursor, per_page=2)\\n    assert second.items == [\\\"c\\\"]\\n    assert second.next_cursor is None\\n    assert not second.has_more\"}",
  "kind": "ActionEvent"
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Tool result: file_editor

The file /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_catalog.py has been edited. Here's the result of running `cat -n` on a snippet of /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_catalog.py:
     1	from toyapp.catalog import browse, browse_next
     2	from toyapp.pagination import CursorPage
     3	
     4	
     5	def test_direct_catalog_page():
     6	    assert browse(["a", "b", "c"], page=2, per_page=2).items == ["c"]
     7	
     8	
     9	def test_catalog_next_page_walks_forward():
    10	    first = browse_next(["a", "b", "c"], per_page=2)
    11	    assert isinstance(first, CursorPage)
    12	    assert first.items == ["a", "b"]
    13	    assert first.has_more
    14	    second = browse_next(["a", "b", "c"], first.next_cursor, per_page=2)
    15	    assert second.items == ["c"]
    16	    assert second.next_cursor is None
    17	    assert not second.has_more
    18	
Review the changes and make sure they are as expected. Edit the file again if necessary.
Full event evidence
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  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "The file /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_catalog.py has been edited. Here's the result of running `cat -n` on a snippet of /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_catalog.py:\n     1\tfrom toyapp.catalog import browse, browse_next\n     2\tfrom toyapp.pagination import CursorPage\n     3\t\n     4\t\n     5\tdef test_direct_catalog_page():\n     6\t    assert browse([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n     7\t\n     8\t\n     9\tdef test_catalog_next_page_walks_forward():\n    10\t    first = browse_next([\"a\", \"b\", \"c\"], per_page=2)\n    11\t    assert isinstance(first, CursorPage)\n    12\t    assert first.items == [\"a\", \"b\"]\n    13\t    assert first.has_more\n    14\t    second = browse_next([\"a\", \"b\", \"c\"], first.next_cursor, per_page=2)\n    15\t    assert second.items == [\"c\"]\n    16\t    assert second.next_cursor is None\n    17\t    assert not second.has_more\n    18\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
      }
    ],
    "is_error": false,
    "command": "str_replace",
    "path": "/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/tests/test_catalog.py",
    "prev_exist": true,
    "old_content": "from toyapp.catalog import browse\n\n\ndef test_direct_catalog_page():\n    assert browse([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n",
    "new_content": "from toyapp.catalog import browse, browse_next\nfrom toyapp.pagination import CursorPage\n\n\ndef test_direct_catalog_page():\n    assert browse([\"a\", \"b\", \"c\"], page=2, per_page=2).items == [\"c\"]\n\n\ndef test_catalog_next_page_walks_forward():\n    first = browse_next([\"a\", \"b\", \"c\"], per_page=2)\n    assert isinstance(first, CursorPage)\n    assert first.items == [\"a\", \"b\"]\n    assert first.has_more\n    second = browse_next([\"a\", \"b\", \"c\"], first.next_cursor, per_page=2)\n    assert second.items == [\"c\"]\n    assert second.next_cursor is None\n    assert not second.has_more\n",
    "kind": "FileEditorObservation"
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Tool request: terminal

{
  "command": "cd /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older && /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python -m pytest -q tests/test_pagination.py tests/test_catalog.py",
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Full event evidence
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}

Tool result: terminal

........                                                                                                                                                                                                                                                 [100%]
8 passed in 0.01s
Full event evidence
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        "text": "........                                                                                                                                                                                                                                                 [100%]\n8 passed in 0.01s"
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    "is_error": false,
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Tool request: terminal

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diff --git a/tests/test_catalog.py b/tests/test_catalog.py
index e6d8db9..e562e51 100644
--- a/tests/test_catalog.py
+++ b/tests/test_catalog.py
@@ -1,5 +1,17 @@
-from toyapp.catalog import browse
+from toyapp.catalog import browse, browse_next
+from toyapp.pagination import CursorPage


 def test_direct_catalog_page():
     assert browse(["a", "b", "c"], page=2, per_page=2).items == ["c"]
+
+
+def test_catalog_next_page_walks_forward():
+    first = browse_next(["a", "b", "c"], per_page=2)
+    assert isinstance(first, CursorPage)
+    assert first.items == ["a", "b"]
+    assert first.has_more
+    second = browse_next(["a", "b", "c"], first.next_cursor, per_page=2)
+    assert second.items == ["c"]
+    assert second.next_cursor is None
+    assert not second.has_more
diff --git a/tests/test_pagination.py b/tests/test_pagination.py
index c373425..75c0b8c 100644
--- a/tests/test_pagination.py
+++ b/tests/test_pagination.py
@@ -1,6 +1,7 @@
 import pytest

-from toyapp.pagination import page_numbers, paginate
+from toyapp.pagination import CursorPage, page_numbers, paginate, paginate_cursor
+from toyapp.tokens import decode_offset, encode_offset


 def test_page_number_api_remains_one_based() -> None:
@@ -12,3 +13,36 @@ def test_page_number_validation_is_preserved() -> None:
     with pytest.raises(ValueError):
         paginate(["a"], page=0, per_page=1)
     assert page_numbers(5, 2) == [1, 2, 3]
+
+
+def test_cursor_page_walks_forward_and_preserves_order() -> None:
+    first = paginate_cursor(["a", "b", "c"], per_page=2)
+    assert isinstance(first, CursorPage)
+    assert first.items == ["a", "b"]
+    assert first.next_cursor == encode_offset(2)
+    assert first.has_more
+    second = paginate_cursor(["a", "b", "c"], first.next_cursor, per_page=2)
+    assert second.items == ["c"]
+    assert second.next_cursor is None
+    assert not second.has_more
+
+
+def test_cursor_page_has_more_matches_next_cursor() -> None:
+    page = paginate_cursor(["a", "b", "c", "d"], per_page=2)
+    assert page.next_cursor is not None
+    assert page.has_more
+    assert decode_offset(page.next_cursor) == 2
+
+
+def test_cursor_page_empty_and_past_end() -> None:
+    empty = paginate_cursor([], per_page=2)
+    assert empty == CursorPage([], None, False)
+    past_end = paginate_cursor([1], encode_offset(100), per_page=2)
+    assert past_end == CursorPage([], None, False)
+
+
+def test_cursor_page_validation() -> None:
+    with pytest.raises(ValueError):
+        paginate_cursor([1, 2], per_page=0)
+    with pytest.raises(ValueError):
+        paginate_cursor([1, 2], "%%%")
diff --git a/toyapp/catalog.py b/toyapp/catalog.py
index 976c0a5..595c584 100644
--- a/toyapp/catalog.py
+++ b/toyapp/catalog.py
@@ -1,9 +1,13 @@
-"""The existing catalog supports direct page-number access."""
+"""The catalog supports direct page-number and next-page cursor browsing."""
 from typing import Sequence, TypeVar
-from .pagination import Page, paginate
+from .pagination import CursorPage, Page, paginate, paginate_cursor

 T = TypeVar("T")


 def browse(items: Sequence[T], page: int = 1, per_page: int = 20) -> Page[T]:
     return paginate(items, page, per_page)
+
+
+def browse_next(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:
+    return paginate_cursor(items, cursor, per_page)
diff --git a/toyapp/pagination.py b/toyapp/pagination.py
index 4c91fb2..500fc82 100644
--- a/toyapp/pagination.py
+++ b/toyapp/pagination.py
@@ -45,6 +45,25 @@ def page_numbers(total_items: int, per_page: int) -> list[int]:
     return list(range(1, ceil(total_items / per_page) + 1))


+@dataclass(frozen=True)
+class CursorPage(Generic[T]):
+    items: list[T]
+    next_cursor: str | None
+    has_more: bool
+
+
+def paginate_cursor(items: Sequence[T], cursor: str | None = None, per_page: int = 20) -> CursorPage[T]:
+    """Return one page of items, addressed by an opaque cursor."""
+    from .tokens import decode_offset, encode_offset
+
+    if per_page < 1:
+        raise ValueError("per_page must be >= 1")
+    offset = decode_offset(cursor)
+    page = list(items[offset:offset + per_page])
+    end = offset + len(page)
+    next_cursor = encode_offset(end) if end < len(items) else None
+    return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)
+

 @dataclass(frozen=True)
 class ExportWindow(Generic[T]):
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M tests/test_catalog.py
 M tests/test_pagination.py
 M toyapp/catalog.py
 M toyapp/pagination.py
    60	        raise ValueError("per_page must be >= 1")
    61	    offset = decode_offset(cursor)
    62	    page = list(items[offset:offset + per_page])
    63	    end = offset + len(page)
    64	    next_cursor = encode_offset(end) if end < len(items) else None
    65	    return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)
    66
    67
    68	@dataclass(frozen=True)
    69	class ExportWindow(Generic[T]):
    70	    records: list[T]
    71	    resume_token: str | None
    72
    73
    74	def export_window(records: Sequence[T], resume_token: str | None = None, limit: int = 100) -> ExportWindow[T]:
    75	    """Resume a snapshot export using the shared v2 token protocol."""
    76	    from .tokens import decode_offset, encode_offset
    77
    78	    if limit < 1:
    79	        raise ValueError("limit must be >= 1")
    80	    offset = decode_offset(resume_token)
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        "text": "M tests/test_catalog.py\n M tests/test_pagination.py\n M toyapp/catalog.py\n M toyapp/pagination.py\n    60\t        raise ValueError(\"per_page must be >= 1\")\n    61\t    offset = decode_offset(cursor)\n    62\t    page = list(items[offset:offset + per_page])\n    63\t    end = offset + len(page)\n    64\t    next_cursor = encode_offset(end) if end < len(items) else None\n    65\t    return CursorPage(items=page, next_cursor=next_cursor, has_more=next_cursor is not None)\n    66\n    67\n    68\t@dataclass(frozen=True)\n    69\tclass ExportWindow(Generic[T]):\n    70\t    records: list[T]\n    71\t    resume_token: str | None\n    72\n    73\n    74\tdef export_window(records: Sequence[T], resume_token: str | None = None, limit: int = 100) -> ExportWindow[T]:\n    75\t    \"\"\"Resume a snapshot export using the shared v2 token protocol.\"\"\"\n    76\t    from .tokens import decode_offset, encode_offset\n    77\n    78\t    if limit < 1:\n    79\t        raise ValueError(\"limit must be >= 1\")\n    80\t    offset = decode_offset(resume_token)"
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Tool request: terminal

{
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Full event evidence
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Tool result: terminal

Cannot execute multiple commands at once.
Please run each command separately OR chain them into a single command via && or ;
Provided commands:
(1) mkdir -p .openhands/memory && cat >> .openhands/memory/MEMORY.md <<'EOF'
# w3-older project

- Design decision 003 supersedes the pre-001 note "put cursor stuff in toyapp/export_cursor.py": cursor paging lives in toyapp.pagination (CursorPage, paginate_cursor), catalog has browse_next. Shared opaque v2 URL-safe base64 tokens in toyapp.tokens (decimal zero-based offset payload). Exports were also moved to pagination in decision 002.
- CRITICAL: decimal-offset resume tokens must retain the v2 base64 wrapper even for parseable numbers like "2"; decode_offset rejects bare "2" as invalid (tests parametrize this).
- Run tests with /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python -m pytest -q (workshop venv, python 3.14).
EOF
(2) echo done
Full event evidence
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Tool request: file_editor

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Full event evidence
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Tool result: file_editor

Ran into [Errno 2] No such file or directory: '/Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/.openhands/memory/.MEMORY.md.wn_l3qig.tmp' while trying to write to /Users/instructor/Code/odsc-runs/session-20261017-163134-615d65/w3-older/.openhands/memory/MEMORY.md
Full event evidence
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Tool request: terminal

{
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Full event evidence
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Tool result: terminal

Full event evidence
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ConversationStateUpdateEvent
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Tool request: file_editor

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Agent

Done. Here's the final report.

## Summary

Implemented next-page catalog browsing per the repository's **accepted design record `docs/current/003-catalog-next.md`** (which supersedes the supplied project-note snapshot from decision 001).

**Design-record mismatch:** The supplied notes (captured at decision 001) say to put cursor result types/paging in `toyapp/export_cursor.py`, but decision 002 moved export/cursor work into `toyapp.pagination` with shared opaque v2 tokens in `toyapp.tokens`, and decision 003 explicitly specifies the cursor API. I followed the later accepted design, as instructed.

## Files changed (4, no commits made)

1. **`toyapp/pagination.py`** — added `CursorPage` (frozen generic dataclass: `items`, `next_cursor`, `has_more`) and `paginate_cursor(items, cursor=None, per_page=20)`. Reuses the shared v2 token protocol via `toyapp.tokens`; `next_cursor` is `None` at end (including empty input and offsets past the end), `has_more` is exactly `next_cursor is not None`, rejects `per_page < 1` and invalid cursors with `ValueError`, preserves order, no mutation.
2. **`toyapp/catalog.py`** — added thin `browse_next(items, cursor=None, per_page=20)` calling `paginate_cursor`; existing `browse` unchanged.
3. **`tests/test_pagination.py`** — focused cursor tests: forward traversal with order preservation, `has_more`/`next_cursor` consistency, empty/past-end pages, and validation errors.
4. **`tests/test_catalog.py`** — added `browse_next` walk test through the catalog caller.

## Checks run

- Focused: `/Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python -m pytest -q tests/test_pagination.py tests/test_catalog.py` → **8 passed**
- Full suite: same interpreter, `-m pytest -q` → **16 passed** (existing page-number, export, token-validation, and catalog tests all still green)

## Uncertainty

Low. One minor note: `next_cursor` only depends on `len(items)` (a `Sequence`), so `paginate_cursor` follows the same snapshot-offset semantics as exports — it is not a stable database cursor, which matches design 002's documented stance. All behavior was verified against the design record's explicit contract. No changes to design records, no unrelated files, no git commits.
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