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---
name: changelog-observer
description: Track development session events in a daily markdown changelog, including file changes, test results, and key decisions.
allowed-tools:
- Read
- Write
- Edit
- Bash
user-invocable: true
---
# Changelog Observer
Track session context in `.changelog/session-YYYY-MM-DD.md`.
## Log target
- Use `.changelog/session-YYYY-MM-DD.md` for the current local date.
- Create `.changelog/` and the session file if they do not exist.
- If the session file is new, initialize it from [template.md](template.md).
- Append new entries in chronological order.
## What to log
- `file-change`: after creating, editing, or deleting project files.
- `test-result`: after running tests, checks, or validation commands.
- `decision`: after making an implementation or architecture decision worth preserving.
## Entry rules
- Keep each description short and specific.
- List only directly affected files.
- Use `none` when no files were changed.
- Do not rewrite earlier entries unless they are incorrect.
## Template
Use the markdown structure in [template.md](template.md) for each appended entry.
