jj-set-bookmark

name	jj-set-bookmark
description	Ensure the current jj revision has a bookmark. Determines prefix from CLAUDE.md, analyzes changes to generate a topic name, and creates the bookmark.
allowed-tools	["Agent"]

Set Bookmark

Ensure the current revision has a bookmark.

CRITICAL: Conversation context may contain stale jj state (old diffs, descriptions, logs). You MUST dispatch a subagent to inspect the live jj state directly. Do NOT rely on any jj output already in the conversation.

Execution

Spawn a subagent with the following prompt:

You are setting a jj bookmark on the current revision. Inspect the LIVE state — do not trust any prior context.

1. Check if the project has a `CLAUDE.md` file at the repository root.
   - Look for a line matching `## JJ Bookmark Prefix: <prefix>` (e.g., `## JJ Bookmark Prefix: joshua/`)
   - If found, extract the prefix (including trailing slash if present)
   - If not found, use no prefix

2. Run `jj log -r @ -T 'bookmarks'` to check if current revision already has a bookmark.
   - If a bookmark already exists, report it and stop.

3. Find the branch point: `jj log -r 'ancestors(@) & bookmarks() & ~remote_bookmarks()' -n 1`

4. Analyze ALL changes from branch point to current:
   - `jj diff -r '<branch-point>::@'`
   - `jj log -r '<branch-point>::@' --no-graph -T 'description'`

5. Create a bookmark name: `<prefix><topic>` where topic is a short kebab-case description of the overall changes.

6. Set the bookmark: `jj bookmark set <name>`

7. Report what bookmark was set.

Always use `jj` commands, never `git`.

After the subagent returns, report the result to the user.