Analyze branch diff against merge-base — stat overview, full diff, file list, commit list, or branch overlap check. Always uses merge-base to exclude main's forward progress.
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See how to installReview the instructions the agent will receive before you install.
Analyze the current branch's diff against its merge-base with main.
/diff # Stat overview (default)
/diff full # Full patch output
/diff files # List changed files only
/diff commits # List commits on this branch
/diff overlap feature/other-branch # Check for file overlap with another branch
# CORRECT — only shows YOUR changes
git diff $(git merge-base main HEAD)..HEAD
# WRONG — includes main's forward progress as noise
git diff main
| Argument | Action |
|---|---|
stat or (empty) | git --no-pager diff $(git merge-base main HEAD)..HEAD --stat |
full | git --no-pager diff $(git merge-base main HEAD)..HEAD | head -200 |
files | git --no-pager diff $(git merge-base main HEAD)..HEAD --name-only |
commits | git --no-pager log $(git merge-base main HEAD)..HEAD --oneline |
overlap <branch> | Cross-branch file overlap check (see below) |
BRANCH_A_FILES=$(git --no-pager diff $(git merge-base main HEAD)..HEAD --name-only)
BRANCH_B_FILES=$(git --no-pager diff $(git merge-base main <other-branch>)..<other-branch> --name-only)
# Show files that appear in both
comm -12 <(echo "$BRANCH_A_FILES" | sort) <(echo "$BRANCH_B_FILES" | sort)
For stat/default mode, report:
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Route a codebase question to the right tool — structural graph, semantic search, or risk analysis. Use when you need to find or understand code without knowing exact file names.
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Auto-configure CLAUDE.md and claude/ knowledge docs for a new project. Use when setting up Brain Bootstrap in a new repository. Discovers the codebase, fills in templates, and writes project-specific configuration.
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Use before any new feature, component, or behavioral change — when you need to explore requirements and design before writing code
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Activate safety guards for the session. Use /careful before critical operations — blocks rm -rf, DROP TABLE, git push --force, kubectl delete namespace, docker system prune via PreToolUse hook.
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Generate a user-facing changelog from git commits — categorize, filter noise, translate to user language. Runs in isolated fork context.
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Save session state before context gets full or before ending. Writes current task state, branch, and loaded docs to claude/tasks/todo.md so the next session can resume cleanly.
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