| name | rules |
| description | Maintains project .codex/rules and the AGENTS.md rule index. Explicit user invocation only. |
Codex project rules
Use only when the user explicitly requests rule creation, synchronization, improvement, review, or inventory.
Sources of truth
- Store rule bodies under the project
.codex/rules/; never use personal or foreign-assistant rule paths.
- Treat hierarchical
AGENTS.md files as Codex's automatically loaded instruction surface.
- Keep rule content in one file.
AGENTS.md contains a compact index, not copied rule bodies.
Workflow
- Read the applicable
AGENTS.md files and inventory every project rule with rg --files .codex/rules | sort.
- Resolve the request to create, improve, review, list, or synchronize. Persist durable repository facts only; exclude secrets, transient session state, generated reports, and duplicate instructions.
- Create or update English rule files under
.codex/rules/. Reuse an existing rule when its scope matches.
- Update the nearest applicable
AGENTS.md rule-index table. The repository-root table lists every .codex/rules/*.md file exactly once with columns Rule, Load when, and Purpose. Nested tables add only subtree-specific rules not already covered by the inherited root index.
- Invoke
$brewtools:text-optimize -l for every changed rule and AGENTS.md index. Preserve paths, scope qualifiers, safety constraints, and table structure; apply the optimized patch only after comparing semantics.
- Re-run the complete inventory. Fail validation when any rule path is missing from the root index, any indexed path is stale, or a rule body was duplicated into
AGENTS.md.
- Report changed rules, index rows, optimization measurements, and validation evidence.
The index makes rules discoverable; it does not auto-load their bodies. During later work, read the indexed rule whose Load when condition matches the task.
