# Agent Session: codex-task99-guardrails-20260222T010930Z-m9q2

- alias: `codex-task99-guardrails`
- mission: `Execute TASK-99 maintainability guardrail expansion and runtime cycle checks end-to-end without commit`
- status: `done`
- start_utc: `2026-02-22T01:09:30Z`
- last_update_utc: `2026-02-22T03:01:34Z`

## Intent

- Load TASK-99 context from Backlog MCP and align with current guardrail scripts.
- Produce execution plan with writing-plans skill and execute via executing-plans skill.
- Parallelize independent slices (guardrail thresholds, cycle-check fixture/tests, CI/docs wiring).

## Planned Files

- `scripts/check-file-budgets.mjs`
- `scripts/check-runtime-cycles.mjs`
- `scripts/check-runtime-cycles.test.mjs`
- `.github/workflows/ci.yml`
- `docs/development.md`

## Assumptions

- Existing guardrail scripts already run in CI and can be extended without changing toolchain.
- Runtime cycle checks should target source modules involved in runtime/composer refactors.
- Baseline threshold evidence can be captured from current repository metrics.

## Log

- `2026-02-22T01:09:30Z` session started; loaded backlog overview/task context; setting up plan-first workflow.
- `2026-02-22T02:25:00Z` wrote plan to `docs/plans/2026-02-22-task-99-maintainability-guardrails-runtime-cycles.md` and stored implementation plan in Backlog TASK-99.
- `2026-02-22T02:45:00Z` parallel slices completed: hotspot budget guardrail enhancements and runtime cycle checker + fixtures/tests + package scripts.
- `2026-02-22T03:01:34Z` integrated CI fail-fast guardrail step, added contributor guardrail docs with baselines, ran verification lanes, and prepared Backlog finalization.

## Files Touched

- `docs/subagents/INDEX.md`
- `docs/subagents/agents/codex-task99-guardrails-20260222T010930Z-m9q2.md`
- `docs/subagents/collaboration.md`
- `docs/plans/2026-02-22-task-99-maintainability-guardrails-runtime-cycles.md`
- `scripts/check-file-budgets.ts`
- `scripts/check-runtime-cycles.ts`
- `scripts/check-runtime-cycles.test.ts`
- `scripts/fixtures/runtime-cycles/acyclic/entry.ts`
- `scripts/fixtures/runtime-cycles/acyclic/feature.ts`
- `scripts/fixtures/runtime-cycles/acyclic/utils/index.ts`
- `scripts/fixtures/runtime-cycles/cyclic/module-a.ts`
- `scripts/fixtures/runtime-cycles/cyclic/module-b.ts`
- `scripts/fixtures/runtime-cycles/cyclic/nested/index.ts`
- `package.json`
- `.github/workflows/ci.yml`
- `docs/development.md`
- `backlog/tasks/task-99 - Expand-maintainability-guardrails-and-runtime-cycle-checks.md`

## Next Step

- Finalize Backlog TASK-99 AC/DoD + summary and hand off for user review (no commit).