| name | codex-hygiene |
| description | Audit Codex Desktop context and tool surfaces with compact read-only telemetry. Use when usage rises unexpectedly, `codex_apps` is large, many MCPs or plugins are enabled, snapshot rows repeat, project stanzas are stale, or long-running goals may be reloading unnecessary context. |
Codex Hygiene
Audit first, identify the measured contributor, and make reversible changes only when the user asks. Keep required evidence and capabilities available.
Workflow
- Resolve this skill's directory from the loaded
SKILL.md path.
- Run the bundled measurement before making claims:
"<skill-directory>/scripts/measure_codex_context.sh" 30
"<skill-directory>/scripts/measure_codex_context.sh" 5 <thread_id>
- Classify the strongest measured contributor:
- large
codex_apps tool surface
- enabled unused MCPs or plugins
- repeated tool-list or uncached snapshot rows
- stale
[projects."..."] stanzas
- long-thread context replay or active transcript rereading
- subagent, automation, or high-reasoning fan-out
- Return exact timestamps and compact counts with one recommended sequence.
- Back up
config.toml before any approved edit.
- Remeasure the same window and thread scope after the change.
Interpret Signals Carefully
- Tool-list and snapshot rows describe context/tool assembly, not actual tool calls.
- Plugin enablement does not prove that plugin tools were attached to the model.
- Cached app inventory can be stale and does not prove current app enablement.
- Per-thread token deltas are local cumulative telemetry, not billing totals.
- Treat internal SQLite schemas and cache layouts as version-dependent.
Guardrails
- Use
sqlite3 -readonly for Codex databases.
- Do not dump full logs, config, app or MCP schemas, secrets,
.env values, or complete missing-path lists.
- Do not delete logs, caches, config, worktrees, or project directories as a first response.
- Do not disable surfaces without explicit user approval or a clear prior preference.
- Preserve small required helpers unless the user asks to remove them. Common examples are
node_repl and openai-api-key-local-confirmation.
- Prefer local
git and gh for ordinary commits, rebases, merges, and pushes when PR, issue, review, CI artifact, or remote API tools are unnecessary.
App Controls
Use current documented per-app controls when only selected connectors should be disabled:
[apps."connector-id"]
enabled = false
Use the global switch only when the user wants all Apps/connectors unavailable or fresh measurement shows that per-app controls do not shrink the surface on that local build:
[features]
apps = false
Verify either change against fresh-thread list_all_tools rows. See the remediation reference for backups, MCP controls, project-local configuration, and observed fallback behavior.
Long-Running Goals
Do not treat a valuable long-running goal as the problem by default. Separate:
- runtime-managed resume, compaction, system, or tool context that may already be attached
- agent-chosen rereading of old rollouts, transcripts, broad plugin docs, or unrelated evidence
A narrowing prompt can stop unnecessary agent-chosen reads; it cannot guarantee that runtime-managed context was removed. Compare with a fresh tiny measurement thread when attribution matters, while preserving the active goal unless the user approves a fork, archive, reset, or replacement.
Read the long-thread reference when the goal must stay alive or final analysis quality must remain high.
Verification
Create a fresh measurement thread when useful:
Please reply exactly: OK
Then rerun the five-minute measurement with that thread id. Good signs include:
- no
codex_apps rows when Apps are globally disabled
- only intentionally available MCPs in
list_all_tools
- fewer or explainable snapshot rows
- lower per-thread cumulative deltas, or a remaining floor attributable to base, system, tool, or thread context
Final Report
Return:
- measured contributor and confidence
- change made or prepared
- capability intentionally retained
- remaining uncertainty or approval boundary
- verification performed
