Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/chachamaru127/codex-harness/harness-updatenpx skills add Chachamaru127/codex-harness --skill harness-updategit clone --depth 1 https://github.com/Chachamaru127/codex-harnessWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/chachamaru127/codex-harness/harness-update)<a href="https://agentmods.dev/skills/chachamaru127/codex-harness/harness-update"><img src="https://agentmods.dev/badge/skills/chachamaru127/codex-harness/harness-update.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00053 | $0.00907 |
| Opus 5 | $0.00026 | $0.00453 |
| Sonnet 5 | $0.00011 | $0.00181 |
| Haiku 4.5 | $0.00005 | $0.00091 |
Grade A, and why
harness-update scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Harness Update Skill
Safely update projects with existing harness to the latest harness version. Version detection → Backup → Non-destructive update flow preserves existing settings and tasks while introducing latest features.
Quick Reference
- "I want to update harness to the latest version"
- "I want to add new features to existing project"
- "I want to update config file format to latest version"
- "I want to fix incorrect permission syntax"
- "I was notified of template updates"
Deliverables
- Version detection via
.claude-code-harness-version - Template update detection and localization judgment
- Identify files needing update
- Auto-backup creation
- Non-destructive settings/workflow file updates
- No localization → overwrite / Localized → merge support
- Skills diff detection - Auto-detect and propose new skills
- Optional: Codex CLI sync (
.codex/+AGENTS.md) - Post-update verification
Execution Flow Overview
| Phase | Reference | Description |
|---|---|---|
| Phase 1 | references/version-detection.md | Version detection and confirmation |
| Phase 1.5 | references/breaking-changes.md | Breaking changes detection and fix |
| Phase 2 | references/backup-and-update.md | Backup creation and file updates |
| Phase 3 | references/verification.md | Verification and completion |
Phase Summary
Phase 1: Version Detection
- Check
.claude-code-harness-versionfile - Compare with plugin's latest version
- Run
template-tracker.sh checkfor content-level updates - Confirm update scope with user
If harness not installed: Suggest using /harness-init instead.
Phase 1.5: Breaking Changes Detection
Detect and fix existing settings issues:
- Incorrect permission syntax (e.g.,
Bash(npm run *)→Bash(npm run:*)) - Deprecated settings (e.g.,
disableBypassPermissionsMode) - Old hook settings in project files (should use plugin hooks.json)
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 101 lines · 53 tokens per session scan A 34543b95226f
harness-update is a skill published in the GitHub repository Chachamaru127/codex-harness (2 stars, last pushed 6mo ago), licensed MIT. It adds 53 tokens to every session and 907 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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