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 skills add nikitaCodeSave/claude-code-harness --skill harnessgit clone --depth 1 https://github.com/nikitaCodeSave/claude-code-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/nikitacodesave/claude-code-harness/harness)<a href="https://agentmods.dev/skills/nikitacodesave/claude-code-harness/harness"><img src="https://agentmods.dev/badge/skills/nikitacodesave/claude-code-harness/harness/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/nikitacodesave/claude-code-harness/harness"><img src="https://agentmods.dev/badge/skills/nikitacodesave/claude-code-harness/harness.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00224 | $0.04068 |
| Opus 5.5 | $0.00090 | $0.01627 |
| Sonnet 5.5 | $0.00045 | $0.00814 |
| Haiku 4.5 | $0.00022 | $0.00407 |
Grade A, and why
claude-code-harness 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 1mo 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 — 224 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Claude Code Harness
Designs, bootstraps, audits, and extends the harness around Claude Code — the .claude/
directory and root CLAUDE.md that turn a fresh repository into a high-leverage agentic
workspace. Opinionated, and the opinion is one line:
Under a capable model, less harness yields more productivity. Find the simplest setup that works; add a component only when a simpler approach demonstrably underperforms. If a component encodes "the model can't do X" and the model already does X natively, it should not exist. (Model-agnostic principle — don't re-pin it to a version; evidence in
references/evidence-base.md.)
When to use
- A project has no
.claude/and wants its harness now → Bootstrap (production-grade default; minimal on explicit request). - A project has a
.claude/that has accumulated cruft (custom orchestrator subagent, multi-stage pipeline, 500-line CLAUDE.md, mid-thought blocking hooks, prescriptive stack presets, stale model-version pins, duplicate skills) → Audit. - About to add a hook/skill/subagent/command and want to confirm a built-in doesn't already cover it → Extend.
- Someone asks how Claude Code differs from generic agentic frameworks, or when to use a dynamic workflow → Explain.
Do NOT use when: this project's .claude/ already encodes this discipline (the skill is
transmittable knowledge, not a self-description for a mature setup). Judge that on the repository
in front of you, never on the operator's global layer: a practised operator carries this discipline
in ~/.claude/CLAUDE.md, and reading that as "already encoded" makes the skill decline in every
one of their projects — including the empty ones it exists for. Measured 2026-09-09: a fresh
project got no harness while artifacts accumulated anyway. Also skip when the question is
about building a harness inside another framework (OpenAI/Codex/MCP-without-Claude) → point to
references/evidence-base.md external sources — an external CLI attached to this harness via
MCP is in scope, not an exclusion (references/codex-peer-skill.md); the question is general
programming/debugging.
What ships with it
13 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.
- .claude-plugin/plugin.json 731 B
- references/audit-checklist.md 36 KB
- references/bootstrap-checklist.md 36 KB
- references/codex-peer-skill.md 13 KB
- references/evidence-base.md 15 KB
- references/harness-discipline.md 17 KB
- references/harness-evolution.md 9.5 KB
- references/native-capabilities.md 65 KB
- references/operator-playbook.md 15 KB
- references/project-docs/docs-discipline.md 9.0 KB
- references/project-docs/testing.md 2.0 KB
- references/project-docs/workflow.md 7.3 KB
- scripts/release.sh 3.7 KB runs code
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.
- 1mo ago Changed · +8 lines 05d20a29618f
- 1mo ago Changed · +4 lines 4755ff7b6a5b
- 1mo ago First seen · 212 lines · 224 tokens per session scan A 78f496dca1f3
claude-code-harness is a skill published in the GitHub repository nikitaCodeSave/claude-code-harness (4 stars, last pushed 1mo ago), licensed MIT. It adds 224 tokens to every session and 4,068 once invoked, about $0.0009 per session on Opus 5.5. 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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