What is harness-doctor?

A command that runs the complete AI Harness Doctor pipeline on a code repository. AI Harness Doctor checks the instructions, tools, and setup used by coding agents.

Use it for the initial checks, improvement work, and follow-up drift check. The efficacy evaluation phase runs only when explicitly requested.

It applies the repository's installed diagnostic process in order, making it easier to find setup problems without manually choosing and running each phase.

harness-doctor — Command for Claude Code by NieZhuZhu

Install

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.

Clone the repo

git clone --depth 1 https://github.com/NieZhuZhu/ai-harness-doctor

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/niezhuzhu/ai-harness-doctor/harness-doctor/github.svg)](https://agentmods.dev/commands/niezhuzhu/ai-harness-doctor/harness-doctor)

Your own site

<a href="https://agentmods.dev/commands/niezhuzhu/ai-harness-doctor/harness-doctor"><img src="https://agentmods.dev/badge/commands/niezhuzhu/ai-harness-doctor/harness-doctor/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.

Your own site · 80×15

<a href="https://agentmods.dev/commands/niezhuzhu/ai-harness-doctor/harness-doctor"><img src="https://agentmods.dev/badge/commands/niezhuzhu/ai-harness-doctor/harness-doctor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 6 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 155 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00006	$0.00155
Opus 5.5	$0.00002	$0.00062
Sonnet 5.5	$0.00001	$0.00031
Haiku 4.5	$0.00001	$0.00015

Measured 2mo ago against content hash b5329942da4c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

harness-doctor 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 2mo 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.

Origin

Copies of this mod

4 near-identical copies found in the catalogue:

harness-scan — 86% identical, 4 lines differ
harness-eval — 84% identical, 4 lines differ
harness-treat — 84% identical, 4 lines differ
harness-drift — 84% identical, 4 lines differ

commands/harness-doctor.md · 14 lines

What it actually says

Target repo: $ARGUMENTS if provided, otherwise the current working directory.

Locate the installed AI Harness Doctor skill in this order:

<target-repo>/.claude/skills/ai-harness-doctor
~/.claude/skills/ai-harness-doctor

Read <skill>/SKILL.md first. Then execute phases 0→2 in order (phase 3 only when explicitly requested) on the target repo, obeying the exact stop condition documented in SKILL.md. Use the deterministic scripts under <skill>/scripts/; do not substitute scripts from the target repo unless they are the installed skill scripts.

Changes

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.

2mo ago First seen · 14 lines · 6 tokens per session scan A b5329942da4c

Subscribe to this mod's changes

harness-doctor is a command published in the GitHub repository NieZhuZhu/ai-harness-doctor (3 stars, last pushed 23d ago), licensed MIT. It adds 6 tokens to every session and 155 once invoked, about $0.0000 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.

Building agents Claude Code Debugging agent-config agents-md ai-agents claude cli

harness-doctor next to 6 commands from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
harness-doctorNieZhuZhu/ai-harness-doctor	Command	3	23d ago	MIT	A	6	Claude Code
audit-selfalipajand/agent-context-doctor	Command	1	yesterday	MIT	A	10	Claude Code
apex-quickfusengine/codex	Command	2	25d ago	none	A	41	Claude Code
explain-errorGoldziher/ai-rulez	Command	167	yesterday	MIT	A	15	Claude Code
debug-filesgetsentry/toolkit	Command	958	today	none	A	0	Claude Code
releasegetsentry/toolkit	Command	958	today	none	A	0	Claude Code
dart-symbol-mapgetsentry/toolkit	Command	958	today	none	A	0	Claude Code