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Agent skill

Harness Diagnostics

by jh941213 in jh941213/my-cc-harness

Self-diagnostics and improvement suggestions based on 12-principle agent harness.

No licenceAuto-check: notesDevelopment

Install Harness Diagnostics

skills CLI
$ npx skills add jh941213/my-cc-harness --skill harness-diagnostics -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jh941213/my-cc-harness harness-diagnostics --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jh941213/my-cc-harness.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills_en/harness-diagnostics .claude/skills/harness-diagnostics && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
harness-diagnostics
GitHub stars
126
Token cost
~1.4k tokens
SKILL.md length
475 words
Files
1
Skills in repo
62
Repo updated
First seen
Licence
None found

At a glance

Self-diagnostics and improvement suggestions based on 12-principle agent harness.

  • Works in 4 steps: Explore project root (Explore sub-agent) → Check existence of these items → Recommend creation for missing items (do… → …
  • Tasks that involve Debugging
  • SKILL.md covers Input, Mode Selection, 12-Principle Scoring System and Execution Procedure, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Harness Diagnostics is an agent skill from jh941213/my-cc-harness. Self-diagnostics and improvement suggestions based on 12-principle agent harness. No automatic invocation — run manually via /harness-diagnostics (choose setup/audit/maintenance mode by argument). NOT for: code implementation, bug fixes, writing tests.

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Debugging.

When your agent uses it

  • Tasks that involve Debugging

Example prompts

  • “/harness-diagnostics”

Requirements

  • Pre-approved tools (allowed-tools): Read, Grep, Glob, Bash

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Explore project root (Explore sub-agent)
  2. Check existence of these items
  3. Recommend creation for missing items (do not create directly)
  4. Recommendation priority: P0 (immediate) -> P1 (recommended) -> P2 (improvement)

What it can do on your machine

Read from SKILL.md and the folder at commit e9210e2. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Grep
    • Glob
    • Bash

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are markdown).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Harness Diagnostics loads about 1.4k tokens when it runs. Until then it costs about 68 tokens; SKILL.md has 475 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~68
When it runs · the whole SKILL.md, loaded when a task matches
~1.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Grep, Glob, Bash

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 475 words (~1,357 tokens).

“12-principle based harness maturity diagnostics and improvement suggestion tool. Read-only: Performs diagnostics + suggestions only; does not directly modify files.”

— opening of SKILL.md by jh941213
name
harness-diagnostics
allowed-tools
Read, Grep, Glob, Bash
user-invocable
true
disable-model-invocation
true

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills_en/harness-diagnostics of jh941213/my-cc-harness.

Open the folder on GitHubat commit e9210e2

Compare with similar skills

Harness Diagnostics next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Harness Diagnostics compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Harness Diagnostics this skilljh941213/my-cc-harness126—~1.4kAutomated safety check: NotesNone
Trellis Session Insightmindfold-ai/Trellis15k4 repos~1.7kAutomated safety check: PassAGPL-3.0
Native Data FetchingCherryHQ/cherry-studio-app4k6 repos~2.9kAutomated safety check: NotesMIT
Debugging Executionsn8n-io/n8n207k—~2.6kAutomated safety check: PassCustom licence
Aoti Debugpytorch/pytorch104k1 repos~1.7kAutomated safety check: PassCustom licence
Herdr Throwaway Reproductionherdrdev/herdr43k—~2.4kAutomated safety check: PassApache-2.0

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Categories

Questions about Harness Diagnostics

What does Harness Diagnostics do?

Self-diagnostics and improvement suggestions based on 12-principle agent harness. Harness Diagnostics is an agent skill from jh941213/my-cc-harness. Self-diagnostics and improvement suggestions based on 12-principle agent harness.

When should I use Harness Diagnostics?

Harness Diagnostics fits situations like: tasks that involve Debugging.

How do I install Harness Diagnostics in Claude Code?

Run `npx skills add jh941213/my-cc-harness --skill harness-diagnostics -a claude-code`. Or copy the skill folder (skills_en/harness-diagnostics in jh941213/my-cc-harness) into .claude/skills/harness-diagnostics in your project. Claude Code loads it when a task matches its description.

How do I install Harness Diagnostics in Codex?

Run `npx skills add jh941213/my-cc-harness --skill harness-diagnostics -a codex`. Or copy the skill folder (skills_en/harness-diagnostics in jh941213/my-cc-harness) into .agents/skills/harness-diagnostics in your project. Codex loads it when a task matches its description.

Can I use Harness Diagnostics in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jh941213/my-cc-harness --skill harness-diagnostics -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/harness-diagnostics, .gemini/skills/harness-diagnostics, .github/skills/harness-diagnostics and .opencode/skills/harness-diagnostics in your project.

What does Harness Diagnostics need to run?

SKILL.md names no scripts, command-line tools or credentials: Harness Diagnostics is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Grep, Glob, Bash.

Does Harness Diagnostics access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Harness Diagnostics safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Harness Diagnostics use?

No licence was found for Harness Diagnostics or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Harness Diagnostics use?

About 1.4k tokens (SKILL.md is roughly 5.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Harness Diagnostics?

Skills that share tags, products or a category with Harness Diagnostics: Trellis Session Insight (mindfold-ai/Trellis, 15k stars), Native Data Fetching (CherryHQ/cherry-studio-app, 4k stars), Debugging Executions (n8n-io/n8n, 207k stars) and Aoti Debug (pytorch/pytorch, 104k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Harness Diagnostics?

jh941213 (a GitHub user) maintains it in jh941213/my-cc-harness, which has 126 GitHub stars. The repository holds 62 skills in this directory. The repository was last updated on August 3, 2026.

Source: jh941213/my-cc-harness on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.