Borrowing it
Nothing to install: this file belongs to tjdwls101010/Harness-Creator. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/tjdwls101010/Harness-Creator/main/CLAUDE.mdgit clone --depth 1 https://github.com/tjdwls101010/Harness-CreatorWrote 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/instructions/tjdwls101010/harness-creator/claude-md)<a href="https://agentmods.dev/instructions/tjdwls101010/harness-creator/claude-md"><img src="https://agentmods.dev/badge/instructions/tjdwls101010/harness-creator/claude-md/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/instructions/tjdwls101010/harness-creator/claude-md"><img src="https://agentmods.dev/badge/instructions/tjdwls101010/harness-creator/claude-md.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 | $0.00596 | $0.00596 |
| Opus 5 | $0.00298 | $0.00298 |
| Sonnet 5 | $0.00119 | $0.00119 |
| Haiku 4.5 | $0.00060 | $0.00060 |
Grade A, and why
Harness-Creator CLAUDE.md 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 10d 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 — 18 lines — stays where its author put it; the contents beside it link to each section on GitHub.
harness-creator
This repo builds harness-creator, a meta-skill that designs, generates, and validates Claude Code harnesses (CLAUDE.md, rules, skills, hooks, permissions, agents, workflows) for other projects through a structured interview.
Where things live
- The skill itself: .claude/skills/harness-creator/ —
SKILL.mdis the orchestrator,references/holds per-component authoring guides,scripts/holds the Python CLIs it calls. - The binding implementation spec: docs/plan/, one directory per generation with the newest last — start at the highest-numbered one's
00-overview.md, which carries that generation's decision log and says which earlier decisions it revises. Earlier generations stay as written; they are the citation record, not a live spec. If you change a decision, edit the newest generation's plan and record why. - Self-test fixtures for the scripts:
tests/fixtures/at the repo root, not inside the skill — anything under the skill directory ships to plugin users, so dev-only fixtures stay outside it. - Local reference snapshots the plan was researched against:
.tmp/docs_claude/and.tmp/skill-creator/— gitignored, not part of this repo's own history.
Working on this repo
- This repo is dogfooding its own output shape:
.claude/skills/harness-creator/is simultaneously (a) a project skill for this repo and (b) the plugin's skill component (.claude-plugin/plugin.json'sskillsfield points here). Don't duplicate the skill elsewhere. - Daily development loop is the symlink, not the plugin install:
~/.claude/skills/harness-creator→ this repo's skill directory. Edits are reflected immediately in a fresh session. Only install the plugin via the local marketplace when smoke-testing the distribution path itself, and uninstall it afterward — running both at once double-registers the skill under two different names (bareharness-creatorvs.harness-creator:harness-creator). - No mid-sentence hard line-wraps in any markdown written here (SKILL.md, references, this file, generated harness output). Line breaks only at sentence/list/paragraph boundaries — hard wraps break Edit-tool string matching and pollute diffs, and renderers soft-wrap anyway.
- Every claim the skill makes about Claude Code mechanics (hook exit codes, matcher syntax, CLAUDE.md loading semantics, etc.) must be checked against
.tmp/docs_claude/ordocs/plan/research/before being written into a reference file — this skill's entire value is gotcha density, and a wrong gotcha is worse than no gotcha.
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.
- 10d ago First seen · 18 lines · 596 tokens per session scan A c790c6ff184d
Harness-Creator CLAUDE.md is an instructions file published in the GitHub repository tjdwls101010/Harness-Creator (4 stars, last pushed 2d ago), licensed MIT. It adds 596 tokens to every session, about $0.0030 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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