Borrowing it
Nothing to install: this file belongs to merlinhu1/truthmark. 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/merlinhu1/truthmark/main/CLAUDE.mdgit clone --depth 1 https://github.com/merlinhu1/truthmarkWrote 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/merlinhu1/truthmark/claude-md)<a href="https://agentmods.dev/instructions/merlinhu1/truthmark/claude-md"><img src="https://agentmods.dev/badge/instructions/merlinhu1/truthmark/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/merlinhu1/truthmark/claude-md"><img src="https://agentmods.dev/badge/instructions/merlinhu1/truthmark/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 | $0.01708 | $0.01708 |
| Opus 5.5 | $0.00683 | $0.00683 |
| Sonnet 5.5 | $0.00342 | $0.00342 |
| Haiku 4.5 | $0.00171 | $0.00171 |
Grade A, and why
truthmark 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 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.
This is a copy
100% identical to truthmark AGENTS.md — 15 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Repository rule source of truth: docs/repo/ai/repo-rules.md. Follow repository instruction files that are present in this checkout; do not assume optional policy docs exist.
Use explicitly configured repository policy docs only when they exist in this checkout.
Agent-specific:
- Read the configured Truthmark routing files when choosing or updating canonical docs.
- Use repository onboarding or docs-map files only when present and needed for unclear or cross-area routing.
Authority
Conflict order:
- this file (
docs/repo/ai/repo-rules.md) - .truthmark/config.yml
- docs/truthmark/routes/areas.md and
docs/truthmark/routes/areas/**/*.md docs/repo/standards/**/*.mddocs/repo/architecture/**/*.mddocs/truthmark/product/**/*.mdanddocs/truthmark/engineering/**/*.md
Authoritative context is the current checkout plus user-provided session context; chat, external notes, and off-repo memory are non-authoritative unless committed or supplied now.
Code is the implementation. On code/doc conflict, inspect code, decide whether code is intentional or docs are stale, update stale docs for intentional behavior, and change code to match docs only when requested or required.
Documentation Scope
Everything under docs/repo/** is repo-local policy for developing Truthmark itself. It ships to nobody, src/** never references it, and it is not a downstream scaffold, generated surface, or required artifact for repositories that install Truthmark. Repo-local docs declare scope: repo-local and use doc_type, never truth_kind.
Everything else under docs/** describes the installed product. docs/truthmark/** is this repository dogfooding the same truth schema truthmark init scaffolds downstream, so it is evidence about the product; docs/repo/** is not.
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 · -15 lines · -318 tokens per session a653f5e4cfc4
- 2mo ago First seen · 92 lines · 2,026 tokens per session scan A 8a13713ff019
truthmark CLAUDE.md is an instructions file published in the GitHub repository merlinhu1/truthmark (91 stars, last pushed 1mo ago), licensed MIT. It adds 1,708 tokens to every session, about $0.0068 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to truthmark AGENTS.md, differing in 15 lines, and is treated as a copy.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.