Borrowing it
Nothing to install: this file belongs to snapsynapse/skill-provenance. 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/snapsynapse/skill-provenance/main/CLAUDE.mdgit clone --depth 1 https://github.com/snapsynapse/skill-provenanceWrote 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/snapsynapse/skill-provenance/claude-md)<a href="https://agentmods.dev/instructions/snapsynapse/skill-provenance/claude-md"><img src="https://agentmods.dev/badge/instructions/snapsynapse/skill-provenance/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/snapsynapse/skill-provenance/claude-md"><img src="https://agentmods.dev/badge/instructions/snapsynapse/skill-provenance/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 | $0.01212 | $0.01212 |
| Opus 5.5 | $0.00485 | $0.00485 |
| Sonnet 5.5 | $0.00242 | $0.00242 |
| Haiku 4.5 | $0.00121 | $0.00121 |
Grade A, and why
skill-provenance 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 27d 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 — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Provenance
A metaskill for version tracking across Agent Skills sessions, surfaces, and platforms. This is a skill bundle project, not a library.
Canonical site: https://skillprovenance.dev/ | Repo: snapsynapse/skill-provenance (public, MIT). Ships as a Claude Code plugin and as a standalone .skill upload. Zero external dependencies by design (bash + shasum/sha256sum + awk + zip only).
Key files
skill-provenance/SKILL.md-- the skill definition (what agents read)skill-provenance/MANIFEST.yaml-- file inventory with roles, versions, SHA-256 hashesskill-provenance/CHANGELOG.md-- rolling recent history (last 5 entries)skill-provenance/evals.json-- 43 core evaluation scenariosskill-provenance/evals-distribution.json-- 21 supplemental distribution evalsskill-provenance/validate.sh-- local hash verification scriptskill-provenance/package.sh-- derived copy generator (strict/ClawHub)skill-provenance/references/standalone-verification.md-- no-plugin verify/bootstrap pathverify.sh-- standalone wrapper pinned to the canonical validatoraction.yml-- GitHub Actions Marketplace wrapper for bundle validationCHANGELOG.md-- full append-only repo historyAGENTS.md-- detailed guide for agents working on this repo
Claude Code plugin
This repo doubles as a Claude Code plugin. The plugin structure:
.claude-plugin/plugin.json-- plugin manifest (name, version, metadata).claude-plugin/marketplace.json-- marketplace listing for self-hosted installskills/open/SKILL.md--/skill-provenance:open(verify bundle on session start)skills/close/SKILL.md--/skill-provenance:close(update versions on session end)skills/handoff/SKILL.md--/skill-provenance:handoff(generate handoff note)skills/bootstrap/SKILL.md--/skill-provenance:bootstrap(version an unversioned bundle)skills/skill-provenance-- symlink toskill-provenance/for the monolithic skill
The five focused skills extract specific workflows from the monolithic SKILL.md.
The symlink preserves /skill-provenance:skill-provenance as the full monolithic skill.
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.
- 27d ago Changed · +1 lines · +29 tokens per session 71a9ff975c64
- 1mo ago Changed · -1 lines 1a6ac976c43e
- 1mo ago First seen · 87 lines · 1,183 tokens per session scan A 4f8794b0b0a1
skill-provenance CLAUDE.md is an instructions file published in the GitHub repository snapsynapse/skill-provenance (7 stars, last pushed 28d ago), licensed MIT. It adds 1,212 tokens to every session, about $0.0048 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.
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.