Shannon is an open-source AI penetration tester for web applications and APIs that examines source code, finds attack paths, and runs exploits to verify vulnerabilities. Security teams and developers use it to test software before production and produce findings for security workflows. Its catalogue commands and instruction support operating Shannon.
Borrowing it
Nothing to install: this file belongs to KeygraphHQ/shannon. 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/KeygraphHQ/shannon/main/CLAUDE.mdgit clone --depth 1 https://github.com/KeygraphHQ/shannonWrote 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/keygraphhq/shannon/claude-md)<a href="https://agentmods.dev/instructions/keygraphhq/shannon/claude-md"><img src="https://agentmods.dev/badge/instructions/keygraphhq/shannon/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/keygraphhq/shannon/claude-md"><img src="https://agentmods.dev/badge/instructions/keygraphhq/shannon/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 | $0.08788 | $0.08788 |
| Opus 5.5 | $0.03515 | $0.03515 |
| Sonnet 5.5 | $0.01758 | $0.01758 |
| Haiku 4.5 | $0.00879 | $0.00879 |
Grade A, and why
shannon 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 23d 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.
The source is not reproduced here
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 23d ago Changed · +93 tokens per session 45145ca01e0e
- 28d ago Changed · +53 tokens per session 031e1561a781
- 1mo ago Changed · +140 tokens per session cd45bf37b0ed
- 1mo ago Changed · +574 tokens per session 11582be35b30
- 1mo ago Changed · +11 lines · +968 tokens per session fdcdea2b0800
- 2mo ago First seen · 257 lines · 6,960 tokens per session scan A 708a9caeb88e
shannon CLAUDE.md is an instructions file published in the GitHub repository KeygraphHQ/shannon (50,161 stars, last pushed 2d ago), licensed AGPL-3.0. It adds 8,788 tokens to every session, about $0.0352 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 2026-08-30.
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).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.