Borrowing it
Nothing to install: this file belongs to Pirate-Kitty/hayabusa-mcp-security-scanner. 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/Pirate-Kitty/hayabusa-mcp-security-scanner/main/CLAUDE.mdgit clone --depth 1 https://github.com/Pirate-Kitty/hayabusa-mcp-security-scannerWrote 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/pirate-kitty/hayabusa-mcp-security-scanner/claude-md)<a href="https://agentmods.dev/instructions/pirate-kitty/hayabusa-mcp-security-scanner/claude-md"><img src="https://agentmods.dev/badge/instructions/pirate-kitty/hayabusa-mcp-security-scanner/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/pirate-kitty/hayabusa-mcp-security-scanner/claude-md"><img src="https://agentmods.dev/badge/instructions/pirate-kitty/hayabusa-mcp-security-scanner/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 | $0.00302 | $0.00302 |
| Opus 5 | $0.00151 | $0.00151 |
| Sonnet 5 | $0.00060 | $0.00060 |
| Haiku 4.5 | $0.00030 | $0.00030 |
Grade A, and why
hayabusa-mcp-security-scanner 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 11d 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.
What it actually says
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Project overview
This project is an MCP (Model Context Protocol) server that wraps Hayabusa for EVTX (Windows Event Log) analysis.
Goals
- Expose a
scan_evtxtool that runs Hayabusa against EVTX files, returning structured JSON, filterable by severity level, with graceful error handling - Expose a
get_hayabusa_rulestool to list/search the bundled Hayabusa and Sigma detection rules - Expose
analyze_coverageandsuggest_ruletools for MITRE ATT&CK technique coverage checks and read-only rule-drafting guidance - Expose read-only
detection://MCP resources for browsing the bundled rule set and technique coverage (see README.md for the full list)
Stack
- Python, using the
mcplibrary - Hayabusa CLI, installed locally (invoked as a subprocess)
- PyYAML for parsing the bundled detection rules
Skills
.claude/skills/detection-engineering/— project-scoped skill for authoring, validating, and checking MITRE ATT&CK coverage of detection rules using the tools above. Use it when asked to write, validate, or check coverage for a Sigma/Hayabusa rule.
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.
- 11d ago First seen · 25 lines · 302 tokens per session scan A f08477a29aa8
hayabusa-mcp-security-scanner CLAUDE.md is an instructions file published in the GitHub repository Pirate-Kitty/hayabusa-mcp-security-scanner (0 stars, last pushed 1mo ago), licensed MIT. It adds 302 tokens to every session, about $0.0015 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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