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armis-appsec-mcp: Instructions file for Claude Code

CLAUDE.md

armis-appsec-mcp CLAUDE.md is an instructions file for Claude Code from ArmisSecurity/armis-appsec-mcp. It costs 7,169 tokens per session, scanned A, original, Apache-2.0.

A Claude Code plugin that scans source code for security problems and can check code changes before they are committed or submitted for review. It provides scans through an MCP server, automatic checks, and a /security-scan command.

In plain words
What is it for?
Use it to scan files, code, or changes; approve findings; inspect scan settings; and enforce security checks around Git commits, pushes, and pull requests.
Why use it?
It helps catch security issues before code is committed, pushed, or proposed in a pull request, reducing the chance that unsafe code reaches the project.

Instructions file for Claude Code

Written for Claude Code: PreToolUse hook event. Also seen: reads .claude/ paths; mentions .claude-plugin; mentions CLAUDE.md.

This is ArmisSecurity/armis-appsec-mcp's own configuration. It tells Claude Code how to work on armis-appsec-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything armis-appsec-mcp configures →

Runs only inside a plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else, and the catalogue could not identify which plugin ships it.

not rated 6repo changed today A scan 7,169 tokens original Apache-2.0
View source ↗ ArmisSecurity/armis-appsec-mcp
Reuse

Borrowing it

Nothing to install: this file belongs to ArmisSecurity/armis-appsec-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/ArmisSecurity/armis-appsec-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/ArmisSecurity/armis-appsec-mcp

Made for: Claude Code.

Wrote 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.

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README.md
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Your own site
<a href="https://agentmods.dev/instructions/armissecurity/armis-appsec-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/armissecurity/armis-appsec-mcp/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.

agentmods 80×15 button for armis-appsec-mcp CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/armissecurity/armis-appsec-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/armissecurity/armis-appsec-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 7,169 This file is loaded in full into every session.
When invoked 7,169 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.07169 $0.07169
Opus 5.5 $0.02868 $0.02868
Sonnet 5.5 $0.01434 $0.01434
Haiku 4.5 $0.00717 $0.00717

Measured today against content hash 3859e1c48f23, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

armis-appsec-mcp 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 today.

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.

CLAUDE.md · 196 lines

How it starts

The opening of the file, as written. The whole thing — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

What this repo is

A Claude Code plugin (not a library) that exposes Armis's AI-powered SAST scanner through three surfaces:

  1. MCP server (server.py) — tools scan_code, scan_file, scan_files, scan_diff, approve_findings, debug_config and the appsec://last-scan resource.
  2. PreToolUse hooks (hooks/) — a commit gate that blocks git commit / git push / gh pr create until a scan has passed, plus a guard that prevents Write/Edit from forging .scan-pass.
  3. Slash command (skills/security-scan/SKILL.md) — on-demand /security-scan invocation.

Distribution is via .claude-plugin/marketplace.json; the plugin installs under ~/.claude/plugins/cache/armis-appsec-mcp/armis-appsec/<version>/ and is launched by .mcp.json's extensionless run (POSIX: an sh shim that execs run.sh; Windows: resolves to run.cmd, which finds Git for Windows' bash.exe and hands it run.sh as a forward-slash path). run.sh bootstraps a per-install .venv keyed off requirements.txt's SHA-256; it only looks for a system Python (hooks/find-python.sh) when that venv must be rebuilt.

Requires Python 3.12+. Credentials (ARMIS_CLIENT_ID, ARMIS_CLIENT_SECRET) live in a .env in the plugin directory.

Common commands

make lint          # ruff check . --fix
make format        # ruff format .
make format-check  # ruff format --check .  (what CI runs)
make typecheck     # mypy . --exclude '.venv|__pycache__|hooks/tests'
make test          # pytest --cov --cov-report=term-missing
make check         # format-check + lint + typecheck + test  (full CI gate locally)

# Run a single test file / test
pytest hooks/tests/test_suppression.py -v
pytest hooks/tests/test_server_helpers.py::test_validate_file_path_blocks_etc -v

# Other useful targets
make install-hooks   # symlink git-hooks/pre-commit into .git/hooks/
make uninstall-hooks # remove the symlink
make setup CLIENT=cursor  # generate MCP config (cursor|vscode|gemini|copilot)

# Run the MCP server directly (stdio transport, reads .env)
./run.sh
# or, if deps already installed:
python server.py

Read the full file on GitHub · 196 lines

Changes

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.

  1. today Changed · +550 tokens per session 3859e1c48f23
  2. 2d ago Changed · +1 lines · +422 tokens per session b8fa9de93ff4
  3. 4d ago Changed · +4 lines · +547 tokens per session b45f8c011c4b
  4. 6d ago Changed · +1 lines · +78 tokens per session 6abf34eedfb0
  5. 19d ago Changed · +1 lines · +63 tokens per session 21b26a965ef3
  6. 1mo ago Changed · +6 lines · +605 tokens per session 0967506fd599
  7. 1mo ago First seen · 183 lines · 4,904 tokens per session scan A e92866056119

Subscribe to this mod's changes

armis-appsec-mcp CLAUDE.md is an instructions file published in the GitHub repository ArmisSecurity/armis-appsec-mcp (6 stars, last pushed yesterday), licensed Apache-2.0. It adds 7,169 tokens to every session, about $0.0287 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.

Security
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