crab: CRAB (Clean Rebuild of Anything's Behavior): rebuild software from behavior, not source code

by lemonadesaltbagel · MCP Server · ★ 161

Last updated: · Indexed by AgentSkillsHub · Auto-synced every 8h

How to install crab

uv tool install "crab-cleanroom[web]"   # Python 3.12+; the command is `crab`

Taken from the project's README on GitHub.

Security audit verdict: SAFE · quality 73/100

None of the 42 rules matched — no credential harvesting, no data exfiltration, no curl-pipe-shell installer. Scanned against 42 published rules built on the SlowMist agent-security taxonomy, refreshed every 8 hours.

The quality score combines nine heuristic checks of the repo and its README: completeness, clarity, specificity, examples, structure, agent readiness, step-by-step content, instruction quality and security notes. It rates how well the project explains itself to an agent, not the code.

ai-agentsbehavioral-testingblack-box-testingclean-room-reimplementationmodel-context-protocolplaywrightreverse-enginneringsandboxingsoftware-reimplementationspecification-generation

Quick Facts

Stars161
Forks26
LanguagePython
CategoryMCP Server
LicenseApache-2.0
Quality Score73/100
Last Updated2026-11-03
Created2026-10-22
Platformsmcp, python
Est. Tokens~16k

About crab

CRAB Clean Rebuild of Anything's Behavior Clean-room reimplementation by black-box observation. See a feature you like. Rebuild it from how it behaves, never from its code. Quick start · How CRAB works · What you can analyze · Results · FAQ · Documentation uv tool install "crab-cleanroom[web]" && crab demo [!NOTE] CRAB was called Teardown until 0.3.

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How this security grade is produced

Grades come from a rule-based scan built on the SlowMist agent-security taxonomy: 42 published rules, covering credential harvesting, data exfiltration, curl | sh installers and more. It is a first-layer scan, not a manual audit — we say so rather than overstate it.

The scale of the problem is documented independently: Liu et al. (2026), in a study of 31,132 agent skills, report that 26.1% contain security vulnerabilities. Our own full-catalog census is published as a citable open dataset.

Sources & who's responsible:

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