ecfr

A Claude Code skill for looking up, searching, and reading federal regulations from the Electronic Code of Federal Regulations (eCFR).

What it does

Gives Claude the ability to search, browse, and read CFR text directly from the terminal using the @poamslayer/ecfr CLI. Useful for compliance work, defense contracting, CMMC, FAR/DFARS research, and anything that requires reading regulatory text.

Prerequisites

Install the eCFR CLI globally:

npm i -g @poamslayer/ecfr

No authentication required -- it wraps the public eCFR API.

Install the skill

# Clone into your Claude Code skills directory
git clone https://github.com/arnoldadlv/ecfr-skill.git ~/.claude/skills/ecfr

That's it. Claude Code picks up skills from ~/.claude/skills/ automatically.

What Claude can do with this

• Read regulation text -- specific sections, parts, or full titles (current or historical)
• Search the CFR -- full-text search with title/agency filters
• Browse structure -- navigate the hierarchy of any CFR title
• Track changes -- see amendments to specific parts/sections since a given date
• View corrections -- find FR corrections for any title

Example prompts

• "What does 32 CFR Part 2002 say about CUI marking?"
• "Search DFARS for cybersecurity incident reporting requirements"
• "Has 48 CFR Part 252 changed since January 2025?"
• "Which agencies own CFR Title 32?"