AI BriefingLeanREA cuts execution time by 38% vs. REA using an 8KB skill file (self-measured)
·2026.10.19 19:30
Key point
By replacing REA's 207 MCP tools with an 8KB skill file, the author's self-benchmark showed a 38% reduction in execution time and a 35% reduction in cost.
Details
- An agent skill that enables coding agents to execute shell tools directly using a single 8KB SKILL.md file instead of 207 MCP tools
- In the author's self-benchmark (3 iterations) using Claude Code Sonnet 5.5, LeanREA recorded a 38% reduction in execution time, a 35% reduction in cost, and a score of 74/75 compared to REA (which scored 75/75)
- On immediate load, REA consumed 400.7k tokens ($1.60), while LeanREA consumed 34.5k tokens ($0.09), significantly reducing context burden
- Because it does not provide structured records based on Evidence IDs and only reads output, it is unsuitable for security audit tasks requiring verification and retention
- Unresolved issues exist, including a pipe escape error in the router table, missing Ghidra scripts, and missing quotes in rm -rf commands
- Can be installed by running the
npx skills add aicodeking/leanreacommand or by cloning the repository and copying it to the~/.claude/skills/folder
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