See which tools fail most in your Claude Code sessions.
npx cc-fail
- Overall failure rate — what % of tool calls return errors
- Per-tool failure rates — Bash, WebFetch, Read, Edit, Write...
- Error categories — bash-exit, token-limit, permission, timeout, network
- Per-project failure rates — which project has the most errors
- Worst session — the single session with the highest failure rate
cc-fail — Tool Failure Analysis
════════════════════════════════════════
▸ Overview
Total tool calls: 144,851
Failed: 7,060 (4.9%)
Succeeded: 137,791 (95.1%)
▸ Failure rate by tool
WebFetch 24.7% 376/1521
Bash 6.2% 3377/54178
Read 2.1% 84/4001
▸ Error types
bash-exit ████████████████ 2499
parallel-error ██████░░░░░░░░░░ 1005
token-limit ██░░░░░░░░░░░░░░ 429
permission █░░░░░░░░░░░░░░░ 198
npx cc-fail --json60 free tools for Claude Code users. → yurukusa.github.io/cc-toolkit