etch-loop 0.4.3

Run Claude Code in a fix-break loop until your codebase is clean

  ███████╗████████╗ ██████╗██╗  ██╗
  ██╔════╝╚══██╔══╝██╔════╝██║  ██║
  █████╗     ██║   ██║     ███████║
  ██╔══╝     ██║   ██║     ██╔══██║
  ███████╗   ██║   ╚██████╗██║  ██║
  ╚══════╝   ╚═╝    ╚═════╝╚═╝  ╚═╝  loop

Run Claude Code in a scan-fix-break loop until your codebase is clean.

---

┌─ etch loop v0.2.0  . ───────────────────────────────────────────────┐
│                                                                      │
│  -  iteration  1                                                     │
│  +  scanner    issues found   src/auth.py:42 — no empty token check  │
│  +  fixer      committed      fix(edge): guard empty token in auth   │
│  x  breaker    issues         unguarded access still reachable       │
│                                                                      │
│  -  iteration  2                                                     │
│  +  scanner    issues found   src/auth.py:61 — missing None check    │
│  +  fixer      committed      fix(edge): null guard on session obj   │
│  >  breaker    running        ░░░░░░▓▒ ░░░░░░░░░░░░░░░░░░░░░░░░░░   │
│                                                                      │
├──────────────────────────────────────────────────────────────────────┤
│  iterations 2   fixes 2   breaker issues 1   1m 48s elapsed         │
└──────────────────────────────────────────────────────────────────────┘

---

install

uv tool install etch-loop

usage

etch init                        # analyze codebase with Claude, write prompt files
etch run                         # start the loop
etch run "the auth module"       # focus on a specific area
etch run -n 5                    # max 5 iterations
etch run --dry-run               # preview prompt, don't run
etch run --verbose               # show full Claude output

---

how it works

Each iteration has three phases: scan → fix → break.

1. Scanner reads the codebase and outputs a specific list of issues — file paths, line numbers, descriptions
2. If the scanner finds nothing, the loop stops
3. Fixer receives the scanner's list and fixes those exact issues, then commits
4. Breaker adversarially reviews the full codebase, looking for anything missed or newly introduced
5. If the breaker finds nothing, the loop stops — clean pass
6. If the breaker finds something, it's fed back to the next iteration's fixer

┌─ done ───────────────────────────────────────────────────┐
│                                                          │
│  iterations      3                                       │
│  fixes           3                                       │
│  breaker issues  1                                       │
│  elapsed         2m 44s                                  │
│                                                          │
└──────────────────────────────────────────────────────────┘

---

etch init

etch init runs Claude against your codebase before writing any files. It reads your source, detects the languages and structure, and generates three prompt files tailored to your project — no placeholders to edit.

┌─ etch init v0.2.0 ───────────────────────────────────────┐
│  >  analyzing  ░░░░░▓▒ ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░   │
│  +  analyzed codebase                                    │
│  +  SCAN.md                                              │
│  +  ETCH.md                                              │
│  +  BREAK.md                                             │
└──────────────────────────────────────────────────────────┘

SCAN.md — tells the scanner what to look for and how to report findings.

ETCH.md — tells the fixer how to fix things: surgical, no refactoring, one fix per commit.

BREAK.md — tells the breaker to scan the full codebase adversarially and report anything that could go wrong.

All three files are editable. Use etch run "focus description" to narrow the scope without editing files.

---

requirements

• Python 3.11+
• claude CLI installed and authenticated
• A git repository (etch-loop commits each fix automatically)