Proto Wire Break Check

Runs the same checker as our npm package on a Node.js runtime that pip installs for you (nodejs-wheel-binaries) - no system Node.js needed. Your files are checked locally.

Names the .proto edits that keep compiling and quietly change what old gRPC readers see

Install

proto-wire-break-check file

Node 18+. The same 17 rules as the VS Code extension, from a terminal or CI.

Free

• Open any .proto, run one command, and all 17 rules run on that file: every finding with its line number, what an old reader will do with that byte, and the edit that keeps the wire intact. The 27-line sample in the repo returns 18 findings, 10 of them errors; the clean sample returns 0. No key, no account - that is the whole job for one file.
• --rules lists every rule

With a licence ($29 once)

• The full version sweeps every .proto in the workspace in one pass and writes PROTO-WIRE-AUDIT.md plus audit.json - one file you can commit, attach to a pull request, or fail a build on. $29 once, one licence key per person or team seat.

proto-wire-break-check --dir ./templates --report html --out report.html

A contract backend engineer runs $60+/hour on the public marketplaces, and reviewing one service's schema history by hand is an afternoon of that.

Use from an AI agent (MCP)

Claude Code · Cursor · Windsurf · any MCP client - add to your MCP config:

{ "mcpServers": { "proto-wire-break-check": { "command": "proto-wire-break-check", "args": ["--mcp"] } } }

Tools: check_text and check_file (free) · check_dir (licence). The agent gets every finding with the line number.

Use in CI

- name: Proto Wire Break Check
  run: pip install rulestamp-proto-wire-break-check && proto-wire-break-check --dir . --ci

The folder sweep, reports and CI mode need one licence — one payment, no subscription. Set READYSTACK_LICENSE=<key> or run --license <key> once.

Get a licence

Install (PyPI)

pip install rulestamp-proto-wire-break-check
proto-wire-break-check --help