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Snag · FMEA for pull requests
Snag turns a change into a Happy Path → Failure Map. Start with the open-core CLI on your own machine — the backend adds a collaborative layer on top of the same maps.
The CLI is the open core: bring your own LLM key, generate maps locally, and commit them next to the code they describe. Requires Node.js ≥ 20.
Install it globally, or run it on demand with npx:
npm install -g @snag-run/cli
snag --help
# …or run without installing:
npx @snag-run/cli --help
Snag talks to your model provider with your API key,
read from the environment — nothing is proxied through a Snag service. The
default provider is Anthropic; openai and openrouter work too.
export ANTHROPIC_API_KEY=sk-ant-... # default provider
# …or a single key for whichever adapter is active:
export SNAG_API_KEY=...
↳
Override per run with --adapter
/ --model, e.g. snag map prd.md --adapter openai --model gpt-5.4-mini.
snag map
auto-resolves the target: a .md/.txt
doc becomes a spec, a code file a module, a bare name a capability.
snag map docs/prd/checkout.md
# → writes .snag/maps/docs/prd/checkout/<timestamp>.json (commit this)↳ Maps are JSON, meant to be committed — diffs across snapshots show how a change's failure surface moves over time.
snag view
serves a read-only map browser — the same viewer the demo maps
use.
snag view
# → http://localhost:7624 (omit the map arg for an index of every map)The CLI is single-player and offline. The backend keeps the same maps but adds a place for a team to read and argue about them together — hosted, with sign-in and shared workspaces. It's in active development; there's nothing to install yet.