Reads a GitHub pull request through the API and reports what a maintainer would normally check by hand. It never clones the repository, never executes pull-request-controlled code, and never calls a language model.

The npm package is mergewarden and the installed executable is mergewarden.

Most people run this as a GitHub Action so it happens on every pull request. The CLI is for looking at one pull request, or a whole queue, from your terminal.

Try one finding

npx --yes mergewarden demo

Once npm has downloaded the package, the demo needs no token or repository and makes no GitHub API calls. It scans one synthetic pull request that quietly edits CLAUDE.md and reports the finding a default installation would leave for a reviewer.

Read a whole queue

npx mergewarden@0.10.4 triage owner/repository

20 open pull request(s) read. 9 have something a maintainer checks by hand.

#6941  update-unmanaged-certificates       no description · template unused
#7227  add-tests                           no linked issue · oversized
#7790  feat/dedup-dynamic-upstreams        no linked issue · template unused

Nothing was closed, labelled, or commented on.

This needs GH_TOKEN set, even on a public repository. It makes one request per pull request, and GitHub allows 60 an hour without one. A personal access token with no scopes selected is enough, since nothing here writes. Without one it reports what it could not read and exits non-zero rather than showing a queue it only half saw.

Scan one pull request

npx mergewarden@0.10.4 scan owner/repository#123

Full pull request URLs are accepted too. A single public pull request works without a token.

mergewarden scan https://github.com/owner/repository/pull/123 --format markdown
mergewarden scan owner/repository#123 --config policies/mergewarden.yml --mode warn

Set GH_TOKEN (preferred) or GITHUB_TOKEN for private repositories and higher rate limits. There is deliberately no command-line flag for the token, because flags end up in shell history and CI logs.

Exit codes are stable. scan and replay return 0 for a complete pass or warning, 1 for a complete block decision, and 2 for usage, API, configuration, or incomplete-analysis failures.

triage differs, because a partly-read queue is still worth printing: 0 when every pull request was read, 1 when some could not be and the answer is therefore partial, and 2 when the arguments were wrong or the listing itself failed.

Replay a local fixture

mergewarden replay path/to/fixture

A fixture directory contains mergewarden.yml, fixture.json, and optionally pr-body.md. Replay is fully local and deterministic, with no network and no token. The repository's own fixtures live under fixtures/ and are not bundled in this package.

Run mergewarden --help for the complete command reference.

Security boundary

The policy comes from the pull request's base commit, never from the pull request itself. It does not check out either branch, evaluate workflow expressions, run package scripts, or call a model during analysis.

License: MIT. See THIRD_PARTY_NOTICES.md for bundled dependency notices.