github-pr-review-agent

Autonomous GitHub / Bitbucket PR review agent. Given a PR URL it clones the repo, runs a Claude Code review inside a claude-yolo container, and posts the result back as a PR review with a verdict (approve / request-changes).

Part of the bborbe agent-maintenance fleet: the shared library lives in bborbe/maintainer (imported as github.com/bborbe/maintainer), the Helm chart ships there too, and the published image is docker.io/bborbe/github-pr-review-agent. Extracted from the former bborbe/maintainer monorepo (agent/pr-reviewer).

How it works

1. Parse the PR URL → platform (GitHub / Bitbucket), owner, repo, PR number.
2. Fetch PR metadata (source + target branch) via the platform REST API.
3. Clone the repo at the PR head into a scratch dir.
4. Run the Claude Code review (/pr-review <target-branch>) inside the claude-yolo container against the diff.
5. Parse the JSON verdict from the review output.
6. Post a structured review — APPROVE / REQUEST_CHANGES (gated by autoApprove) or a plain COMMENT — and clean up the clone.

Run modes

Mode	Entry	Use
Kubernetes Job	main.go (/main in the image)	Env-driven; spawned by the agent-task-executor from a Kafka task. This is how it runs in production.
Local CLI	cmd/run-task	Reads a task file (--task-file), runs --phase, writes result back to the same file. --skip-post suppresses GitHub writes.
Local review	cmd/cli	Takes a PR URL positional arg; --comment-only posts a COMMENT without auto-approve gate. For local runs / debugging.

go run ./cmd/run-task --task-file=/path/to/task.md --phase=execution --skip-post
go run ./cmd/cli --comment-only https://github.com/owner/repo/pull/42

Configuration

Env-driven (Kubernetes) — key variables:

Var	Purpose
APP_ID / INSTALLATION_ID	GitHub App identity (Ben's Pull Request Reviewer)
PEM_KEY	GitHub App private key (mounted from a Secret)
REPO_ALLOWLIST	Repos the agent may review (e.g. github.com/bborbe/*,!github.com/bborbe/go-skeleton)
BOT_GITHUB_LOGIN	The App's bot login, used to detect its own prior reviews
REVIEW_MODE	Review depth (e.g. selector)
BITBUCKET_TOKEN	Bitbucket Server bearer token (Bitbucket PRs only)

Per-repo behavior is driven by the target repo's .maintainer.yaml (prReviewer.autoApprove) — read from the PR head. See bborbe/maintainer for that schema.

Verdict contract

The Claude Code review must emit a JSON block:

{"verdict": "approve|request-changes", "reason": "<one-liner>"}

Fallback: a heuristic section-header scan (## Must Fix, ## Blocking). Horizontal rules (---) are not treated as must-fix content.

Smoke-test PR

bborbe/maintainer#2 — test: delete-this-pr-never. Permanent test fixture (trivial diff). Use it for any local or k8s smoke test. Do not close, do not merge.

Layout

.                    lib imported from github.com/bborbe/maintainer
├── main.go          Kubernetes Job entry (env-driven; /main in the image)
├── cmd/
│   ├── run-task/    local CLI (task-file driven, --skip-post available)
│   ├── cli/         PR URL driven local review CLI
│   └── mint-iat/    GitHub App installation-token smoke tool
├── pkg/             URL parse, config, git clone, GitHub/Bitbucket clients,
│                    App auth, review runner, verdict parser, posters
├── docs/            architecture.md · github-app-setup.md · pr-post-back.md
└── helm chart + shared lib live in bborbe/maintainer

See docs/architecture.md for the three-phase design (planning → execution → review) and the verdict rubric, and docs/github-app-setup.md for the App auth flow.

Build

make precommit          # fmt, generate, test, lint, vet, vuln, license
VERSION=vX.Y.Z make buca # build + push docker.io/bborbe/github-pr-review-agent:vX.Y.Z