Buildkite Self-Healing Pipeline Example

This example demonstrates a self-healing pipeline built with Buildkite dynamic pipelines and Claude Code. When a PR build fails, adding a label triggers an AI agent that automatically diagnoses the failure and submits a fix.

How it works

1. You add a buildkite-fix label to a GitHub PR that has a failing build
2. GitHub sends a webhook to Buildkite, which starts a build
3. The first step evaluates the webhook payload — if it’s not a label event, the build exits early
4. A TypeScript handler reads the payload, finds the failed build via the Buildkite REST API, and checks that the failure matches the PR’s head commit
5. If there’s a matching failure, the handler uses the Buildkite SDK to dynamically generate a new pipeline step and uploads it with buildkite-agent pipeline upload
6. That step launches Claude Code in a Docker container with access to the repo, the failed build logs (via the Buildkite MCP server), and GitHub (via gh CLI)
7. Claude reads the logs, diagnoses the issue, creates a fix on a new branch, opens a PR, and verifies it passes CI

The handler pattern

The core of the handler is short — read the webhook payload from build metadata, evaluate whether to act, and generate a step with the Buildkite SDK:

// 1. Read the webhook payload that Buildkite stored as build metadata
const payload = JSON.parse(
  execSync("buildkite-agent meta-data get buildkite:webhook").toString(),
);

// 2. Evaluate the condition — right event, right label?
if (payload.action !== "labeled" || payload.label.name !== process.env.TRIGGER_ON_LABEL) {
  process.exit(0);
}

// 3. Generate a step with the Buildkite SDK and pipe it into `pipeline upload`
const pipeline = new Pipeline();
pipeline.addStep({ label: ":robot_face: Fix the build", command: "scripts/claude.sh" });
execSync("buildkite-agent pipeline upload", { input: pipeline.toYAML() });

The real handler also calls the Buildkite API between steps 2 and 3 to confirm there’s an actual failing build on the PR’s head commit — see scripts/handler.ts.

The key Buildkite features at play:

• buildkite-agent pipeline upload — adding steps to a running build based on runtime conditions
• buildkite-agent meta-data — reading webhook payloads stored as build metadata
• @buildkite/buildkite-sdk — programmatically generating pipeline YAML in TypeScript
• Buildkite webhooks — triggering builds from external events
• Buildkite Hosted Models — proxying LLM requests through Buildkite’s model provider endpoint

What’s interesting about this?

This pipeline doesn’t have a fixed set of steps. Whether anything happens at all depends on the webhook payload and the state of the builds at that moment. That’s the core idea behind dynamic pipelines — your pipeline logic runs at build time and decides what to do based on real conditions, not static YAML.

The self-healing use case takes this further: the pipeline not only decides whether to act, it decides what to do by handing the problem to an AI agent. This is one pattern for building agentic CI/CD workflows on Buildkite.

Setup

To run this yourself, you’ll need:

• A Buildkite account
• A GitHub repository with a Buildkite pipeline configured to receive webhooks
• A Buildkite API token with read access to builds
• An Anthropic API key (or use Buildkite Hosted Models to proxy requests)
• Docker installed on your Buildkite agent (the Claude Code toolchain runs in a container)

1. Fork this repo
2. Create a Buildkite pipeline pointing to your fork with webhook support enabled
3. Configure a GitHub webhook to send pull_request events with the labeled action to Buildkite
4. Set up the required secrets in your Buildkite pipeline: GITHUB_TOKEN and BUILDKITE_API_TOKEN
5. Add the buildkite-fix label to a PR with a failing build and watch it go

Known limitations

• The handler assumes the Buildkite org slug and pipeline slug match the GitHub org and repo name. This won’t always be the case — you may need to configure these separately.

Credits

Originally built by Grant Colegate and Christian Nunciato as a demo for AWS re:Invent.

License

See LICENSE (MIT)