Infrastructure-as-Effects — cloud infrastructure and application logic as a single, type-safe Effect program.

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A Worker bound to a R2 bucket and serving objects from it:

const Bucket = Cloudflare.R2.Bucket("bucket");

export default Cloudflare.Worker(
  "api",
  { main: import.meta.url },
  Effect.gen(function* () {
    const bucket = yield* Cloudflare.R2.ReadWriteBucket(Bucket);
    return {
      fetch: Effect.gen(function* () {
        const request = yield* HttpServerRequest;
        const object = yield* bucket.get(request.url);
        return HttpServerResponse.stream(object!.body);
      })
    };
  }).pipe(Effect.provide(Cloudflare.R2.ReadWriteBucketBinding)),
);

One ReadWriteBucket(Bucket) call wires the binding, env var, and typed client — at deploy time and at runtime.

• One program, one language. Resources, Lambdas/Workers, IAM, and SDKs live in the same Effect program — no YAML, no second runtime.
• Bindings, not glue code. S3.GetObject(bucket) wires the IAM policy, env var, and a typed SDK call in a single line.
• Errors in the type system. Every cloud API failure is a tagged Effect error you handle — or don't — on purpose.
• AWS + Cloudflare today. S3, SQS, DynamoDB, Kinesis, Lambda, EC2 / Workers, R2, D1, Durable Objects, Containers.
• Same code, every stage. Local dev, plan / deploy, smoke tests, and CI all share one mental model.

bun add alchemy@latest effect@rc

GitHub Action

Use the root action to deploy prod from main, deploy PR previews as staging-{number}, and destroy PR previews when the PR closes:

- uses: alchemy-run/alchemy@v1
  env:
    CLOUDFLARE_ACCOUNT_ID: ${{ vars.CLOUDFLARE_ACCOUNT_ID }}
    CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

The workflow must install the alchemy CLI before this action runs.

Bootstrap with an AI coding agent

Paste this into Claude Code, Cursor, or any agent that can fetch a URL:

You are an Alchemy expert. Read https://alchemy.run/llms.txt to load the
full documentation index, then act as my pair on this project.

Goal: help me set up, build, test, and deploy a cloud application with
`alchemy` (Infrastructure-as-Effects, powered by Effect).

Follow the patterns from the docs and the /examples folder. Stay idiomatic
to Effect: use Layers for wiring, return Effects from lifecycle code, and
keep infra and runtime in the same program. Ask before introducing new
dependencies or breaking conventions.

Learn more

• What is Alchemy? — the framework in 2 minutes
• Getting Started — your first Stack
• Tutorial — five-part walkthrough to a tested, CI-deployed app
• Examples — runnable projects on AWS and Cloudflare
• llms.txt — agent-ready documentation index

alchemy is in alpha. Expect breaking changes. Come hang in our Discord.

License

Licensed under the Apache License 2.0. See Third-Party Licenses for code incorporated from upstream projects.