AT Protocol

This repository contains Bluesky's reference implementation of AT Protocol, and of the app.bsky microblogging application service backend. Lexicons: for both the com.atproto. and app.bsky. are canonically versioned in this repo, for now, under ./lexicons/ . These are JSON files in the Lexicon schema definition language, similar to JSON Schema or OpenAPI. Interoperability Test Data: the language-neutral test files in ./interop-test-files/ may be useful for other protocol implementations to ensure that they follow the specification correctly The source code for the Bluesky Social client app (for web and mobile) can be found at bluesky-social/social-app. Go programming language source code is in bluesky-social/indigo, including the BGS implementation. We recommend nvm for managing Node.js installs. This project requires Node.js version 22 or later. pnpm is used to manage the workspace of multiple packages. You can install it with npm install --global pnpm . The Authenticated Transfer Protocol ("ATP" or "atproto") is a decentralized social media protocol, developed by Bluesky Social PBC. Learn more at: Overview and Guides 👈 Best starting point Github Discussions 👈 Great place to ask questions Protocol Specifications Blogpost on self-authenticating data structures The Bluesky Social application encompasses a set of schemas and APIs built in the overall AT Protocol framework. The namespace for these "Lexicons" is app.bsky. . While we do accept contributions, we prioritize high quality issues and pull requests. Adhering to the below guidelines will ensure a more timely review. Guidelines: Check for existing issues before filing a new one, please. Open an issue and give some time for discussion before submitting a PR. If submitting a PR that includes a lexicon change, please get sign off on the lexicon change before doing the implementation. Issues are for bugs & feature requests related to the TypeScript implementation of atproto and related services. For high-level discussions, please use the Discussion Forum. For client issues, please use the relevant social-app repo. Stay away from PRs that: Refactor large parts of the codebase Add entirely new features without prior discussion Change the tooling or frameworks used without prior discussion Introduce new unnecessary dependencies Remember, we serve a wide community of users. Our day-to-day involves us constantly asking "which top priority is our top priority." If you submit well-written PRs that solve problems concisely, that's an awesome contribution. Otherwise, as much as we'd love to accept your ideas and contributions, we really don't have the bandwidth. Bluesky is an open social network built on the AT Protocol, a flexible technology that will never lock developers out of the ecosystems that they help build. With atproto, third-party can be as seamless as first-party through custom feeds, federated services, clients, and more. If you discover any security issues, please send an email to [email protected]. The email is automatically CCed to the entire team, and we'll respond promptly. See SECURITY.md for more info. This project is dual-licensed under MIT and Apache 2.0 terms: MIT license (LICENSE-MIT.txt or Apache License, Version 2.0, (LICENSE-APACHE.txt or Downstream projects and end users may chose either license individually, or both together, at their discretion. The motivation for this dual-licensing is the additional software patent assurance provided by Apache 2.0. Bluesky Social PBC has committed to a software patent non-aggression pledge. For details see the original announcement.