Guides
Protocol Overview Start here
An introduction to the AT Protocol.
Identity
How the AT Protocol handles user identity.
Data Repositories
A guide to the AT Protocol repo structure.
Lexicon
A schema-driven interoperability framework
Applications
How applications work on the AT Protocol.
FAQ
Frequently Asked Questions about ATP
Specs
ATP
The specification for the Authenticated Transfer Protocol (aka "AT Protocol").
URI Scheme
A URI scheme for addressing ATP repository data.
Lexicon Schemas
A schemas format and distribution network.
Repository
Self-authenticating storage for public account content
XRPC
Cross-system remote procedure calls.
NSID
A specification for global semantic IDs.
Record Key
Identifier for individual records in a collection
DID:Placeholder
A hosted, secure registry of user DIDs.
Handle
A specification for human-friendly account identifiers.
Lexicons
com.atproto.admin
ATP Lexicon - Admin Schemas
com.atproto.identity
ATP Lexicon - Identity Schemas
com.atproto.label
ATP Lexicon - Label Schemas
com.atproto.moderation
ATP Lexicon - Moderation Schemas
com.atproto.repo
ATP Lexicon - Repo Schemas
com.atproto.server
ATP Lexicon - Server Schemas
com.atproto.sync
ATP Lexicon - Sync Schemas
app.bsky.actor
Bluesky Lexicon - Actor Schemas
app.bsky.embed
Bluesky Lexicon - Embed Schemas
app.bsky.feed
Bluesky Lexicon - Feed Schemas
app.bsky.graph
Bluesky Lexicon - Graph Schemas
app.bsky.notification
Bluesky Lexicon - Notification Schemas
app.bsky.richtext
Bluesky Lexicon - Richtext Schemas