App
community.lexicon.app
Self-published app profiles and community listings: how apps declare what they are and which lexicons they speak.
Lexicon Community
A working group that stewards a shared namespace for AT Protocol schemas: built in the open, governed collectively, and free for anyone to use.
01 · About
What is Lexicon Community?
Lexicon Community is a volunteer-run working group that creates and maintains community AT Protocol Lexicons.
Lexicons
are the schema definitions that give AT Protocol records their
shape: they describe the types, methods, and constraints
that applications share across the network. Most lexicons today
live under vendor-controlled namespaces like
app.bsky.*. Lexicon Community offers a neutral home:
schemas that no single company owns, governed by an open
Technical Steering Committee and published under the MIT license.
- Neutral home
- Schemas the community publishes are not tied to any single product or company.
- Open governance
- A Technical Steering Committee of seven members stewards the namespace, with all decisions made in public.
- Working-group model
- New lexicons are developed by small, focused working groups and reviewed openly before merge.
- MIT licensed
- Every schema, reference, and governance document is free to use, fork, and remix.
Technical Steering Committee
- Boris Mann
- @bmann.ca
- Ms Boba
- @essentialrandom.bsky.social
- Nick Gerakines
- @ngerakines.me
- Rudy Fraser
- @rude1.blacksky.team
- Ryan Barrett
- @snarfed.org
- Tom Sherman
- @tom.sherman.is
- Bluesky, PBC
- @bsky.app
Next meeting
Thursday, August 6, 2026 at 1:00 PM ET, open to the community: RSVP on atmo.rsvp or read the announcement.
02 · Schemas
Lexicons
These namespaces are developed openly in the lexicons repository. The full directory of published schemas, with documentation for each, lives at Lexicons.
Bookmarks
community.lexicon.bookmarks
Save and retrieve bookmarks: a portable, protocol-native alternative to siloed read-later services.
Calendar
community.lexicon.calendar
Events and RSVPs for the open social web: a shared schema for everything from meetups to conferences.
Interaction
community.lexicon.interaction
Generic interaction primitives that apps can share, starting with a reusable like record.
Location
community.lexicon.location
Represent places with multiple encodings: street addresses, geo coordinates, H3 cells, and Foursquare POIs.
Payments
community.lexicon.payments
Payment-adjacent primitives for open social apps, starting with a Web Monetization declaration.
Preference
community.lexicon.preference
User-declared preferences, starting with how AI may use your public data.
Your lexicon here
community.lexicon.…
Have an idea for a new namespace? Working groups are self-formed: anyone can start one. Bring the idea to the forum, along with the application that would use it.
03 · Contribute
How to get involved
Ideas start on the forum. Lead with the application, SDK, or tool you want to interoperate with. Working groups are self-formed, changes land as pull requests, and the Technical Steering Committee approves them once the work is done.
The full path, end to end, is written down in the design guide on the blog.