Lexicon Garden
Browse and discover ATProtocol lexicon schema definitions
https://lexicon.garden/Opens ChatGPT on the web or desktop and asks it to use the WebMCP tools available here.
Connect straight to this server’s public endpoint.
https://lexicon.garden/mcpWe add this server to your workspace, then open Studio — saved access, one connection to many servers, with a history of what ran.
Last probed Sep 14, 2026 · lexicon.garden
6tools discovered
Describe Lexicon
Get detailed information about an ATProtocol lexicon schema, including its definition and usage examples. Use this to understand the structure and format of XRPC methods, records, and other lexicon types.
Create Record Cid
Generate a CID (Content Identifier) for an AT Protocol record. Uses DAG-CBOR encoding and SHA-256 hashing to create a deterministic content identifier, following AT Protocol conventions.
Facet Text
Parse rich text facets (mentions, URLs, and hashtags) from plain text. Returns AT Protocol facets with correct UTF-8 byte offsets. Mentions are resolved to DIDs when possible.
Validate Lexicon
Validate a lexicon schema and optionally validate data against it. Use this to verify schema correctness and validate records, query params, or procedure inputs against their schemas.
Check Compatibility
Check compatibility between two versions of an ATProtocol lexicon schema. Detects breaking vs non-breaking changes and provides migration guidance. Supply either two schema JSON objects directly (from_schema + to_schema), or an NSID with two CIDs to compare stored versions (nsid + from_cid + to_cid).
Discover Permission Sets
Discover which ATProtocol permission-set lexicon schemas cover a given set of collections and/or XRPC methods. Returns matching permission sets with their OAuth scope strings (`include:<nsid>`), useful for determining what OAuth scopes an application needs.
Get your MCP into directories
A working endpoint is step one. Directory coverage is the coordinated launch across ChatGPT, Claude, Cursor, the MCP Registry, and community indexes.
Directory coverage for brandsBrowse and discover ATProtocol lexicon schema definitions
Use the MCP endpoint listed on this page in your MCP client configuration. One-click install pills support Claude, Cursor, VS Code, and other hosts. Copy the remote MCP URL if your client needs a manual entry.
MCPBundles probed 6 tools on the live server. The tool list on this page reflects what was discovered at the last refresh — connect your client to see the full set available to your session.
No provider sign-in was required during MCPBundles' probe. Your client may still need MCPBundles credentials depending on how you connect.
Operate Lexicon Garden? Verify ownership to take over this directory entry.
This server appears in the MCPBundles directory. Verify you operate it to take over the listing — name, description, logo, contact email, and skill content. We email a 6-digit code to a maintainer address your server publishes in /.well-known/security.txt or /.well-known/mcpbundles.json. Free, takes about a minute.