Building on top of AI context infrastructure requires reverse-engineering internal protocols.
The LeanCTX SDK provides a typed TypeScript client for the full Context OS API. Call any tool, subscribe to events, mutate sessions, and query knowledge — all through a clean, documented interface. The same API is available as REST endpoints for any language.
No Public Interface
You want to build a dashboard, a CI integration, or a custom agent orchestrator. But the only interface is an internal MCP protocol designed for IDE consumption, not programmatic access.
Connect to the Context OS and subscribe to workspace events with just a few lines of TypeScript.
4 tools
TypeScript Client
Fully typed client library with async iterators for event streams, workspace/channel headers, and error handling.
Event Subscription
Subscribe to versioned events with automatic reconnection, backfill on lag, consistency levels, and typed ContextEventV1 payloads including version, parentId, and consistencyLevel.
REST API
Every tool and endpoint available as REST. JSON request/response with typed errors and rate limiting.
Token Authentication
Team tokens with configurable scopes. SHA-256 hashed, config-driven issuance via lean-ctx team token create.
0 MCP tools
The LeanCTX SDK provides a typed TypeScript client for the full Context OS API. Call any tool, subscribe to events, mutate sessions, and query knowledge — all through a clean, documented interface. The same API is available as REST endpoints for any language.
Every output carries proof
LeanCTX generates proof artifacts for every session: which files were read, what was compressed, which checks passed, and how tokens were spent. This makes AI work auditable, replayable, and trustworthy.
Explore SDK & API
The LeanCTX SDK provides a typed TypeScript client for the full Context OS API. Call any tool, subscribe to events, mutate sessions, and query knowledge — all through a clean, documented interface. The same API is available as REST endpoints for any language.