The Type Server Protocol (TSP) defines a JSON-RPC interface for clients to obtain Python type-analysis data from a server that maintains analysis state for a workspace. It reuses useful Language Server Protocol conventions, including positions, ranges, and URI strings, while using methods prefixed with `typeServer/`. Its requests cover protocol-version checks, snapshots, Python search paths, import resolution, and computed, declared, and expected types. Semantic versions let clients and servers check compatibility; during the current 0.x series, minor-version changes may be breaking, while patch changes remain compatible within a minor line.
A typical session initializes shared workspace and document state, checks the server’s protocol version, obtains a snapshot identifier, then makes analysis requests against that view. Snapshots advance whenever changes could invalidate prior results, such as edits, configuration changes, or dependency updates; requests using stale snapshots should fail in a way that lets clients retry. Optional multi-connection mode allows concurrent, read-only requests over extra IPC channels, but the main connection retains all workspace updates, lifecycle traffic, and connection control. Client and server must negotiate a shared transport during initialization, and the server must also work without extra channels. Extra connections accept only version-approved, read-only TSP requests, and their results apply to the requested snapshot.
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