Module server 

Minimal hand-rolled MCP JSON-RPC server over stdio.

This is the wave-3 skeleton. A future task may replace this with a more capable framework (e.g. rmcp). The protocol surface is small: newline-delimited JSON-RPC 2.0 over stdin/stdout.

Structs

RegisteredTool

ServerState

State carried by the server. Tools reach into this for the resolved browser endpoint and any cached engine clients.

ToolRegistry

Functions

run

Run the server using the real stdin/stdout.

run_with_streams

Run the server with injected I/O streams (used by tests).

Type Aliases

BidiCache

Persistent BiDi session, opened lazily on first use. Reused across all tool calls because Firefox limits concurrent BiDi sessions per browser to one.

ToolHandler

Handler signature: takes (state, params) and returns a tool result.