Module protocol 

mcpr-protocol

MCP specification layer: JSON-RPC 2.0, MCP message taxonomy, schema capture primitives, and session lifecycle. Zero coupling to HTTP frameworks or proxy logic — this module describes what MCP is, not how mcpr proxies it.

Module layout

protocol/
+-- jsonrpc.rs         JSON-RPC 2.0 envelope, id, error, lazy typed views
+-- mcp.rs             MCP 2025-11-25 message taxonomy + classify_client/server
+-- schema.rs          Pagination merge/diff + is_schema_method
+-- schema_manager/    Per-upstream versioned schema snapshots
+-- session.rs         Session lifecycle, SessionStore trait, MemorySessionStore

Dependencies

Minimal: serde, serde_json, chrono, dashmap. No HTTP framework deps.

Modules

jsonrpc

Shallow JSON-RPC 2.0 envelope.

mcp

MCP message taxonomy (spec v2025-11-25).

schema

MCP schema capture: types, pagination merging, and diff logic.

schema_manager

Schema manager: the top-level per-upstream view of an MCP server.

session