MCPNews

The Model Context Protocol ecosystem, verified

Current spec 2026-07-28

MCP 2024-11-05

SUPERSEDED Confidence: High (1.00)

MCP 2024-11-05 is a superseded revision of the Model Context Protocol specification, released 2024-11-05.

What is MCP specification revision 2024-11-05?

MCP 2024-11-05 is a superseded revision of the Model Context Protocol specification, released 2024-11-05.

The initial release of the Model Context Protocol specification: JSON-RPC 2.0 messages over stateful connections with capability negotiation, server features (resources, prompts, tools), the client sampling feature, and utilities for progress, cancellation, and logging.

What changed in MCP 2024-11-05?

  • Initial protocol release
  • JSON-RPC 2.0 message format over stateful connections with client/server capability negotiation
  • Server features: resources, prompts, tools
  • Client feature: sampling (server-initiated LLM interactions)
  • Utilities: progress tracking, cancellation, error reporting, logging

MCP 2024-11-05 is the first published revision of the Model Context Protocol specification. It defined the protocol as JSON-RPC 2.0 over stateful connections, with hosts, clients, and servers negotiating capabilities at connection time, and established the core primitives that every later revision builds on: resources, prompts, and tools on the server side, and sampling on the client side.

How was this verified, and what are the sources?

Verified · method: spec-changelog · confidence 1.00 (High).

  1. Official specification page for the 2024-11-05 revision - defines the base protocol, features, and security principles - accessed