Overview
Format version: 0.8.0 · Status: stable · Date: September 9, 2026
About this release
Section titled “About this release”MCP Description v0.8 adds support for MCP 2026-07-28, multi-protocol descriptions,
extensions and client requirements, reusable security schemes, richer examples and
interactions, reusable components, and stronger serialization and semantic conformance.
Source and schema
Section titled “Source and schema”- Canonical specification -
spec/0.8.0/mcp-description.md - Release source -
v0.8.0 - Release notes -
v0.8.0 - Immutable JSON Schema -
0.8.0.json - Migration guide - Migrate from 0.7 to 0.8
- Feedback - Report an interoperability issue
For AI assistants and tools
Section titled “For AI assistants and tools”- Complete specification, single file -
/specification/0.8.0/mcpdesc.md - Version index -
/specification/index.json, including explicitstableandcandidatefields and the compatiblelatestandnextaliases
Sections
Section titled “Sections”- Introduction
- Terminology
- Document Structure
- Versioning
- Info Object
- Transports
- Security
- Capabilities
- Tools
- Resources and Resource Templates
- Prompts
- Elicitation Declarations
- Tags
- Specification Extensions
- Serialization
- Conformance
- Reusable Components and Local References
See also the appendices, examples, and cross-version changelog.