Specification Enhancement Proposals (SEPs)

Index of all MCP Specification Enhancement Proposals

Specification Enhancement Proposals (SEPs) are the primary mechanism for proposing major changes to the Model Context Protocol. Each SEP provides a concise technical specification and rationale for proposed features.

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Summary

• Final: 24

All SEPs

SEP	Title	Status	Type	Created
SEP-2133	Extensions		Standards Track	2025-01-21
SEP-2085	Governance Succession and Amendment Procedures		Process	2025-12-05
SEP-1865	MCP Apps - Interactive User Interfaces for MCP		Extensions Track	2025-11-21
SEP-1850	PR-Based SEP Workflow		Process	2025-11-20
SEP-1730	SDKs Tiering System		Standards Track	2025-10-29
SEP-1699	Support SSE polling via server-side disconnect		Standards Track	2025-10-22
SEP-1686	Tasks		Standards Track	2025-10-20
SEP-1613	Establish JSON Schema 2020-12 as Default Dialect for MCP		Standards Track	2025-10-06
SEP-1577	Sampling With Tools		Standards Track	2025-09-30
SEP-1330	Elicitation Enum Schema Improvements and Standards Compliance		Standards Track	2025-08-11
SEP-1319	Decouple Request Payload from RPC Methods Definition		Standards Track	2025-08-08
SEP-1303	Input Validation Errors as Tool Execution Errors		Standards Track	2025-08-05
SEP-1302	Formalize Working Groups and Interest Groups in MCP Governance		Standards Track	2025-08-05
SEP-1046	Support OAuth client credentials flow in authorization		Standards Track	2025-07-23
SEP-1036	URL Mode Elicitation for secure out-of-band interactions		Standards Track	2025-07-22
SEP-1034	Support default values for all primitive types in elicitation schemas		Standards Track	2025-07-22
SEP-1024	MCP Client Security Requirements for Local Server Installation		Standards Track	2025-07-22
SEP-994	Shared Communication Practices/Guidelines		Process	2025-07-17
SEP-991	Enable URL-based Client Registration using OAuth Client ID Metadata Documents		Standards Track	2025-07-07
SEP-990	Enable enterprise IdP policy controls during MCP OAuth flows		Standards Track	2025-06-04
SEP-986	Specify Format for Tool Names		Standards Track	2025-07-16
SEP-985	Align OAuth 2.0 Protected Resource Metadata with RFC 9728		Standards Track	2025-07-16
SEP-973	Expose additional metadata for Implementations, Resources, Tools and Prompts		Standards Track	2025-07-15
SEP-932	Model Context Protocol Governance		Process	2025-07-08

SEP Status Definitions

• - SEP proposal with a sponsor, undergoing informal review
• - SEP proposal ready for formal review by Core Maintainers
• - SEP accepted, awaiting reference implementation
• - SEP finalized with reference implementation complete
• - SEP rejected by Core Maintainers
• - SEP withdrawn by the author
• - SEP replaced by a newer SEP
• - SEP without a sponsor, closed after 6 months