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Documentation Index

Fetch the complete documentation index at: https://modelcontextprotocol.io/llms.txt Use this file to discover all available pages before exploring further.

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.

Learn how to submit your own Specification Enhancement Proposal

Summary

  • Final: 41

All SEPs

SEPTitleStatusTypeCreated
SEP-2663Tasks ExtensionFinalExtensions Track2026-04-27
SEP-2596Specification Feature Lifecycle and Deprecation PolicyFinalProcess2026-04-17
SEP-2577Deprecate Roots, Sampling, and LoggingFinalStandards Track2026-04-14
SEP-2575Make MCP StatelessFinalStandards Track2025-06-18
SEP-2567Sessionless MCP via Explicit State HandlesFinalStandards Track2026-03-11
SEP-2549TTL for List ResultsFinalStandards Track2026-04-09
SEP-2484Require Conformance Tests for Standards Track SEPs to Reach Final StatusFinalProcess2026-03-27
SEP-2468Recommend Issuer (iss) Parameter in MCP Auth ResponsesFinalStandards Track2026-03-25
SEP-2322Multi Round-Trip RequestsFinalStandards Track2026-02-03
SEP-2260Require Server requests to be associated with a Client request.FinalStandards Track2026-02-16
SEP-2243HTTP Header Standardization for Streamable HTTP TransportFinalStandards Track2026-02-04
SEP-2207OIDC-Flavored Refresh Token GuidanceFinalStandards Track2026-02-04
SEP-2164Standardize Resource Not Found Error CodeFinalStandards Track2026-01-28
SEP-2149MCP Group Governance and Charter TemplateFinalProcess2025-01-15
SEP-2148MCP Contributor LadderFinalProcess2026-01-15
SEP-2133ExtensionsFinalStandards Track2025-01-21
SEP-2106Tools inputSchema & outputSchema Conform to JSON Schema 2020-12FinalStandards Track2026-01-06
SEP-2085Governance Succession and Amendment ProceduresFinalProcess2025-12-05
SEP-1865MCP Apps - Interactive User Interfaces for MCPFinalExtensions Track2025-11-21
SEP-1850PR-Based SEP WorkflowFinalProcess2025-11-20
SEP-1730SDKs Tiering SystemFinalStandards Track2025-10-29
SEP-1699Support SSE polling via server-side disconnectFinalStandards Track2025-10-22
SEP-1686TasksFinalStandards Track2025-10-20
SEP-1613Establish JSON Schema 2020-12 as Default Dialect for MCPFinalStandards Track2025-10-06
SEP-1577Sampling With ToolsFinalStandards Track2025-09-30
SEP-1330Elicitation Enum Schema Improvements and Standards ComplianceFinalStandards Track2025-08-11
SEP-1319Decouple Request Payload from RPC Methods DefinitionFinalStandards Track2025-08-08
SEP-1303Input Validation Errors as Tool Execution ErrorsFinalStandards Track2025-08-05
SEP-1302Formalize Working Groups and Interest Groups in MCP GovernanceFinalStandards Track2025-08-05
SEP-1046Support OAuth client credentials flow in authorizationFinalStandards Track2025-07-23
SEP-1036URL Mode Elicitation for secure out-of-band interactionsFinalStandards Track2025-07-22
SEP-1034Support default values for all primitive types in elicitation schemasFinalStandards Track2025-07-22
SEP-1024MCP Client Security Requirements for Local Server InstallationFinalStandards Track2025-07-22
SEP-994Shared Communication Practices/GuidelinesFinalProcess2025-07-17
SEP-991Enable URL-based Client Registration using OAuth Client ID Metadata DocumentsFinalStandards Track2025-07-07
SEP-990Enable enterprise IdP policy controls during MCP OAuth flowsFinalStandards Track2025-06-04
SEP-986Specify Format for Tool NamesFinalStandards Track2025-07-16
SEP-985Align OAuth 2.0 Protected Resource Metadata with RFC 9728FinalStandards Track2025-07-16
SEP-973Expose additional metadata for Implementations, Resources, Tools and PromptsFinalStandards Track2025-07-15
SEP-932Model Context Protocol GovernanceFinalProcess2025-07-08
SEP-414Document OpenTelemetry Trace Context Propagation ConventionsFinalStandards Track2025-04-25

SEP Status Definitions

StatusDefinition
DraftSEP proposal with a sponsor, undergoing informal review
In-ReviewSEP proposal ready for formal review by Core Maintainers
AcceptedSEP accepted, awaiting reference implementation
FinalSEP finalized with reference implementation complete
RejectedSEP rejected by Core Maintainers
WithdrawnSEP withdrawn by the author
SupersededSEP replaced by a newer SEP
DormantSEP without a sponsor, closed after 6 months

Last updated Oct 08, 2026