Specification Enhancement Proposals (SEPs) changedseps/index
Nearest release: v2.1.284, published 4 hours before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Recorded here
Lines+56added
Lines−54removed
From line
4
where the diff opens
First seen
14 Aug 2026
this site's first read of the page
Recorded edits4to this page, all time
The whole hunk
from line 4, old and new numbered
/
from line 4
44
55Specification 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.
66
7Each SEP is reachable by number at `/seps/<number>` (for example, [/seps/1850](/seps/1850)).
8
79<Card title="Submit a SEP" icon="file-plus" href="/community/sep-guidelines">
810 Learn how to submit your own Specification Enhancement Proposal
911</Card>
from line 16
1416
1517## All SEPs
1618
17| SEP | Title | Status | Type | Created |
18| ------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------- | ----------------------------------------------- | ---------------- | ---------- |
19| [SEP-2663](/seps/2663-tasks-extension) | Tasks Extension | <Badge color="green" shape="pill">Final</Badge> | Extensions Track | 2026-04-27 |
20| [SEP-2640](/seps/2640-skills-extension) | Skills Extension | <Badge color="green" shape="pill">Final</Badge> | Extensions Track | 2026-04-23 |
21| [SEP-2596](/seps/2596-spec-feature-lifecycle-and-deprecation) | Specification Feature Lifecycle and Deprecation Policy | <Badge color="green" shape="pill">Final</Badge> | Process | 2026-04-17 |
22| [SEP-2577](/seps/2577-deprecate-roots-sampling-and-logging) | Deprecate Roots, Sampling, and Logging | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-04-14 |
23| [SEP-2575](/seps/2575-stateless-mcp) | Make MCP Stateless | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-06-18 |
24| [SEP-2567](/seps/2567-sessionless-mcp) | Sessionless MCP via Explicit State Handles | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-03-11 |
25| [SEP-2549](/seps/2549-TTL-for-list-results) | TTL for List Results | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-04-09 |
26| [SEP-2484](/seps/2484-conformance-tests-required-for-final-seps) | Require Conformance Tests for Standards Track SEPs to Reach Final Status | <Badge color="green" shape="pill">Final</Badge> | Process | 2026-03-27 |
27| [SEP-2468](/seps/2468-recommend-issuer-claim-for-auth) | Recommend Issuer (iss) Parameter in MCP Auth Responses | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-03-25 |
28| [SEP-2322](/seps/2322-MRTR) | Multi Round-Trip Requests | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-02-03 |
29| [SEP-2260](/seps/2260-Require-Server-requests-to-be-associated-with-Client-requests) | Require Server requests to be associated with a Client request. | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-02-16 |
30| [SEP-2243](/seps/2243-http-standardization) | HTTP Header Standardization for Streamable HTTP Transport | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-02-04 |
31| [SEP-2207](/seps/2207-oidc-refresh-token-guidance) | OIDC-Flavored Refresh Token Guidance | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-02-04 |
32| [SEP-2164](/seps/2164-resource-not-found-error) | Standardize Resource Not Found Error Code | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-01-28 |
33| [SEP-2149](/seps/2149-working-group-charter-template) | MCP Group Governance and Charter Template | <Badge color="green" shape="pill">Final</Badge> | Process | 2025-01-15 |
34| [SEP-2148](/seps/2148-contributor-ladder) | MCP Contributor Ladder | <Badge color="green" shape="pill">Final</Badge> | Process | 2026-01-15 |
35| [SEP-2133](/seps/2133-extensions) | Extensions | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-01-21 |
36| [SEP-2106](/seps/2106-json-schema-2020-12) | Tools `inputSchema` & `outputSchema` Conform to JSON Schema 2020-12 | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-01-06 |
37| [SEP-2085](/seps/2085-governance-succession-and-amendment) | Governance Succession and Amendment Procedures | <Badge color="green" shape="pill">Final</Badge> | Process | 2025-12-05 |
38| [SEP-1865](/seps/1865-mcp-apps-interactive-user-interfaces-for-mcp) | MCP Apps - Interactive User Interfaces for MCP | <Badge color="green" shape="pill">Final</Badge> | Extensions Track | 2025-11-21 |
39| [SEP-1850](/seps/1850-pr-based-sep-workflow) | PR-Based SEP Workflow | <Badge color="green" shape="pill">Final</Badge> | Process | 2025-11-20 |
40| [SEP-1730](/seps/1730-sdks-tiering-system) | SDKs Tiering System | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-10-29 |
41| [SEP-1699](/seps/1699-support-sse-polling-via-server-side-disconnect) | Support SSE polling via server-side disconnect | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-10-22 |
42| [SEP-1686](/seps/1686-tasks) | Tasks | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-10-20 |
43| [SEP-1613](/seps/1613-establish-json-schema-2020-12-as-default-dialect-f) | Establish JSON Schema 2020-12 as Default Dialect for MCP | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-10-06 |
44| [SEP-1577](/seps/1577--sampling-with-tools) | Sampling With Tools | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-09-30 |
45| [SEP-1330](/seps/1330-elicitation-enum-schema-improvements-and-standards) | Elicitation Enum Schema Improvements and Standards Compliance | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-08-11 |
46| [SEP-1319](/seps/1319-decouple-request-payload-from-rpc-methods-definiti) | Decouple Request Payload from RPC Methods Definition | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-08-08 |
47| [SEP-1303](/seps/1303-input-validation-errors-as-tool-execution-errors) | Input Validation Errors as Tool Execution Errors | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-08-05 |
48| [SEP-1302](/seps/1302-formalize-working-groups-and-interest-groups-in-mc) | Formalize Working Groups and Interest Groups in MCP Governance | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-08-05 |
49| [SEP-1046](/seps/1046-support-oauth-client-credentials-flow-in-authoriza) | Support OAuth client credentials flow in authorization | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-23 |
50| [SEP-1036](/seps/1036-url-mode-elicitation-for-secure-out-of-band-intera) | URL Mode Elicitation for secure out-of-band interactions | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-22 |
51| [SEP-1034](/seps/1034--support-default-values-for-all-primitive-types-in) | Support default values for all primitive types in elicitation schemas | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-22 |
52| [SEP-1024](/seps/1024-mcp-client-security-requirements-for-local-server-) | MCP Client Security Requirements for Local Server Installation | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-22 |
53| [SEP-994](/seps/994-shared-communication-practicesguidelines) | Shared Communication Practices/Guidelines | <Badge color="green" shape="pill">Final</Badge> | Process | 2025-07-17 |
54| [SEP-991](/seps/991-enable-url-based-client-registration-using-oauth-c) | Enable URL-based Client Registration using OAuth Client ID Metadata Documents | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-07 |
55| [SEP-990](/seps/990-enable-enterprise-idp-policy-controls-during-mcp-o) | Enable enterprise IdP policy controls during MCP OAuth flows | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-06-04 |
56| [SEP-986](/seps/986-specify-format-for-tool-names) | Specify Format for Tool Names | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-16 |
57| [SEP-985](/seps/985-align-oauth-20-protected-resource-metadata-with-rf) | Align OAuth 2.0 Protected Resource Metadata with RFC 9728 | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-16 |
58| [SEP-973](/seps/973-expose-additional-metadata-for-implementations-res) | Expose additional metadata for Implementations, Resources, Tools and Prompts | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-15 |
59| [SEP-932](/seps/932-model-context-protocol-governance) | Model Context Protocol Governance | <Badge color="green" shape="pill">Final</Badge> | Process | 2025-07-08 |
60| [SEP-414](/seps/414-request-meta) | Document OpenTelemetry Trace Context Propagation Conventions | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-04-25 |
19| SEP | Title | Status | Type | Created |
20| - | - | - | - | - |
21| [SEP-2663](/seps/2663-tasks-extension) | Tasks Extension | <Badge color="green" shape="pill">Final</Badge> | Extensions Track | 2026-04-27 |
22| [SEP-2640](/seps/2640-skills-extension) | Skills Extension | <Badge color="green" shape="pill">Final</Badge> | Extensions Track | 2026-04-23 |
23| [SEP-2596](/seps/2596-spec-feature-lifecycle-and-deprecation) | Specification Feature Lifecycle and Deprecation Policy | <Badge color="green" shape="pill">Final</Badge> | Process | 2026-04-17 |
24| [SEP-2577](/seps/2577-deprecate-roots-sampling-and-logging) | Deprecate Roots, Sampling, and Logging | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-04-14 |
25| [SEP-2575](/seps/2575-stateless-mcp) | Make MCP Stateless | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-06-18 |
26| [SEP-2567](/seps/2567-sessionless-mcp) | Sessionless MCP via Explicit State Handles | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-03-11 |
27| [SEP-2549](/seps/2549-TTL-for-list-results) | TTL for List Results | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-04-09 |
28| [SEP-2484](/seps/2484-conformance-tests-required-for-final-seps) | Require Conformance Tests for Standards Track SEPs to Reach Final Status | <Badge color="green" shape="pill">Final</Badge> | Process | 2026-03-27 |
29| [SEP-2468](/seps/2468-recommend-issuer-claim-for-auth) | Recommend Issuer (iss) Parameter in MCP Auth Responses | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-03-25 |
30| [SEP-2322](/seps/2322-MRTR) | Multi Round-Trip Requests | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-02-03 |
31| [SEP-2260](/seps/2260-Require-Server-requests-to-be-associated-with-Client-requests) | Require Server requests to be associated with a Client request. | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-02-16 |
32| [SEP-2243](/seps/2243-http-standardization) | HTTP Header Standardization for Streamable HTTP Transport | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-02-04 |
33| [SEP-2207](/seps/2207-oidc-refresh-token-guidance) | OIDC-Flavored Refresh Token Guidance | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-02-04 |
34| [SEP-2164](/seps/2164-resource-not-found-error) | Standardize Resource Not Found Error Code | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-01-28 |
35| [SEP-2149](/seps/2149-working-group-charter-template) | MCP Group Governance and Charter Template | <Badge color="green" shape="pill">Final</Badge> | Process | 2025-01-15 |
36| [SEP-2148](/seps/2148-contributor-ladder) | MCP Contributor Ladder | <Badge color="green" shape="pill">Final</Badge> | Process | 2026-01-15 |
37| [SEP-2133](/seps/2133-extensions) | Extensions | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-01-21 |
38| [SEP-2106](/seps/2106-json-schema-2020-12) | Tools `inputSchema` & `outputSchema` Conform to JSON Schema 2020-12 | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2026-01-06 |
39| [SEP-2085](/seps/2085-governance-succession-and-amendment) | Governance Succession and Amendment Procedures | <Badge color="green" shape="pill">Final</Badge> | Process | 2025-12-05 |
40| [SEP-1865](/seps/1865-mcp-apps-interactive-user-interfaces-for-mcp) | MCP Apps - Interactive User Interfaces for MCP | <Badge color="green" shape="pill">Final</Badge> | Extensions Track | 2025-11-21 |
41| [SEP-1850](/seps/1850-pr-based-sep-workflow) | PR-Based SEP Workflow | <Badge color="green" shape="pill">Final</Badge> | Process | 2025-11-20 |
42| [SEP-1730](/seps/1730-sdks-tiering-system) | SDKs Tiering System | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-10-29 |
43| [SEP-1699](/seps/1699-support-sse-polling-via-server-side-disconnect) | Support SSE polling via server-side disconnect | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-10-22 |
44| [SEP-1686](/seps/1686-tasks) | Tasks | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-10-20 |
45| [SEP-1613](/seps/1613-establish-json-schema-2020-12-as-default-dialect-f) | Establish JSON Schema 2020-12 as Default Dialect for MCP | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-10-06 |
46| [SEP-1577](/seps/1577--sampling-with-tools) | Sampling With Tools | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-09-30 |
47| [SEP-1330](/seps/1330-elicitation-enum-schema-improvements-and-standards) | Elicitation Enum Schema Improvements and Standards Compliance | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-08-11 |
48| [SEP-1319](/seps/1319-decouple-request-payload-from-rpc-methods-definiti) | Decouple Request Payload from RPC Methods Definition | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-08-08 |
49| [SEP-1303](/seps/1303-input-validation-errors-as-tool-execution-errors) | Input Validation Errors as Tool Execution Errors | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-08-05 |
50| [SEP-1302](/seps/1302-formalize-working-groups-and-interest-groups-in-mc) | Formalize Working Groups and Interest Groups in MCP Governance | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-08-05 |
51| [SEP-1046](/seps/1046-support-oauth-client-credentials-flow-in-authoriza) | Support OAuth client credentials flow in authorization | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-23 |
52| [SEP-1036](/seps/1036-url-mode-elicitation-for-secure-out-of-band-intera) | URL Mode Elicitation for secure out-of-band interactions | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-22 |
53| [SEP-1034](/seps/1034--support-default-values-for-all-primitive-types-in) | Support default values for all primitive types in elicitation schemas | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-22 |
54| [SEP-1024](/seps/1024-mcp-client-security-requirements-for-local-server-) | MCP Client Security Requirements for Local Server Installation | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-22 |
55| [SEP-994](/seps/994-shared-communication-practicesguidelines) | Shared Communication Practices/Guidelines | <Badge color="green" shape="pill">Final</Badge> | Process | 2025-07-17 |
56| [SEP-991](/seps/991-enable-url-based-client-registration-using-oauth-c) | Enable URL-based Client Registration using OAuth Client ID Metadata Documents | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-07 |
57| [SEP-990](/seps/990-enable-enterprise-idp-policy-controls-during-mcp-o) | Enable enterprise IdP policy controls during MCP OAuth flows | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-06-04 |
58| [SEP-986](/seps/986-specify-format-for-tool-names) | Specify Format for Tool Names | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-16 |
59| [SEP-985](/seps/985-align-oauth-20-protected-resource-metadata-with-rf) | Align OAuth 2.0 Protected Resource Metadata with RFC 9728 | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-16 |
60| [SEP-973](/seps/973-expose-additional-metadata-for-implementations-res) | Expose additional metadata for Implementations, Resources, Tools and Prompts | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-07-15 |
61| [SEP-932](/seps/932-model-context-protocol-governance) | Model Context Protocol Governance | <Badge color="green" shape="pill">Final</Badge> | Process | 2025-07-08 |
62| [SEP-414](/seps/414-request-meta) | Document OpenTelemetry Trace Context Propagation Conventions | <Badge color="green" shape="pill">Final</Badge> | Standards Track | 2025-04-25 |
6163
6264## SEP Status Definitions
6365
64| Status | Definition |
65| ----------------------------------------------------- | -------------------------------------------------------- |
66| <Badge color="gray" shape="pill">Draft</Badge> | SEP proposal with a sponsor, undergoing informal review |
67| <Badge color="yellow" shape="pill">In-Review</Badge> | SEP proposal ready for formal review by Core Maintainers |
68| <Badge color="blue" shape="pill">Accepted</Badge> | SEP accepted, awaiting reference implementation |
69| <Badge color="green" shape="pill">Final</Badge> | SEP finalized with reference implementation complete |
70| <Badge color="red" shape="pill">Rejected</Badge> | SEP rejected by Core Maintainers |
71| <Badge color="red" shape="pill">Withdrawn</Badge> | SEP withdrawn by the author |
72| <Badge color="purple" shape="pill">Superseded</Badge> | SEP replaced by a newer SEP |
73| <Badge color="orange" shape="pill">Dormant</Badge> | SEP without a sponsor, closed after 6 months |
66| Status | Definition |
67| - | - |
68| <Badge color="gray" shape="pill">Draft</Badge> | SEP proposal with a sponsor, undergoing informal review |
69| <Badge color="yellow" shape="pill">In-Review</Badge> | SEP proposal ready for formal review by Core Maintainers |
70| <Badge color="blue" shape="pill">Accepted</Badge> | SEP accepted, awaiting reference implementation |
71| <Badge color="green" shape="pill">Final</Badge> | SEP finalized with reference implementation complete |
72| <Badge color="red" shape="pill">Rejected</Badge> | SEP rejected by Core Maintainers |
73| <Badge color="red" shape="pill">Withdrawn</Badge> | SEP withdrawn by the author |
74| <Badge color="purple" shape="pill">Superseded</Badge> | SEP replaced by a newer SEP |
75| <Badge color="orange" shape="pill">Dormant</Badge> | SEP without a sponsor, closed after 6 months |
7476
No line in this hunk matches that.