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Title: SEP-2127: MCP Server Cards - HTTP Server Discovery via .well-known by dsp-ant · Pull Request #2127 · modelcontextprotocol/modelcontextprotocol · GitHub

Open Graph Title: SEP-2127: MCP Server Cards - HTTP Server Discovery via .well-known by dsp-ant · Pull Request #2127 · modelcontextprotocol/modelcontextprotocol

X Title: SEP-2127: MCP Server Cards - HTTP Server Discovery via .well-known by dsp-ant · Pull Request #2127 · modelcontextprotocol/modelcontextprotocol

Description: Specification and documentation for the Model Context Protocol - SEP-2127: MCP Server Cards - HTTP Server Discovery via .well-known by dsp-ant · Pull Request #2127 · modelcontextprotocol/modelcontextprotocol

Open Graph Description: This SEP proposes adding a standardized discovery mechanism for HTTP-based MCP servers using a .well-known/mcp.json endpoint. Moved from: #1649 Summary This enables clients to automatically discove...

X Description: This SEP proposes adding a standardized discovery mechanism for HTTP-based MCP servers using a .well-known/mcp.json endpoint. Moved from: #1649 Summary This enables clients to automatically discove...

Opengraph URL: https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127

X: @github

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og:image:altThis SEP proposes adding a standardized discovery mechanism for HTTP-based MCP servers using a .well-known/mcp.json endpoint. Moved from: #1649 Summary This enables clients to automatically discove...
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Jan 29, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-issue-3868246886
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https://github.com/ognis1205
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Feb 2, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-pullrequest-3888082577
docs: clarify reverse DNS namespacing rules for server names and extension metadata modelcontextprotocol/registry#926 https://github.com/modelcontextprotocol/registry/pull/926
https://github.com/ognis1205
ognis1205https://github.com/ognis1205
Feb 2, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#issuecomment-3837832422
modelcontextprotocol/registry#926https://github.com/modelcontextprotocol/registry/pull/926
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https://github.com/qui-sam
qui-samhttps://github.com/qui-sam
Feb 17, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#issuecomment-3915536066
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Clarifications on mcp-server-card dynamic flag #2265 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2265
Clarifications on mcp-server-card dynamic flag #2269 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2269
https://github.com/HenriChabert
HenriChaberthttps://github.com/HenriChabert
Feb 19, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#issuecomment-3925687121
RFC 5646https://datatracker.ietf.org/doc/html/rfc5646
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June 8, 2026 00:51https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#commits-pushed-28c7ab5
https://github.com/claude
SEP-2127: don't presume .well-known in generic delegation referenceshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/28c7ab5d4eece64d915a6f474e1c92ae68903442
28c7ab5https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/28c7ab5d4eece64d915a6f474e1c92ae68903442
https://github.com/claude
SEP-2127: don't state primitive exclusion as fact in the spec pointerhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/8940b023f42f0ed2c30931ff6016a36067f4fb64
8940b02https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/8940b023f42f0ed2c30931ff6016a36067f4fb64
https://github.com/claude
SEP-2127: reconcile charter with open extension-repo issueshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/7749ed0fe26991b5c31f9a287b9a7bfe8afcae97
7749ed0https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/7749ed0fe26991b5c31f9a287b9a7bfe8afcae97
#16https://github.com/modelcontextprotocol/modelcontextprotocol/pull/16
#12https://github.com/modelcontextprotocol/modelcontextprotocol/pull/12
#11https://github.com/modelcontextprotocol/modelcontextprotocol/pull/11
#9https://github.com/modelcontextprotocol/modelcontextprotocol/issues/9
#13https://github.com/modelcontextprotocol/modelcontextprotocol/pull/13
#17https://github.com/modelcontextprotocol/modelcontextprotocol/pull/17
#10https://github.com/modelcontextprotocol/modelcontextprotocol/issues/10
https://github.com/claude
SEP-2127: drop temporal Open Items / status notes from charterhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/229e5cd9525918f4acbe9dbc0c50b759e77ccc34
229e5cdhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/229e5cd9525918f4acbe9dbc0c50b759e77ccc34
https://github.com/claude
SEP-2127: 'MCP / AI Catalog' in Discovery bullet (review suggestion)https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/a02dba04e54c2260acb3876005eea2c73d65bd15
a02dba0https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/a02dba04e54c2260acb3876005eea2c73d65bd15
https://github.com/tadasant
tadasanthttps://github.com/tadasant
Jun 8, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-issue-4609987221
Add a normative requirement that a Server Card MUST NOT contradict the server's actual runtime behavior modelcontextprotocol/experimental-ext-server-card#23 https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/23
https://github.com/tadasant
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Jun 8, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#issuecomment-4646125731
@dsp-anthttps://github.com/dsp-ant
@a-akimovhttps://github.com/a-akimov
are refactoring this SEP to be on the Extensions track instead of the Standards trackhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893
this issuehttps://github.com/modelcontextprotocol/experimental-ext-server-card/issues/23
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Jun 8, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#issuecomment-4652162557
@a-akimovhttps://github.com/a-akimov
are refactoring this SEP to be on the Extensions track instead of the Standards trackhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893
this issuehttps://github.com/modelcontextprotocol/experimental-ext-server-card/issues/23
@tadasanthttps://github.com/tadasant
Please reload this pagehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127
https://github.com/tadasant
Remove temporary MCP catalog reference from this SEPhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/e196ecb76a0b1a9c37ba8486826972570f2119fd
e196ecbhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/e196ecb76a0b1a9c37ba8486826972570f2119fd
https://github.com/Wolfe-Jam
Wolfe-Jamhttps://github.com/Wolfe-Jam
Jun 8, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#issuecomment-4654540645
#22https://github.com/modelcontextprotocol/experimental-ext-server-card/pull/22
#23https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/23
https://github.com/Wolfe-Jam/faf-server-card-refhttps://github.com/Wolfe-Jam/faf-server-card-ref
@dipankarhttps://github.com/dipankar
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Jun 9, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#issuecomment-4654720175
#22https://github.com/modelcontextprotocol/modelcontextprotocol/pull/22
https://gateway.pipeworx.io/.well-known/mcp/catalog.jsonhttps://gateway.pipeworx.io/.well-known/mcp/catalog.json
Change protocol version to a string, rev to 2024-10-07 #22https://github.com/modelcontextprotocol/modelcontextprotocol/pull/22
Fix title of specification page #23https://github.com/modelcontextprotocol/modelcontextprotocol/pull/23
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https://github.com/egil
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Jun 9, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-issue-4620761865
Make bUnit.dev agent ready bUnit-dev/bUnit#1850 https://github.com/bUnit-dev/bUnit/issues/1850
https://github.com/apps/copilot-swe-agent
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Jun 9, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-pullrequest-4620786850
Make bunit.dev agent ready (robots.txt + sitemap via docfx) bUnit-dev/bUnit#1851 https://github.com/bUnit-dev/bUnit/pull/1851
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Jun 9, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-issue-4623027256
Document the _meta extension surface (rider pattern) in the wire-format docs modelcontextprotocol/experimental-ext-server-card#27 https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/27
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Jun 13, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-pullrequest-4609153371
SEP-2127: refactor to Extensions Track charter (delegate spec to experimental-ext-server-card) #2893 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893
https://github.com/vyshnavigadamsetti
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Jun 17, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-issue-4681440948
Add optional tool metadata to Server Card for offline discovery modelcontextprotocol/experimental-ext-server-card#30 https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/30
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Jun 22, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#issuecomment-4767536312
@dsp-anthttps://github.com/dsp-ant
Please reload this pagehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127
Add experimental Server Cards support (SEP-2127) modelcontextprotocol/python-sdk#2951 https://github.com/modelcontextprotocol/python-sdk/pull/2951
Add MCP Server Card (SEP-2127) types + handler github/github-mcp-server#2768 https://github.com/github/github-mcp-server/pull/2768
https://github.com/BrunoCampana
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Jun 25, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-pullrequest-4748075512
QVAC-18437 doc: MCP server - add MCP server card tetherto/qvac#2891 https://github.com/tetherto/qvac/pull/2891
https://github.com/dsp-ant
Merge pull requesthttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/e5d31876502291c6b6fa77ee5a0da7b1b80d290b
#2893https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893
from modelcontextprotocol/sep-2127-extension…https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127/commits/e5d31876502291c6b6fa77ee5a0da7b1b80d290b
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https://github.com/apps/mintlify
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Jun 26, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#issuecomment-4811310587
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June 26, 2026 16:12https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#event-27254195954
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Jun 26, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#issuecomment-4811461064
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June 26, 2026 16:32https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#event-27254927602
View deploymenthttps://mcp-sep-mcp-server-cards.mintlify.app
https://github.com/tadasant
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Jun 26, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-pullrequest-4755251093
docs: refactor MCP mapping appendix to Server Cards + align with MCP spec Agent-Card/ai-catalog#53 https://github.com/Agent-Card/ai-catalog/pull/53
https://github.com/apps/github-actions
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Jun 29, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-issue-4767370155
[MCP: SEP Tracker] Week of 2026-06-29 jeffhandley/dotnet-vitals-servicing-release-manager#27 https://github.com/jeffhandley/dotnet-vitals-servicing-release-manager/issues/27
https://github.com/kaankacar
kaankacarhttps://github.com/kaankacar
Jul 5, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-issue-4813475251
Agent endpoint discovery (MCP Server Card + DNS-AID) stellar/stellar-docs#2555 https://github.com/stellar/stellar-docs/issues/2555
https://github.com/fmind
fmindhttps://github.com/fmind
Jul 12, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#ref-issue-4866166166
Track MCP Server Cards for the federation profile fmind-ai/fgentic#168 https://github.com/fmind-ai/fgentic/issues/168
https://github.com/apps/sep-automation-bot
sep-automation-bothttps://github.com/apps/sep-automation-bot
Jul 13, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127#issuecomment-4956809559
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