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Title: SEP-2127: refactor to Extensions Track charter (delegate spec to experimental-ext-server-card) by tadasant · Pull Request #2893 · modelcontextprotocol/modelcontextprotocol · GitHub

Open Graph Title: SEP-2127: refactor to Extensions Track charter (delegate spec to experimental-ext-server-card) by tadasant · Pull Request #2893 · modelcontextprotocol/modelcontextprotocol

X Title: SEP-2127: refactor to Extensions Track charter (delegate spec to experimental-ext-server-card) by tadasant · Pull Request #2893 · modelcontextprotocol/modelcontextprotocol

Description: Specification and documentation for the Model Context Protocol - SEP-2127: refactor to Extensions Track charter (delegate spec to experimental-ext-server-card) by tadasant · Pull Request #2893 · modelcontextprotocol/modelcontextprotocol

Open Graph Description: Builds on #2127 Refactors SEP-2127 (MCP Server Cards) from Standards Track to Extensions Track, slimming the body to a charter (SEP-1865 shape) that delegates the detailed wire format to modelconte...

X Description: Builds on #2127 Refactors SEP-2127 (MCP Server Cards) from Standards Track to Extensions Track, slimming the body to a charter (SEP-1865 shape) that delegates the detailed wire format to modelconte...

Opengraph URL: https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893

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SEP-2127: refactor to Extensions Track charter (delegate spec to experimental-ext-server-card)https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#top
dsp-anthttps://github.com/dsp-ant
sep/mcp-server-cardshttps://github.com/modelcontextprotocol/modelcontextprotocol/tree/sep/mcp-server-cards
sep-2127-extensions-track-refactorhttps://github.com/modelcontextprotocol/modelcontextprotocol/tree/sep-2127-extensions-track-refactor
https://github.com/tadasant
tadasanthttps://github.com/tadasant
Jun 8, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#issue-4609153371
Please reload this pagehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893
#2127https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127
modelcontextprotocol/experimental-ext-server-cardhttps://github.com/modelcontextprotocol/experimental-ext-server-card
experimental-ext-server-card#15https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/15
@dsp-anthttps://github.com/dsp-ant
@SamMorrowDrumshttps://github.com/SamMorrowDrums
@tadasanthttps://github.com/tadasant
python-sdk#2696https://github.com/modelcontextprotocol/python-sdk/pull/2696
@dsp-anthttps://github.com/dsp-ant
SEP-1865 as publishedhttps://modelcontextprotocol.io/seps/1865-mcp-apps-interactive-user-interfaces-for-mcp
aa59517https://github.com/modelcontextprotocol/modelcontextprotocol/blob/aa59517442d323a33ed915fc408f1584c4a23dfa/seps/2127-mcp-server-cards.md
ffe58b0https://github.com/modelcontextprotocol/experimental-ext-server-card/tree/ffe58b0fe31394f209190395d7fc4f8e9118e70b
#12https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/12
#10https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/10
L80–158https://github.com/modelcontextprotocol/modelcontextprotocol/blob/aa59517442d323a33ed915fc408f1584c4a23dfa/seps/2127-mcp-server-cards.md#L80-L158
L159–175https://github.com/modelcontextprotocol/modelcontextprotocol/blob/aa59517442d323a33ed915fc408f1584c4a23dfa/seps/2127-mcp-server-cards.md#L159-L175
schema.ts → interface ServerCardhttps://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/schema.ts#L27-L122
schema.jsonhttps://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/schema.json
examples/ServerCard/valid/https://github.com/modelcontextprotocol/experimental-ext-server-card/tree/ffe58b0fe31394f209190395d7fc4f8e9118e70b/examples/ServerCard/valid
L176–248https://github.com/modelcontextprotocol/modelcontextprotocol/blob/aa59517442d323a33ed915fc408f1584c4a23dfa/seps/2127-mcp-server-cards.md#L176-L248
L249–255https://github.com/modelcontextprotocol/modelcontextprotocol/blob/aa59517442d323a33ed915fc408f1584c4a23dfa/seps/2127-mcp-server-cards.md#L249-L255
schema.ts → interface Server extends ServerCardhttps://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/schema.ts#L135-L140
L228+https://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/schema.ts#L228-L262
examples/Server/valid/with-package.jsonhttps://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/examples/Server/valid/with-package.json
ext-repo #12https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/12
L257–305https://github.com/modelcontextprotocol/modelcontextprotocol/blob/aa59517442d323a33ed915fc408f1584c4a23dfa/seps/2127-mcp-server-cards.md#L257-L305
docs/discovery.mdhttps://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/docs/discovery.md
L177–185https://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/docs/discovery.md#L177-L185
L189–195https://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/docs/discovery.md#L189-L195
L197–200https://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/docs/discovery.md#L197-L200
experimental-ext-server-card#12https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/12
#12https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/12
L389–399https://github.com/modelcontextprotocol/modelcontextprotocol/blob/aa59517442d323a33ed915fc408f1584c4a23dfa/seps/2127-mcp-server-cards.md#L389-L399
#12https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/12
#9https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/9
#12https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/12
#10https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/10
L354–384https://github.com/modelcontextprotocol/modelcontextprotocol/blob/aa59517442d323a33ed915fc408f1584c4a23dfa/seps/2127-mcp-server-cards.md#L354-L384
docs/discovery.md → Security Considerationshttps://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/docs/discovery.md#L166-L200
L168–175https://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/docs/discovery.md#L168-L175
L177–187https://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/docs/discovery.md#L177-L187
L197–200https://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/docs/discovery.md#L197-L200
schema.ts L16–19https://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/schema.ts#L16-L19
L143https://github.com/modelcontextprotocol/experimental-ext-server-card/blob/ffe58b0fe31394f209190395d7fc4f8e9118e70b/docs/discovery.md#L139-L144
#10https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/10
L377–379https://github.com/modelcontextprotocol/modelcontextprotocol/blob/aa59517442d323a33ed915fc408f1584c4a23dfa/seps/2127-mcp-server-cards.md#L377-L379
experimental-ext-server-card#21https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/21
#10https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/10
#10https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/10
#10https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/10
L389–399https://github.com/modelcontextprotocol/modelcontextprotocol/blob/aa59517442d323a33ed915fc408f1584c4a23dfa/seps/2127-mcp-server-cards.md#L389-L399
#12https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/12
#9https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/9
Please reload this pagehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893
June 8, 2026 00:04https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#commits-pushed-4590aa4
https://github.com/claude
SEP-2127: refactor to Extensions Track charterhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/4590aa406e47f8d39f4ea56199f408c3a044e3d0
4590aa4https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/4590aa406e47f8d39f4ea56199f408c3a044e3d0
https://github.com/claude
SEP-2127: update authors — swap Nick Cooper for Sam Morrowhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/e99ebf6bc8df4b799bf3a5bb88bf41dca3d955c2
e99ebf6https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/e99ebf6bc8df4b799bf3a5bb88bf41dca3d955c2
@nickcoaihttps://github.com/nickcoai
@SamMorrowDrumshttps://github.com/SamMorrowDrums
https://github.com/tadasant
tadasanthttps://github.com/tadasant
Jun 8, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#issuecomment-4644643043
e99ebf6https://github.com/modelcontextprotocol/modelcontextprotocol/commit/e99ebf6b
@nickcoaihttps://github.com/nickcoai
@SamMorrowDrumshttps://github.com/SamMorrowDrums
@dsp-anthttps://github.com/dsp-ant
@SamMorrowDrumshttps://github.com/SamMorrowDrums
@tadasanthttps://github.com/tadasant
Please reload this pagehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893
June 8, 2026 00:51https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#commits-pushed-28c7ab5
https://github.com/claude
SEP-2127: don't presume .well-known in generic delegation referenceshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/28c7ab5d4eece64d915a6f474e1c92ae68903442
28c7ab5https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/28c7ab5d4eece64d915a6f474e1c92ae68903442
https://github.com/claude
SEP-2127: don't state primitive exclusion as fact in the spec pointerhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/8940b023f42f0ed2c30931ff6016a36067f4fb64
8940b02https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/8940b023f42f0ed2c30931ff6016a36067f4fb64
https://github.com/claude
SEP-2127: reconcile charter with open extension-repo issueshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/7749ed0fe26991b5c31f9a287b9a7bfe8afcae97
7749ed0https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/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/2893/commits/229e5cd9525918f4acbe9dbc0c50b759e77ccc34
229e5cdhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/229e5cd9525918f4acbe9dbc0c50b759e77ccc34
https://github.com/tadasant
tadasanthttps://github.com/tadasant
Jun 8, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#pullrequestreview-4446162052
View reviewed changes https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/files/229e5cd9525918f4acbe9dbc0c50b759e77ccc34
docs/seps/2127-mcp-server-cards.mdxhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/files/229e5cd9525918f4acbe9dbc0c50b759e77ccc34#diff-ebe9a3d91992cf93a01bced04c1e08c206e66ae9dd446642a849798e0c9b0cac
Please reload this pagehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893
https://github.com/tadasant
tadasanthttps://github.com/tadasant
Jun 8, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#ref-issue-4609389985
Add denial-of-service / rate-limiting guidance to the Security Considerations in docs/discovery.md modelcontextprotocol/experimental-ext-server-card#21 https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/21
https://github.com/claude
SEP-2127: 'MCP / AI Catalog' in Discovery bullet (review suggestion)https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/a02dba04e54c2260acb3876005eea2c73d65bd15
a02dba0https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/a02dba04e54c2260acb3876005eea2c73d65bd15
https://github.com/tadasant
tadasanthttps://github.com/tadasant
June 8, 2026 02:13https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#event-26451034430
https://github.com/tadasant
tadasanthttps://github.com/tadasant
code ownershttps://github.com/modelcontextprotocol/modelcontextprotocol/blob/aa59517442d323a33ed915fc408f1584c4a23dfa/.github/CODEOWNERS#L4
June 8, 2026 02:13https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#event-26451034597
https://github.com/tadasant
tadasanthttps://github.com/tadasant
SamMorrowDrumshttps://github.com/SamMorrowDrums
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June 8, 2026 02:14https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#event-26451037474
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
SEP-2127: MCP Server Cards - HTTP Server Discovery via .well-known #2127 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2127
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Remove temporary MCP catalog reference from this SEPhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893/commits/e196ecb76a0b1a9c37ba8486826972570f2119fd
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Jun 9, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#ref-issue-4555902371
Refactor SEP-2127 (MCP Server Cards) from Standards Track to Extensions Track modelcontextprotocol/experimental-ext-server-card#15 https://github.com/modelcontextprotocol/experimental-ext-server-card/issues/15
Trust & privacy extensions: scaffolding + the trust-annotations base modelcontextprotocol/experimental-ext-tool-annotations#2 https://github.com/modelcontextprotocol/experimental-ext-tool-annotations/pull/2
SEP-1913: Trust and Sensitivity Annotations #1913 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1913
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Jun 13, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#event-26713156772
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Jun 26, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#event-27253484130
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June 26, 2026 15:52https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2893#event-27253485482
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research(mcp): MCP Server Cards — SEP-2127 draft, WG charter active, June 2026 target bug-ops/zeph#3701 https://github.com/bug-ops/zeph/issues/3701
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