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Title: SEP-1761: Add MCP extensions framework by pja-ant · Pull Request #1761 · modelcontextprotocol/modelcontextprotocol · GitHub

Open Graph Title: SEP-1761: Add MCP extensions framework by pja-ant · Pull Request #1761 · modelcontextprotocol/modelcontextprotocol

X Title: SEP-1761: Add MCP extensions framework by pja-ant · Pull Request #1761 · modelcontextprotocol/modelcontextprotocol

Description: Specification and documentation for the Model Context Protocol - SEP-1761: Add MCP extensions framework by pja-ant · Pull Request #1761 · modelcontextprotocol/modelcontextprotocol

Open Graph Description: Specification of #1724 (pending acceptance). Changes: Add extensions field to ClientCapabilities and ServerCapabilities Add extension negotiation section to lifecycle documentation Add extensions ...

X Description: Specification of #1724 (pending acceptance). Changes: Add extensions field to ClientCapabilities and ServerCapabilities Add extension negotiation section to lifecycle documentation Add extensions ...

Opengraph URL: https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761

X: @github

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Domain: github.com

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af69a5dhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/af69a5ddb767f5b0fd90fe62fe434bbc8e6c27c7
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Update docs/extensions/index.mdxhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/3cb37483f4b9433c957befcb837596a54f597b00
3cb3748https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/3cb37483f4b9433c957befcb837596a54f597b00
https://github.com/apps/mintlify
mintlifyhttps://github.com/apps/mintlify
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November 6, 2025 18:18https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761#event-20767711336
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November 6, 2025 18:25https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761#commits-pushed-df7e527
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Improve extensions overviewhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/df7e5272fac33e64d3e1b51c093b31a7b6f96e82
df7e527https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/df7e5272fac33e64d3e1b51c093b31a7b6f96e82
https://github.com/pja-ant
Add vendor prefix to recommended extensionshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/da4dbe9e822435970db6ff2137def75f99d29f8f
da4dbe9https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/da4dbe9e822435970db6ff2137def75f99d29f8f
https://github.com/pja-ant
use 'custom vendor' languagehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/f142d8b91073c1f6aa24c1e69ab6f624c97cd532
f142d8bhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/f142d8b91073c1f6aa24c1e69ab6f624c97cd532
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SHOULD emphasishttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/b4d20b9a64872e4b54fdb7ea02ff626c7041d887
b4d20b9https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/b4d20b9a64872e4b54fdb7ea02ff626c7041d887
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Rename extension configuration to extension capabilitieshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/79718b0711b22f862907892297946c7d92cd9f95
79718b0https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/79718b0711b22f862907892297946c7d92cd9f95
https://github.com/pja-ant
update list orderhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/f705b2c71e32ff839527bc0908d2a54fb7985b92
f705b2chttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/f705b2c71e32ff839527bc0908d2a54fb7985b92
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update negotiation sectionhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/cb218e2bf77f394a678faf654d6cc58a93154bef
cb218e2https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/cb218e2bf77f394a678faf654d6cc58a93154bef
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remove broken linkhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/54f11d9989ab03dca7f662629c89ce596e6054f9
54f11d9https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/54f11d9989ab03dca7f662629c89ce596e6054f9
https://github.com/pja-ant
Refactor table + submission list updatehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/849b9b3c14c21fd25951a0704c8d5626099a8625
849b9b3https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/849b9b3c14c21fd25951a0704c8d5626099a8625
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update list orederhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/5a64cb465096ac2d55de79449594298fcbd28b5f
5a64cb4https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/5a64cb465096ac2d55de79449594298fcbd28b5f
https://github.com/apps/mintlify
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November 6, 2025 21:36https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761#event-20772058453
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simplify architecture sectionhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/aac3d29413555e8b61edecc11b54fb262fc636e0
aac3d29https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/aac3d29413555e8b61edecc11b54fb262fc636e0
https://github.com/apps/mintlify
mintlifyhttps://github.com/apps/mintlify
deployedhttps://mcp-staging-sep-1724-add-extensions-framework.mintlify.app
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November 6, 2025 21:42https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761#event-20772153577
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lifecycle page fixeshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/d6934d4b442b036e1a5e2de71a159f22d92d793b
d6934d4https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761/commits/d6934d4b442b036e1a5e2de71a159f22d92d793b
https://github.com/apps/mintlify
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staging - docshttps://mcp-staging-sep-1724-add-extensions-framework.mintlify.app
November 6, 2025 21:43https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761#event-20772179226
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Jan 14, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761#event-22051684943
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Jan 21, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761#event-22201677055
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Jan 22, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761#issuecomment-3785131891
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Please reload this pagehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761
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Jan 22, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761#event-22219634545
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Jan 28, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1761#event-22358856504
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