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| og:image:alt | Closes #2903.
SEP-2106 permits the full JSON Schema 2020-12 vocabulary in tool schemas, including $ref. A $ref resolving to a network URI is an SSRF / fetch-DoS vector. The SEP requires:
Implement... |
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| Conversation | https://github.com/modelcontextprotocol/python-sdk/pull/2924 |
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| Pass json-schema-ref-no-deref conformance scenario (SEP-2106) | https://github.com/modelcontextprotocol/python-sdk/pull/2924#top |
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| Jun 20, 2026 | https://github.com/modelcontextprotocol/python-sdk/pull/2924#issue-4707263852 |
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| #2903 | https://github.com/modelcontextprotocol/python-sdk/issues/2903 |
| Protocol types for 2026-07-28: superset monolith, committed per-version packages, and wire-method maps #2849 | https://github.com/modelcontextprotocol/python-sdk/pull/2849 |
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| June 20, 2026 17:24 | https://github.com/modelcontextprotocol/python-sdk/pull/2924#commits-pushed-33774ff |
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| Reject external JSON Schema $ref in tool schemas (SEP-2106) | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/33774ff1553ba75a71813428e30304a835378e78 |
| 33774ff | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/33774ff1553ba75a71813428e30304a835378e78 |
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| Drop conformance burn-down and migration docs from this PR | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/69ea4fb7656aa0730bf1689d64acaed2a48e4c2f |
| 69ea4fb | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/69ea4fb7656aa0730bf1689d64acaed2a48e4c2f |
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| https://github.com/Kludex |
| Reject external $ref via the tool schema generator | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/b0786d1628a794accc13fe9f7ce566aece70de52 |
| b0786d1 | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/b0786d1628a794accc13fe9f7ce566aece70de52 |
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Jun 20, 2026
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View reviewed changes
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| src/mcp/shared/json_schema_ref.py | https://github.com/modelcontextprotocol/python-sdk/pull/2924/files/33774ff1553ba75a71813428e30304a835378e78#diff-d76744ed96293a0674f16de82ae82664adeaf25408b03d7709ee23d7b1e62d99 |
| Please reload this page | https://github.com/modelcontextprotocol/python-sdk/pull/2924 |
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| June 20, 2026 17:39 | https://github.com/modelcontextprotocol/python-sdk/pull/2924#commits-pushed-9b8d0aa |
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| https://github.com/Kludex |
| Inline the tool schema generator into func_metadata | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/9b8d0aa73dc0882fa900f1ba0209aec2d4356975 |
| 9b8d0aa | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/9b8d0aa73dc0882fa900f1ba0209aec2d4356975 |
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| https://github.com/Kludex |
| Make ExternalSchemaRefError a hard error, not a ValueError | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/f7366a6a4244a4b6486594bb7592ec5da690546d |
| f7366a6 | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/f7366a6a4244a4b6486594bb7592ec5da690546d |
| https://github.com/apps/claude |
| claude | https://github.com/apps/claude |
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Jun 20, 2026
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View reviewed changes
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| src/mcp/server/mcpserver/tools/base.py | https://github.com/modelcontextprotocol/python-sdk/pull/2924/files/b0786d1628a794accc13fe9f7ce566aece70de52#diff-b53a543261a9bc27476087bcb5fcf6e0d7e9d1b5b3df09e312f22b22ccffe761 |
| Please reload this page | https://github.com/modelcontextprotocol/python-sdk/pull/2924 |
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| Burn down json-schema-ref-no-deref conformance scenario | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/4d8f900f9c264611808575e7d03e81e96246e5b0 |
| 4d8f900 | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/4d8f900f9c264611808575e7d03e81e96246e5b0 |
| https://github.com/apps/claude |
| claude | https://github.com/apps/claude |
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Jun 20, 2026
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View reviewed changes
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| src/mcp/server/mcpserver/utilities/func_metadata.py | https://github.com/modelcontextprotocol/python-sdk/pull/2924/files/f7366a6a4244a4b6486594bb7592ec5da690546d#diff-5584d2273ac6a270822fe54fb95a27e03d6895afd1216e8bd71d1850e8f09676 |
| Please reload this page | https://github.com/modelcontextprotocol/python-sdk/pull/2924 |
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| https://github.com/Kludex |
| Align SEP-2106 $ref handling to the spec | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/a53b89242492f59276cf1e8cf81cc3b9b6864489 |
| a53b892 | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/a53b89242492f59276cf1e8cf81cc3b9b6864489 |
| https://github.com/Kludex |
| Kludex | https://github.com/Kludex |
| Jun 20, 2026 | https://github.com/modelcontextprotocol/python-sdk/pull/2924#event-26993231663 |
| Kludex | https://github.com/Kludex |
| June 20, 2026 18:06 | https://github.com/modelcontextprotocol/python-sdk/pull/2924#commits-pushed-7a2e7ab |
|
| https://github.com/Kludex |
| Reuse the initialize handler for json-schema-ref-no-deref | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/7a2e7abe1ee3a4e3064c43b7393226032032710a |
| 7a2e7ab | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/7a2e7abe1ee3a4e3064c43b7393226032032710a |
|
| https://github.com/Kludex |
| Give json-schema-ref-no-deref its own handler | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/a06d8e1d7cf2fc30b9a99d1f4fddba47b7921e3e |
| a06d8e1 | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/a06d8e1d7cf2fc30b9a99d1f4fddba47b7921e3e |
| @register | https://github.com/register |
| https://github.com/apps/claude |
| claude | https://github.com/apps/claude |
|
Jun 20, 2026
| https://github.com/modelcontextprotocol/python-sdk/pull/2924#pullrequestreview-4538223016 |
|
View reviewed changes
| https://github.com/modelcontextprotocol/python-sdk/pull/2924/files/4d8f900f9c264611808575e7d03e81e96246e5b0 |
| claude | https://github.com/apps/claude |
| https://github.com/modelcontextprotocol/python-sdk/pull/2924#pullrequestreview-4538223016 |
| Learn more | https://docs.github.com/articles/managing-disruptive-comments/#hiding-a-comment |
| Please reload this page | https://github.com/modelcontextprotocol/python-sdk/pull/2924 |
| Kludex | https://github.com/Kludex |
| June 20, 2026 18:13 | https://github.com/modelcontextprotocol/python-sdk/pull/2924#commits-pushed-8e255ad |
|
| https://github.com/Kludex |
| Merge remote-tracking branch 'origin/main' into sep-2106-json-schema-ref | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/8e255ada033706d483d5c0a8e94a2367c64b68f2 |
| 8e255ad | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/8e255ada033706d483d5c0a8e94a2367c64b68f2 |
|
| https://github.com/Kludex |
| Guard the no-deref test with a socket tripwire | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/2c47fc4e7deb3bee5037c5ffab260bb6d8960d35 |
| 2c47fc4 | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/2c47fc4e7deb3bee5037c5ffab260bb6d8960d35 |
|
| https://github.com/Kludex |
| Drop the Python no-deref unit test | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/c7522f232492378a9dff0e2b74e60fac55f0189f |
| c7522f2 | https://github.com/modelcontextprotocol/python-sdk/pull/2924/commits/c7522f232492378a9dff0e2b74e60fac55f0189f |
| https://github.com/Kludex |
| Kludex | https://github.com/Kludex |
| Jun 20, 2026 | https://github.com/modelcontextprotocol/python-sdk/pull/2924#issuecomment-4758991051 |
| session.py | https://github.com/modelcontextprotocol/python-sdk/blob/main/src/mcp/client/session.py |
| #2849 | https://github.com/modelcontextprotocol/python-sdk/pull/2849 |
| Please reload this page | https://github.com/modelcontextprotocol/python-sdk/pull/2924 |
| https://github.com/maxisbey |
| maxisbey | https://github.com/maxisbey |
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Jun 20, 2026
| https://github.com/modelcontextprotocol/python-sdk/pull/2924#pullrequestreview-4538251952 |
|
View reviewed changes
| https://github.com/modelcontextprotocol/python-sdk/pull/2924/files/c7522f232492378a9dff0e2b74e60fac55f0189f |
| https://github.com/Kludex |
| Kludex | https://github.com/Kludex |
| 5734acf | https://github.com/modelcontextprotocol/python-sdk/commit/5734acf18e4a010197cf7aa56f057390befa62ac |
| Jun 20, 2026 | https://github.com/modelcontextprotocol/python-sdk/pull/2924#event-26993820055 |
| Please reload this page | https://github.com/modelcontextprotocol/python-sdk/pull/2924 |
| https://github.com/Kludex |
| Kludex | https://github.com/Kludex |
| June 20, 2026 16:24 | https://github.com/modelcontextprotocol/python-sdk/pull/2924#event-26993821712 |
| https://github.com/apps/claude |
| claude | https://github.com/apps/claude |
|
Jun 20, 2026
| https://github.com/modelcontextprotocol/python-sdk/pull/2924#pullrequestreview-4538269250 |
|
View reviewed changes
| https://github.com/modelcontextprotocol/python-sdk/pull/2924/files/c7522f232492378a9dff0e2b74e60fac55f0189f |
| claude | https://github.com/apps/claude |
| https://github.com/modelcontextprotocol/python-sdk/pull/2924#pullrequestreview-4538269250 |
| Learn more | https://docs.github.com/articles/managing-disruptive-comments/#hiding-a-comment |
| c7522f2 | https://github.com/modelcontextprotocol/python-sdk/commit/c7522f232492378a9dff0e2b74e60fac55f0189f |
| Please reload this page | https://github.com/modelcontextprotocol/python-sdk/pull/2924 |
| .github/actions/conformance/client.py | https://github.com/modelcontextprotocol/python-sdk/pull/2924/files/c7522f232492378a9dff0e2b74e60fac55f0189f#diff-823c6bf6584b99e84ad74327720949300eb016f0efd6497c143dbd56307b058f |
| claude | https://github.com/apps/claude |
| Jun 20, 2026 | https://github.com/modelcontextprotocol/python-sdk/pull/2924#discussion_r3446980971 |
| Learn more | https://docs.github.com/articles/managing-disruptive-comments/#hiding-a-comment |
| c7522f2 | https://github.com/modelcontextprotocol/python-sdk/commit/c7522f232492378a9dff0e2b74e60fac55f0189f |
| 2c47fc4 | https://github.com/modelcontextprotocol/python-sdk/commit/2c47fc4e7deb3bee5037c5ffab260bb6d8960d35 |
| c7522f2 | https://github.com/modelcontextprotocol/python-sdk/commit/c7522f232492378a9dff0e2b74e60fac55f0189f |
| 2c47fc4 | https://github.com/modelcontextprotocol/python-sdk/commit/2c47fc4e7deb3bee5037c5ffab260bb6d8960d35 |
| c7522f2 | https://github.com/modelcontextprotocol/python-sdk/commit/c7522f232492378a9dff0e2b74e60fac55f0189f |
| 2c47fc4 | https://github.com/modelcontextprotocol/python-sdk/commit/2c47fc4e7deb3bee5037c5ffab260bb6d8960d35 |
| Please reload this page | https://github.com/modelcontextprotocol/python-sdk/pull/2924 |
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| Jun 26, 2026 | https://github.com/modelcontextprotocol/python-sdk/pull/2924#issuecomment-4807960202 |
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Jun 26, 2026
| https://github.com/modelcontextprotocol/python-sdk/pull/2924#ref-issue-4602774170 |
|
Implement SEP-2106: Tools inputSchema & outputSchema Conform to JSON Schema 2020-12
#2792
| https://github.com/modelcontextprotocol/python-sdk/issues/2792 |
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claude[bot]
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| https://github.com/modelcontextprotocol/python-sdk/pull/2924/files/c7522f232492378a9dff0e2b74e60fac55f0189f |
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maxisbey
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| https://github.com/modelcontextprotocol/python-sdk/pull/2924/files/c7522f232492378a9dff0e2b74e60fac55f0189f |
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SEP-2106 — JSON Schema 2020-12 + structuredContent
| https://github.com/modelcontextprotocol/python-sdk/issues/2903 |
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