Stephen Halter
324ccd83c3
Relax legacy request metadata validation ( #1852 )
...
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Tarek Mahmoud Sayed <10833894+tarekgh@users.noreply.github.com>
2026-09-13 16:30:42 -07:00
Pranav Senthilnathan
df11d7da3b
Fix HTTP fallback error handling ( #1791 )
2026-09-03 16:57:31 -07:00
Recoordinate
bba45c44bf
Fix McpHeaderEncoder.DecodeValue throwing on the degenerate base64 wrapper ( #1805 )
2026-08-12 23:27:48 -07:00
Richard Boisvert
79e13b3e2c
Fall back to initialize when server/discover fails at the HTTP layer ( #1766 )
2026-07-31 12:46:07 -07:00
Paul Carleton
26f60ab7f4
Align the 2026-07-28 wire with spec PR #3002 and SEP-2575 HTTP statuses ( #1752 )
...
Co-authored-by: Stephen Halter <halter73@gmail.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: tarekgh <tarek.mahmoud.sayed@gmail.com>
2026-07-27 16:08:03 -07:00
Pranav Senthilnathan
83523b0a42
Add initial task extension conformance coverage ( #1734 )
...
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 7c99928c-a943-49f4-9a63-8b04a0e4d18b
2026-07-24 17:16:20 -07:00
Jeff Handley
2ca96f548b
Extract Tasks into the ModelContextProtocol.Extensions.Tasks extension package ( #1693 )
...
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>
2026-07-14 18:53:58 -04:00
Pranav Senthilnathan
374e76eecd
Fix missing resultType on complete result responses ( #1684 )
...
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>
2026-07-12 18:24:21 -07:00
Stephen Halter
fd38f51e27
Tighten draft protocol negotiation boundaries ( #1692 )
...
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>
2026-07-12 14:30:49 -07:00
Pranav Senthilnathan
a8d374b280
Fix request-scoped draft client capabilities ( #1685 )
...
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>
2026-07-12 10:56:10 -07:00
Stephen Halter
d6b1615988
Follow-ups to #1610 : de-draft 2026-07-28 terminology, renumber error codes, ProtocolVersion floor ( #1671 )
2026-06-25 14:07:52 -07:00
Stephen Halter
6c323e783b
Default draft protocol support: sessionless + handshake-less (SEP-2575 + SEP-2567) ( #1610 )
2026-06-23 21:24:22 -07:00
Pranav Senthilnathan
dbb7a20176
Implement SEP-2663 Tasks Extension ( #1579 )
...
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-06-11 13:10:45 -07:00
Aditya Singh
af6fcff595
Add McpClientOptions.InitializeMeta to set _meta on the initialize request ( #1599 )
2026-06-05 16:52:31 -07:00
Tarek Mahmoud Sayed
ed19286a08
Align x-mcp-header implementation with SEP-2243 spec clarifications ( #1619 )
...
Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>
2026-06-05 15:45:08 -07:00
Stephen Halter
f6dbe4372f
Multi Round-Trip Requests (MRTR) ( #1458 )
2026-06-03 16:19:31 -07:00
Tarek Mahmoud Sayed
157f855e51
Add RegisterTools API to McpClient for pre-populating tool cache ( #1590 )
...
Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>
2026-05-26 13:31:31 -07:00
Mike Kistler
b8c4d951ec
Implementation for SEP-2243 Http Standardization ( #1553 )
...
Co-authored-by: Tarek Mahmoud Sayed <tarekms@microsoft.com>
Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>
Co-authored-by: Tarek Mahmoud Sayed <10833894+tarekgh@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-05-14 15:39:37 -07:00
Copilot
7662ce6b70
Make ClientTransportClosedException public and unify transport exception handling ( #1467 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: halter73 <54385+halter73@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
2026-03-29 20:21:03 -04:00
Copilot
49bf17077d
Fix WithMeta + WithProgress causing tool invocation failure ( #1464 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
2026-03-27 15:41:58 -04:00
Copilot
7dcdbafe9d
Add 3-arg RequestContext constructor and obsolete 2-arg to eliminate null-forgiving operator usage ( #1462 )
2026-03-27 12:33:23 -07:00
Stephen Toub
b965a7eca6
Add client completion notification and details ( #1368 )
...
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-02 09:17:22 -05:00
Copilot
919e8383f0
Register ping handler in McpSessionHandler to support server-initiated pings ( #1391 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
2026-02-26 18:53:20 -05:00
Copilot
8c46411f82
Fix McpClientPrompt/Resource types to use RequestOptions like McpClientTool does ( #1370 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
2026-02-23 23:40:54 -05:00
Copilot
0a0a575a3d
Normalize CallToolResult.StructuredContent to JsonElement? ( #1357 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
2026-02-23 18:04:09 -05:00
Copilot
571e4dc127
Make LoggingMessageNotificationParams.Data required per MCP spec ( #1353 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
2026-02-23 11:37:35 -05:00
Copilot
80b1ad21d7
Use ReadOnlyMemory<byte> for binary data to eliminate UTF-16 transcoding ( #1070 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: ericstj <8918108+ericstj@users.noreply.github.com>
Co-authored-by: Eric StJohn <ericstj@microsoft.com>
2026-02-19 14:08:05 -08:00
Copilot
8e57ac6b0e
Centralize test timeout constants to fix sporadic CI failures ( #1210 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: ericstj <8918108+ericstj@users.noreply.github.com>
Co-authored-by: Eric StJohn <ericstj@microsoft.com>
2026-01-29 22:06:17 -05:00
Eirik Tsarpalis
10e4f5b20f
Implement MCP task support (SEP-1686) ( #1170 )
...
Co-authored-by: Stephen Halter <halter73@gmail.com>
2026-01-27 19:21:02 -08:00
Copilot
46d30444a8
Fix ToJsonObject serialization failure with anonymous types and add support for custom JsonSerializerOptions ( #1113 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: eiriktsarpalis <2813363+eiriktsarpalis@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
2026-01-20 11:21:11 +02:00
Copilot
774411b22c
Add 2025-11-25 as supported version ( #1130 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
2026-01-15 09:59:42 -05:00
Mackinnon Buck
b8311756b4
Streamable HTTP resumability + redelivery + SSE polling via server-side disconnect ( #1077 )
...
Co-authored-by: Stephen Halter <halter73@gmail.com>
2026-01-14 22:54:25 -08:00
Copilot
bafbb0a8ba
Fix CreateSamplingHandler to use ChatRole.Tool for tool result messages ( #1128 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
Co-authored-by: Mackinnon Buck <mackinnon.buck@gmail.com>
2026-01-06 16:58:41 -05:00
Copilot
862492d32f
Add SubscribeToResourceAsync overload with handler delegate ( #1069 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
2025-12-05 18:15:24 -05:00
Peder Holdgaard Pedersen
d99f882884
Add McpClientTool.WithMeta ( #1027 )
...
Co-authored-by: Stephen Toub <stoub@microsoft.com>
2025-12-05 15:41:44 -05:00
Stephen Toub
4a84412331
Add McpClient/Session methods using .Protocol types ( #1063 )
2025-12-05 13:45:12 -05:00
Mike Kistler
c447973972
Add request options bag to high level requests and include Meta ( #970 )
...
Co-authored-by: Stephen Toub <stoub@microsoft.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
2025-12-04 17:32:12 -05:00
Copilot
627de76ca6
Remove McpClient.Enumerate*Async methods ( #1060 )
2025-12-04 11:05:40 -08:00
Copilot
136755f2be
Remove obsolete APIs from codebase and standardize MCP diagnostic IDs ( #985 )
...
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
Co-authored-by: eiriktsarpalis <2813363+eiriktsarpalis@users.noreply.github.com>
Co-authored-by: Mackinnon Buck <mackinnon.buck@gmail.com>
Co-authored-by: jeffhandley <1031940+jeffhandley@users.noreply.github.com>
Co-authored-by: Jeff Handley <jeffhandley@users.noreply.github.com>
2025-12-02 10:28:46 -08:00
Stephen Toub
15139cc569
Add tools support to sampling ( #976 )
2025-11-20 09:52:23 -05:00
Mackinnon Buck
d540dc1fb1
Make RequestId non-required ( #984 )
2025-11-18 16:03:31 -08:00
Copilot
00bb5b2678
Add Description property to Implementation type per MCP spec ( #966 )
...
* Initial plan
* Add Description property to Implementation type
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
* Add test to validate client Description from server perspective
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
2025-11-17 10:42:40 -05:00
Stephen Toub
98a0261585
Tweak how McpClientTool.InvokeAsync exposes some content ( #941 )
...
Rather than always serializing to a JsonElement, which IChatClients that consume the tool won't be able to reason about, convert the content into AIContents that they can reason about.
2025-11-06 21:47:19 -05:00
Copilot
b90f17bccb
Add public constructors to McpClient types for reusing cached definitions ( #938 )
...
* Initial plan
* Add public constructor to McpClientTool for reusing tool definitions
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
* Fix McpClientTool constructor per review feedback
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
* Add public constructors for McpClientPrompt, McpClientResource, and McpClientResourceTemplate
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
2025-11-06 13:59:17 -05:00
Mackinnon Buck
121929da36
Audit protocol types ( #892 )
2025-11-04 15:41:10 -08:00
Copilot
f28639119b
Implement SEP-973: Icons and metadata support for Implementations, Resources, Tools, and Prompts ( #802 )
...
* Initial plan
* Initial plan for SEP-973 implementation
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
* Implement SEP-973: Add Icon class and icon support to Implementation, Resource, Tool, and Prompt
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
* Complete SEP-973 implementation with documentation and fix property consistency
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
* Address code review feedback: improve tests, remove docs, split test files
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
* Fix tests to use S.T.J. source generator
* Styling fixes
* Simplify Icons property documentation as suggested in code review
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
* Rename Icon.Src property to Icon.Source for more .NET-y naming
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
* Add icon support to McpServerTool infrastructure and attributes
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
* Cleanup
* Refactor icon tests to use Delegate overload instead of MethodInfo pattern
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
* Change Icon.Sizes property from string to IList<string> per spec update
Co-authored-by: jozkee <16040868+jozkee@users.noreply.github.com>
* Add icon support to Prompts and Resources (CreateOptions and Attributes)
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
* Add client-server integration tests for Icons and WebsiteUrl
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
* Fix nullability warnings
* Revert "Add client-server integration tests for Icons and WebsiteUrl"
This reverts commit f37de15569e54e86a0709121c9bdf80c5045511c.
* More nullability fixes
* Add more tests
* Address code review feedback: add Theme property, fix docs, improve test patterns
Co-authored-by: jozkee <16040868+jozkee@users.noreply.github.com>
* Update Icon tests to exercise Theme property
Co-authored-by: jozkee <16040868+jozkee@users.noreply.github.com>
* Add Theme property assertions to client-server integration tests
Co-authored-by: jozkee <16040868+jozkee@users.noreply.github.com>
* Fix nullability
---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
Co-authored-by: Mackinnon Buck <mackinnon.buck@gmail.com>
Co-authored-by: jozkee <16040868+jozkee@users.noreply.github.com>
Co-authored-by: David Cantú <dacantu@microsoft.com>
2025-10-08 12:23:01 -07:00
David Cantú
5f992994c3
Decouple Handlers and Collections from protocol types ( #765 )
...
* Decouple Handlers and Collections (e.g. ToolsHandler and ToolsCollection) from Capabilities by promoting them to the options types.
Also, group all handlers in container classes, for server, I decided to move McpServerHandlers down to Mcp.Core and move the NotificationHandlers there too.
Also, Fix ListResourceTemplatesHandler issue.
* Add remarks for empty protocol capability types
* Keep JsonIgnore properties and mark them as Obsolete
* Continue supporting Obsolete members
* Update Obsolete messages to indicate the member will be removed
* Add EditorBrowsable Never to the remaining obsolete members
2025-09-24 09:42:03 -05:00
Eirik Tsarpalis
7cfe0ef621
Add McpSessions.NegotiatedProtocolVersion property. ( #794 )
2025-09-19 13:11:01 +03:00
Mackinnon Buck
38b4a26998
Restructure IMcpEndpoint, IMcpClient, and IMcpServer ( #723 )
...
* Remove `McpEndpoint` & `IMcpClient`
* Revise naming, add abstract classes
* Fix missing renames
* Move extension methods to instance methods
* Add back old API, but obsoleted
* Add back obsoleted factory classes
* Move deprecation attributes
* `SseClientTransport` -> `HttpClientTransport`
* Update src/ModelContextProtocol.Core/Server/AugmentedServiceProvider.cs
Co-authored-by: Stephen Halter <halter73@gmail.com>
* PR feedback
* PR feedback
* Add back dispose lock
* Fix docs projects
* PR feedback
* Undo `docs/*.md` changes
---------
Co-authored-by: Stephen Halter <halter73@gmail.com>
2025-09-16 10:22:10 -07:00
Eirik Tsarpalis
55bda787ae
Styling: remove a few redundant parens from object initializer expressions. ( #548 )
...
* Styling: remove a few redundant parens from object initializer expressions.
* Fix build error.
2025-06-26 16:55:54 +03:00
