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Fix missing resultType on complete result responses - #1684
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Set resultType at server response construction paths instead of relying on a model default. This ensures complete responses consistently carry resultType=complete while preserving task/input-required variants. Also expand server/client tests to assert deserialized ResultType across methods covered by modelcontextprotocol#1676, including server/discover. Fixes modelcontextprotocol#1676 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
This PR updates the C# MCP SDK server’s result construction paths to ensure resultType is present (and deserializes as "complete") for completed responses, aligning server outputs with the July 2026 / 2026-07-28 draft schema requirements highlighted in #1676. It also strengthens test coverage to prevent regressions across multiple server methods and server/discover.
Changes:
- Ensure server response results have
ResultType = "complete"when omitted (including a centralized post-handler fix-up forResult-derived responses). - Update
EmptyResult.Instanceto represent a completed response and reuse it at call sites. - Expand server/client tests to assert
"complete"is present after deserialization for covered result types.
Reviewed changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
| tests/ModelContextProtocol.Tests/Server/McpServerTests.cs | Adds assertions that deserialized results include ResultType == "complete" across many server response paths. |
| tests/ModelContextProtocol.Tests/Client/July2026ProtocolConnectionTests.cs | Adds ResultType == "complete" assertions for server/discover results to validate July 2026 behavior. |
| src/ModelContextProtocol.Core/Server/McpServerImpl.cs | Sets ResultType explicitly for initialize/discover and adds handler-level fix-ups to default missing result types to "complete" (and "task" for task creation results). |
| src/ModelContextProtocol.Core/Protocol/Result.cs | Updates documentation wording around resultType semantics (currently introduces a doc inconsistency). |
| src/ModelContextProtocol.Core/Protocol/EmptyResult.cs | Updates EmptyResult.Instance to be pre-initialized as a completed result (ResultType = "complete"). |
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halter73
previously approved these changes
Jul 7, 2026
halter73
reviewed
Jul 7, 2026
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added 2 commits
July 12, 2026 16:41
Fill resultType=complete on the logging/setLevel path when a custom handler returns a result without it, matching the other server response paths. Add raw-response coverage for logging/setLevel and for the task-augmented handler filling resultType=task when a handler omits it.
Adding resultType to the logging/setLevel response breaks the MCP
conformance suite, which requires that response to be exactly {}. The
method is a 2025-06-18 endpoint removed in 2026-07-28 and is already
gated off (MethodNotFound) on July2026 and later, so on every version
where it is served the schema has no resultType. Return the handler
result as-is and assert the response is exactly {} with no resultType.
tarekgh
approved these changes
Jul 13, 2026
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Summary
resultType#1676, including server/discoverValidation
Fixes #1676