Description

Kehrlann

opened on Nov 9, 2026

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Context

In #1013, the plan is for Tasks (SEP-2663) to be a feature of its own that replaces ToolsFeature entirely instead of wrapping it (comment).

To do that without copying ToolsFeature, the logic it applies around a tools/call needs to be reusable.

Proposal

Pull the per-call steps out of ToolsFeature so that another feature can build on them:

• Required client capabilities check (RequiredCapabilities.check)
• Mcp-Param header validation against the tool's annotations
• Input validation against inputSchema (returned as an isError tool result)
• Output validation against outputSchema, and filling in content from structuredContent

ToolsFeature should keep working exactly as it does today, built on top of these pieces.

Out of scope

• The Tasks feature itself (SEP-2663: Tasks Extension #1013)

Activity

1. Kehrlann

   added this to the 2.2.0-M3 milestone on Nov 9, 2026
2. Kehrlann

   added the

   Enhancement

   issue type on Nov 9, 2026
3. Kehrlann

   added

   area/server

   P1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested feature

   P2Moderate issues affecting some users, edge cases, potentially valuable featureModerate issues affecting some users, edge cases, potentially valuable feature

   modernv3 covering the 2026-07-28 specv3 covering the 2026-07-28 spec

   and removed

   P1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested feature

   on Nov 9, 2026
4. neerajbhatt commented on Nov 12, 2026

   

   neerajbhatt

   on Nov 12, 2026

   Contributor

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   Hi @Kehrlann, I’d be interested in working on #1320. I recently raised a PR for #1317. My proposed scope is to make the capability, Mcp-Param, and input/output schema checks in ToolsFeature reusable, with focused tests to preserve its current behavior. I’d leave the Tasks feature itself out of scope. If that aligns with your plan, could you assign this issue to me?

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