Re: [I] [RFC] Support MCP 2026-07-28 input_required through Runtime Interactions [maka]

["me2seeks (via GitHub)" <gi...@apache.org>]

me2seeks commented on issue #4364:
URL: https://github.com/apache/maka/issues/4364#issuecomment-5595604900

   Confirmed the remaining MCP adapter gap at 8d5c4612c (current main). I am continuing to own this issue.
   
   - McpClientManager creates the SDK client with `capabilities: {}` and `inputRequired: { autoFulfill: false }`.
   - Its callTool options have no interaction callback and no inputResponses continuation loop.
   - Runtime form requests, Client Capability interaction forwarding, and Desktop/TUI form surfaces now exist, but these facilities alone do not complete the MCP wire round trip.
   - The existing modern-manager regression `surfaces input_required without silently retrying the tool` explicitly expects UnsupportedResultType and exactly one tools/call. I reproduced that passing rejection test locally on 9cb5cc93c.
   
   A user-reported modern-only stdio ask_user fixture rejects missing elicitation capability before returning a form. Its raw trace has not been independently reproduced here. The generic ProtocolError message alone cannot establish its original error code. `Client Capability provider is unavailable` is a separate invocation/provider availability failure and should not be conflated with this adapter gap or attributed to npm run dev without logs.
   
   Remaining acceptance: advertise form capability only with a working handler; bridge input_required through the Host-owned form interaction; send validated answers and preserved continuation state in subsequent calls; verify accept, decline, cancel, provider loss, and real Desktop/TUI execution. Merely enabling the capability bit is insufficient.
   


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