mcp: implement sampling with tools (#699)

Summary

Add support for tool use within sampling requests, as described in the
MCP 2025-11-25 spec's sampling.tools capability.
  New types

  Content types:
- ToolUseContent — represents a tool invocation request from the
assistant
- ToolResultContent — represents the result of a tool invocation, with
nested []Content for the result blocks

  Capability types:
  - SamplingCapabilities gains Tools and Context sub-fields
  - SamplingToolsCapabilities, SamplingContextCapabilities

  Tool-enabled sampling (parallel tool calls):
- CreateMessageWithToolsParams with SamplingMessageV2 (supports array
content)
  - CreateMessageWithToolsResult (supports array content)
  - ToolChoice — controls tool invocation mode (auto, required, none)
  - ServerSession.CreateMessageWithTools
  - ClientOptions.CreateMessageWithToolsHandler

  Design

Following the TypeScript SDK's pattern, tool-enabled sampling uses
separate types from basic sampling to avoid breaking the existing API.
The basic CreateMessage/CreateMessageResult path
   is unchanged.

Both paths share the same wire method (sampling/createMessage) and go
through the method info table. The table uses the broader
CreateMessageWithToolsResult type internally;
CreateMessage downconverts (erroring if multiple content blocks are
returned). This is documented as a rough edge to unify in v2.

Setting CreateMessageWithToolsHandler automatically infers the
sampling.tools capability. It is a panic to set both
CreateMessageHandler and CreateMessageWithToolsHandler.

  References

-
https://modelcontextprotocol.io/specification/2025-11-25/client/sampling
- TypeScript SDK: CreateMessageResultWithToolsSchema /
CreateMessageRequestParamsWithTools

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

mcp/requests.go

@@ -24,6 +24,7 @@ type (
 
 type (
 	CreateMessageRequest                   = ClientRequest[*CreateMessageParams]
+	CreateMessageWithToolsRequest          = ClientRequest[*CreateMessageWithToolsParams]
 	ElicitRequest                          = ClientRequest[*ElicitParams]
 	initializedClientRequest               = ClientRequest[*InitializedParams]
 	InitializeRequest                      = ClientRequest[*InitializeParams]