[hlubek]

Summary

A host composing the shared MCP wrapper can now add tools of its own on the same MCP server and endpoint as SDD's, so agents reach both through one connector (graph entry 20261106-232735-d-tac-d3f).

• mcpapp.Register(server, opts) adds SDD's 14 tools to an *mcp.Server the host constructs. The host owns the server's name and version, instructions, transport, authentication and lifecycle; Register installs no middleware.
• mcpapp.Instructions exports SDD's server instructions text for the host to include in its own.
• mcpapp.New stays the wrapper for compositions without tools of their own: it builds a server named sdd, installs the shutdown middleware and registers onto it. Handler, Run, RunStdio, Connect and Shutdown are unchanged, so sdd serve and the external example keep their code.
• Tool handlers moved from Server onto a private toolSet, independent of the server they are registered on.
• The MCP SDK replaces a same-named tool without error; Register's doc states that host tools must not reuse SDD's tool names (accepted in the directive).

The tool-contract snapshot is unchanged. shutdown_test.go is renamed to shutdown_internal_test.go, since it needs unexported access.

The branch also carries the SDD work-in-progress marker commit for the directive; the closing done removes it.

Test plan

• register_test.go: a host server with SDD's tools plus a host tool lists both, serves the host's name and instructions starting with mcpapp.Instructions, and drives start_session and the host tool over one connection; Register(nil, …) fails
• go vet ./..., devbox run lint, devbox run test (root and examples/extendingsdd) green

🤖 Generated with Claude Code

Confidence Score: 5/5

The PR appears safe to merge; no actionable issues were found.

Summary

Adds mcpapp.Register so hosts can serve SDD’s 14 tools alongside their own tools.

• Hosts can serve SDD’s tools alongside their own on one MCP server.

Acknowledged choices: hlubek explicitly accepts documented tool-name collisions and identifies the WIP marker as intentional.

_{Reviews (1) · Last reviewed commit: "feat(mcpapp): register SDD's tools onto ..." · Reviewed by Greptile}