platform_info mints dps_…; the model threads it. Go SDK v1.7.0, MCP 2026-07-28.

starlark-go in a Go server: FileOptions, host bindings, and a cancel watchdog

I drove my own platform as a real client and told it to find every place a tool said one thing and did another. A case study in MCP SDLC.

Steering agents from the server middleware instead of the tool descriptions.

Compose mcp-trino, mcp-datahub, and mcp-s3 as Go libraries behind one endpoint, instead of running three servers that can't see each other.

An MCP server faces an agent on both sides. Go lets me leash the agent that writes it and harden the contract the agent reads.