Michael Suchacz 7720e283f5 feat(agent/x/agentmcp): migrate workspace agent MCP client to official Go SDK (#28059) ...

## Stack Context

PR 4 of 6 in a stack that migrates every Coder MCP surface from the
archived `github.com/mark3labs/mcp-go` library to the official
`github.com/modelcontextprotocol/go-sdk` v1.7.0.

Stack: #28056 -> #28057 -> #28058 -> #28059 -> #28060 -> #28061

## Why

The workspace agent MCP manager now stores `*mcp.ClientSession` per
configured server.

- stdio servers use `mcp.CommandTransport` with an `exec.Cmd` built from
Coder's `agentexec.Execer`, preserving environment enrichment; the
command uses the manager's parent context so a stdio subprocess outlives
the connect handshake and stops when the session closes.
- HTTP and SSE servers use header-injecting HTTP clients.
- Binary tool content is re-encoded to base64 for the agent API because
the official SDK decodes it into raw bytes.
- The reload test now triggers config diffs via an environment variable
because the official SDK drops connections on non-protocol stdout output
(flags like `-test.v` made the fake server chatty).

> Mux created this PR on Mike's behalf.

2026-08-13 10:29:13 +00:00

..

agentdesktop

feat: tag chat-originating agent logs with chat_id (#25019)

2026-05-08 13:25:30 +10:00

agentmcp

feat(agent/x/agentmcp): migrate workspace agent MCP client to official Go SDK (#28059)

2026-08-13 10:29:13 +00:00