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chore: retire mark3labs/mcp-go dependency (#28061)

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## Stack Context

PR 6 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

With every production surface migrated, this PR removes the mark3labs
dependency entirely and converts the remaining test fixtures.

- Migrates the remaining mark3labs test fixtures (coderd MCP e2e tests,
chatd fixtures, mcpclient fixtures, and the Force On MCP policy tests)
to official stateless SDK servers.
- Removes `github.com/mark3labs/mcp-go` from `go.mod` and drops the
corresponding dependabot ignore entry. Zero references remain repo-wide.
- Updates the MCP docs for the 2026-07-28 protocol: stateless Streamable
HTTP behavior, the supported 2024-11-05 through 2026-07-28 protocol
range, and explicit non-features (resources, prompts, structured output,
elicitation, MCP Tasks).
- The e2e ping assertion is removed because MCP 2026-07-28 removed the
ping method.

> Mux created this PR on Mike's behalf.
This commit is contained in:
Michael Suchacz
2026-08-13 10:47:14 +00:00
committed by GitHub
parent c8e8b21a88
commit e92fd8e96f
13 changed files with 503 additions and 835 deletions
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docs/ai-coder/ai-gateway/mcp.md
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@@ -19,7 +19,7 @@ AI Gateway can connect to MCP servers and inject tools automatically, enabling y
> [!NOTE]
> Only MCP servers which support OAuth2 Authorization are supported currently.
>
> [_Streamable HTTP_](https://modelcontextprotocol.io/specification/2025-06-18/basic/transports#streamable-http) is the only supported transport currently. In future releases we will support the (now deprecated) [_Server-Sent Events_](https://modelcontextprotocol.io/specification/2025-06-18/basic/transports#backwards-compatibility) transport.
> [_Streamable HTTP_](https://modelcontextprotocol.io/specification/2026-07-28/basic/transports) is the only supported transport currently. In future releases we will support the (now deprecated) [_Server-Sent Events_](https://modelcontextprotocol.io/specification/2025-06-18/basic/transports#backwards-compatibility) transport.
AI Gateway makes use of [External Auth](../../admin/external-auth/index.md) applications, as they define OAuth2 connections to upstream services. If your External Auth application hosts a remote MCP server, you can configure AI Gateway to connect to it, retrieve its tools and inject them into requests automatically - all while using each individual user's access token.
docs/ai-coder/mcp-server.md
+10
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@@ -87,6 +87,16 @@ The remote MCP server is an HTTP endpoint exposed by your Coder deployment at
`/api/experimental/mcp/http`. This enables MCP clients to connect to Coder
without running the CLI locally.
The endpoint implements the
[Streamable HTTP transport](https://modelcontextprotocol.io/specification/2026-07-28/basic/transports)
in stateless mode: it supports MCP specification versions from `2024-11-05`
through `2026-07-28`, does not issue `Mcp-Session-Id` headers, and answers
`GET` and `DELETE` with `405 Method Not Allowed` (there is no standalone
server-event stream or explicit session termination, both permitted by the
specification). The server exposes tools only; MCP resources, prompts,
structured tool output, elicitation, and the MCP Tasks extension (which is
unrelated to Coder's task tools) are not implemented.
### Prerequisites
The remote MCP HTTP endpoint requires both the `oauth2` and `mcp-server-http`