> 🤖 This PR was modified by Coder Agents on behalf of Jake Howell.
Until we meet again.
## Stack
- #27636
- #27718
- #27719
- #27722
- #27723
- #27724
- #27728
- #27730
- #27732
- #27762
- #27763
- #27786
- #27787
- #27788
- #27789
- #27790
- #27791
- #27817
- #27820
- #28009
## Final removal (`c39b664`)
Removes the last of MUI and Emotion now that every surface has been
migrated:
- **Dependencies**: drops `@mui/material` and
`@emotion/{cache,css,react,styled}` from `package.json` /
`pnpm-lock.yaml`, and deletes the `@types/emotion.d.ts` and
`@types/mui.d.ts` module augmentations.
- **Theming**: replaces the Emotion `CacheProvider`, MUI `ThemeProvider`
/ `StyledEngineProvider`, and `CssBaseline` in `ThemeProvider` with a
lightweight `theme/context.tsx` that exposes `ThemeContextProvider` and
a `useTheme` hook.
- **Global styles**: moves the base `body` styles (background, text
color, font, antialiasing) that `CssBaseline` previously provided into
`index.css`, and drops the temporary MUI modal/popover scrollbar-gutter
workaround.
- **Cleanup**: removes the MUI → shadcn / Emotion → Tailwind migration
guidance from `site/AGENTS.md`, updates the Storybook `preview.tsx`, and
adjusts assorted components (`Command`, `Slider`, `Switch`, `Tabs`,
`SyntaxHighlighter`, timing charts) and theme files to consume the new
context instead of MUI/Emotion.
## 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 pull-request moves using to using the plain `radix-ui` package over
`@radix-ui/react-*` packages. Put simply, now we're not going to run
into issues with inconsistent radix dependencies. This will have no
effect to how the code is built, but will give us a single place to
import from.
This PR reverts github.com/mark3labs/mcp-go to 0.32.0, which was the
version used by https://github.com/coder/coder/pull/18670 that
introduced MCP HTTP support in Coder, and ensures dependabot doesn't
upgrade it automatically.
A bug has been introduced in a recent version of mcp-go that causes some
HTTP MCP requests to fail with the error message
```
[erro] coderd.mcp: Failed to handle sampling response: no active session found for session mcp-session-e3cb7333-284f-46bd-a009-d611f1b690f6
```
The bug may be related to this issue:
https://github.com/mark3labs/mcp-go/issues/554.
* chore: Improve project-wide prettier formatting and ignored files
* chore: `Run make fmt/prettier`
* Fix gitignore for `.vscode` folder so that ! works
* Add comment in `.prettierrc.yaml` to explain `.editorconfig`
* Remove scripts/apidocgen/markdown-template/README.md
* Use `yq` for processing prettierrc, update lib.sh dependency check
* Add `yq` to Dockerfile and Nix
Jake Howell