Claude Code workflow (.github/workflows/claude.yml) and .mcp.json lost in the v2 tree swap — @claude no longer triggers #1850

Same regression class as #1843 (SECURITY.md): the v2 tree swap in #1817 replaced the default branch's tree, and .github/workflows/claude.yml did not exist in the v2 tree, so it was silently removed from main.

Two files are missing, not one — claude.yml and the .mcp.json it depends on. See Scope below.

Impact

@claude mentions no longer trigger anything, repo-wide — on any PR or issue. issue_comment / pull_request_review_comment / issues events always run workflows from the default branch, so the loss on main disables the integration everywhere, including for PRs targeting v2/main.

Evidence

• The workflow's API state is now deleted:

  gh api repos/modelcontextprotocol/inspector/actions/workflows/173749385 --jq "{name, path, state}"
  # => {"name":"Claude Code","path":".github/workflows/claude.yml","state":"deleted"}

• Its last three runs (all issue_comment, latest 2026-07-28T03:10:05Z) are skipped.
• The last commit carrying the file, ac3c1a12 ("Bump to version 1.0.0", Bump to version 1.0.0 #1720), is not an ancestor of current main.
• .github/workflows/ on main today contains only main.yml.
• Reproduced live: two @claude review comments on fix(core): mirror SEP-2243 x-mcp-header args to Mcp-Param-* on tools/call #1847 (19:08 and 19:10 UTC) produced no bot reply and no workflow run.

The last successful run was on #1825 (run 30315124707), which is where the file content can be recovered from:

gh api "repos/modelcontextprotocol/inspector/contents/.github/workflows/claude.yml?ref=ac3c1a12" --jq .content | base64 -d

Scope

Restoring the workflow alone is not enough. It runs with:

--mcp-config .mcp.json
--allowedTools "Bash,mcp__mcp-docs"

.mcp.json registers the mcp-docs HTTP server (https://modelcontextprotocol.io/mcp), and it went missing in the same swap — it survives only on v1/main and is absent from both main and v2/main:

git ls-tree --name-only origin/main .mcp.json     # (empty)
git ls-tree --name-only origin/v2/main .mcp.json  # (empty)
git ls-tree --name-only origin/v1/main .mcp.json  # .mcp.json

Without it the mcp__mcp-docs tools never resolve, so the workflow's MCP-documentation lookups — the thing --append-system-prompt explicitly instructs it to use for MCP-related reviews — silently do nothing. Both files must land together.

Fix

Restore both files byte-for-byte, to v2/main:

The @claude trigger is gated to OWNER / MEMBER / COLLABORATOR author associations, which remains the behavior we want under the issues-only contribution model (#1820).

Target branch: v2/main, not main. v2/main is the develop branch merged into main at milestone releases, so restoring to main alone would be undone by the next tree swap — exactly how these files were lost. The trade-off is that @claude stays non-functional until the next milestone merge reaches main, since issue_comment events only consult the default branch. If it's needed sooner, that wants a separate direct-to-main PR in addition to this one.

Related

SECURITY.md (#1843, and #1864 for the v2/main half), claude.yml, and .mcp.json are now three instances of one pattern, none caught by CI. A systematic sweep of what else the swap dropped is worth doing separately — since the two histories share no common ancestor, no git tooling will surface them on its own.