flake: Windows CI mise install fails for vercel (node not found)

[flake-investigator]

CI Run

• https://github.com/coder/coder/actions/runs/27624444387
• Job: test-go-pg (windows-2022)
• Failed around 2026-06-16 14:25Z (within minutes of the Slack alert)

Commit

• coder/coder@6ad66be
• Author: Ben Potter

Failure details

Step: .github/actions/go-cache (logged under “Restore Go cache” in the job)

Log excerpt:

mise vercel@54.14.0                      [1/3] install
...
npm error command C:\Windows\system32\cmd.exe /d /s /c node install.js
npm error 'node' is not recognized as an internal or external command,
npm error operable program or batch file.
...
mise ERROR Failed to install npm:vercel@54.14.0: npm.cmd exited with non-zero status: exit code 1

Root cause assessment

mise.toml recently added vercel = "54.14.0" (commit 6ad66be). On Windows CI, mise attempts to install Vercel via npm during setup; npm fails because node is not on PATH ('node' is not recognized). This causes the job to fail before tests run.

Assignment analysis

• git log --oneline -10 mise.toml shows commit 6ad66be (Ben Potter) adding the Vercel tool.
• .github/actions/setup-mise/action.yml was last modified by Thomas Kosiewski (f6a4ed30), but the failure appears tied to the new tool entry in mise.toml.
• Assigning to Ben Potter for triage and ownership of the new tool entry.

Reproduction

• On a Windows runner with current mise.toml, run mise install vercel or the CI setup-mise + go-cache steps.

[linear-code]

ENG-2929

[flake-investigator]

New occurrence on main:

• CI Run: https://github.com/coder/coder/actions/runs/27625483943
• Job: test-go-pg (windows-2022)
• Commit: 0c1c4af40af9425b5c1ff3158c16c6874178f65d (Danny Kopping)

Log excerpt (Restore Go cache step):

mise vercel@54.14.0                      [1/3] install
...
npm error command C:\Windows\system32\cmd.exe /d /s /c node install.js
npm error 'node' is not recognized as an internal or external command,
npm error operable program or batch file.
...
mise ERROR Failed to install npm:vercel@54.14.0: npm.cmd exited with non-zero status: exit code 1

Same failure signature as original issue (missing node on Windows when installing Vercel via mise).