claude plugin eval fails every run with E2BIG when the plugin root has a large node_modules #109197

Claude Code 2.1.293 · macOS (Darwin 24.5.0) · Node 24.15.0

Steps

1. A plugin repo with a pnpm-installed node_modules at the root (334 MB).
2. claude plugin eval . --eval-dir tests/plugin-evals --trust-plugin --no-publish --runs 1

Result
Every run, including the no-plugin baseline arm, ends with turns: 0 and
error: "E2BIG: argument list too long, posix_spawn '<node>/lib/node_modules/@anthropic-ai/claude-code/bin/claude.exe'".
A one-line "say hello" case fails the same way.

Narrowing it down (copies of the same repo)

• without .git and node_modules: runs fine
• with .git added back: runs fine
• with node_modules added back: E2BIG

Workaround: rsync the repo without node_modules to a temp dir and run the eval there.

Expected: the eval runs in the plugin root whether or not node_modules is there.