Unclear Which process is started this way is not known.
What
When Claude Code starts a certain process, it gives it an environment with npm_config_ignore_scripts set to true. That tells npm, the JavaScript package tool, not to run the scripts packages carry for install and other steps. The way this environment is put together has changed: it is built from a base set of variables plus this one, and in some cases it is not merged with the rest of Claude Code's own environment.
Why
Blocking package scripts is a safety step, because install scripts can run arbitrary commands on your machine.
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Which process is started this way is not known.