Unclear What this changes for someone running a self-hosted runner is not clear.
What
The self-hosted runner is the program that runs Claude Code sessions on your own machines. It now starts a tool host for child processes of the kind tool-server. It also hands each child process information about its checkouts (copies of a code repository), when those checkouts started, and the session's folder.
Why
This is groundwork in the self-hosted runner for sessions that use tool servers.
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What this changes for someone running a self-hosted runner is not clear.