When the Paperclip server is started from within a Claude Code session
(e.g. `npx paperclipai run` in a Claude Code terminal), the `CLAUDECODE`
and related env vars (`CLAUDE_CODE_ENTRYPOINT`, `CLAUDE_CODE_SESSION`,
`CLAUDE_CODE_PARENT_SESSION`) leak into `process.env`. Since
`runChildProcess()` spreads `process.env` into the child environment,
every spawned `claude` CLI process inherits these vars and immediately
exits with: "Claude Code cannot be launched inside another Claude Code
session."
This is particularly disruptive for the `claude-local` adapter, where
every agent run spawns a `claude` child process. A single contaminated
server start (or cron job that inherits the env) silently breaks all
agent executions until the server is restarted in a clean environment.
The fix deletes the four known Claude Code nesting-guard env vars from
the merged environment before passing it to `spawn()`.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
9248881d42