Codex sandbox sessions now auto-run a finish pipeline after the agent exits: claim+commit changed files, push/create PR, attempt merge, prune worktree, and pull base updates when merge completes. The docs now codify this as the default completion protocol, and tests cover the new happy path while preserving dirty-worktree safety behavior.

Constraint: Repos without an origin remote must not fail; auto-finish now skips merge/PR and keeps manual flow available
Rejected: Always forcing merge/PR regardless of remote/gh availability | breaks local-only and offline workflows
Confidence: high
Scope-risk: moderate
Reversibility: clean
Directive: Keep agent-branch-finish as the single merge/cleanup authority; codex-agent should orchestrate, not duplicate finish logic
Tested: npm test
Tested: node --check bin/multiagent-safety.js
Tested: npm pack --dry-run
Not-tested: End-to-end merge conflict review path against live GitHub checks/permissions