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Branch start used a timestamped branch every time, so running the launcher from inside an existing agent worktree cloned that sandbox into a nested lane. The command now treats an existing agent/* branch as an attach target by default, with --new/--no-reuse for intentional child lanes. Parser surfaces accept reused branch-start output and a regression locks the no-nested-worktree path. Constraint: Agent launchers must keep the visible checkout stable while allowing manual follow-up sessions inside an active sandbox Rejected: Require prompts to remember cd-only handoffs | too easy for agents to rerun branch start from an existing worktree Confidence: high Scope-risk: moderate Directive: Do not remove the reuse short-circuit without proving codex-agent and branch-start follow-up behavior from inside agent/* worktrees Tested: node --test test/branch.test.js Tested: node --test test/metadata.test.js Tested: npm test Tested: openspec validate agent-codex-reuse-existing-agent-worktree-on-repeate-2026-04-27-18-17 --type change --strict Tested: openspec validate --specs Not-tested: Published npm package install after merge
NagyVikt
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