What problem does it solve? Changing a multi-agent marketplace plugin risks breaking every live Claude Code and Codex session on the machine if installs, updates, or marketplace mutations happen carelessly. This Skill enforces a safe verification-and-integration procedure that separates source validation from machine-wide runtime changes. ## Core Features & Use Cases - Candidate Verification: Runs version checks, plugin builds, and validation via the circus CLI before any change is declared complete. - Worktree Safety Gate: Detects linked worktrees and prevents them from becoming persistent marketplace sources, routing integration through the primary checkout. - Runtime Mutation Gate: Blocks claude plugins update, codex plugin add, and marketplace add/remove commands unless the operator explicitly approves them in the current turn. - Use Case: After editing a plugin in a marketplace repo with .claude-plugin/marketplace.json, run this procedure to verify the build, merge the candidate into the primary checkout, and confirm a fresh Codex session picks up the change without touching shared runtime state. ## Quick Start Ask the agent to run the test-before-push procedure to verify the current plugin change and integrate it safely without updating any installed runtimes.
