What problem does it solve? Shelling out from one AI coding assistant to another agent CLI (Codex, Claude Code, Cursor Agent, OpenCode) is error-prone: flags differ per CLI, model ids change without notice, stdin stalls hang runs, and sessions get resumed by accident. This Skill provides verified invocation patterns so cross-CLI delegation works correctly. ## Core Features & Use Cases - Per-CLI invocation references: Detailed guides for codex exec, Cursor agent -p, claude -p, and opencode run, covering preconditions, model/effort mapping, isolation, resume, and structured output. - Invocation contract: Universal rules such as prompt-last with empty stdin, explicit session-id resume, artifact hygiene, and never inventing model ids or flags. - Long-run supervision: Guidance for capturing PIDs, polling cadence, exit-status collection, and usage-limit handling. - Use Case: From Claude Code, delegate a read-only code review to Codex with a specific model and reasoning effort, capture the JSON artifact, then resume the same session to apply fixes. ## Quick Start Ask the agent to dispatch a review task to another installed agent CLI such as Codex or Cursor Agent using a specific model and effort level.