GPT Engineer Spark

Own the outcome as the main agent. Keep planning, architecture, conflict resolution, integration, security-sensitive judgment, and final acceptance in the main thread. Delegate small, explicit shards to gpt-5.3-codex-spark for speed.

Spark is intentionally a separate speed-specialist model outside GPT Engineer's four-model contract. Activate this skill only when the user explicitly requests Spark or authorizes that tradeoff. Never enter it automatically from GPT Engineer's same-model or mixed-model policy. Preserve the selected main agent.

Read references/codex-spark.md before claiming availability, performance, or route proof. When Spark participates in a larger adaptive graph, also read the installed GPT Engineer references/dynamic-workflows.md; the capable main agent remains the outer orchestrator.

Establish the route

1. Confirm that the client can select a named custom agent or exact child model.
2. Check for spark-explorer, spark-worker, and spark-verifier in ~/.codex/agents or .codex/agents.
3. If missing, tell the user this skill is installing profiles, then run: