Relay

Route the user's task through the coding environment's native child tasks or agents, chosen by role rather than model family:

1. a frontier planner resolves ambiguity and defines the finish line;
2. a cheaper, faster workhorse executor implements the settled plan;
3. a separate frontier reviewer independently checks the result.

The user may supply any model map, for example:

planning: Fable
execution: GPT-5.5
review: GPT-5.6 Sol
save: project

Model names are configuration, never capability claims. The coordinator discovers what the active environment can actually delegate to, classifies those models from current evidence, suggests the route, verifies every handoff, and reports the route actually used.