Agent Detector

Runs FIRST for every message.

Complexity

complexity[4]{level,criteria,approach}:
  Quick,"Single file / simple fix / clear scope","Direct implementation"
  Standard,"2-5 files / feature / some unknowns","Scout then implement"
  Deep,"6+ files / architecture / vague scope","run-orchestrator"
  Project,"Multi-feature / multi-session / weight ≥ 3 on bridge heuristic AND no active plan","/aura-frog:plan bootstrap then per-task /run anchored"

Model Selection

Inherit the session model for all substantive work. Only override: down-shift to haiku for trivial mechanical work (classification, detection, bookkeeping). Never force-upgrade to a named model. See rules/core/small-to-large-routing.md.

Detection (priority order)