version: 1.0
description: CASAN model/tool fallback policy

routes:
  - step_pattern: "review|test|security"
    primary: primary-model
    fallback: verifier-model
    max_attempts: 2
    fallback_on:
      - nonzero_exit
      - empty_output
      - timeout

  - step_pattern: "implement|write_code|deploy"
    primary: primary-model
    fallback: conservative-model
    max_attempts: 1
    fallback_on:
      - nonzero_exit
      - policy_reject
    governance_required: true

default_route:
  primary: primary-model
  fallback: fallback-model
  max_attempts: 2
  fallback_on:
    - nonzero_exit
    - empty_output

evidence:
  trace_dir: .specify/logs/trace
  fallback_log: .specify/logs/level5/fallback.jsonl