Contract 规则示例

硬上限(Hard cap)

- id: hard-cap-stop
  when:
    budget_id: <uuid>
    claim_amount_atomic_gt: "1000000000"
  then:
    decision: STOP
    reason_code: BUDGET_EXHAUSTED

超过阈值走审批门(Approval gate)

- id: large-spend-approval
  when:
    budget_id: <uuid>
    claim_amount_atomic_gte: "100000000"   # $100 in micro-USD if budget is USD
  then:
    decision: REQUIRE_APPROVAL
    reason_code: AMOUNT_OVER_THRESHOLD
    approver_role: tenant-admin

按 provider 维度 DENY(占位;取决于规则分类体系的扩展)

# Future syntax — POC doesn't yet support context fields beyond claim
# amount and budget_id. Tracked in the v1 spec.

目前请把按 provider 维度的规则放到应用边界处理(Pydantic-AI 的 claim_estimator 针对不同 provider 返回不同的 unit_id)。参见 pricing-and-usd。