Workflow 系列（08）：运营与成本——跨 Phase 成本追踪与故障排查

成本盲区单个 Skill 的成本很容易算：input_tokens × 单价 + output_tokens × 单价。工作流里有 7 个 Phase，每个 Phase 可能有多个子 Agent，Phase 4 还有 3 个并发候选。运行一次工作流到底花了多少钱？大多数团队说不清楚，也就没有办法优化。跨 Phase 成本追踪在状态文件里记录 Token 消耗每次子 Agent 调用完成后，把 Token 消耗记录进workflow_state.json：{"workflow_id":"wf-bug-e2e-AE-33995-20260601","cost_tracking":{"phase_1_jira":{"model":"claude-sonnet-4-6","input_tokens":850,"output_tokens":420,"cost_usd":0.0019},"phase_2_logs":{"model":"claude-sonnet-4-6","input_tokens":3200,"output_tokens":380,"cost_usd":0.0061},"phase_3_analyze":{"model":"claude-opus-4-8","input_tokens":15000,"output_tokens":500,"cost_usd":0.2625},"phase_4_candidate_a":{"model":"claude-sonnet-4-6","input_tokens":8000,"output_tokens":2000,"cost_usd":0.046},"phase_4_candidate_b":{"model":"claude-sonnet-4-6","input_tokens":8100,"output_tokens":1800,"cost_usd":0.0423},"phase_4_candidate_c":