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2b6fcdbb80
Stage billing previously counted only the parent session's own LLM calls. SubAgentResult carried no usage, so when a stage completed, the authoritative billing replaced the live event-accumulated total with a main-session-only number and every child session's spend vanished. On a real run this collapsed a ~$175 total to ~$10. Fix, part 1 — child spend reaches the parent's totals: - SubAgentSupervisor keeps a spend ledger (SessionSpend). The child runner records last_input_usage/last_input_cost after every generation, including failed turns. - The parent session drains the ledger into its input totals before publishing them, so AgentApiBackend::record_input_usage bills the whole session tree. Nested subagents compose: grandchildren drain into the child, whose runner records into the parent. Fix, part 2 — the live number rides the same data: - Each session emits a monotonic lifetime counter of its own spend (session_spend on AssistantMessage, session_billing on agent.message events, spec'd in fabro-api.yaml). - The projection keeps the latest counter per session at the run level and attributes only the delta to the stage a message belongs to, so dropped or replayed events can no longer lose or double-count spend, and sessions reused across stages (shared threads) bill each stage for exactly its own turns. Legacy events without the counter fall back to per-message summing. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> |
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