@ai-sdk/harness-claude-code: last-step finish-step usage is the whole turn's cumulative total, not that step's own usage Minimal reproduction. npm install && npm run repro — no API key needed, it drives the package's own bridge event-processing code against a synthetic (but protocol-accurate) Claude Code CLI stream. On any turn with two or more model calls (i.e. any turn with at least one tool round trip before the final answer — subagents not required), the finish-step part emitted for the last step reports the whole turn's cumulative usage (every step summed) instead of that step's own usage