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* fix(agent): report per-call usage metrics on kickoff results Agent.kickoff() populated result.usage_metrics from the LLM instance's lifetime token accumulator, so counts grew across calls and pooled across agents sharing one LLM object — a second agent's first turn appeared to cost the whole preceding session. Snapshot the accumulator when a kickoff starts and report the delta on the result (guardrail retries included), via the new UsageMetrics.delta_since(). The LLM instance's cumulative counters are untouched: get_token_usage_summary() keeps lifetime totals for crew-level aggregation, and its docstring now states that scope explicitly. Applies to both Agent and the deprecated LiteAgent, sync and async paths. Fixes EPD-177. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * refactor(agent): drop lite_agent.py diff, add guardrail-retry usage test Per review: LiteAgent's kickoff path is no longer used, so the per-call usage snapshot only needs to live in agent/core.py — revert the lite_agent.py changes entirely. This also removes the duplicated _current_usage_summary helper and the instance-attr baseline CodeRabbit flagged. Add the requested guardrail-retry regression test: a guardrail that rejects the first attempt and accepts the second must yield usage_metrics covering both attempts (2x a single-attempt kickoff). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com>