Logger.Sub(tag) derives a child logger with a new tag from the same
writers, with level inherited from the parent but independently
overridable via OLLIE_{TAG}_LOG.
The agent creates an "audit" sub-logger at startup. Key events are
logged at debug level through it:
audit: call: <tool> <args (truncated)>
audit: result: <tool> <content (truncated)>
audit: error: <message>
audit: turn: start/end with cost and session ID
audit: compact: messages removed, trigger, session ID
Enable with OLLIE_AUDIT_LOG=debug.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Usage events now carry a 4th field (costUSD) so OpenRouter's reported
cost flows through unchanged. For backends that only report token counts
(Anthropic, direct OpenAI, Ollama), cost is computed from a prefix-keyed
pricing table. The higher-fidelity source always wins.
Per turn:
- turnInputTokens/turnOutputTokens/turnCostUSD reset before each turn
- recordTurnCost() stores LastTurnCostUSD, adds to SessionCostUSD
- "costLast=$X.XXXX" emitted as an info event at turn end
Session file "cost" returns costLast/costSession key=value pairs.
Agent interface gains Cost() string.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Levi Neely