Senpi / pi Coding-Agent Sessions

Observed Senpi layout:

• ~/.senpi/agent/sessions/<encoded-cwd>/<timestamp>_<uuid>.jsonl
• ~/.senpi/agent/settings.json, models.json, and auth.json provide environment context.
• ~/.pi/agent/sessions/** can use the same family of JSONL formats.

Common event types:

• session: includes id, timestamp, and cwd.
• model_change: includes provider and modelId.
• thinking_level_change: includes effort metadata.
• message: wraps provider-native messages, tool calls, usage, and costs.
• custom with customType: senpi.todo-state: stores todo state.

Prefer Senpi usage fields when present: usage.input, usage.output, usage.cacheRead, usage.cacheWrite, usage.totalTokens, and usage.cost.total.