session-observability changedmanaged-agents/session-observability
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8080### Per-thread usage
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82Each [session thread](https://platform.claude.com/docs/en/managed-agents/multiagent-orchestration)'s own `usage` carries `list_cost` and `active_seconds` too. Per-thread figures are rounded independently and exclude the session's running-time cost, so they don't sum exactly to the session's `list_cost`. The session figure is the authoritative one.
82Each [session thread](https://platform.claude.com/docs/en/managed-agents/session-threads)'s own `usage` carries `list_cost` and `active_seconds` too. Per-thread figures are rounded independently and exclude the session's running-time cost, so they don't sum exactly to the session's `list_cost`. The session figure is the authoritative one.
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8484### Read usage from the stream
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