One read of Claude Developer Platformapi-20261009T163711Z
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managed-agents/session-observability Changed · +1 / -1 lines
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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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managed-agents/tools Changed · +2 / -0 lines
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498498 ```
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501A custom tool's name can't start with `mcp__` or `ant__`, or match the name of a built-in agent tool. A request that breaks this rule returns a 400 error. An agent that already has a custom tool whose name starts with `ant__` accepts an update only if the update sends `tools` without that name, so rename or remove the tool in your next update. A new session is refused with a 400 error if such a tool is on its agent (after any [overrides](https://platform.claude.com/docs/en/managed-agents/sessions#override-agent-configuration-for-a-session)), on an agent in `subagents.predefined_agents`, or on an agent in `workflows.predefined_agents`. Sessions that already exist aren't affected.
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501503The agent calls its custom tools during a session. To receive the calls and return results, see [Session event stream](https://platform.claude.com/docs/en/managed-agents/events-and-streaming#handling-custom-tool-calls).
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503505For sessions that run in a self-hosted sandbox, the environment worker can [serve custom tools from the sandbox](https://platform.claude.com/docs/en/managed-agents/self-hosted-sandboxes-custom-tools). These can include tools that wrap an MCP server inside your network.