Which Weave API should I use to trace my agent?

It depends on what you’re building:

• If you’re running an off-the-shelf agent framework (such as Claude Code), install the corresponding Weave integration and tracing happens automatically to the Agents tab.
• If you’re building your own agent with sessions and turns, use the Weave SDK for Agents (weave.start_session, weave.start_turn), which surfaces results in the Agents tab.
• If you’re tracing individual functions or pipelines rather than agent conversations, use @weave.op, which surfaces results in the Traces tab.

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Agents Tracing weave.op