Before Tool Definitions Input • AI Agent SDK

BeforeToolDefinitionsInput: Input for BeforeToolDefinitions hooks.

BeforeToolDefinitionsInput

Defined in the events module.

Input for BeforeToolDefinitions hooks.

Fired right after the advertised tool definitions are assembled for a request and before they reach the LLM. Hooks should modify or filter the `tool_definitions list in place (e.g. data.tool_definitions[:] = ...`) to redact parameters, append usage guidance to descriptions, or constrain the advertised schema per request. This mirrors how BEFORE_LLM mutates its payload in place; only in-place mutations are adopted by the runtime.

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