inference-hooks changedmanage-claude/inference-hooks
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1313Because the hook runs on Anthropic's servers, after the request leaves the client and before the model runs, it applies to every governed request uniformly, with nothing to install or deploy on user devices.
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15Today the only hook event is `prompt`, which fires once per governed inference request, before inference begins. Response-side enforcement is planned as a later event.
15There are two hook events. `prompt` fires once per governed inference request, before inference begins. `tool_call` fires when Claude's response contains tool calls, before any of them runs, in organizations that have turned on **Validate tool calls**.
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30With **Validate tool calls** on, Claude's tool calls are a third hooked point, which the diagram doesn't show: your AI security server returns one verdict for all the tool calls in a response before any of them runs.
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3032A verdict is a small JSON object: `{"action": "allow"}` lets the request proceed, and a deny carries the user-facing reason. For the full verdict schema, see [Return a verdict](https://platform.claude.com/docs/en/manage-claude/inference-hooks-endpoint#return-a-verdict).
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3234Your AI security server sees what the user sees: transcript text, tool calls and their results, and text extracted from attachments. It never receives raw file or image bytes, system prompts, or Anthropic-internal context.
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7880One hook governs conversations across claude.ai, Cowork, Claude Code, and Claude Tag sessions in your Claude Enterprise organization, whether they run on the web, in the desktop or mobile apps, in the CLI, or in Slack. Inference hooks are not available on Amazon Bedrock or Google Cloud.
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8082Governed requests are the inference requests behind the user's conversation. Ancillary requests, such as conversation title generation, aren't sent to your endpoint, and system prompts and tool definitions are never included in what is sent. Voice mode is not covered.
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84With **Validate tool calls** on, `tool_call` events may leave out calls to some of claude.ai's own tools, such as tools that suggest connectors or skills, give Claude the user's local time, or read the user's own past chats and saved memory. These calls and their results stay in the conversation, so the next `prompt` event from that conversation, if there is one, includes them.
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8286Some features that Anthropic runs for your organization make model calls of their own. Your organization sees the results of those calls but not their transcripts. These calls aren't governed requests and aren't sent to your endpoint. They include the following:
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