Agents settings (workspace-level): The “Conversation initiation client data webhook” here defines the single webhook endpoint (URL + optional request headers) that ElevenAgents will call at conversation start to fetch per-conversation data (dynamic variables and optional overrides). It applies across the workspace unless your integration supplies its own source. (elevenlabs.io)
Agent page → Security tab (per‑agent): This does not set a webhook URL. It’s where you opt‑in which fields from conversation initiation client data are allowed to override the agent at runtime (e.g., First message, System prompt, LLM/voice). Overrides are disabled by default and must be enabled here; new client‑driven fields (e.g., starting_workflow_node_id) are also gated by Security/platform override settings. (elevenlabs.io)
Supporting docs:
Workspace settings API shows conversation_initiation_client_data_webhook object (url, request_headers). (elevenlabs.io)
Twilio inbound calls use this webhook to return conversation initiation client data (dynamic_variables and overrides). (elevenlabs.io)
Personalization/Overrides docs define the conversation_initiation_client_data payload and note that per‑agent Security must enable specific overrides. (elevenlabs.io)
Changelog notes additional client-init fields are opt‑in via agent platform/Security settings. (elevenlabs.io)
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