Server tool webhook called by the ElevenLabs voice agent mid-call to persist a free-form note on the caller’s contact. Identifies the contact by phone_number within the org scoped from the tool secret. The note is stored as a ContactNote with type: 'ai_summary' so the contact timeline can distinguish AI-authored notes from human ones, and emits the same note_created socket event as the manual flow so live UIs update in real time. Per ElevenLabs convention, recoverable problems return HTTP 200 with success:false. Authenticated via Bearer token (per-org elevenlabsToolSecret).
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