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v3

latestOpenAPI 3.1.02026-08-087684214.2 KB
agents

Update Agent

Update an agent's configuration.

Use this to change voice mode, system prompt, greeting, or voice. Switching voiceMode to "hosted" re-provisions the voice agent with built-in LLM.

patch/v1/agents/{agent_id}

Path parameters

agent_idstring required

Request body

namestring nullable
descriptionstring nullable
voiceMode'webhook' | 'hosted' nullable
enableMessagingboolean nullable

When true, hosted-mode agents can send and read SMS/iMessage during calls.

modelTier'turbo' | 'balanced' | 'max' nullable
systemPromptstring nullable
beginMessagestring nullable
voicestring nullable
transferNumberstring nullable
voicemailMessagestring nullable
callScreeningIdentitystring nullable
callScreeningPurposestring nullable
sttMode'fast' | 'accurate' nullable

Speech-to-text mode. 'fast' optimizes for latency, 'accurate' optimizes for transcription accuracy (~200ms additional latency).

ambientSound'none' | 'office' | 'coffee-shop' | 'outdoor' nullable

Background ambience to mask synthetic silence between turns. 'none' disables; 'office', 'coffee-shop', 'outdoor' enable a quiet bed.

denoisingMode'noise-cancellation' | 'noise-and-background-speech-cancellation' nullable

Audio denoising. 'noise-cancellation' (default) handles general noise. 'noise-and-background-speech-cancellation' is more aggressive for callers in cars, cafes, or near TVs ($0.005/min surcharge).

maxSilenceMsinteger nullable

Hang up the call after this many milliseconds of caller silence. Default 600000 (10 min). Raise for IVR/hold-music workflows; lower to fail fast on dead lines. Range 10000 (10s) to 3600000 (1 hour).

voiceSpeednumber nullable

Voice speed multiplier. 1.0 is normal pace; lower slows speech (0.5 is half speed), higher speeds it up (2.0 is double). Range 0.5 to 2.0.

interruptionSensitivitynumber nullable

How easily callers can interrupt the agent. 0 means the agent is never interrupted, 1 means the agent stops at the first sound. Default 0.8. Range 0.0 to 1.0.

enableBackchannelboolean nullable

When true, the agent interjects short filler words like 'uh-huh' or 'mhmm' during longer caller utterances. Set false to keep the agent silent while the caller is speaking.

language'af-ZA' | 'ar-SA' | 'az-AZ' | 'bg-BG' | 'bs-BA' | 'ca-ES' | 'cs-CZ' | 'cy-GB' | 'da-DK' | 'de-DE' | 'el-GR' | 'en-AU' | 'en-GB' | 'en-IN' | 'en-NZ' | 'en-US' | 'es-419' | 'es-ES' | 'fa-IR' | 'fi-FI' | 'fil-PH' | 'fr-CA' | 'fr-FR' | 'gl-ES' | 'he-IL' | 'hi-IN' | 'hr-HR' | 'hu-HU' | 'hy-AM' | 'id-ID' | 'is-IS' | 'it-IT' | 'ja-JP' | 'kk-KZ' | 'kn-IN' | 'ko-KR' | 'lt-LT' | 'lv-LV' | 'mk-MK' | 'mr-IN' | 'ms-MY' | 'ne-NP' | 'nl-BE' | 'nl-NL' | 'no-NO' | 'pl-PL' | 'pt-BR' | 'pt-PT' | 'ro-RO' | 'ru-RU' | 'sk-SK' | 'sl-SI' | 'sr-RS' | 'sv-SE' | 'sw-KE' | 'ta-IN' | 'th-TH' | 'tr-TR' | 'uk-UA' | 'ur-IN' | 'vi-VN' | 'yue-CN' | 'zh-CN' nullable

BCP-47 locale that drives the agent's speech recognition and pronunciation. See the enum for the full set of supported codes.

Response

Successful Response

idstring required
namestring required
descriptionstring nullable required
voiceMode'webhook' | 'hosted' required
enableMessagingboolean
modelTier'turbo' | 'balanced' | 'max'
systemPromptstring nullable
beginMessagestring nullable
voicestring required
transferNumberstring nullable
customToolsobject[] nullable
voicemailMessagestring nullable
callScreeningIdentitystring nullable
callScreeningPurposestring nullable
sttMode'fast' | 'accurate'

Speech-to-text mode. 'fast' optimizes for latency, 'accurate' optimizes for transcription accuracy (~200ms additional latency).

ambientSound'none' | 'office' | 'coffee-shop' | 'outdoor'

Background ambience to mask synthetic silence between turns. 'none' disables; 'office', 'coffee-shop', 'outdoor' enable a quiet bed.

denoisingMode'noise-cancellation' | 'noise-and-background-speech-cancellation'

Audio denoising. 'noise-cancellation' (default) handles general noise. 'noise-and-background-speech-cancellation' is more aggressive for callers in cars, cafes, or near TVs ($0.005/min surcharge).

maxSilenceMsinteger

Hang up the call after this many milliseconds of caller silence. Range 10000 (10s) to 3600000 (1 hour). Default 600000 (10 min).

voiceSpeednumber

Voice speed multiplier. Range 0.5 to 2.0. Default 1.0.

interruptionSensitivitynumber

How easily callers can interrupt the agent. Range 0.0 to 1.0. Default 0.8.

enableBackchannelboolean

When true, the agent interjects short filler words like 'uh-huh' or 'mhmm' during longer caller utterances. Defaults to true.

languagestring

BCP-47 locale that drives the agent's speech recognition and pronunciation. Defaults to 'en-US'.

createdAtstring date-time required