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API Reference
Assistants

Update an assistant

assistants.update(strid, AssistantUpdateParams**kwargs) -> AssistantUpdateResponse
PATCH/assistants/{id}

Update one or more fields on an existing assistant. Supports partial updates — only the fields you include in the request body will be changed. You can update the prompt, voice, first sentence, name, or any other assistant property without affecting the rest of the configuration.

ParametersExpand Collapse
id: str
after_call_sms_prompt: Optional[str]

Prompt / instructions for the after-call SMS. Supports {{variable}} placeholders. When null, no after-call SMS is sent.

background_sound: Optional[Literal["audio/office.ogg"]]

Ambient background sound to play during the call. null/omitted disables it.

background_sound_volume: Optional[float]

Volume of the ambient background sound (0 = silent, 1 = max).

minimum0
maximum1
calendly: Optional[Calendly]
connection_id: str

The connection ID representing the link between your Calendly account and Revox.

event_type_id: str

The event type ID representing the event type to schedule. (eg: https://api.calendly.com/event_types/b2330295-2a91-4a1d-bb73-99e7707663d5)

call_retry_config: Optional[CallRetryConfig]

Configuration for call retry behavior including time windows, delays, and max iterations. If not provided, defaults will be used.

allowed_days: List[Literal["monday", "tuesday", "wednesday", 4 more]]

Days of the week when calls are allowed, in the recipient's timezone. Default: Monday through Friday.

One of the following:
"monday"
"tuesday"
"wednesday"
"thursday"
"friday"
"saturday"
"sunday"
call_twice_in_a_row: bool

If true and max_retry_attempts >= 2, attempt #2 fires immediately (skipping retry_delay_seconds) when attempt #1 didn't reach a human. Calling-window/allowed-days checks still apply. Only affects the 1→2 transition. Default: false.

calling_windows: Iterable[CallRetryConfigCallingWindow]
calling_window_end_time: str

End time for the calling window in the recipient's timezone (or timezone_override if provided). Format: 'HH:mm' (24-hour) or 'H:mma' (12-hour). Examples: '17:00', '6pm'. Default: '18:00'.

calling_window_start_time: str

Start time for the calling window in the recipient's timezone (or timezone_override if provided). Format: 'HH:mm' (24-hour) or 'H:mma' (12-hour). Examples: '09:00', '10am'. Default: '10:00'.

retry_delay_seconds: int

Delay between retry attempts in seconds. Default: 7200 (2 hours).

exclusiveMinimum0
maximum9007199254740991
max_retry_attempts: int

Maximum number of call retry attempts. Default: 3.

exclusiveMinimum0
maximum9007199254740991
timezone: Optional[str]

Optional IANA timezone identifier to override the automatic timezone detection from phone number. If not provided, timezone is determined from the recipient's phone number country code. Examples: 'America/New_York', 'Europe/Paris'.

custom_tools: Optional[Iterable[CustomTool]]

Custom API tools the assistant can call during conversations. Each tool defines an HTTP endpoint with variable substitution.

body_template: Optional[str]

JSON body template for the request. Use quoted {{variable}} placeholders (e.g. "{{name}}") for dynamic values

description: str

Human-readable description of what the tool does, used by the LLM to decide when to call it

minLength1
headers: Iterable[CustomToolHeader]

HTTP headers to include in the request. Values support {{variable}} placeholders

key: str
minLength1
value: str
input_schema: Iterable[CustomToolInputSchema]

Schema defining the parameters the LLM should extract from the conversation to pass to this tool

name: str
minLength1
required: bool
type: Literal["string", "number", "boolean", 3 more]
One of the following:
"string"
"number"
"boolean"
"enum"
"date"
"datetime"
description: Optional[str]
enum_options: Optional[SequenceNotStr[str]]
method: Literal["GET", "POST", "PUT", 2 more]

HTTP method to use when calling the API endpoint

One of the following:
"GET"
"POST"
"PUT"
"PATCH"
"DELETE"
name: str

Unique tool name in lowercase_snake_case (e.g. check_inventory)

minLength1
query_params: Iterable[CustomToolQueryParam]

Query string parameters appended to the URL. Values support {{variable}} placeholders

key: str
minLength1
value: str
url: str

Full URL of the API endpoint. Supports {{variable}} placeholders for dynamic values

minLength1
email_notification_address: Optional[str]

Email address to receive notifications when a call ends with a matching outcome.

formatemail
email_notification_outcomes: Optional[List[Literal["not_interested", "interested", "completed", 3 more]]]

Which call outcomes trigger an email notification. E.g. ["interested", "completed"].

One of the following:
"not_interested"
"interested"
"completed"
"requested_callback_later"
"requested_callback_new_number"
"do_not_contact"
end_of_call_sentence: Optional[str]

Optional message to say when the agent decides to end the call.

faq_items: Optional[Iterable[FaqItem]]

FAQ items to associate with this assistant. When provided, replaces all existing FAQ items.

answer: str
question: str
first_sentence: Optional[str]

The first sentence to use for the call. This will be given to the LLM

first_sentence_delay_ms: Optional[int]

Delay in milliseconds before speaking the first sentence. Default: 400.

minimum0
maximum9007199254740991
first_sentence_mode: Optional[Literal["generated", "static", "none"]]

How the first sentence should be handled. "generated" means the LLM will generate a response based on the first_sentence instruction. "static" means the first_sentence will be spoken exactly as provided. "none" means the agent will not speak first and will wait for the user.

One of the following:
"generated"
"static"
"none"
from_phone_number: Optional[str]

Override the default outbound phone number for calls placed with this assistant. Must be a phone number owned by the organization in E.164 format (e.g. +1234567890). When null, the organization's default phone number is used.

human_transfer_mode: Optional[Literal["warm", "cold"]]

When transfer_phone_number is set: "warm" (AI bridges) or "cold" (SIP REFER; trunk must allow REFER/PSTN). Omit or null when transfer is disabled.

One of the following:
"warm"
"cold"
ivr_navigation_enabled: Optional[bool]

Enable IVR navigation tools. When enabled, the assistant can send DTMF tones and skip turns to navigate phone menus.

llm_model: Optional[LlmModel]
One of the following:
class LlmModelUnionMember0: …
name: Literal["gpt-4.1", "ministral-3-8b-instruct"]
One of the following:
"gpt-4.1"
"ministral-3-8b-instruct"
type: Literal["dedicated-instance"]
class LlmModelUnionMember1: …
openrouter_model_id: str

The model ID to use from OpenRouter. eg: openai/gpt-4.1

openrouter_provider: str

The provider to use from OpenRouter. eg: nebius, openai, azure, etc.

type: Literal["openrouter"]

Use a model from OpenRouter.

class LlmModelUnionMember2: …
api_key: str

API key sent as Bearer token to the custom endpoint.

minLength1
api_url: str

Base URL for the OpenAI-compatible API, e.g. https://api.together.xyz/v1

formaturi
model_name: str

Model name as expected by the provider, e.g. meta-llama/llama-3-70b

minLength1
type: Literal["custom"]

OpenAI-compatible chat completions API (bring your own endpoint and key).

class LlmModelUnionMember3: …
provider: Literal["openai", "google"]

The provider to use from Realtime. eg: openai, google.

One of the following:
"openai"
"google"
realtime_model_id: str

The model ID to use from Realtime. eg: gpt-4.1

type: Literal["realtime"]

Use a model from Realtime.

realtime_voice_id: Optional[str]

Output voice for the realtime provider (e.g. OpenAI: marin; Gemini: Puck).

minLength1
max_call_duration_secs: Optional[float]

The maximum duration of the call in seconds. This is the maximum time the call will be allowed to run.

max_duration_end_message: Optional[str]

Optional message the agent will say, without being interruptible, when the call reaches its max duration. Kept short so it fits inside the farewell buffer. If not set, the call ends silently.

maxLength150
name: Optional[str]
prompt: Optional[str]

The prompt to use for the call. This will be given to the LLM (gpt-4.1)

sms_enabled: Optional[bool]

Enable SMS tool during calls. When enabled, the agent can send SMS messages to the user on the call.

sms_template: Optional[str]

Hardcoded SMS template to send during calls. When set, this exact text is sent instead of letting the agent generate the message. Supports {{variable}} placeholders.

structured_output_config: Optional[Iterable[StructuredOutputConfig]]

The structured output config to use for the call. This is used to extract the data from the call (like email, name, company name, etc.).

name: str
minLength1
required: bool
type: Literal["string", "number", "boolean", 3 more]
One of the following:
"string"
"number"
"boolean"
"enum"
"date"
"datetime"
description: Optional[str]
enum_options: Optional[SequenceNotStr[str]]
structured_output_prompt: Optional[str]

Custom prompt for structured data extraction. If not provided, a default prompt is used. Available variables: {{transcript}}, {{call_direction}}, {{user_phone_number}}, {{agent_phone_number}}.

thinking_sound: Optional[Literal["city-ambience.ogg", "forest-ambience.ogg", "office-ambience.ogg", 4 more]]

Audio clip to play while the agent is processing a response. One of the built-in LiveKit audio clips; null/omitted disables it.

One of the following:
"city-ambience.ogg"
"forest-ambience.ogg"
"office-ambience.ogg"
"crowded-room.ogg"
"keyboard-typing.ogg"
"keyboard-typing2.ogg"
"hold_music.ogg"
thinking_sound_probability: Optional[float]

Probability [0..1] that the thinking sound plays on any given turn; otherwise the agent is silent while thinking.

minimum0
maximum1
thinking_sound_volume: Optional[float]

Volume of the thinking sound (0 = silent, 1 = max).

minimum0
maximum1
transfer_phone_number: Optional[str]

Phone number to transfer calls to when users request to speak to a human agent in E.164 format (e.g. +1234567890).

voice: Optional[Voice]

The voice to use for the call. You can get the list of voices using the /voices endpoint

id: str

The ID of the voice.

minLength1
provider: Literal["cartesia", "elevenlabs"]

The provider of the voice.

One of the following:
"cartesia"
"elevenlabs"
speed: Optional[float]

The speed of the voice. Range depends on provider: Cartesia 0.6–1.5, ElevenLabs 0.7–1.2. Default is 1.0.

minimum0.6
maximum1.5
volume: Optional[float]

Volume of the voice (Cartesia only). 0.5–2.0, default 1.0. Ignored for other providers.

minimum0.5
maximum2
voicemail_message: Optional[str]

If set, when voicemail is detected the agent will speak this message then hang up; if null, hang up immediately.

voicemail_sms_prompt: Optional[str]

SMS message to send when the call reaches voicemail. Supports {{variable}} placeholders. When null, no SMS is sent on voicemail.

warm_transfer_summary_instructions: Optional[str]

When using warm transfer: extra instructions for the supervisor handoff summary. If null or empty, the API uses the product default briefing when the call is loaded for the agent.

webhook_url: Optional[str]

The webhook URL to call when the call is completed.

ReturnsExpand Collapse
class AssistantUpdateResponse: …
assistant: Assistant
id: str
after_call_sms_prompt: Optional[str]

Prompt / instructions for the after-call SMS. Supports {{variable}} placeholders. When null, no after-call SMS is sent.

background_sound: Optional[Literal["audio/office.ogg"]]

Ambient background sound to play during the call. null disables it.

background_sound_volume: float

Volume of the ambient background sound (0 = silent, 1 = max).

minimum0
maximum1
calendly: Optional[AssistantCalendly]
connection_id: str

The connection ID representing the link between your Calendly account and Revox.

event_type_id: str

The event type ID representing the event type to schedule. (eg: https://api.calendly.com/event_types/b2330295-2a91-4a1d-bb73-99e7707663d5)

call_retry_config: Optional[AssistantCallRetryConfig]

Configuration for call retry behavior including time windows, delays, and max iterations. If not provided, defaults will be used.

allowed_days: List[Literal["monday", "tuesday", "wednesday", 4 more]]

Days of the week when calls are allowed, in the recipient's timezone. Default: Monday through Friday.

One of the following:
"monday"
"tuesday"
"wednesday"
"thursday"
"friday"
"saturday"
"sunday"
call_twice_in_a_row: bool

If true and max_retry_attempts >= 2, attempt #2 fires immediately (skipping retry_delay_seconds) when attempt #1 didn't reach a human. Calling-window/allowed-days checks still apply. Only affects the 1→2 transition. Default: false.

calling_windows: List[AssistantCallRetryConfigCallingWindow]
calling_window_end_time: str

End time for the calling window in the recipient's timezone (or timezone_override if provided). Format: 'HH:mm' (24-hour) or 'H:mma' (12-hour). Examples: '17:00', '6pm'. Default: '18:00'.

calling_window_start_time: str

Start time for the calling window in the recipient's timezone (or timezone_override if provided). Format: 'HH:mm' (24-hour) or 'H:mma' (12-hour). Examples: '09:00', '10am'. Default: '10:00'.

retry_delay_seconds: int

Delay between retry attempts in seconds. Default: 7200 (2 hours).

exclusiveMinimum0
maximum9007199254740991
max_retry_attempts: int

Maximum number of call retry attempts. Default: 3.

exclusiveMinimum0
maximum9007199254740991
timezone: Optional[str]

Optional IANA timezone identifier to override the automatic timezone detection from phone number. If not provided, timezone is determined from the recipient's phone number country code. Examples: 'America/New_York', 'Europe/Paris'.

created_at: object
custom_tools: Optional[List[AssistantCustomTool]]
body_template: Optional[str]

JSON body template for the request. Use quoted {{variable}} placeholders (e.g. "{{name}}") for dynamic values

description: str

Human-readable description of what the tool does, used by the LLM to decide when to call it

minLength1
headers: List[AssistantCustomToolHeader]

HTTP headers to include in the request. Values support {{variable}} placeholders

key: str
minLength1
value: str
input_schema: List[AssistantCustomToolInputSchema]

Schema defining the parameters the LLM should extract from the conversation to pass to this tool

name: str
minLength1
required: bool
type: Literal["string", "number", "boolean", 3 more]
One of the following:
"string"
"number"
"boolean"
"enum"
"date"
"datetime"
description: Optional[str]
enum_options: Optional[List[str]]
method: Literal["GET", "POST", "PUT", 2 more]

HTTP method to use when calling the API endpoint

One of the following:
"GET"
"POST"
"PUT"
"PATCH"
"DELETE"
name: str

Unique tool name in lowercase_snake_case (e.g. check_inventory)

minLength1
query_params: List[AssistantCustomToolQueryParam]

Query string parameters appended to the URL. Values support {{variable}} placeholders

key: str
minLength1
value: str
url: str

Full URL of the API endpoint. Supports {{variable}} placeholders for dynamic values

minLength1
email_notification_address: Optional[str]

Email address to receive notifications when a call ends with a matching outcome.

formatemail
email_notification_outcomes: Optional[List[Literal["not_interested", "interested", "completed", 3 more]]]

Which call outcomes trigger an email notification. E.g. ["interested", "completed"].

One of the following:
"not_interested"
"interested"
"completed"
"requested_callback_later"
"requested_callback_new_number"
"do_not_contact"
end_of_call_sentence: Optional[str]
first_sentence: Optional[str]
first_sentence_delay_ms: int

Delay in milliseconds before speaking the first sentence. Default: 400.

minimum-9007199254740991
maximum9007199254740991
first_sentence_mode: Literal["generated", "static", "none"]
One of the following:
"generated"
"static"
"none"
from_phone_number: Optional[str]

Override the default outbound phone number for calls placed with this assistant. When null, the organization's default phone number is used.

human_transfer_mode: Optional[Literal["warm", "cold"]]

Warm or cold transfer when transfer_phone_number is set; null when transfer is not configured.

One of the following:
"warm"
"cold"
ivr_navigation_enabled: bool

Enable IVR navigation tools. When enabled, the assistant can send DTMF tones and skip turns to navigate phone menus.

llm_model: AssistantLlmModel
One of the following:
class AssistantLlmModelUnionMember0: …
name: Literal["gpt-4.1", "ministral-3-8b-instruct"]
One of the following:
"gpt-4.1"
"ministral-3-8b-instruct"
type: Literal["dedicated-instance"]
class AssistantLlmModelUnionMember1: …
openrouter_model_id: str

The model ID to use from OpenRouter. eg: openai/gpt-4.1

openrouter_provider: str

The provider to use from OpenRouter. eg: nebius, openai, azure, etc.

type: Literal["openrouter"]

Use a model from OpenRouter.

class AssistantLlmModelUnionMember2: …
api_key: str

API key sent as Bearer token to the custom endpoint.

minLength1
api_url: str

Base URL for the OpenAI-compatible API, e.g. https://api.together.xyz/v1

formaturi
model_name: str

Model name as expected by the provider, e.g. meta-llama/llama-3-70b

minLength1
type: Literal["custom"]

OpenAI-compatible chat completions API (bring your own endpoint and key).

class AssistantLlmModelUnionMember3: …
provider: Literal["openai", "google"]

The provider to use from Realtime. eg: openai, google.

One of the following:
"openai"
"google"
realtime_model_id: str

The model ID to use from Realtime. eg: gpt-4.1

type: Literal["realtime"]

Use a model from Realtime.

realtime_voice_id: Optional[str]

Output voice for the realtime provider (e.g. OpenAI: marin; Gemini: Puck).

minLength1
max_call_duration_secs: float

The maximum duration of the call in seconds. This is the maximum time the call will be allowed to run.

max_duration_end_message: Optional[str]

Optional message the agent will say, without being interruptible, when the call reaches its max duration. Kept short so it fits inside the farewell buffer. If null, the call ends silently.

maxLength150
name: str
organization_id: str
prompt: str
sms_enabled: bool

Enable SMS tool during calls. When enabled, the agent can send SMS messages to the user on the call.

sms_template: Optional[str]

Hardcoded SMS template to send during calls. When set, this exact text is sent instead of letting the agent generate the message. Supports {{variable}} placeholders.

structured_output_config: Optional[List[AssistantStructuredOutputConfig]]

The structured output config to use for the call. This is used to extract the data from the call (like email, name, company name, etc.).

name: str
minLength1
required: bool
type: Literal["string", "number", "boolean", 3 more]
One of the following:
"string"
"number"
"boolean"
"enum"
"date"
"datetime"
description: Optional[str]
enum_options: Optional[List[str]]
structured_output_prompt: Optional[str]

Custom prompt for structured data extraction. If not provided, a default prompt is used. Available variables: {{transcript}}, {{call_direction}}, {{user_phone_number}}, {{agent_phone_number}}.

thinking_sound: Optional[Literal["city-ambience.ogg", "forest-ambience.ogg", "office-ambience.ogg", 4 more]]

Audio clip to play while the agent is processing a response. One of the built-in LiveKit audio clips; null disables it.

One of the following:
"city-ambience.ogg"
"forest-ambience.ogg"
"office-ambience.ogg"
"crowded-room.ogg"
"keyboard-typing.ogg"
"keyboard-typing2.ogg"
"hold_music.ogg"
thinking_sound_probability: float

Probability [0..1] that the thinking sound plays on any given turn; otherwise the agent is silent while thinking.

minimum0
maximum1
thinking_sound_volume: float

Volume of the thinking sound (0 = silent, 1 = max).

minimum0
maximum1
transfer_phone_number: Optional[str]

Phone number to transfer calls to when users request to speak to a human agent.

updated_at: object
voice: Optional[AssistantVoice]
id: str

The ID of the voice.

minLength1
provider: Literal["cartesia", "elevenlabs"]

The provider of the voice.

One of the following:
"cartesia"
"elevenlabs"
speed: Optional[float]

The speed of the voice. Range depends on provider: Cartesia 0.6–1.5, ElevenLabs 0.7–1.2. Default is 1.0.

minimum0.6
maximum1.5
volume: Optional[float]

Volume of the voice (Cartesia only). 0.5–2.0, default 1.0. Ignored for other providers.

minimum0.5
maximum2
voicemail_message: Optional[str]

If set, when voicemail is detected the agent will speak this message then hang up; if null, hang up immediately.

voicemail_sms_prompt: Optional[str]

Prompt / instructions for the voicemail SMS. Supports {{variable}} placeholders. When null, no SMS is sent on voicemail.

warm_transfer_summary_instructions: Optional[str]

Warm transfer only: instructions for the supervisor handoff summary; null when not configured or cold transfer.

webhook_url: Optional[str]

The webhook URL to call when the call is completed.

faq_items: Optional[List[AssistantFaqItem]]
answer: str
question: str
id: Optional[str]
needs_human_answer: Optional[bool]
source: Optional[Literal["human", "ai"]]
One of the following:
"human"
"ai"
pending_faq_count: Optional[float]

Update an assistant

import os
from revox import Revox

client = Revox(
    api_key=os.environ.get("REVOX_API_KEY"),  # This is the default and can be omitted
)
assistant = client.assistants.update(
    id="id",
)
print(assistant.assistant)
{
  "assistant": {
    "id": "id",
    "after_call_sms_prompt": "after_call_sms_prompt",
    "background_sound": "audio/office.ogg",
    "background_sound_volume": 0,
    "calendly": {
      "connection_id": "connection_id",
      "event_type_id": "event_type_id"
    },
    "call_retry_config": {
      "allowed_days": [
        "monday"
      ],
      "call_twice_in_a_row": true,
      "calling_windows": [
        {
          "calling_window_end_time": "calling_window_end_time",
          "calling_window_start_time": "calling_window_start_time",
          "retry_delay_seconds": 1
        }
      ],
      "max_retry_attempts": 1,
      "timezone": "timezone"
    },
    "created_at": {},
    "custom_tools": [
      {
        "body_template": "body_template",
        "description": "x",
        "headers": [
          {
            "key": "x",
            "value": "value"
          }
        ],
        "input_schema": [
          {
            "name": "x",
            "required": true,
            "type": "string",
            "description": "description",
            "enum_options": [
              "string"
            ]
          }
        ],
        "method": "GET",
        "name": "name",
        "query_params": [
          {
            "key": "x",
            "value": "value"
          }
        ],
        "url": "x"
      }
    ],
    "email_notification_address": "dev@stainless.com",
    "email_notification_outcomes": [
      "not_interested"
    ],
    "end_of_call_sentence": "end_of_call_sentence",
    "first_sentence": "first_sentence",
    "first_sentence_delay_ms": -9007199254740991,
    "first_sentence_mode": "generated",
    "from_phone_number": "from_phone_number",
    "human_transfer_mode": "warm",
    "ivr_navigation_enabled": true,
    "llm_model": {
      "name": "gpt-4.1",
      "type": "dedicated-instance"
    },
    "max_call_duration_secs": 0,
    "max_duration_end_message": "max_duration_end_message",
    "name": "name",
    "organization_id": "organization_id",
    "prompt": "prompt",
    "sms_enabled": true,
    "sms_template": "sms_template",
    "structured_output_config": [
      {
        "name": "x",
        "required": true,
        "type": "string",
        "description": "description",
        "enum_options": [
          "string"
        ]
      }
    ],
    "structured_output_prompt": "structured_output_prompt",
    "thinking_sound": "city-ambience.ogg",
    "thinking_sound_probability": 0,
    "thinking_sound_volume": 0,
    "transfer_phone_number": "transfer_phone_number",
    "updated_at": {},
    "voice": {
      "id": "x",
      "provider": "cartesia",
      "speed": 0.6,
      "volume": 0.5
    },
    "voicemail_message": "voicemail_message",
    "voicemail_sms_prompt": "voicemail_sms_prompt",
    "warm_transfer_summary_instructions": "warm_transfer_summary_instructions",
    "webhook_url": "webhook_url",
    "faq_items": [
      {
        "answer": "answer",
        "question": "question",
        "id": "id",
        "needs_human_answer": true,
        "source": "human"
      }
    ],
    "pending_faq_count": 0
  }
}
Returns Examples
{
  "assistant": {
    "id": "id",
    "after_call_sms_prompt": "after_call_sms_prompt",
    "background_sound": "audio/office.ogg",
    "background_sound_volume": 0,
    "calendly": {
      "connection_id": "connection_id",
      "event_type_id": "event_type_id"
    },
    "call_retry_config": {
      "allowed_days": [
        "monday"
      ],
      "call_twice_in_a_row": true,
      "calling_windows": [
        {
          "calling_window_end_time": "calling_window_end_time",
          "calling_window_start_time": "calling_window_start_time",
          "retry_delay_seconds": 1
        }
      ],
      "max_retry_attempts": 1,
      "timezone": "timezone"
    },
    "created_at": {},
    "custom_tools": [
      {
        "body_template": "body_template",
        "description": "x",
        "headers": [
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    "email_notification_address": "dev@stainless.com",
    "email_notification_outcomes": [
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    "name": "name",
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    "prompt": "prompt",
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    "transfer_phone_number": "transfer_phone_number",
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}