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openapi: 3.2.0
info:
title: SLNG Voice Agents Sessions API
version: 1.0.0
description: 'Public API for managing Voice Agents, dispatching outbound calls, and creating web (non-telephony) sessions.
Base URL: `https://api.agents.slng.ai`'
contact:
name: SLNG Support
email: support@slng.ai
servers:
- url: https://api.agents.slng.ai
description: Production
security:
- bearerAuth: []
tags:
- name: Sessions
description: Web (non-telephony) sessions.
paths:
/v1/agents/{agent_id}/web-sessions:
parameters:
- $ref: '#/components/parameters/AgentIdPath'
post:
operationId: createWebSession
summary: Create web session
description: 'Create a browser session for a voice agent.
This is commonly used for in-browser testing without PSTN.'
tags:
- Sessions
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/AgentWebSessionCreate'
responses:
'200':
description: Web session created.
content:
application/json:
schema:
$ref: '#/components/schemas/AgentWebSessionResponse'
'400':
$ref: '#/components/responses/BadRequestError'
'401':
$ref: '#/components/responses/UnauthorizedError'
'402':
description: Payment required.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
examples:
insufficient-credits:
summary: Organisation balance is depleted
value:
detail: Insufficient credit balance. Please top up credits or upgrade your plan.
'403':
$ref: '#/components/responses/ForbiddenError'
'404':
$ref: '#/components/responses/NotFoundError'
'422':
$ref: '#/components/responses/ValidationError'
'500':
$ref: '#/components/responses/InternalServerError'
'502':
description: Bad gateway.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
examples:
web-session-dispatch-failed:
summary: Upstream dispatch failure
value:
detail: 'Failed to dispatch web session: upstream dispatcher unavailable'
components:
responses:
UnauthorizedError:
description: Unauthorized.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
examples:
unauthorized:
summary: Authentication failed
value:
detail: Authentication is required for this endpoint.
NotFoundError:
description: Not found.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
examples:
not-found:
summary: Resource not found
value:
detail: The requested resource was not found.
InternalServerError:
description: Internal server error.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
examples:
internal-server-error:
summary: Unexpected application error
value:
detail: An unexpected internal error occurred.
ValidationError:
description: Validation error.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
examples:
validation-error:
summary: Request validation failed
value:
detail:
- loc:
- body
- language
msg: Input should be a valid string
type: string_type
BadRequestError:
description: Bad request.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
examples:
bad-request:
summary: Generic bad request
value:
detail: The request could not be processed.
ForbiddenError:
description: Forbidden.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
examples:
forbidden:
summary: Access denied
value:
detail: You do not have access to this resource.
schemas:
ErrorResponse:
type: object
additionalProperties: true
description: 'Error payloads can vary depending on where the error is raised (edge gateway vs backend).
Common shapes include:
- `{ "error": "message" }`
- `{ "detail": "message" }`
- `{ "detail": [ { "loc": [...], "msg": "...", "type": "..." } ] }` (validation)
'
properties:
error:
type: string
detail:
oneOf:
- type: string
- type: array
items:
type: object
UUID:
type: string
format: uuid
example: 550e8400-e29b-41d4-a716-446655440000
AgentWebSessionResponse:
type: object
additionalProperties: false
required:
- call_id
- room_name
- livekit_url
- livekit_token
- max_session_seconds
- message
properties:
call_id:
$ref: '#/components/schemas/UUID'
room_name:
type: string
description: Internal session identifier for advanced browser integrations.
livekit_url:
type: string
description: Browser session transport URL.
livekit_token:
type: string
description: Browser session access token.
max_session_seconds:
type: integer
minimum: 60
message:
type: string
example: Web session created successfully
AgentWebSessionCreate:
type: object
additionalProperties: false
properties:
arguments:
type: object
maxProperties: 32
additionalProperties:
type: string
maxLength: 1024
default: {}
description: Per-session template argument overrides. Maximum 32 keys. Each value may be up to 1024 characters. Combined value payload may not exceed 8192 characters.
participant_name:
type:
- string
- 'null'
description: Optional display name for the web participant.
parameters:
AgentIdPath:
name: agent_id
in: path
required: true
schema:
$ref: '#/components/schemas/UUID'
description: Voice agent ID.
securitySchemes:
bearerAuth:
type: http
scheme: bearer
bearerFormat: API key