> ## Documentation Index > Fetch the complete documentation index at: https://docs.kejue.co/llms.txt > Use this file to discover all available pages before exploring further. # Get Tool > Get a tool by ID. ## OpenAPI ````yaml /openapi.json get /tools/{tool_id} openapi: 3.1.0 info: title: Kejue Public API description: >- The Kejue Public API lets you programmatically create calls, manage campaigns, and retrieve call results. ## Authentication All requests require an API key passed in the `X-API-Key` header: ``` X-API-Key: kej_live_... ``` API keys are scoped to a workspace. Create and manage keys from the Kejue dashboard under **Settings → API Keys**. ## Base URL ``` https://api.kejue.co/api/v1 ``` ## Rate Limits API requests are rate-limited per workspace. If you exceed the limit you'll receive a `429 Too Many Requests` response. ## Errors All error responses follow a consistent format: ```json { "error": "Human-readable message", "code": "ERROR_CODE", "details": {} } ``` version: 1.0.0 servers: - url: https://api.kejue.co/api/v1 description: Production security: - ApiKeyAuth: [] tags: - name: Agents description: >- Create and manage AI agents (personas). Each agent has a name, prompt, voice configuration, and optional tools. Agents are the core building block — attach voice configs, tools, and use them to make calls. - name: Calls description: >- Create outbound calls, retrieve call details and transcripts, and list calls with filtering. Each call is associated with a contact and optionally an agent and campaign. - name: Persona Calls description: >- Create calls with the full agent configuration pre-loaded. Applies the complete settings hierarchy (workspace → agent → campaign → overrides) with all agent tools, tags, scoring, and webhooks inherited automatically. - name: Contacts description: >- Create and manage contacts. Contacts represent the people your agents call. Each contact has a phone number, name, and optional metadata. Supports single creation, bulk import, and CSV upload. - name: Campaigns description: >- Create and manage calling campaigns. Campaigns let you batch-call a list of contacts with shared settings, scheduling, and retry logic. - name: Tools description: >- Create and manage custom HTTP tools that agents can invoke during calls. Tools let agents fetch data, trigger actions, or integrate with external systems mid-conversation. Each tool supports three parameter types: - **Dynamic parameters** — filled by the AI at runtime (visible to the AI) - **Static parameters** — fixed values sent with every invocation (hidden from the AI) - **System parameters** — values injected from the execution context at runtime, such as `call_id`, `contact_id`, or `workspace_id` (hidden from the AI) - name: Voices description: List available voices for use in agent voice configurations. - name: Phone Numbers description: List phone numbers available in your workspace for making outbound calls. - name: Webhooks description: >- Create and manage webhook subscriptions. Receive real-time notifications for call events (started, ended, etc.) at your specified URL. - name: Models description: List available AI models for use in agent voice configurations. paths: /tools/{tool_id}: get: tags: - Tools summary: Get Tool description: Get a tool by ID. operationId: get_tool_tools__tool_id__get parameters: - name: tool_id in: path required: true schema: type: string title: Tool Id responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/ToolResponse' '401': description: >- Missing or invalid API key. Pass a workspace API key in the `X-API-Key` header. content: application/json: example: error: Invalid or missing API key code: UNAUTHORIZED details: {} schema: $ref: '#/components/schemas/ErrorResponse' '404': description: Tool not found in this workspace. content: application/json: example: error: Tool not found code: NOT_FOUND details: tool_id: non_existent_id schema: $ref: '#/components/schemas/ErrorResponse' '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' security: - ApiKeyAuth: [] components: schemas: ToolResponse: properties: id: type: string title: Id name: type: string title: Name display_name: anyOf: - type: string - type: 'null' title: Display Name description: anyOf: - type: string - type: 'null' title: Description tool_type: type: string title: Tool Type http_config: anyOf: - additionalProperties: true type: object - type: 'null' title: Http Config parameters: anyOf: - additionalProperties: true type: object - type: 'null' title: Parameters response_schema: anyOf: - additionalProperties: true type: object - type: 'null' title: Response Schema timeout: type: integer title: Timeout retry_count: type: integer title: Retry Count precomputable: type: boolean title: Precomputable default: false agent_reaction: $ref: '#/components/schemas/AgentReaction' default: speaks created_at: anyOf: - type: string - type: 'null' title: Created At updated_at: anyOf: - type: string - type: 'null' title: Updated At type: object required: - id - name - tool_type - timeout - retry_count title: ToolResponse description: A custom HTTP tool (public-safe response). ErrorResponse: properties: error: type: string title: Error code: type: string title: Code details: anyOf: - additionalProperties: true type: object - type: 'null' title: Details type: object required: - error - code title: ErrorResponse description: Standard error response. example: code: NOT_FOUND details: contact_id: '123' error: Contact not found HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError AgentReaction: type: string enum: - speaks - silent - speaks-once title: AgentReaction description: |- How the voice agent reacts when a tool call fires. Ultravox-specific. Ignored by chat tool-calling. - SPEAKS: agent speaks naturally around the tool call (Ultravox default) - SILENT: agent stays silent until the tool returns - SPEAKS_ONCE: agent speaks at most one filler line during the tool call ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type input: title: Input ctx: type: object title: Context type: object required: - loc - msg - type title: ValidationError securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-Key description: Workspace API key (e.g. `kej_live_...`) ````