Agentline.cloud
Add phone call and SMS capabilities to AI agents
Install & Use
Copy this prompt and send it to your AI assistant (Claude / Cursor / TRAE / Codex / WorkBuddy etc.) to auto-install:
Help me install this AI Skill: Agentline.cloud. It is used for: Add phone call and SMS capabilities to AI agents Full Skill content: https://321skill.com/skills/agentline-cloud-x-6/raw/index.md Read that page and install it.
The prompt includes a link to the full Skill content. You can also view the full content.
This Skill addresses the issue where AI agents cannot directly communicate with the outside world via phone calls. In practical development, developers often need to equip their agents with capabilities such as making calls, receiving SMS, and managing phone numbers and agents. However, building a complete telephony infrastructure (SIP trunking, IVR, call recording, etc.) is costly and time-consuming. AgentLine Cloud provides an out-of-the-box telephony API, enabling AI agents to obtain real phone numbers and voice call capabilities within minutes.
Usage is straightforward: simply obtain an API key from the AgentLine platform, then use natural language instructions to have the AI agent complete the entire setup. It will sequentially check the API key, create an Agent, select an area code and purchase a number, set voice preferences (male/female), and finally launch a background event poller to listen for incoming calls and SMS. After that, you can directly say "Call Mr. Wang to confirm the appointment" or "Check the most recent SMS received," and the AI agent will automatically call the corresponding APIs to perform the actions.
It is well-suited for teams or individuals that need to communicate with customers over the phone, especially in scenarios like customer service centers, telemarketing, outbound surveys, and order confirmation. For developers already using AI coding assistants (like Claude or Cursor), they can integrate telephony capabilities directly within the conversation, eliminating the need for additional server development or Webhook setup, significantly lowering the barrier to telephony automation.
It is recommended to follow the setup steps strictly during initial use and not skip launching the event poller, otherwise all incoming calls and SMS will be lost. Note that the system prompt is completely replaced, not appended; before each call, all context (personality, instructions, current information) must be placed in the prompt. Additionally, the service relies on the AgentLine cloud platform, and API keys must be kept secure to avoid leakage.
Key Features
Unlike traditional telephony APIs such as Twilio, AgentLine is specifically designed for AI Agents and operates in a hosted mode—the AI agent autonomously handles voice conversations, eliminating the need for developers to maintain servers or process Webhook callbacks. Developers only need to create calls via the API and retrieve transcriptions.
Limitations
Relies on the AgentLine cloud service; requires a valid API key (starting with sk_live_), and the background event poller must be continuously running to receive incoming calls and SMS. Cannot be used in offline environments.
FAQ
How do I obtain an AgentLine API key?
Visit https://agentline.cloud to register or log in, and obtain a key starting with sk_live_ from the dashboard.
What voice types are supported?
Includes three built-in presets: female-1, female-2, male-1. Also supports any Cartesia voice UUID.
Installation guide for AI assistants
If your AI coding assistant (Claude Code, Cursor, TRAE etc.) can see this page, send it this message to auto-install:
Visit https://321skill.com/skills/agentline-cloud-x-6/raw/index.md to read the original Skill definition (Markdown format) for Agentline.cloud, and install it according to the instructions.
Raw Markdown URL for AI: /skills/agentline-cloud-x-6/raw/index.md