Can I use Retell AI as a CLI?

Yes. KosmoKrator exposes a Retell AI CLI through kosmo integrations:call and the provider shortcut command. Commands can return JSON for scripts, CI, and coding agents.

Can I expose Retell AI through MCP?

Yes. The KosmoKrator MCP gateway can expose selected Retell AI tools to clients such as Claude Code, Cursor, Codex, and other MCP-compatible tools.

Where are Retell AI credentials stored?

Retell AI credentials are configured in KosmoKrator's local integration settings and reused by CLI, Lua, and MCP gateway surfaces.

Can I deny write access for Retell AI MCP tools?

Yes. Start the gateway with --write=deny for read-only clients, or use ask/allow only for trusted workspaces.

Retell AI MCP Integration for OpenAI Agents SDK

Connect Retell AI to OpenAI Agents SDK through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

7 functions 5 read 2 write Bearer token auth

Submit Retell AI feedback View package source

Connect Retell AI to OpenAI Agents SDK

Attach KosmoKrator integration tools to OpenAI Agents SDK workflows through a local MCP gateway.

Start the KosmoKrator MCP gateway locally and point the OpenAI Agents SDK MCP tool at that process or wrapper. The gateway is local, scoped to this integration, and starts with --write=deny so OpenAI Agents can inspect read-capable tools without receiving write access by default.

Retell AI MCP Config for OpenAI Agents SDK

Use headless JSON commands for CI-style execution and MCP for agent tool discovery.

{
  "mcpServers": {
    "kosmokrator-retell": {
      "type": "stdio",
      "command": "kosmo",
      "args": [
        "mcp:serve",
        "--integration=retell",
        "--write=deny"
      ]
    }
  }
}

Run the Gateway Manually

kosmokrator mcp:serve --integration=retell --write=deny

Why Use KosmoKrator Here

Scoped tools

Expose only Retell AI instead of a broad multi-service tool list.

Local credentials

Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.

Write policy

Start read-only, then opt into ask or allow for trusted workspaces.

Retell AI Tools Visible to OpenAI Agents

OpenAI Agents sees stable MCP tool names generated from the Retell AI integration catalog.

MCP tool	Source function	Type	Description
`integration__retell__retell_list_calls`	`retell.retell_list_calls`	Read	List AI voice calls from Retell. Supports filtering by criteria and cursor-based pagination using before/after timestamps.
`integration__retell__retell_get_call`	`retell.retell_get_call`	Read	Get detailed information about a specific AI voice call, including transcript, duration, and status.
`integration__retell__retell_create_phone_call`	`retell.retell_create_phone_call`	Write	Create a new AI-powered phone call using a Retell AI agent. The agent will handle the conversation automatically.
`integration__retell__retell_list_agents`	`retell.retell_list_agents`	Read	List all AI voice agents configured in Retell AI. Returns agent IDs, names, and configuration details.
`integration__retell__retell_get_agent`	`retell.retell_get_agent`	Read	Get detailed information about a specific AI voice agent, including its model, voice, prompt, and configuration.
`integration__retell__retell_create_agent`	`retell.retell_create_agent`	Write	Create a new AI voice agent in Retell AI. Configure the model, voice, system prompt, and response engine.
`integration__retell__retell_get_current_user`	`retell.retell_get_current_user`	Read	Get information about the currently authenticated Retell AI user. Useful for verifying credentials and account details.

Related Retell AI Pages

Retell AI CLIUse direct JSON commands instead of MCP discovery. Retell AI MCPFull gateway reference and MCP tool names. KosmoKrator for OpenAI AgentsClient-level gateway setup.