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 Generic MCP Clients

Connect Retell AI to Generic MCP Clients through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

7 functions 5 read 2 write Bearer token auth

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Connect Retell AI to Generic MCP Clients

Connect any stdio-compatible MCP client to local KosmoKrator integration tools.

Register kosmo mcp:serve as the command for a local stdio MCP server. The gateway is local, scoped to this integration, and starts with --write=deny so MCP clients can inspect read-capable tools without receiving write access by default.

Retell AI MCP Config for Generic MCP Clients

Start with read-only write policy and expand only for trusted projects.

{
  "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 MCP clients

MCP clients 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 MCP clientsClient-level gateway setup.