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.

voice

Retell AI MCP Integration for CrewAI

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

6 functions 4 read 2 write API key auth

Submit Retell AI feedback View package source

Connect Retell AI to CrewAI

Expose KosmoKrator integrations to CrewAI workers as scoped local tools.

Wrap kosmo integrations:call for specific tasks or connect workers to a local MCP gateway. The gateway is local, scoped to this integration, and starts with --write=deny so CrewAI can inspect read-capable tools without receiving write access by default.

Retell AI MCP Config for CrewAI

Use per-worker integration scopes to avoid giving every worker every tool.

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

Run the Gateway Manually

kosmokrator mcp:serve --integration=retell-ai --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 CrewAI

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

MCP tool	Source function	Type	Description
`integration__retell_ai__retell_ai_create_call`	`retell-ai.retell_ai_create_call`	Write	Create a new AI-powered phone call using a Retell AI voice agent. Specify the agent ID and optional metadata to attach context to the call.
`integration__retell_ai__retell_ai_get_call`	`retell-ai.retell_ai_get_call`	Read	Retrieve details for a specific phone call by its ID. Returns call status, duration, transcript, and associated metadata.
`integration__retell_ai__retell_ai_list_calls`	`retell-ai.retell_ai_list_calls`	Read	List phone calls from Retell AI. Returns call records with status, duration, and metadata. Supports optional filters for agent, status, or date range.
`integration__retell_ai__retell_ai_list_agents`	`retell-ai.retell_ai_list_agents`	Read	List all configured voice agents in your Retell AI account. Returns agent IDs, names, voice settings, and other configuration details.
`integration__retell_ai__retell_ai_create_agent`	`retell-ai.retell_ai_create_agent`	Write	Create a new voice AI agent in Retell AI. Specify the voice ID and system prompt. Additional options like agent name, language, and behavior settings can be provided.
`integration__retell_ai__retell_ai_get_current_user`	`retell-ai.retell_ai_get_current_user`	Read	Retrieve current Retell AI account information, including available agents and account status. Useful for verifying connectivity and understanding account capabilities.

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 CrewAIClient-level gateway setup.