Vapi API Key Setup

Guide the user through obtaining and configuring a Vapi API key for the voice AI platform.

Workflow

Step 1: Request the API key

Tell the user:

To set up Vapi, open the API keys page in the Vapi Dashboard: https://dashboard.vapi.ai/org/api-keys

(Need an account? Create one at https://dashboard.vapi.ai/signup first)

If you don't have an API key yet:

1. Click "Create Key"
2. Name your key (e.g., "development")
3. Copy the key immediately — it is only shown once

Do not paste a private API key into this chat. Save it locally using the steps below, then tell me when the file is ready.

Then wait for the user to confirm that the local environment file is ready. Do not ask them to send or display the key.

Step 2: Validate and configure

Once the user confirms the key is stored locally:

1. Confirm the key is available without printing it. Prefer an existing environment variable. Otherwise, ask the user to save it as VAPI_API_KEY in a local .env.local file using their editor. Never display the file contents.
2. Validate the key by making a request from the environment where it is loaded:

    curl -s -o /dev/null -w "%{http_code}" https://api.vapi.ai/assistant \
      -H "Authorization: Bearer $VAPI_API_KEY"
   

3. If validation fails (non-200 response):
   • Tell the user the API key appears to be invalid
   • Ask them to double-check and try again
   • Remind them of the URL: https://dashboard.vapi.ai/org/api-keys
4. If validation succeeds, confirm that the local environment file contains this variable without showing its value:

   VAPI_API_KEY=<the-api-key>
   

5. Confirm success:

   Your Vapi API key is configured locally as VAPI_API_KEY.

   You can now use Vapi's API to create assistants, make calls, and build voice AI agents.

   Keep this key safe — do not commit it to version control.

Step 3: Verify .gitignore

Check whether .gitignore protects local environment files. If not, add:

.env*
!.env.example

Environment Variable

All Vapi skills expect the API key in the VAPI_API_KEY environment variable. The base URL for all API requests is:

https://api.vapi.ai

Authentication is via Bearer token:

Authorization: Bearer $VAPI_API_KEY

Additional Resources

Vapi provides a documentation MCP server that gives compatible AI agents access to the Vapi knowledge base. Use its documentation search for advanced configuration, troubleshooting, SDK details, and anything beyond this skill.

Manual setup: If your agent doesn't auto-detect the config, run:

claude mcp add vapi-docs -- npx -y mcp-remote https://docs.vapi.ai/_mcp/server

See the Vapi MCP integration guide for setup instructions across supported agents.