The Smallest MCP Server lets you manage, monitor, and operate AI voice agents and calling infrastructure on the Smallest AI platform directly from your IDE.
Agent Management: Create, read, update, duplicate, and archive AI voice agents. Configure name, language, voice, LLM model, prompts, first message, background sound, tools, knowledge base, pronunciation dictionaries, voicemail detection, and more.
Agent Versioning & Drafts: List, rename, compare, publish, or discard drafts. Test drafts via webcall, chat, or telephony before going live. Manage published versions for rollback, update metadata, diff versions, and A/B compare version metrics.
Call Operations: Initiate outbound calls with specific agents and optional per-call variables. Search/filter call logs by status, type, date range, agent, phone number, or campaign. Debug individual calls with full transcripts, errors, analytics, latency metrics, cost breakdown, and event timeline.
Campaign Management: List, create, schedule, start, pause, and delete outbound calling campaigns. Export call logs in JSON or CSV format.
Audience Management: List, create, and delete audiences (contact lists). View, search, add, and remove audience members.
Analytics & Reporting: Access usage stats, call volume timeseries, outcome distribution, agent performance, hourly/daily/weekly metrics, pickup rates, duration stats, concurrency data, attempt cohorts, and A/B version comparisons.
Billing & Credits: Check credit balance, view transaction history, usage breakdown, invoices, and payment methods. Configure auto-reload, billing alerts, view plans, and redeem coupons.
Text-to-Speech & Speech-to-Text: Convert text to audio using Lightning models. Transcribe audio files with support for 32+ languages, speaker diarization, emotion detection, PII redaction, and word timestamps.
Phone Numbers & Voices: List available phone numbers and voices, with filters for gender, language, and cloned voices.
Team Management: Invite members to your organization by email with member or admin role assignment.
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@Smallest MCP Server List all my agents"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
MCP server for the Smallest AI platform. Manage agents, debug calls, view analytics — directly from your IDE.
Requires Node.js 18+. Add this to your MCP config (~/.cursor/mcp.json for Cursor, claude_desktop_config.json for Claude Desktop):
{
"mcpServers": {
"smallest": {
"command": "npx",
"args": ["-y", "@developer-smallestai/smallest-mcp-server"],
"env": {
"ATOMS_API_KEY": "sk_your_key_here"
}
}
}
}Auto-updates to the latest version every time your editor restarts.
Mac / Linux:
curl -fsSL https://raw.githubusercontent.com/smallest-inc/mcp-server/main/install.sh | bashWindows (PowerShell):
irm https://raw.githubusercontent.com/smallest-inc/mcp-server/main/install.ps1 | iexDownloads a standalone binary, prompts for your API key, and configures Cursor + Claude Desktop automatically. Re-run to update.
Open a chat in Cursor or Claude Desktop and type:
Set up the Smallest MCP server for me.
The npm package is @developer-smallestai/smallest-mcp-server.
My API key is: sk_paste_your_key_hereReload your editor, then type: "List all my agents"
Related MCP server: mcp-vapi
Tool | Description |
| Search and list calls with filters for status, type, date range, agent, phone number |
| Get detailed info about a single call — status, transcript, errors, analytics, latency |
| List agents with their configuration, voice, LLM model, and call stats |
| Get full details for a single agent |
| Read an agent's current system prompt and tools |
| Usage statistics — total calls, duration, costs, status breakdown |
| List outbound calling campaigns with status and progress |
| List phone numbers owned by your organization |
| List available voices with gender, language, and model filters |
| Read a multi-agent (Playbooks) agent's SOPs, intent router, and shared auth tools |
| View a branch's pending (unpublished) draft changes |
| Get a single committed revision's metadata and resolved config |
Edits are saved to a branch's draft (agents use the branch/revision model). Pass an optional branch_id to any editing tool — omit it to edit the live branch; if the agent has several branches you'll be asked which one. Run publish_draft once to commit.
Tool | Description |
| Create a new AI voice agent ( |
| Update agent settings — name, prompt, first message, voice, model, language, variables, pre-call API, etc. |
| Add or update an API-call tool the agent can invoke during a call |
| Remove a tool from an agent by name |
| Enable/disable end_call and set a transfer number — agent-level |
| Add SOP playbooks (intent + prompt + scoped API tools + auth level) to a multi-agent |
| Edit, archive, or restore one playbook |
| Set the intent router, conversation guide, and shared weak/strong auth tools |
| Archive (soft-delete) or unarchive an agent |
| Copy an agent |
Tool | Description |
| List the agent's branches (which is live, which have a pending draft) |
| Create a working branch from another branch's head |
| Rename a branch |
| Make a branch's head the live (serving) config |
| Publish (commit) or discard a branch's pending draft |
| List a branch's committed revisions |
| Compare two configs (revisions or a branch draft) |
| Start a test call against a branch's head, its draft, or a specific revision |
Tool | Description |
| Initiate an outbound phone call using a specific agent |
Resource | URI | Description |
Platform Overview |
| Key concepts, call types, statuses, and cost breakdown |
Variable | Required | Description |
| Yes | Your Smallest AI API key |
npm install
npm run dev # run with tsx
npm run build # bundle to dist/Merging to main automatically publishes a new version to npm and GitHub Releases.
Version bumps are automatic based on commit messages:
Commit message contains | Bump | Example |
| minor (0.2.0 → 0.3.0) |
|
| major (0.2.0 → 1.0.0) |
|
Anything else | patch (0.2.0 → 0.2.1) |
|
MIT
Unclaimed servers have limited discoverability.
If you are the server author, to access and configure the admin panel.
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