What is MCP and do I need to understand it?

MCP (Model Context Protocol) is an open standard that lets AI agents connect to external tools. Think of it as a universal adapter. You don’t need to understand it — just connect Callsy to your AI tool and it works.

Does Callsy work with OpenClaw?

Absolutely. Callsy’s MCP server integrates directly with OpenClaw agents. Add it as a skill and your autonomous agent can create voice personas, initiate calls, and check outcomes — all within the agent loop.

Do I need to be technical to use this?

Not at all. If you can type a sentence, you can use Callsy. Describe your call in plain English.

What does the AI voice sound like?

Natural and conversational — not robotic. You choose from multiple voice profiles and customize tone, pace, and personality to match your brand.

Can the AI handle objections?

Yes. You define the playbook — common objections, discount authority, escalation triggers. The agent follows your rules and can warm-transfer to a human at any point.

Is there a free trial?

Yes — the free tier includes 10 calls with no credit card. All paid plans also come with a 7-day money-back guarantee.

Official integration

Add real phone calls to Claude

Callsy is an MCP server for Claude. In 5 minutes, Claude gets 27 tools to create voice agents, place outbound calls, read transcripts, and run multi-step workflows — in 40+ languages.

Start free — no credit card

Listen to the voices Claude will use

50+ voices across 40+ languages — click any to hear a sample.

Why it matters

Claude can read email, write code, and query databases.
Now it can pick up the phone

Before Callsy, any Claude workflow that needed a real phone call went silent — lead follow-ups, booking confirmations, payment reminders. Phone still converts 3–6× higher than email or SMS but no agent could close the loop. Callsy exposes voice as 27 MCP tools Claude calls like any other skill.

Native MCP

No bridges, no shims. Callsy speaks MCP — the protocol Anthropic designed. Claude auto-discovers every tool.

5-minute setup

Paste one URL into your Claude config. Claude starts seeing the tools on the next turn.

27 tools, 5 categories

Agents, contacts, calls, workflows, and runs. Claude can build a cart-recovery workflow from scratch in one turn.

50+ voices · 40+ languages

Studio-quality neural TTS from ElevenLabs, OpenAI, and Deepgram. English, Polish, German, Hindi, Arabic, Portuguese, and more.

EU-hosted, GDPR-compliant

Data stays in AWS EU. Processor DPA accepted automatically under GDPR Article 28.

No foundation-model training

Your transcripts and customer data are never used to train general models. Period.

5-Minute Setup

Get Claude calling in 3 steps

1
Grab your connector URL
Sign up at platform.callsy.ai. Free tier · no credit card. Copy your personal MCP connector URL from the dashboard — it looks like:
```
https://platform.callsy.ai/mcp?api_key=csk_YOUR_API_KEY
```
2
Add it to Claude
In Claude.ai (Free or Pro), four clicks:
1. Open Settings → Connectors
2. Click “Add custom connector” at the bottom
3. Paste the URL you copied in Step 1
4. Click Add to finish
Using Claude Code instead? One command:
```
claude mcp add callsy https://platform.callsy.ai/mcp?api_key=csk_YOUR_API_KEY
```
3
Tell Claude what to do
Plain English. Claude discovers all 27 tools automatically:
```
Call Sarah (+1-555-0142) about her abandoned cart.
She left running shoes and a water bottle worth $142.
Offer free shipping if she completes the order today.
Use a warm, friendly US English voice.
```
Claude will call create_agent → make_call → get_call in a single turn, and report back with the transcript and outcome.

What Claude can do

Real examples, one turn each

Abandoned cart recovery

“Find all contacts tagged cart_abandoned from the last 48 hours and call them. Offer 10% off for 7 days.”

Meeting booking

“Call John at Acme about our Q3 proposal. Book any 30-min slot next Tuesday afternoon.”

Lead qualification

“Call the 12 leads who downloaded our whitepaper yesterday. Qualify budget, authority, need, and timeline.”

Appointment reminder

“Reminder calls for every appointment tomorrow. If they can't make it, offer the next available slot.”

Payment follow-up

“Call accounts whose card charge failed this morning. Be polite, offer to update payment info over the phone.”

Multilingual outreach

“Call this list of contacts, but detect each contact's preferred language and use the matching voice.”

Frequently asked

How do I connect Callsy to Claude?

In Claude.ai (Free or Pro): go to Settings → Connectors → Add custom connector, paste your Callsy connector URL from platform.callsy.ai, and click Add. Four clicks, no config file. For Claude Code, run `claude mcp add callsy <your-connector-url>`.

Which Claude surfaces support Callsy?

All of them — Claude Desktop, Claude Code (CLI), and the Claude API with MCP support. Anywhere Claude can call an MCP tool, it can call Callsy.

Is there a free tier?

Yes. The free tier includes 10 calls per month with no credit card required. Paid plans start at €15/month with 70% off for early bird customers.

Does Claude's training data include my call transcripts?

No. Callsy does not use Merchant or End-User call data to train any foundation model. See our Privacy Policy for details.

What happens during a call?

When Claude invokes make_call, Callsy places a real outbound call via our telephony infrastructure (Twilio), runs the agent (your configured voice + script), transcribes live with Deepgram, and returns the transcript, outcome, and sentiment to Claude.

Give Claude a voice

Free tier · 10 calls · no credit card · 5-minute setup.

Start with Claude