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.

Native MCP skill

Give OpenClaw agents a voice

OpenClaw agents run autonomously. Now they can place real phone calls as part of their loop — no human in the middle, no custom wiring, no telephony knowledge required.

Start free — no credit card

Listen to the voices your agents can use

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

Why OpenClaw + Callsy

Autonomous agents need real-world reach
Phone is the last mile

OpenClaw agents browse, execute, and act — but most real workflows hit a wall the moment they need a phone call. Callsy is the skill that closes the loop: the agent reasons about what to say, Callsy dials, talks, and reports back the outcome as structured data.

Pure MCP — no bridges

Callsy speaks the same protocol OpenClaw speaks. Zero translation layer, zero latency overhead.

Guardrails the AI can't override

Set max_discount, escalate_on, time_windows at agent creation. Autonomous, but controlled.

Structured outcomes

Every call returns a typed result — converted / booked / no_answer / escalated. Your agent can branch on it.

Conversation as a sub-process

make_call returns immediately. The agent keeps reasoning; Callsy streams results when the call ends.

Autonomous loops

Set the goal · Walk away

24/7 outbound sales rep

“Every lead that scores above 80, call immediately. If no answer, retry in 2 hours. If booked, notify the team on Slack.”

Renewal operator

“Monitor Stripe for subscription renewals in the next 30 days. Call at-risk customers with the loyalty offer. Report outcomes daily.”

Support triage

“Any ticket flagged urgent → call the customer within 10 minutes. Resolve what you can; escalate to a human if needed.”

Market researcher

“Here are 200 prospects. Call each in their language, ask our 5 research questions, tag outcomes, produce a report.”

Frequently asked

How do I add Callsy to OpenClaw?

Register Callsy's MCP server as a skill in your OpenClaw agent config: point at https://mcp.callsy.ai/sse with your API key. All 27 tools become available to the agent on the next loop iteration.

Do my autonomous agents need supervision for calls?

Callsy supports agent-configured guardrails — max discount, escalation triggers, time-of-day limits, call caps. Set them once when you create the agent; the AI cannot override them at runtime.

Can OpenClaw agents handle inbound calls too?

Yes. Create an inbound-ready agent with create_agent, point a Callsy number at it, and inbound calls get routed to your agent with full conversational state.

What happens when a call needs a human?

Define escalation rules per agent. The AI can warm-transfer mid-call to a human number, open a support ticket, or end the call with a note — whichever you wire in.

Is there a free tier?

Yes — 10 calls per month, no credit card required. Paid plans start at €15/month.

Autonomous agents that call

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

Start with OpenClaw