Build a mocked
MCP-Servers in seconds
Create really working Mock servers for your development and test infrastructure. Including live debug view showing how your AI Agent called your tools.
Trusted by enterprises and SMEs
Describe the tool — get a running mock server
Paste an example response, and MCP-Builder.ai generates a real, callable MCP tool and starts a hosted mock server for it.
{
"orders": [
{
"id": "ord_10231",
"status": "shipped",
"total": 149.9,
"currency": "EUR",
"customer": { "id": "cus_88", "email": "jane@acme.io" },
"line_items": [
{ "sku": "TS-BLK-M", "qty": 2, "price": 39.95 },
{ "sku": "MUG-01", "qty": 1, "price": 12.0 }
]
}
]
}Debug your MCP-Server in Real-Time
A live view of incoming MCP tool calls with the exact tool-input your AI agent sent — so you can see what the model really did, not what you hoped it would do.
tool-input { "status": "shipped", "limit": 10 }Mock servers for your development and test infrastructure
Build against tools that do not exist yet, keep tests deterministic and stop waiting for a backend team to be ready.
Mocks generated in seconds
Describe a tool or paste an example response — name, description, input schema and workflow are generated for you.
Really working MCP servers
Not a static fixture: a callable MCP-Streamable endpoint your AI client, tests and CI can talk to right away.
Fully hosted
A stable mock URL per environment, no infrastructure, no containers and no local setup on your side.
Live request tracing
Every incoming tool call with its exact tool-input, latency and result — perfect for debugging agent behaviour.
How it works
Your AI agent talks to a hosted mock MCP server. Every tool call is matched against your mock rules and answered with realistic data — instantly, and fully traced.
Claude, ChatGPT, Copilot, Cursor, n8n — any MCP client.
Hosted, callable MCP endpoint with live request tracing.
Schemas, example payloads, status codes and edge cases you define.
MCP-Server Mock FAQ
Everything about mocking MCP servers for development and testing
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