Skip to content
Mockd
Mockd
Start free
Language
The gatewaySoon

Put Mockd in front of your real MCP server.

The gateway puts Mockd in the path of your real server: every call recorded, latency and errors on demand, a full trace to replay, and the destructive ones held back. It's what we're building next. The faithful mocks it's built on are live today.

Start with a live mockor bring your own server
Your agentMockdYour MCP server
deals.create · 196ms · recorded
Faithful mocks & tracesLive
In front of your real serverSoon
How the gateway works

Mockd sits between your agent and your server

Your agent
Your MCP server
→ initialize
← serverInfo · capabilities
handshake ok
initialize

Handshake, passed through

Mockd forwards the handshake and returns your server's real capabilities, so your agent sees exactly the server it would in production.

ƒsearch_contacts
ƒcreate_deal
ƒadd_note
+11 more · 14 tools
tools/list

Your tools, discovered

Mockd asks your server for its tools and renders their names, descriptions and schemas. Nothing is hard-coded.

deals.create196ms
{ amount: 4200 }
inject · 429
tools/call

Forwarded, recorded, tunable

Each call is logged, optionally delayed or turned into a 429 / timeout / empty result, then forwarded on. The response and its latency are captured on the way back.

One catch: reachability

How Mockd reaches your server

Mockd
HTTPS
your-server
Remote / HTTP

If your server is reachable over HTTP, Mockd connects straight to the URL. Nothing to install.

Mockd
tunnel
connectorstdio
Local / stdio

If it runs on your machine behind a firewall, a small local connector tunnels out to Mockd without opening inbound ports.

One endpoint, both modes

Mock first. Real when you're ready. Same endpoint, one flip.

Test against a faithful mock, then point the exact same endpoint at the real server. Same URL, same trace, nothing to re-wire in your agent. Flip the write-protection switch on when you go live.

See the same trace, mock and real
mock.mock-d.com/hubspot/mcp
  1. MockLive

    Synthetic answers, no real data

  2. ShadowSoon

    Watch real calls, no writes

  3. ReviewSoon

    Run-checks: right tool? A before B?

  4. EnforceSoon

    Rules apply, destructive tools blocked

  5. LiveSoon

    Real tools open, fully observed

Mock and observability are live today. The live path (Shadow → Live) is rolling out. Dates are on the roadmap.

Bring your own MCPSoon

Already built your own MCP server? Point Mockd at it.

Every call proxied, captured, replayable.

Connect a custom server
terminal

$ mockd connect https://tools.acme.internal/mcp \

--name acme-internal \

--capture all

✓ connected · 14 tools discovered

✓ trace endpoint ready → mock.mock-d.com/byo/8f2c/mcp

watching for tool calls▋

Put a real server behind Mockd

That's on the roadmap. Today, point your agent at a faithful mock and watch every call land.

Start with a live mock