Mockd Simulate
Safe versions of the systems your agent works in. Start with HubSpot today. Each mock mirrors the real server's tools, descriptions and schemas, just with synthetic data.
{
"mcpServers": {
"hubspot": {
"url": "mock.mock-d.com/hubspot/mcp",
"headers": { "x-mockd-key": "mk_test_8f2c…" }
}
}
}A safe version of the real world
Mockd gives your agent realistic copies of the systems it will work in, copies that remember what it just did. The tools and the behaviour are the same, the risk is not. And four moves you can't make against a real account: run, break, diff, replay.
A sandbox that remembers
Create something, read it back, it's there, and it stays there the whole run long. Your agent behaves the way it would against the real system.
| id | dealname | amount |
|---|---|---|
| 4821 | Acme Q3 Expansion | 48 000 |
- written by
- crm.deals.create
- read back by
- crm.deals.get
Failure rules you set up front
Rate limits, timeouts, empty answers. You decide what goes wrong and when, so how your agent copes stops being a guess.
Two runs, side by side
Change something, run it again, and read step by step where the two runs part ways.
- search
- get
- create
- associate
- note
- search
- get
- create
- note
diverges at step 4
The same run, once more
A finished run restarts exactly as it was, with the same state and the same failure rules. The bug reproduces instead of hiding.
A growing library of ready-made mocks
One entry per system, each one a full MCP server with the real tools, descriptions and schemas behind it. HubSpot is live today, and what comes next is set by what people ask for.