Mimiq - Synthetic User Testing

Mimiq MCP Server

Your agent built the page. Simulated buyers test it.

Mimiq shows a page, copy or email to a crowd of simulated people and reports how they reacted and why: who would stay, who would leave, what confused them and what would change their mind. Give it two versions and it makes a call on which one to ship.

Flows go further: each simulated person opens your live site in a real browser and tries a task, such as signing up or reaching checkout. They click, type and fill in your forms, with an inbox of their own for verification codes, and the report shows how far each one got, where they stopped and why.

Tools

Tool	What it does
mimiq.compare_copy	Two versions of copy or an email, the same simulated people, and Mimiq's call on which to ship. One free A/B without a key (up to 10 people per version).
mimiq.compare_urls	Two pages (for example a preview deployment and production), the same simulated people, and Mimiq's call. One free A/B without a key (up to 10 people per version).
mimiq.test_page	One page: each person scrolls it and says what confused them, what they doubted and what would help.
mimiq.test_flow	A signup, onboarding or checkout flow in a real browser, step by step, to find where people give up. Several credits a person (current price).
mimiq.test_copy	One piece of copy (headline, tagline, subject line, call to action). With variant_b it runs compare_copy.
mimiq.test_text	Any other text (positioning, feature descriptions, error messages, instructions). Pass goal.
mimiq.test_component	A UI component from its HTML or a description: do people understand it, trust it, use it?
mimiq.ask_audience	A multiple-choice question, answered by each person with their reasoning.

Ask your agent directly, or let it test what it just built:

"Test my landing page on startup founders"

"Have three people try to sign up on my staging site and tell me where they get stuck"

"Which headline should we ship? Compare them on freelance designers"

"Compare the preview deployment with production"

Mimiq's call on two versions

In compare_copy and compare_urls, the same people see version A and version B. Mimiq's call combines two things:

• a forecast of how people like them behave, asked in both orders so the order cannot decide it;
• how the same people moved between the versions.

The call is clear (the forecast and the people agree), leaning (the forecast picks a version and the people did not agree), or too close to call (the forecast changed with the order; no pick). The words come from the same code as the Mimiq app, so the result never says more than the report it links to.

What you get back:

• call: the headline ("Version B is the better bet."), the tier, the pick, the reason in one or two sentences, and how the people bear on it.
• movers: how many of the same people warmed to B, cooled on B, or stayed about the same, and how often chance splits them that unevenly.
• versions.a and versions.b: each version's headline, counts and top objections.
• report_url: the comparison in the Mimiq app (with a key). The plain-text summary always ends with it.

Use at least 5 people per comparison: from 5 up, Mimiq reads who moved; below that it compares rates.

How far to trust it

These are simulated people. Mimiq's forecast has held up on headlines: right on 76% of 1,000 real headline A/B tests, against 61% for the best rule of thumb (the benchmark). In pre-registered tests on emails, text messages and ads it was no better than chance at ranking small wording changes (the register), so treat those calls as a fast first read. A call says which way a difference would go, not how big it would be.

Setup

Claude Code

claude mcp add --transport http mimiq https://mcp.mimiqai.com/mcp --header "Authorization: Bearer $MIMIQ_API_KEY"

Or in .mcp.json at your project root (Claude Code reads ${MIMIQ_API_KEY} from your environment, so the key stays out of the repo):

{
  "mcpServers": {
    "mimiq": {
      "type": "http",
      "url": "https://mcp.mimiqai.com/mcp",
      "headers": { "Authorization": "Bearer ${MIMIQ_API_KEY}" }
    }
  }
}

Leave out the header to use the free try.

Codex

In ~/.codex/config.toml (or .codex/config.toml in your project):

[mcp_servers.mimiq]
url = "https://mcp.mimiqai.com/mcp"
bearer_token_env_var = "MIMIQ_API_KEY"

Cursor

In ~/.cursor/mcp.json or .cursor/mcp.json (do not commit a file with a key in it):

{
  "mcpServers": {
    "mimiq": {
      "url": "https://mcp.mimiqai.com/mcp",
      "headers": { "Authorization": "Bearer mq_sk_..." }
    }
  }
}

VS Code (GitHub Copilot)

In .vscode/mcp.json; VS Code asks for the key once and stores it:

{
  "inputs": [{ "type": "promptString", "id": "mimiq-key", "description": "Mimiq API key", "password": true }],
  "servers": {
    "mimiq": {
      "type": "http",
      "url": "https://mcp.mimiqai.com/mcp",
      "headers": { "Authorization": "Bearer ${input:mimiq-key}" }
    }
  }
}

Windsurf

In ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "mimiq": {
      "serverUrl": "https://mcp.mimiqai.com/mcp",
      "headers": { "Authorization": "Bearer mq_sk_..." }
    }
  }
}

Claude Desktop

Through mcp-remote, in the Claude Desktop config:

{
  "mcpServers": {
    "mimiq": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://mcp.mimiqai.com/mcp", "--header", "Authorization:${MIMIQ_AUTH}"],
      "env": { "MIMIQ_AUTH": "Bearer mq_sk_..." }
    }
  }
}

Keys and the free try

• Without a key, each agent gets one free test: one run on up to 100 simulated people. A comparison shows both versions to the same people, so it needs two runs; without a key an agent also gets one free A/B of up to 10 people per version, while the daily free A/B allowance lasts. Anything larger needs a key, and the tools say so before anything is spent.
• Get a key: create a free account at www.mimiqai.com/sign-up (it includes 50 credits). Open Settings, find "Use Mimiq from your coding agent", and choose "Create a key". The key starts with mq_sk_ and is shown once.
• Send it on every request as Authorization: Bearer mq_sk_... (X-API-Key: mq_sk_... works too). The setup snippets above do this.
• Credits: one credit is one simulated person in one run (a flow uses more a person; see pricing). A comparison of n people uses 2n: n to recruit them, n for version B (version A's run comes with the new people). Buy more at www.mimiqai.com/app/usage; a $9 Starter (120 credits that never expire) or monthly plans from $49.

Report links

With a key, every test and comparison is saved to your account, and the result ends with a link to it in the Mimiq app (/app/t/... for a test, /app/compare/.../... for a comparison). Put the link in your summary so your human can open the full report, the people and their words. Reports are private until you share them from the app.

Without a key, tests stay private to the agent that ran them and cannot be opened in the app; the result says how to get a key instead. ask_audience answers are returned in full and are not saved as a report yet.

What a single test returns

Each simulated person's reaction, not a verdict:

• action and action_class (converted, engaged or bounced): what they did.
• monologue, objections, what_would_help: what they thought, what stopped them, what would change their mind.
• per_100: on copy and page tests, the person's own estimate of how many in 100 people like them would stop or stay, and act.
• journey_steps: on test_page and test_flow, the steps where something changed.
• counts, a plain summary_card, and report_url (with a key).

Localhost

Mimiq needs a public URL. For a local dev server, open a temporary tunnel with cloudflared (free, no account) and pass its URL. The page is public while the tunnel runs, so your agent should tell you before it opens one:

cloudflared tunnel --url http://localhost:3000 > /tmp/mimiq_tunnel.log 2>&1 &
sleep 5; grep -o 'https://[^ |]*trycloudflare.com' /tmp/mimiq_tunnel.log

Errors

Every error carries a code, a plain message and a request_id. Credit and key errors also carry how_to_get_a_key (the steps, the header and the .mcp.json).

Code	What it means	What to do
INSUFFICIENT_CREDITS	reason says which: free_try_used, ab_needs_two_runs, free_try_too_big, network_monthly_limit, or out_of_credits (with a key).	Get a key, run fewer people, or buy more credits.
UNAUTHORIZED	The key was not accepted (invalid_key).	Check it starts with mq_sk_ and is still listed in Settings.
INVALID_INPUT	A missing field, or a URL Mimiq cannot reach (localhost, a private address).	Fix the input; for localhost, use a tunnel.
SIM_FAILED	The run failed, for example the page did not load. A failed run is refunded.	Check the URL loads in a normal browser, then call again.
SIM_TIMEOUT	The run outlasted timeout_seconds. It keeps going on Mimiq's side.	With a key, open the report link later; or call again with a longer timeout.
RATE_LIMITED	Too many calls from one network in a minute.	Wait a minute.

Local package (npm)

This repository also holds the source of @mimiqai/mcp in src/: a small MCP server you run yourself. It starts a local HTTP endpoint, forwards each call with your key to the Mimiq API, and offers six of the tools above (not the two compare tools). For everyday use the hosted endpoint is simpler; the local server is for setups that want the MCP layer on their own machine.

MIMIQ_API_URL=https://api.mimiqai.com/api node src/server.js

Then point your MCP client at http://127.0.0.1:8787/mcp with the header Authorization: Bearer mq_sk_.... PORT, HOST and MIMIQ_MCP_PATH change where it listens.

License

MIT