Guides·27 July 2026·6 min read

How to add a code-review gate to Claude Code with an MCP server

Claude Code, Cursor and Windsurf all ship with the same architectural gap: the model that writes the code is the only thing checking the code. The fix is a validation gate the assistant must call — wired in through the Model Context Protocol (MCP), which all three clients support natively. This guide walks through the setup end to end. Total time: about five minutes.

1. Get a token

Create a Verificate account — the 30-day trial needs no card — and copy the MCP token from your dashboard. The token authenticates your client to the gateway; access simply stops at trial end unless you subscribe (US$30/month after that).

2. Add the server to your client

For Claude Code, one command:

terminal

claude mcp add --transport http verificate \
  "https://<gateway>/mcp" \
  --header "Authorization: Bearer <YOUR_TRIAL_TOKEN>"

Or drop the equivalent JSON into your client's MCP config — the same block works in Cursor (~/.cursor/mcp.json) and Windsurf (~/.codeium/windsurf/mcp_config.json):

mcp config — identical across clients

{
  "mcpServers": {
    "verificate": {
      "url": "https://<gateway>/mcp",
      "transport": "http",
      "headers": { "Authorization": "Bearer <YOUR_TRIAL_TOKEN>" }
    }
  }
}

The exact gateway URL is shown with a copy button on the MCP page and in your dashboard.

3. Know the four tools you just added

validate_ai_output — the main gate. Deterministic reality checks first (any one can veto), then an enterprise-grade review to ISO/IEC 25010 scores what survives.
analyze_code — the deep-review pass on demand: performance, scalability, reliability, tech debt.
validate_plan — review the approach before any code is written; the cheapest place to catch a bad design.
generate_code — generation that goes through the same gates on the way out.

4. Make gating the default, not a favour

Tools the assistant may call are tools it will skip under pressure. Add a standing instruction to your project (for Claude Code, CLAUDE.md; for Cursor, a rule file) along these lines:

CLAUDE.md / project rules

Before presenting any substantive code change as complete:
1. Call validate_ai_output on the change.
2. If the verdict is REJECTED, fix the findings and re-validate.
3. Never claim tests pass or systems are deployed without proof.

The first time the gate vetoes something, read the findings rather than overriding them. A verdict like “N+1 synchronous calls — 100 items ≈ 100 roundtrips, ~10–20 s, blocks the worker thread” is the review a senior engineer would have given you — it arrived in seconds instead of at the next incident.

5. Verify it's working

Ask your assistant to “validate this function with verificate” on any nontrivial snippet. You should see a tool call go out and a structured verdict come back — severity-ranked findings and a score, or a veto with the reason. If the tool doesn't appear, restart the client (MCP servers are loaded at startup) and check the token.

Where this leaves you

Your assistant still writes at AI speed — but nothing it writes reaches you unchecked. Plans get reviewed before code exists, code gets gated before it's claimed done, and completion claims must be provable. That is the difference between delivery and quality delivery.

FAQ

Does an MCP validation server slow the assistant down?

Each validation call takes seconds and happens inside the assistant's loop, before work is presented. Compare that with the alternative: a defect discovered in CI or production, plus the context-switch to fix it. In practice gating is net-faster for any change that matters.

Do I need different setups for Claude Code, Cursor and Windsurf?

No. MCP is a shared protocol; the same server URL and token work in all three, plus any other MCP-capable client. Only the location of the config file differs per client.

Can the gate block the assistant from claiming work is finished?

Yes — that's the point. Deterministic gates (mock/placeholder detection, completion claims, reality validation) each have veto power. A standing instruction tells the assistant to validate before declaring completion, so a REJECTED verdict sends it back to fix findings instead of presenting broken work.

Put a real gate on your AI output.

Verificate MCP runs deterministic reality gates plus an enterprise-grade review on every AI output — in Claude Code, Cursor, Windsurf or any MCP client. 30-day free trial, no card required.

Start 30-day free trial See how the gate works