THE ULTIMATE CRITIC

Model Context Protocol

Call TUC from your agent.

Connect by URL or run one local stdio file. The agent can check generated work, read the verdict, and decide whether to repair, collect evidence, or continue.

Connect the remote serverOfficial MCP RegistryDownload the local server
01

The builder finishes

The agent packages the work with its task, requirements, constraints, and evidence.

02

The agent calls TUC

tuc.evaluate sends the package through the configured tenant account.

03

The workflow branches

The returned verdict is pass, fail, or insufficient_evidence.

Connect

One URL. No local server.

Install io.github.marksignals/the-ultimate-critic from the official MCP Registry, or point a Streamable HTTP client directly at the live endpoint. Omit the header to use tuc.preview. For paid tools, store the tenant key through the secret or header setting provided by your client.

{
  "mcpServers": {
    "tuc": {
      "type": "streamable-http",
      "url": "https://ultimate-critic.fly.dev/mcp",
      "headers": {
        "X-API-Key": "YOUR_TENANT_KEY"
      }
    }
  }
}

The remote endpoint is stateless. The key is accepted only as the secret X-API-Key header; it is never a tool argument or returned in a result.

Prefer a local process?

The standalone bridge requires Python 3.10 or later and no package install. Paid tools read TUC_API_KEY from the process environment.

curl -fsSLO https://ultimate-critic.fly.dev/tuc-mcp-server.py
{
  "mcpServers": {
    "tuc": {
      "command": "python",
      "args": ["C:/absolute/path/tuc-mcp-server.py"]
    }
  }
}

Use the preview only with sanitized, non-sensitive work. Paid submissions follow the service and privacy terms for your account.

Tools

Four operations, with clear costs.

tuc.preview

No key

Checks one sanitized text, code, or JSON artifact with the deterministic no-retention preview. Does not consume the paid entitlement.

tuc.quote

Tenant key · no charge

Returns the package tier and credit cost before you submit it. The artifact is not evaluated or stored.

tuc.evaluate

Tenant key · 1, 5, or 10 credits

Checks a complete supported artifact request and reports the charged tier in the response.

tuc.usage

Tenant key · no charge

Reads review-credit usage and remaining access without submitting an artifact.

Credit tiers: standard is up to 256 KiB, 8 files, and no images (1 credit); extended is up to 2 MiB, 16 files, and 3 images (5 credits); full is up to 8 MiB, 32 files, and 8 images (10 credits). Limits apply to the encoded request package.

Agent contract

Do not collapse the verdicts.

A useful pipeline handles each result explicitly. A missing-evidence result is not a pass, and a failed result should carry the supported findings into the repair step.

pass

Continue only if the result also satisfies your own release policy.

fail

Send the findings and verification steps to the next repair stage.

insufficient_evidence

Collect the requested proof and submit the package again.

Founding access

Connect one real pipeline.

$249 once includes one tenant key, 90 days, 1,000 review credits, and up to two hours of first-integration support. Use tuc.quote to see whether a package costs 1, 5, or 10 credits before submitting it.

Get founding access — $249Check fit first