Activity

Problem

When creating an application via the MCP, validation errors from the Coolify API return only "Validation failed." without details about which fields failed validation or why.

Example

mcp__coolify__application action=create_key ...
Error: Validation failed.

This makes it difficult to debug what's actually wrong with the request.

Investigation

Looking at coolify-client.ts, error handling extracts error.message from the API response:

if (!response.ok) {
  const error = data as ErrorResponse;
  throw new Error(error.message || `HTTP ${response.status}: ${response.statusText}`);
}

The issue is that Coolify's API likely returns validation errors in a different format (possibly error.errors or similar) that isn't being captured.

Suggestions

1. Improve error handling

Capture and return full validation error details:

if (!response.ok) {
  const error = data as ErrorResponse;
  const errorDetails = error.errors 
    ? JSON.stringify(error.errors) 
    : error.message;
  throw new Error(errorDetails || `HTTP ${response.status}: ${response.statusText}`);
}

2. Add Docker image deployment tool

The client has createApplicationDockerImage but it's not exposed as a tool. This would be useful for deploying pre-built images from Docker Hub:

// In mcp-server.ts application tool
case 'create_dockerimage':
  // Deploy from Docker Hub image like stumason/polar-flow-server:latest
  return this.client.createApplicationDockerImage(args);

Context

Was trying to deploy stumason/polar-flow-server:latest to Coolify and kept getting unhelpful validation errors.