fix: enhance stdio wrapper for Docker clean JSON-RPC output

- Set environment variables BEFORE imports in stdio-wrapper
- Override ALL console methods to prevent any output
- Update docker-entrypoint.sh to use exec for proper signal handling
- Add fallback if stdio-wrapper.js is missing
- Remove background process handling in stdio mode

This ensures absolutely no log output corrupts the JSON-RPC stream

Dockerfile.test

@@ -0,0 +1,24 @@
+# Quick test Dockerfile using pre-built files
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Copy only the essentials
+COPY package*.json ./
+COPY dist ./dist
+COPY data ./data
+COPY docker/docker-entrypoint.sh /usr/local/bin/
+COPY .env.example ./
+
+# Install only runtime dependencies
+RUN npm install --production @modelcontextprotocol/sdk better-sqlite3 express dotenv
+
+# Make entrypoint executable
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
+
+# Set environment
+ENV IS_DOCKER=true
+ENV MCP_MODE=stdio
+
+ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
+CMD ["node", "dist/mcp/index.js"]

docker/docker-entrypoint.sh

@@ -44,10 +44,21 @@ fi
 
 # Execute the main command in background
 # In stdio mode, use the wrapper for clean output
-if [ "$MCP_MODE" = "stdio" ] && [ -f "/app/dist/mcp/stdio-wrapper.js" ]; then
-    node /app/dist/mcp/stdio-wrapper.js &
+if [ "$MCP_MODE" = "stdio" ]; then
+    # Debug: Log to stderr to check if wrapper exists
+    if [ "$DEBUG_DOCKER" = "true" ]; then
+        echo "MCP_MODE is stdio, checking for wrapper..." >&2
+        ls -la /app/dist/mcp/stdio-wrapper.js >&2 || echo "Wrapper not found!" >&2
+    fi
+    
+    if [ -f "/app/dist/mcp/stdio-wrapper.js" ]; then
+        # Use the stdio wrapper for clean JSON-RPC output
+        exec node /app/dist/mcp/stdio-wrapper.js
+    else
+        # Fallback: run with explicit environment
+        exec env MCP_MODE=stdio DISABLE_CONSOLE_OUTPUT=true LOG_LEVEL=error node /app/dist/mcp/index.js
+    fi
 else
-    "$@" &
-fi
-PID=$!
-wait $PID
+    # HTTP mode or other
+    exec "$@"
+fi

src/mcp/stdio-wrapper.ts

@@ -5,26 +5,41 @@
  * Ensures clean JSON-RPC communication by suppressing all non-JSON output
  */
 
+// CRITICAL: Set environment BEFORE any imports to prevent any initialization logs
+process.env.MCP_MODE = 'stdio';
+process.env.DISABLE_CONSOLE_OUTPUT = 'true';
+process.env.LOG_LEVEL = 'error';
+
 // Suppress all console output before anything else
 const originalConsoleLog = console.log;
 const originalConsoleError = console.error;
 const originalConsoleWarn = console.warn;
 const originalConsoleInfo = console.info;
 const originalConsoleDebug = console.debug;
+const originalConsoleTrace = console.trace;
+const originalConsoleDir = console.dir;
+const originalConsoleTime = console.time;
+const originalConsoleTimeEnd = console.timeEnd;
 
-// Override all console methods
+// Override ALL console methods to prevent any output
 console.log = () => {};
 console.error = () => {};
 console.warn = () => {};
 console.info = () => {};
 console.debug = () => {};
+console.trace = () => {};
+console.dir = () => {};
+console.time = () => {};
+console.timeEnd = () => {};
+console.timeLog = () => {};
+console.group = () => {};
+console.groupEnd = () => {};
+console.table = () => {};
+console.clear = () => {};
+console.count = () => {};
+console.countReset = () => {};
 
-// Set environment to ensure logger suppression
-process.env.MCP_MODE = 'stdio';
-process.env.DISABLE_CONSOLE_OUTPUT = 'true';
-process.env.LOG_LEVEL = 'error';
-
-// Import and run the server
+// Import and run the server AFTER suppressing output
 import { N8NDocumentationMCPServer } from './server-update';
 
 async function main() {