[eric] reddit mcp electron npm build fix

backend/apps/tools_lib/tools_lib.py

@@ -402,11 +402,25 @@ def derive_mcp_config(tool: ToolDefinition) -> Optional[dict]:
 
     if config.get("type") == "stdio":
         if config.get("command"):
-            resolved = _resolve_command(config["command"])
-            if resolved:
-                config["command"] = resolved
-            else:
-                logger.warning(f"Command '{config['command']}' not found on PATH or bundled directories")
+            # Check for bundled npm MCP servers — use Electron's Node.js instead of npx
+            if config["command"] in ("npx", "bunx"):
+                pkg_name = next((a for a in (config.get("args") or []) if not a.startswith("-")), None)
+                if pkg_name:
+                    _backend = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+                    bundle_path = os.path.join(_backend, "mcp-bundles", f"{pkg_name}.js")
+                    electron_path = os.environ.get("OPENSWARM_ELECTRON_PATH")
+                    if os.path.isfile(bundle_path) and electron_path:
+                        config["command"] = electron_path
+                        config["args"] = [bundle_path]
+                        config.setdefault("env", {})["ELECTRON_RUN_AS_NODE"] = "1"
+                        logger.info(f"Using bundled MCP server for {pkg_name}")
+
+            if not os.path.isabs(config.get("command", "")):
+                resolved = _resolve_command(config["command"])
+                if resolved:
+                    config["command"] = resolved
+                else:
+                    logger.warning(f"Command '{config['command']}' not found on PATH or bundled directories")
         env = config.setdefault("env", {})
         env.setdefault("PATH", _augmented_path())
         env.setdefault("PYTHONPATH", "")

scripts/build-app.sh

@@ -66,6 +66,22 @@ else
 fi
 echo ""
 
+# Step 0b: Bundle npm MCP servers (uses Electron's Node at runtime)
+MCP_BUNDLE_DIR="$PROJECT_ROOT/backend/mcp-bundles"
+mkdir -p "$MCP_BUNDLE_DIR"
+if [[ ! -f "$MCP_BUNDLE_DIR/reddit-mcp-buddy.js" ]]; then
+    echo "[0b] Bundling npm MCP servers..."
+    TMPDIR_MCP=$(mktemp -d)
+    cd "$TMPDIR_MCP"
+    npm install reddit-mcp-buddy --silent 2>/dev/null
+    npx esbuild node_modules/reddit-mcp-buddy/dist/index.js --bundle --platform=node --format=cjs --outfile="$MCP_BUNDLE_DIR/reddit-mcp-buddy.js" 2>/dev/null
+    rm -rf "$TMPDIR_MCP"
+    echo "npm MCP servers bundled."
+else
+    echo "[0b] npm MCP bundles already present."
+fi
+echo ""
+
 # Step 1: Build frontend
 echo "[1/4] Building frontend..."
 cd "$PROJECT_ROOT/frontend"