Add stdio transport support to client integration test runner

.github/workflows/client-integration-tests.yml

@@ -26,17 +26,19 @@ permissions:
 
 jobs:
   integration-tests:
-    name: Integration Tests (${{ matrix.os }})
+    name: Integration Tests (${{ matrix.os }}, ${{ matrix.mcp-mode }})
     runs-on: ${{ matrix.os }}
 
     strategy:
       fail-fast: false
       matrix:
+        mcp-mode: [http, stdio]
         os: [ubuntu-latest, windows-latest]
 
     env:
       HTTP_HOST: 'localhost'
       HTTP_PORT: '3000'
+      MCP_MODE: ${{ matrix.mcp-mode }}
       TIMEOUT_SECONDS: '30'
       URL_SCHEME: 'http'
 
@@ -110,7 +112,7 @@ jobs:
         run: npm run test:integration --workspace=client
 
       - name: MCP Integration Tests - Stop the background MCP server process
-        if: always()
+        if: always() && matrix.mcp-mode == 'http'
         shell: bash
         run: |
           if [ -f server.pid ]; then
@@ -141,8 +143,8 @@ jobs:
       - name: MCP Integration Tests - Summary
         shell: bash
         run: |
-          echo "## Integration Tests Summary (${{ matrix.os }})" >> $GITHUB_STEP_SUMMARY
-          echo "✅ MCP server integration tests passed on ${{ matrix.os }}" >> $GITHUB_STEP_SUMMARY
+          echo "## Integration Tests Summary (${{ matrix.os }}, ${{ matrix.mcp-mode }})" >> $GITHUB_STEP_SUMMARY
+          echo "✅ MCP server integration tests passed on ${{ matrix.os }} with ${{ matrix.mcp-mode }} transport" >> $GITHUB_STEP_SUMMARY
 
   codeql-path-tests:
     name: CODEQL_PATH Tests (${{ matrix.os }})

.gitignore

@@ -49,6 +49,9 @@ codeql-development-mcp-server.code-workspace
 # Prevent accidentally committing integration test output files in root directory
 # These should only be in client/integration-tests/primitives/tools/*/after/ directories
 /evaluator-log.json
+/client/query-results/
+/client/query-results.bqrs
+/client/query-results.sarif
 /query-results/
 /query-results.bqrs
 /query-results.sarif

client/package.json

@@ -55,8 +55,10 @@
     "test:coverage": "echo 'NOOP client test:coverage'",
     "test:integration": "scripts/run-integration-tests.sh --no-install-packs",
     "test:integration:default": "ENABLE_MONITORING_TOOLS=false scripts/run-integration-tests.sh --no-install-packs",
+    "test:integration:http": "MCP_MODE=http scripts/run-integration-tests.sh --no-install-packs",
     "test:integration:install-packs": "scripts/run-integration-tests.sh",
-    "test:integration:monitoring": "ENABLE_MONITORING_TOOLS=true scripts/run-integration-tests.sh",
+    "test:integration:monitoring": "ENABLE_MONITORING_TOOLS=true scripts/run-integration-tests.sh --no-install-packs",
+    "test:integration:stdio": "MCP_MODE=stdio scripts/run-integration-tests.sh --no-install-packs",
     "tidy": "npm run lint && npm run format"
   }
 }

client/scripts/run-integration-tests.sh

@@ -8,8 +8,9 @@
 #   2. Monitoring mode (monitoring tools enabled) - tests session_* tools
 #
 # Environment Variables:
-#   HTTP_HOST              - Server host (default: localhost)
-#   HTTP_PORT              - Server port (default: 3000)
+#   MCP_MODE               - MCP transport mode (default: stdio, also: http)
+#   HTTP_HOST              - Server host for HTTP mode (default: localhost)
+#   HTTP_PORT              - Server port for HTTP mode (default: 3000)
 #   TIMEOUT_SECONDS        - Request timeout (default: 30)
 #   ENABLE_MONITORING_TOOLS - Force a specific mode instead of running both:
 #                            "true"  = only run with monitoring tools enabled
@@ -20,6 +21,7 @@
 #   ./run-integration-tests.sh                    # Run in BOTH modes (recommended)
 #   ENABLE_MONITORING_TOOLS=false ./run-integration-tests.sh  # Only default mode
 #   ENABLE_MONITORING_TOOLS=true ./run-integration-tests.sh   # Only monitoring mode
+#   MCP_MODE=http ./run-integration-tests.sh      # Run using HTTP transport
 #   ./run-integration-tests.sh --tools session_end            # Filter to specific tools
 
 set -e
@@ -29,6 +31,7 @@ CLIENT_DIR="$(dirname "$SCRIPT_DIR")"
 SERVER_DIR="$(dirname "$CLIENT_DIR")/server"
 
 # Set default environment variables
+export MCP_MODE="${MCP_MODE:-stdio}"
 export HTTP_HOST="${HTTP_HOST:-localhost}"
 export HTTP_PORT="${HTTP_PORT:-3000}"
 export TIMEOUT_SECONDS="${TIMEOUT_SECONDS:-30}"
@@ -65,7 +68,10 @@ for arg in "$@"; do
 done
 
 echo "🚀 Starting CodeQL MCP Integration Tests"
-echo "Server URL: $URL_SCHEME://$HTTP_HOST:$HTTP_PORT/mcp"
+echo "MCP Mode: $MCP_MODE"
+if [ "$MCP_MODE" = "http" ]; then
+    echo "Server URL: $URL_SCHEME://$HTTP_HOST:$HTTP_PORT/mcp"
+fi
 
 # Step 1: Build and bundle the server code
 echo "📦 Building CodeQL MCP server bundle..."
@@ -81,43 +87,56 @@ else
 fi
 
 cd "$CLIENT_DIR"
-export MCP_MODE=http
-export MCP_SERVER_URL="$URL_SCHEME://$HTTP_HOST:$HTTP_PORT/mcp"
+
+# For HTTP mode, set the server URL for the client
+if [ "$MCP_MODE" = "http" ]; then
+    export MCP_SERVER_URL="$URL_SCHEME://$HTTP_HOST:$HTTP_PORT/mcp"
+fi
 
 # Function to run tests in a specific mode
 run_tests_in_mode() {
     local mode_name="$1"
     local enable_monitoring="$2"
-
+    shift 2
+
     echo ""
     echo "═══════════════════════════════════════════════════════════════"
     echo "🧪 Running integration tests: $mode_name"
     echo "═══════════════════════════════════════════════════════════════"
-    
+
     # Set the monitoring tools flag for this run
     export ENABLE_MONITORING_TOOLS="$enable_monitoring"
-
-    # Start MCP server with current settings
-    echo "🚀 Starting MCP server (monitoring=$enable_monitoring)..."
-    "$SCRIPT_DIR/start-server.sh"
-
-    # Wait for server startup
-    echo "⏳ Waiting for server startup..."
-    "$SCRIPT_DIR/wait-for-server.sh"
-
+
+    if [ "$MCP_MODE" = "http" ]; then
+        # HTTP mode: start server in background, run tests, stop server
+        echo "🚀 Starting MCP server (monitoring=$enable_monitoring)..."
+        "$SCRIPT_DIR/start-server.sh"
+
+        # Wait for server startup
+        echo "⏳ Waiting for server startup..."
+        "$SCRIPT_DIR/wait-for-server.sh"
+    else
+        # stdio mode: client spawns server directly via StdioClientTransport
+        echo "📡 Using stdio transport (client spawns server directly)"
+    fi
+
     # Run the integration tests (skip pack installation since we already did it)
     echo "🧪 Running tests..."
     node src/ql-mcp-client.js integration-tests --no-install-packs "$@"
-
-    # Stop the server before next mode
-    echo "🛑 Stopping server..."
-    "$SCRIPT_DIR/stop-server.sh"
+
+    if [ "$MCP_MODE" = "http" ]; then
+        # Stop the server before next mode
+        echo "🛑 Stopping server..."
+        "$SCRIPT_DIR/stop-server.sh"
+    fi
 }
 
 # Trap to ensure cleanup happens even if script fails
 cleanup() {
     echo "🧹 Cleaning up..."
-    "$SCRIPT_DIR/stop-server.sh" 2>/dev/null || true
+    if [ "$MCP_MODE" = "http" ]; then
+        "$SCRIPT_DIR/stop-server.sh" 2>/dev/null || true
+    fi
 }
 trap cleanup EXIT
 

client/src/lib/cli-parser.js

@@ -133,6 +133,12 @@ OPTIONS:
                        Example: --timeout 600
 
   --help               Display help information
+
+ENVIRONMENT VARIABLES:
+  MCP_MODE             MCP transport mode: stdio (default) or http
+  MCP_SERVER_PATH      Path to the MCP server JS entry point (stdio mode only)
+  MCP_SERVER_URL       MCP server URL (http mode only, default: http://localhost:3000/mcp)
+  ENABLE_MONITORING_TOOLS  Enable session_* monitoring tools (default: false)
 `;
 }