diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..c92444e
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,38 @@
+name: Smoke Tests
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "18"
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.10"
+
+      - name: Install uv
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+
+      - name: Set up Rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: stable
+
+      - name: Run smoke tests
+        run: ./tests/smoke-test.sh
diff --git a/mcp-client-python/client.py b/mcp-client-python/client.py
index 219f1ae..7a2986c 100644
--- a/mcp-client-python/client.py
+++ b/mcp-client-python/client.py
@@ -1,4 +1,5 @@
 import asyncio
+import os
 from typing import Optional
 from contextlib import AsyncExitStack
 
@@ -19,7 +20,14 @@ def __init__(self):
         # Initialize session and client objects
         self.session: Optional[ClientSession] = None
         self.exit_stack = AsyncExitStack()
-        self.anthropic = Anthropic()
+        self._anthropic: Optional[Anthropic] = None
+
+    @property
+    def anthropic(self) -> Anthropic:
+        """Lazy-initialize Anthropic client when needed"""
+        if self._anthropic is None:
+            self._anthropic = Anthropic(api_key=os.getenv("ANTHROPIC_API_KEY"))
+        return self._anthropic
 
     async def connect_to_server(self, server_script_path: str):
         """Connect to an MCP server
@@ -65,7 +73,7 @@ async def process_query(self, query: str) -> str:
         ]
 
         response = await self.session.list_tools()
-        available_tools = [{ 
+        available_tools = [{
             "name": tool.name,
             "description": tool.description,
             "input_schema": tool.inputSchema
@@ -88,7 +96,7 @@ async def process_query(self, query: str) -> str:
             elif content.type == 'tool_use':
                 tool_name = content.name
                 tool_args = content.input
-                
+
                 # Execute tool call
                 result = await self.session.call_tool(tool_name, tool_args)
                 final_text.append(f"[Calling tool {tool_name} with args {tool_args}]")
@@ -100,7 +108,7 @@ async def process_query(self, query: str) -> str:
                       "content": content.text
                     })
                 messages.append({
-                    "role": "user", 
+                    "role": "user",
                     "content": result.content
                 })
 
@@ -141,10 +149,18 @@ async def main():
     if len(sys.argv) < 2:
         print("Usage: python client.py <path_to_server_script>")
         sys.exit(1)
-        
+
     client = MCPClient()
     try:
         await client.connect_to_server(sys.argv[1])
+
+        # Check if we have a valid API key to continue
+        api_key = os.getenv("ANTHROPIC_API_KEY")
+        if not api_key:
+            print("\nNo ANTHROPIC_API_KEY found. To query these tools with Claude, set your API key:")
+            print("  export ANTHROPIC_API_KEY=your-api-key-here")
+            return
+
         await client.chat_loop()
     finally:
         await client.cleanup()
diff --git a/mcp-client-typescript/index.ts b/mcp-client-typescript/index.ts
index 99a185b..c8305af 100644
--- a/mcp-client-typescript/index.ts
+++ b/mcp-client-typescript/index.ts
@@ -13,25 +13,23 @@ import dotenv from "dotenv";
 dotenv.config(); // load environment variables from .env
 
 const ANTHROPIC_MODEL = "claude-sonnet-4-5";
-const ANTHROPIC_API_KEY = process.env.ANTHROPIC_API_KEY;
-if (!ANTHROPIC_API_KEY) {
-  throw new Error("ANTHROPIC_API_KEY is not set");
-}
 
 class MCPClient {
   private mcp: Client;
-  private anthropic: Anthropic;
+  private _anthropic: Anthropic | null = null;
   private transport: StdioClientTransport | null = null;
   private tools: Tool[] = [];
 
   constructor() {
-    // Initialize Anthropic client and MCP client
-    this.anthropic = new Anthropic({
-      apiKey: ANTHROPIC_API_KEY,
-    });
+    // Initialize MCP client
     this.mcp = new Client({ name: "mcp-client-cli", version: "1.0.0" });
   }
 
+  private get anthropic(): Anthropic {
+    // Lazy-initialize Anthropic client when needed
+    return this._anthropic ??= new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY });
+  }
+
   async connectToServer(serverScriptPath: string) {
     /**
      * Connect to an MCP server
@@ -182,6 +180,17 @@ async function main() {
   const mcpClient = new MCPClient();
   try {
     await mcpClient.connectToServer(process.argv[2]);
+
+    // Check if we have a valid API key to continue
+    const apiKey = process.env.ANTHROPIC_API_KEY;
+    if (!apiKey) {
+      console.log(
+        "\nNo ANTHROPIC_API_KEY found. To query these tools with Claude, set your API key:"
+      );
+      console.log("  export ANTHROPIC_API_KEY=your-api-key-here");
+      return;
+    }
+
     await mcpClient.chatLoop();
   } finally {
     await mcpClient.cleanup();
diff --git a/mcp-client-typescript/package-lock.json b/mcp-client-typescript/package-lock.json
index 69912e6..aaeae46 100644
--- a/mcp-client-typescript/package-lock.json
+++ b/mcp-client-typescript/package-lock.json
@@ -638,6 +638,7 @@
       "resolved": "https://registry.npmjs.org/zod/-/zod-3.24.2.tgz",
       "integrity": "sha512-lY7CDW43ECgW9u1TcT3IoXHflywfVqDYze4waEz812jR/bZ8FHDsl7pFQoSZTz5N+2NqRXs8GBwnAwo3ZNxqhQ==",
       "license": "MIT",
+      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
diff --git a/tests/README.md b/tests/README.md
new file mode 100644
index 0000000..3041509
--- /dev/null
+++ b/tests/README.md
@@ -0,0 +1,115 @@
+# MCP Quickstart Smoke Tests
+
+This directory contains smoke tests for the MCP quickstart examples. These tests verify that all example servers and clients can start and respond correctly, without calling external APIs.
+
+## Overview
+
+The smoke tests verify:
+
+- **Servers**: Each weather server (Python, TypeScript, Rust) can start and respond to MCP protocol requests
+- **Clients**: Each MCP client (Python, TypeScript) can connect to a mock server and list tools
+
+## Running Tests
+
+```bash
+./tests/smoke-test.sh
+```
+
+## Requirements
+
+- **Node.js** 16+
+- **npm** (for Node.js dependencies)
+- **Python** 3.10+
+- **uv** (Python package manager)
+- **Rust** stable
+- **Cargo** (for Rust builds)
+
+## How It Works
+
+### Server Tests
+
+Each server test:
+
+1. Builds/prepares the server if needed
+2. Uses `mcp-test-client.ts` to connect to the server via stdio
+3. Sends MCP initialize and `tools/list` requests
+4. Verifies the server responds with a valid tool list
+5. Reports pass/fail
+
+### Client Tests
+
+Each client test:
+
+1. Builds/prepares the client if needed
+2. Runs the client CLI without an ANTHROPIC_API_KEY
+3. The client connects to a mock server, lists tools, and exits gracefully
+4. Verifies the client can connect and communicate via MCP protocol
+5. Reports pass/fail
+
+**Note**: Client tests run the actual CLI programs without an Anthropic API key. The clients are designed to handle missing API keys gracefully by listing available tools and exiting, which is perfect for smoke testing the MCP connectivity without requiring external API calls.
+
+## Test Helpers
+
+### mcp-test-client.ts
+
+A minimal MCP client that connects to a server, initializes the session, and lists available tools. Used to test servers without requiring a full client implementation.
+
+**Usage**:
+
+```bash
+node tests/helpers/build/mcp-test-client.js <command> [args...]
+```
+
+**Example**:
+
+```bash
+node tests/helpers/build/mcp-test-client.js python weather.py
+```
+
+### mock-mcp-server.ts
+
+A minimal MCP server that verifies clients call the `tools/list` method and returns an empty tool list. Used to test clients without requiring a real weather server. Exits with an error if the client doesn't call `tools/list`.
+
+**Usage**:
+
+```bash
+node tests/helpers/build/mock-mcp-server.js
+```
+
+## CI/CD Integration
+
+Tests run automatically on pull requests via GitHub Actions. See `.github/workflows/ci.yml` for the CI configuration.
+
+## Troubleshooting
+
+### Dependencies missing
+
+Install required dependencies:
+
+```bash
+# Python/uv
+curl -LsSf https://astral.sh/uv/install.sh | sh
+
+# Node.js (via nvm)
+nvm install 18
+
+# Rust
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+```
+
+## Adding New Tests
+
+To add a new test:
+
+1. Add a new test function in `smoke-test.sh` (e.g., `test_new_feature()`)
+2. Include dependency checks, builds, and test execution in the function
+3. Add a `run_test` call in the "Run all tests" section
+4. Update this README
+
+## Maintenance
+
+These tests are designed to be simple and low-maintenance:
+
+- Shell scripts for orchestration (language-agnostic)
+- Minimal TypeScript helpers for test infrastructure
+- No external API dependencies
diff --git a/tests/helpers/mcp-test-client.ts b/tests/helpers/mcp-test-client.ts
new file mode 100644
index 0000000..cf92b1c
--- /dev/null
+++ b/tests/helpers/mcp-test-client.ts
@@ -0,0 +1,61 @@
+#!/usr/bin/env node
+/**
+ * Minimal MCP Test Client for testing servers
+ * Connects to a server, initializes, and lists tools
+ */
+
+import { Client } from "@modelcontextprotocol/sdk/client/index.js";
+import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";
+
+async function testServer(command: string, args: string[]) {
+  console.error(`Testing server: ${command} ${args.join(" ")}`);
+
+  const transport = new StdioClientTransport({
+    command,
+    args,
+  });
+
+  const client = new Client(
+    {
+      name: "mcp-test-client",
+      version: "1.0.0",
+    },
+    {
+      capabilities: {},
+    }
+  );
+
+  try {
+    // Connect to server
+    await client.connect(transport);
+    console.error("✓ Connected to server");
+
+    // List tools
+    const { tools } = await client.listTools();
+    console.error(`✓ Listed ${tools.length} tools`);
+
+    // Success
+    console.error("✓ Server test passed");
+    await client.close();
+    process.exit(0);
+  } catch (error) {
+    console.error(`✗ Server test failed: ${error}`);
+    process.exit(1);
+  }
+}
+
+// Parse command line arguments
+const args = process.argv.slice(2);
+if (args.length < 1) {
+  console.error("Usage: mcp-test-client <command> [args...]");
+  console.error("Example: mcp-test-client node server.js");
+  process.exit(1);
+}
+
+const command = args[0];
+const commandArgs = args.slice(1);
+
+testServer(command, commandArgs).catch((error) => {
+  console.error(`Fatal error: ${error}`);
+  process.exit(1);
+});
diff --git a/tests/helpers/mock-mcp-server.ts b/tests/helpers/mock-mcp-server.ts
new file mode 100644
index 0000000..b872515
--- /dev/null
+++ b/tests/helpers/mock-mcp-server.ts
@@ -0,0 +1,49 @@
+#!/usr/bin/env node
+/**
+ * Mock MCP Server for testing clients
+ * Verifies that clients call the tools/list method and returns an empty tool list
+ */
+
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { ListToolsRequestSchema } from "@modelcontextprotocol/sdk/types.js";
+
+const server = new McpServer(
+  {
+    name: "mock-test-server",
+    version: "1.0.0",
+  },
+  {
+    capabilities: {
+      tools: {},
+    },
+  }
+);
+
+// Track whether tools/list was called
+let toolsListCalled = false;
+
+// Override the default tools/list handler to track calls
+server.server.setRequestHandler(ListToolsRequestSchema, async () => {
+  toolsListCalled = true;
+  return { tools: [] };
+});
+
+async function main() {
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+  console.error("Mock MCP Server running on stdio");
+}
+
+// Verify that tools/list was called when the connection closes
+process.stdin.on("end", () => {
+  if (!toolsListCalled) {
+    console.error("Error: Client did not call tools/list");
+    process.exit(1);
+  }
+});
+
+main().catch((error) => {
+  console.error("Server error:", error);
+  process.exit(1);
+});
diff --git a/tests/helpers/package-lock.json b/tests/helpers/package-lock.json
new file mode 100644
index 0000000..ea6f5e7
--- /dev/null
+++ b/tests/helpers/package-lock.json
@@ -0,0 +1,1133 @@
+{
+  "name": "mcp-test-helpers",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "mcp-test-helpers",
+      "version": "1.0.0",
+      "dependencies": {
+        "@modelcontextprotocol/sdk": "^1.22.0"
+      },
+      "devDependencies": {
+        "@types/node": "^22.13.4",
+        "typescript": "^5.7.3"
+      },
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
+    "node_modules/@modelcontextprotocol/sdk": {
+      "version": "1.22.0",
+      "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.22.0.tgz",
+      "integrity": "sha512-VUpl106XVTCpDmTBil2ehgJZjhyLY2QZikzF8NvTXtLRF1CvO5iEE2UNZdVIUer35vFOwMKYeUGbjJtvPWan3g==",
+      "license": "MIT",
+      "dependencies": {
+        "ajv": "^8.17.1",
+        "ajv-formats": "^3.0.1",
+        "content-type": "^1.0.5",
+        "cors": "^2.8.5",
+        "cross-spawn": "^7.0.5",
+        "eventsource": "^3.0.2",
+        "eventsource-parser": "^3.0.0",
+        "express": "^5.0.1",
+        "express-rate-limit": "^7.5.0",
+        "pkce-challenge": "^5.0.0",
+        "raw-body": "^3.0.0",
+        "zod": "^3.23.8",
+        "zod-to-json-schema": "^3.24.1"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@cfworker/json-schema": "^4.1.1"
+      },
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+        }
+      }
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+      "version": "22.19.1",
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+      "license": "MIT",
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+        "negotiator": "^1.0.0"
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+      "license": "MIT",
+      "dependencies": {
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+        "fast-uri": "^3.0.1",
+        "json-schema-traverse": "^1.0.0",
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+      },
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+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
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+      "version": "3.0.1",
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+        "qs": "^6.14.0",
+        "raw-body": "^3.0.0",
+        "type-is": "^2.0.0"
+      },
+      "engines": {
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+      }
+    },
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+      },
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+      },
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+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
+    },
+    "node_modules/zod": {
+      "version": "3.25.76",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
+      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+      "license": "MIT",
+      "peer": true,
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
+    },
+    "node_modules/zod-to-json-schema": {
+      "version": "3.24.6",
+      "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.24.6.tgz",
+      "integrity": "sha512-h/z3PKvcTcTetyjl1fkj79MHNEjm+HpD6NXheWjzOekY7kV+lwDYnHw+ivHkijnCSMz1yJaWBD9vu/Fcmk+vEg==",
+      "license": "ISC",
+      "peerDependencies": {
+        "zod": "^3.24.1"
+      }
+    }
+  }
+}
diff --git a/tests/helpers/package.json b/tests/helpers/package.json
new file mode 100644
index 0000000..5592d6d
--- /dev/null
+++ b/tests/helpers/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "mcp-test-helpers",
+  "version": "1.0.0",
+  "description": "Test helpers for MCP quickstart examples",
+  "type": "module",
+  "scripts": {
+    "build": "tsc",
+    "clean": "rm -rf build"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.22.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.13.4",
+    "typescript": "^5.7.3"
+  },
+  "engines": {
+    "node": ">=16.0.0"
+  }
+}
diff --git a/tests/helpers/tsconfig.json b/tests/helpers/tsconfig.json
new file mode 100644
index 0000000..e722753
--- /dev/null
+++ b/tests/helpers/tsconfig.json
@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "Node16",
+    "moduleResolution": "Node16",
+    "outDir": "./build",
+    "rootDir": "./",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true
+  },
+  "include": [
+    "*.ts"
+  ],
+  "exclude": [
+    "node_modules",
+    "build"
+  ]
+}
diff --git a/tests/smoke-test.sh b/tests/smoke-test.sh
new file mode 100755
index 0000000..e31908a
--- /dev/null
+++ b/tests/smoke-test.sh
@@ -0,0 +1,116 @@
+#!/bin/bash
+set -e
+
+# Source utilities
+source "$(dirname "$0")/utils.sh"
+
+print_header "MCP Quickstart Smoke Tests"
+
+# Get project root
+PROJECT_ROOT=$(get_project_root)
+TESTS_DIR="${PROJECT_ROOT}/tests"
+
+# Setup common test variables
+TEST_CLIENT="${PROJECT_ROOT}/tests/helpers/build/mcp-test-client.js"
+MOCK_SERVER="${PROJECT_ROOT}/tests/helpers/build/mock-mcp-server.js"
+
+# Track test results
+FAILED_TESTS=()
+PASSED_TESTS=()
+
+# Build test helpers
+ensure_helpers_built
+
+# Helper function to run a test and track results
+run_test() {
+    local test_name=$1
+    echo ""
+    print_header "Testing ${test_name}"
+
+    if "${@:2}"; then
+        PASSED_TESTS+=("${test_name}")
+        print_success "${test_name} test passed"
+    else
+        FAILED_TESTS+=("${test_name}")
+        print_error "${test_name} test failed"
+    fi
+}
+
+# Test: Python weather server
+test_weather_server_python() {
+    check_dependency uv
+    local server_dir="${PROJECT_ROOT}/weather-server-python"
+    node "${TEST_CLIENT}" uv --directory "${server_dir}" run weather.py
+}
+
+# Test: TypeScript weather server
+test_weather_server_typescript() {
+    check_dependency node
+    check_dependency npm
+    local server_dir="${PROJECT_ROOT}/weather-server-typescript"
+    ensure_built "${server_dir}"
+    node "${TEST_CLIENT}" node "${server_dir}/build/index.js"
+}
+
+# Test: Rust weather server
+test_weather_server_rust() {
+    check_dependency cargo
+    local server_dir="${PROJECT_ROOT}/weather-server-rust"
+    ensure_built "${server_dir}"
+
+    # Determine which binary to use
+    if [ -f "${server_dir}/target/release/weather" ]; then
+        local server_bin="${server_dir}/target/release/weather"
+    else
+        local server_bin="${server_dir}/target/debug/weather"
+    fi
+
+    node "${TEST_CLIENT}" "${server_bin}"
+}
+
+# Test: Python MCP client
+test_mcp_client_python() {
+    check_dependency uv
+    local client_dir="${PROJECT_ROOT}/mcp-client-python"
+    uv --directory "${client_dir}" run python "${client_dir}/client.py" "${MOCK_SERVER}" >/dev/null 2>&1
+}
+
+# Test: TypeScript MCP client
+test_mcp_client_typescript() {
+    check_dependency node
+    check_dependency npm
+    local client_dir="${PROJECT_ROOT}/mcp-client-typescript"
+    ensure_built "${client_dir}"
+    node "${client_dir}/build/index.js" "${MOCK_SERVER}" >/dev/null 2>&1
+}
+
+# Run all tests
+print_header "Running smoke tests"
+run_test "weather-server-python" test_weather_server_python
+run_test "weather-server-typescript" test_weather_server_typescript
+run_test "weather-server-rust" test_weather_server_rust
+run_test "mcp-client-python" test_mcp_client_python
+run_test "mcp-client-typescript" test_mcp_client_typescript
+
+# Print summary
+echo ""
+print_header "Test Summary"
+echo "Passed: ${#PASSED_TESTS[@]}"
+for test in "${PASSED_TESTS[@]}"; do
+    print_success "${test}"
+done
+
+if [ ${#FAILED_TESTS[@]} -gt 0 ]; then
+    echo ""
+    echo "Failed: ${#FAILED_TESTS[@]}"
+    for test in "${FAILED_TESTS[@]}"; do
+        print_error "${test}"
+    done
+    echo ""
+    print_error "Some tests failed"
+    exit 1
+else
+    echo ""
+    print_success "All tests passed!"
+    exit 0
+fi
diff --git a/tests/utils.sh b/tests/utils.sh
new file mode 100644
index 0000000..d3b2aa5
--- /dev/null
+++ b/tests/utils.sh
@@ -0,0 +1,86 @@
+#!/bin/bash
+# Shared utilities for test scripts
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Print functions
+print_header() {
+    echo -e "${YELLOW}==== $1 ====${NC}"
+}
+
+print_success() {
+    echo -e "${GREEN}✓ $1${NC}"
+}
+
+print_error() {
+    echo -e "${RED}✗ $1${NC}"
+}
+
+# Get project root directory
+get_project_root() {
+    cd "$(dirname "$0")/.." && pwd
+}
+
+# Check if command exists
+command_exists() {
+    command -v "$1" >/dev/null 2>&1
+}
+
+# Check dependency and exit if not found
+check_dependency() {
+    local cmd=$1
+    if ! command_exists "${cmd}"; then
+        print_error "${cmd} is not installed"
+        exit 1
+    fi
+}
+
+# Setup test environment
+setup_test() {
+    local test_name=$1
+    print_header "Testing ${test_name}"
+
+    PROJECT_ROOT=$(get_project_root)
+    SERVER_DIR="${PROJECT_ROOT}/${test_name}"
+    CLIENT_DIR="${PROJECT_ROOT}/${test_name}"
+    TEST_CLIENT="${PROJECT_ROOT}/tests/helpers/build/mcp-test-client.js"
+    MOCK_SERVER="${PROJECT_ROOT}/tests/helpers/build/mock-mcp-server.js"
+}
+
+# Ensure test helpers are built
+ensure_helpers_built() {
+    if [ ! -f "${TEST_CLIENT}" ] || [ ! -f "${MOCK_SERVER}" ]; then
+        print_error "Test helpers not built"
+        print_header "Building test helpers..."
+        cd "${PROJECT_ROOT}/tests/helpers" || exit 1
+        npm install >/dev/null 2>&1
+        npm run build >/dev/null 2>&1
+        cd - >/dev/null || exit 1
+        print_success "Test helpers built"
+    fi
+}
+
+# Ensure a project directory is built (TypeScript/Rust)
+ensure_built() {
+    local dir=$1
+    cd "${dir}" || exit 1
+
+    # Install npm dependencies if needed
+    if [ -f "package.json" ] && [ ! -d "node_modules" ]; then
+        npm install >/dev/null 2>&1
+    fi
+
+    # Build TypeScript if needed
+    if [ -f "tsconfig.json" ] && [ ! -f "build/index.js" ]; then
+        npm run build >/dev/null 2>&1
+    fi
+
+    # Build Rust if needed
+    if [ -f "Cargo.toml" ] && [ ! -f "target/release/weather" ] && [ ! -f "target/debug/weather" ]; then
+        cargo build --release >/dev/null 2>&1
+    fi
+}
diff --git a/weather-server-typescript/package-lock.json b/weather-server-typescript/package-lock.json
index c9e3d39..8420208 100644
--- a/weather-server-typescript/package-lock.json
+++ b/weather-server-typescript/package-lock.json
@@ -207,6 +207,7 @@
       "resolved": "https://registry.npmjs.org/zod/-/zod-3.24.2.tgz",
       "integrity": "sha512-lY7CDW43ECgW9u1TcT3IoXHflywfVqDYze4waEz812jR/bZ8FHDsl7pFQoSZTz5N+2NqRXs8GBwnAwo3ZNxqhQ==",
       "license": "MIT",
+      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }