diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
new file mode 100644
index 0000000..2b6c87d
--- /dev/null
+++ b/.github/workflows/claude.yml
@@ -0,0 +1,50 @@
+name: Claude Code
+
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened, assigned]
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  claude:
+    if: |
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review' && contains(github.event.review.body, '@claude')) ||
+      (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: read
+      issues: read
+      id-token: write
+      actions: read # Required for Claude to read CI results on PRs
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Run Claude Code
+        id: claude
+        uses: anthropics/claude-code-action@v1
+        with:
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+
+          # This is an optional setting that allows Claude to read CI results on PRs
+          additional_permissions: |
+            actions: read
+
+          # Optional: Give a custom prompt to Claude. If this is not specified, Claude will perform the instructions specified in the comment that tagged it.
+          # prompt: 'Update the pull request description to include a summary of changes.'
+
+          # Optional: Add claude_args to customize behavior and configuration
+          # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
+          # or https://docs.claude.com/en/docs/claude-code/cli-reference for available options
+          # claude_args: '--allowed-tools Bash(gh pr:*)'
+
diff --git a/mcp-client-python/client.py b/mcp-client-python/client.py
index 1194840..c53b39b 100644
--- a/mcp-client-python/client.py
+++ b/mcp-client-python/client.py
@@ -64,7 +64,7 @@ class MCPClient:
 
         # Initial Claude API call
         response = self.anthropic.messages.create(
-            model="claude-3-5-sonnet-20241022",
+            model="claude-sonnet-4-0",
             max_tokens=1000,
             messages=messages,
             tools=available_tools
@@ -97,7 +97,7 @@ class MCPClient:
 
                 # Get next response from Claude
                 response = self.anthropic.messages.create(
-                    model="claude-3-5-sonnet-20241022",
+                    model="claude-sonnet-4-0",
                     max_tokens=1000,
                     messages=messages,
                 )
diff --git a/mcp-client-typescript/index.ts b/mcp-client-typescript/index.ts
index be89f65..150434c 100644
--- a/mcp-client-typescript/index.ts
+++ b/mcp-client-typescript/index.ts
@@ -92,7 +92,7 @@ class MCPClient {
 
     // Initial Claude API call
     const response = await this.anthropic.messages.create({
-      model: "claude-3-5-sonnet-20241022",
+      model: "claude-sonnet-4-0",
       max_tokens: 1000,
       messages,
       tools: this.tools,
@@ -100,7 +100,6 @@ class MCPClient {
 
     // Process response and handle tool calls
     const finalText = [];
-    const toolResults = [];
 
     for (const content of response.content) {
       if (content.type === "text") {
@@ -114,7 +113,6 @@ class MCPClient {
           name: toolName,
           arguments: toolArgs,
         });
-        toolResults.push(result);
         finalText.push(
           `[Calling tool ${toolName} with args ${JSON.stringify(toolArgs)}]`,
         );
@@ -127,7 +125,7 @@ class MCPClient {
 
         // Get next response from Claude
         const response = await this.anthropic.messages.create({
-          model: "claude-3-5-sonnet-20241022",
+          model: "claude-sonnet-4-0",
           max_tokens: 1000,
           messages,
         });
diff --git a/weather-server-python/weather.py b/weather-server-python/weather.py
index 74a3015..5822b4e 100644
--- a/weather-server-python/weather.py
+++ b/weather-server-python/weather.py
@@ -89,6 +89,9 @@ Forecast: {period['detailedForecast']}
 
     return "\n---\n".join(forecasts)
 
-if __name__ == "__main__":
+def main():
     # Initialize and run the server
-    mcp.run(transport='stdio')
+    mcp.run(transport='stdio')    
+
+if __name__ == "__main__":
+    main()