Hi,

Did you already read OutSystems MCP - OutSystems 11 Documentation? 

@Sunil Rajput : You can find the exact steps using Claude Code @ https://www.outsystems.com/forums/discussion/107095/unable-to-browse-os-11-mcp-url-getting-405/#Post471220 

Hi Sunil,

The MCP links above are about letting Claude work on your code in Service Studio. If what you want is for your app to call Claude at runtime (user types a prompt, the screen shows Claude's answer), you consume the Anthropic Messages API as a regular REST API. Steps:

1. Get an API key
Create one in the Claude Console (console.anthropic.com). Never put it in client-side logic. Store it in a Site Property (e.g. ClaudeApiKey, Text) and set its value in Service Center, so it only lives on the server.

2. Consume the REST method
Logic tab > Integrations > REST > right-click > Consume REST API > Add single method.
- Method: POST https://api.anthropic.com/v1/messages
- Headers: x-api-key (make it an input parameter), anthropic-version: 2023-06-01, content-type: application/json
- Request body example:
{"model":"MODEL_ID","max_tokens":1024,"messages":[{"role":"user","content":"Hello"}]}
- Response body example:
{"id":"msg_01","type":"message","role":"assistant","content":[{"type":"text","text":"Hi! How can I help?"}],"stop_reason":"end_turn","usage":{"input_tokens":10,"output_tokens":8}}
Click Test with your key, then Copy to response body, and Finish. Service Studio generates the request/response structures for you. Replace MODEL_ID with a current model ID from the models page in Anthropic's docs (docs.claude.com).

3. Wrap it in a server action
Create AskClaude (input Prompt, output Answer):
- Build the request: model, max_tokens, and a Messages list with one item (role = "user", content = Prompt).
- Call the REST method, passing Site.ClaudeApiKey to the x-api-key header.
- Assign Answer = Response.content.Current.text (or loop the content list and concatenate the items where type = "text").

4. Show it on a screen
Screen with a local variable Prompt bound to an Input (or Text Area), a local variable Answer, a Button whose client action calls AskClaude and assigns the output to Answer, and an Expression showing Answer. For a chat, keep a list of {role, content} records, append the user message and Claude's reply each turn, and send the whole list in messages so Claude has the conversation context.

5. Things to handle
- Errors: 401 = bad key, 429 = rate limit, 529 = overloaded. Add an Exception Handler and show a friendly message.
- Long answers can take a while: raise the REST method Timeout if needed and show a loading state on the button.
- Optional: the system field in the body lets you give Claude instructions for your app (tone, language, what it should and shouldn't answer).

Hope this helps!