> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/mcp-integration-contributor-guide/python-implementation.md).
# Python implementation
Your MCP integration's main function should do the following:
* Create an MCPApiModule Client instance with the vendor’s MCP server URL and authentication details.
* Route commands to the appropriate handler.
* Use MCPApiModule for all MCP operations.
* Handle errors using `extract_root_error_message()` and `return_error()`.
* Always close the client connection in a finally block.
#### Key principles
* Use hard-coded vendor-specific values (server URL, auth type, command prefix, server name) as constants.
* Extract only user-configurable parameters from `demisto.params()`, including tokens, credentials, and custom headers.
* Use BaseException in error handling to catch async exception groups.
* Mark the main function with `# pragma: no cover`.
For a simple token-based example, see `Packs/GitHubMCP/Integrations/GitHubMCP/GitHubMCP.py` . For a multi-auth example, see `Packs/GenericMCP/Integrations/GenericMCP/GenericMCP.py`
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