Accessing resources

Core Concept

• MCP client needs a function to request resources defined in the MCP server
• The read_resource function fetches a resource by URI and parses the response based on MIME type

Implementation Steps

Imports Required

• json module for parsing JSON data
• AnyUrl from PyDantic for type handling

Function Logic

• Call await self. session. read_resource() with the resource URI wrapped in AnyUrl
• Extract the first element from result. contents list
• Access the mime_type property to determine data format

Response Handling

• If MIME type is application/json: parse text content using json. loads() and return parsed data
• Otherwise: return raw text content as-is

Integration

• The read_resource function is called from other parts of the codebase
• Enables the CLI application to fetch and insert resource contents into prompts
• Resources are sent to Claude without requiring tool calls to read them

Testing

• CLI application can list available resources and select them
• Selected resource contents are automatically included in prompts sent to Claude

Takeaways

• MCP client uses read_resource() to fetch resources by URI and parse responses based on MIME type
• Response handling differs by MIME type: application/json requires json. loads() parsing, other types return raw text
• Resources are automatically fetched and inserted into prompts sent to Claude without requiring tool calls