Add support for context-only resources (#1405) #1406
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Hi @0Delta thank you for this contribution - are you running into this limitation with a concrete application you're trying to implement? If so would you be able to provide some additional details as a motivating example for this change?
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Hi @felixweinberger. from mcp.server.fastmcp import Context, FastMCP
mcp = FastMCP()
@mcp.resource("resource://user_profile")
def get_user_profile(ctx: Context) -> str:
ctx.info("Fetching user profile")
return "Profile data for user..."When I tried to display this in Inspector, Inspector mistakenly thought it needed arguments and wouldn't run. 
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This resource should be recognized as just a Resource, not a template, right? |
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Add support for context-only resources (modelcontextprotocol#1406)
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Add support for context-only resources
Motivation and Context
#1405
Currently, it is not possible to define a Resource that takes only the Context parameter as an argument. When attempting to create such a resource, the registration logic incorrectly classifies it as a template resource instead of a regular resource.
This limitation prevents developers from creating resources that need access to server session context but don't require dynamic URI components, reducing flexibility in resource design.
How Has This Been Tested?
Breaking Changes
No breaking changes. The
contextparameter inResource.read()method is optional with defaultNone. All existing resource implementations continue to work unchanged.Types of changes
Checklist
Additional context