mismatch between uri parameters set() and function parameters {'ctx'} #1215

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1. Spark-Liang commented on Aug 1, 2025

   

   Spark-Liang

   on Aug 1, 2025

   Last edited by Spark-Liang

   More actions

   seem this also happen in 1.9.4 .
   Python 3.11

   relative code:

       @mcp.resource("file://{path}")
       async def read_file_resource(
           context: Context,
           path: str
       ) -> str:
           """
           作为资源读取文件内容
   
           Args:
               path: 文件的绝对路径
   
           Returns:
               文件内容
           """
           resolved_path = await check_path_allowed_and_resolve_async(path, allowed_dirs, context)
           return await filesystem_service.read_text_file(str(resolved_path))

   error message:

   fn = <function define_mcp_server.<locals>.read_file_resource at 0x000001637F9E5760>
   
       def decorator(fn: AnyFunction) -> AnyFunction:
           # Check if this should be a template
           has_uri_params = "{" in uri and "}" in uri
           has_func_params = bool(inspect.signature(fn).parameters)
   
           if has_uri_params or has_func_params:
               # Validate that URI params match function params
               uri_params = set(re.findall(r"{(\w+)}", uri))
               func_params = set(inspect.signature(fn).parameters.keys())
   
               if uri_params != func_params:
   >               raise ValueError(
                       f"Mismatch between URI parameters {uri_params} " f"and function parameters {func_params}"  
                   )
   E               ValueError: Mismatch between URI parameters {'path'} and function parameters {'path', 'context'}
   
2. Kludex

   closed this as a duplicateof @app.resource() does not accept ctx: Context #244 on Aug 9, 2025