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Add automatic _meta parameter extraction support

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This commit is contained in:
Eric Kreutzer 2026-03-04 10:11:07 -07:00
commit 50cd86c01c
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1 changed files with 282 additions and 4 deletions
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21
lib/mcp/server.rb
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@ -419,7 +419,7 @@ module MCP
end
end
call_tool_with_args(tool, arguments)
call_tool_with_args(tool, arguments, server_context_with_meta(request))
rescue RequestHandlerError
raise
rescue => e
@ -445,7 +445,7 @@ module MCP
prompt_args = request[:arguments]
prompt.validate_arguments!(prompt_args)
call_prompt_template_with_args(prompt, prompt_args)
call_prompt_template_with_args(prompt, prompt_args, server_context_with_meta(request))
end
def list_resources(request)
@ -488,7 +488,7 @@ module MCP
parameters.any? { |type, name| type == :keyrest || name == :server_context }
end
def call_tool_with_args(tool, arguments)
def call_tool_with_args(tool, arguments, server_context)
args = arguments&.transform_keys(&:to_sym) || {}
if accepts_server_context?(tool.method(:call))
@ -498,12 +498,25 @@ module MCP
end
end
def call_prompt_template_with_args(prompt, args)
def call_prompt_template_with_args(prompt, args, server_context)
if accepts_server_context?(prompt.method(:template))
prompt.template(args, server_context: server_context).to_h
else
prompt.template(args).to_h
end
end
def server_context_with_meta(request)
meta = request[:_meta]
if @server_context && meta
context = @server_context.dup
context[:_meta] = meta
context
elsif meta
{ _meta: meta }
elsif @server_context
@server_context
end
end
end
end