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Validate tool annotations value

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Tool annotations were introduced in the "2025-03-26" specification:

> Added comprehensive tool annotations for better describing tool behavior,
> like whether it is read-only or destructive (PR modelcontextprotocol/modelcontextprotocol#185)

https://modelcontextprotocol.io/specification/2025-03-26/changelog#major-changes

This means they are not supported in the "2024-11-05" specification,
so validation errors will be raised for `protocol_version: "2024-11-05"`.
This commit is contained in:
Koichi ITO 2025-09-01 01:10:15 +09:00
commit 08048283e4
1 changed files with 47 additions and 4 deletions
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26
lib/mcp/server.rb
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@ -59,10 +59,7 @@ module MCP
@server_context = server_context
@configuration = MCP.configuration.merge(configuration)
if @configuration.protocol_version == "2024-11-05" && @instructions
message = "`instructions` supported by protocol version 2025-03-26 or higher"
raise ArgumentError, message
end
validate!
@capabilities = capabilities || default_capabilities
@ -102,6 +99,8 @@ module MCP
def define_tool(name: nil, title: nil, description: nil, input_schema: nil, annotations: nil, &block)
tool = Tool.define(name:, title:, description:, input_schema:, annotations:, &block)
@tools[tool.name_value] = tool
validate!
end
def define_prompt(name: nil, title: nil, description: nil, arguments: [], &block)
@ -171,6 +170,25 @@ module MCP
private
def validate!
if @configuration.protocol_version == "2024-11-05"
if @instructions
message = "`instructions` supported by protocol version 2025-03-26 or higher"
raise ArgumentError, message
end
error_tool_names = @tools.each_with_object([]) do |(tool_name, tool), error_tool_names|
if tool.annotations
error_tool_names << tool_name
end
end
unless error_tool_names.empty?
message = "Error occurred in #{error_tool_names.join(", ")}. `annotations` are supported by protocol version 2025-03-26 or higher"
raise ArgumentError, message
end
end
end
def handle_request(request, method)
handler = @handlers[method]
unless handler