Update metaschema URI format in input_schema.rb

dr03ramos · web-flow · commit 5cd3ed78bdaf · 2025-09-10T13:57:55.000-03:00
Fixes #131. Tested on Windows and Linux. Added a "file://" prefix to prevent the JSON library from not identifying the URI correctly.
diff --git a/lib/mcp/tool/input_schema.rb b/lib/mcp/tool/input_schema.rb
@@ -50,7 +50,7 @@ def validate_schema!
           accept_uri: false,
           accept_file: ->(path) { path.to_s.start_with?(Gem.loaded_specs["json-schema"].full_gem_path) },
         )
-        metaschema = JSON::Validator.validator_for_name("draft4").metaschema
+        metaschema = "file://#{JSON::Validator.validator_for_name("draft4").metaschema}"
         errors = JSON::Validator.fully_validate(metaschema, schema, schema_reader: schema_reader)
         if errors.any?
           raise ArgumentError, "Invalid JSON Schema: #{errors.join(", ")}"

Original file line number	Diff line number	Diff line change
`@@ -50,7 +50,7 @@ def validate_schema!`
`50`	`50`	`accept_uri: false,`
`51`	`51`	`accept_file: ->(path) { path.to_s.start_with?(Gem.loaded_specs["json-schema"].full_gem_path) },`
`52`	`52`	`)`
`53`		`- metaschema = JSON::Validator.validator_for_name("draft4").metaschema`
	`53`	`+ metaschema = "file://#{JSON::Validator.validator_for_name("draft4").metaschema}"`
`54`	`54`	`errors = JSON::Validator.fully_validate(metaschema, schema, schema_reader: schema_reader)`
`55`	`55`	`if errors.any?`
`56`	`56`	`raise ArgumentError, "Invalid JSON Schema: #{errors.join(", ")}"`