Dry schema monkey patching breaks dry schema

[thisismydesign]

I had a working dry schema:

    optional(:pickup_attributes).hash(
      Dry::Schema.Params {
        optional(:name).value(:string)
        optional(:address).value(:string)
        optional(:latitude)
        optional(:longitude)
      } | Dry::Schema.Params {
        optional(:pickup_location_id).value(:string, :uuid_v4?)
      }
    )

After adding fast-mcp this code breaks because the gem monkey patches something

fast-mcp/lib/mcp/tool.rb

Lines 85 to 99 in 7ec08b9

	def call(&block)
	if block
	# Use current context to track nested context if available
	context = MetadataContext.current
	if context
	context.with_nested(name) do
	original_call(&block)
	end
	else
	original_call(&block)
	end
	else
	original_call(&block)
	end
	end

This should be avoided, or loading the dry schema integration should be made optional.

Stack:

An error occurred while loading rails_helper.
Failure/Error:
  optional(:pickup_attributes).hash(
    Dry::Schema.Params {
      optional(:name).value(:string)
      optional(:address).value(:string)
      optional(:latitude)
      optional(:longitude)
    } | Dry::Schema.Params {
      optional(:pickup_location_id).value(:string, :uuid_v4?)
    }
  )

ArgumentError:
  wrong number of arguments (given 1, expected 0)
# ./vendor/bundle/ruby/3.4.0/gems/fast-mcp-1.6.0/lib/mcp/tool.rb:85:in 'call'
# ./vendor/bundle/ruby/3.4.0/gems/dry-schema-1.14.1/lib/dry/schema/macros/dsl.rb:136:in 'block in Dry::Schema::Macros::DSL#hash'
# ./vendor/bundle/ruby/3.4.0/gems/dry-schema-1.14.1/lib/dry/schema/macros/dsl.rb:208:in 'Dry::Schema::Macros::DSL#append_macro'
# ./vendor/bundle/ruby/3.4.0/gems/dry-schema-1.14.1/lib/dry/schema/macros/dsl.rb:135:in 'Dry::Schema::Macros::DSL#hash'
# ./app/my-code:35:in 'block in <class:MyClass>'

[visini]

See #161

[thisismydesign]

Thanks for that @visini!

I also think this gem should not monkey-patch at all, as that can lead to similar issues in the future, eg when dry struct gets an update