Add range validation for MCP::Annotations#priority per MCP specification#410
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koic merged 1 commit intoJun 15, 2026
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…ation ## Motivation and Context The MCP specification constrains `Annotations.priority` to the 0–1 range (`@minimum 0`, `@maximum 1`), but the Ruby SDK accepts any value. The other official SDKs already enforce this (TypeScript, Python, and PHP). This follows the existing pattern in `MCP::Icon`, which validates its constrained `theme` value in the constructor and raises `ArgumentError`. ## How Has This Been Tested? Added tests in `test/mcp/annotations_test.rb`: - valid `priority` at the lower (0) and upper (1) bounds is accepted - out-of-range `priority` (above 1, below 0) raises `ArgumentError` The full unit suite and RuboCop pass locally. ## Breaking Changes Strictly speaking yes: a caller that currently passes an out-of-range `priority` (e.g. `priority: 99`) will now get an `ArgumentError`. Such values already violate the MCP specification, and `nil` / in-range values are unaffected.
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koic
approved these changes
Jun 15, 2026
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Motivation and Context
The MCP specification constrains
Annotations.priorityto the 0–1 range (@minimum 0,@maximum 1) (schema), but the Ruby SDK accepts any value. The other official SDKs already enforce this (TypeScript, Python, and PHP).This follows the existing pattern in
MCP::Icon, which validates its constrainedthemevalue in the constructor and raisesArgumentError.How Has This Been Tested?
Added tests in
test/mcp/annotations_test.rb:priorityat the lower (0) and upper (1) bounds is acceptedpriority(above 1, below 0) raisesArgumentErrorThe full unit suite and RuboCop pass locally.
Breaking Changes
Strictly speaking yes: a caller that currently passes an out-of-range
priority(e.g.priority: 99) will now get anArgumentError. Such values already violate the MCP specification, andnil/ in-range values are unaffected.Types of changes
Checklist