Change Icon.sizes from string to string array#1531
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dsp-ant merged 2 commits intomainmodelcontextprotocol/modelcontextprotocol:mainfrom Sep 29, 2025
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Change Icon.sizes from string to string array#1531dsp-ant merged 2 commits intomainmodelcontextprotocol/modelcontextprotocol:mainfrom icon-sizes-arraymodelcontextprotocol/modelcontextprotocol:icon-sizes-arrayCopy head branch name to clipboard
dsp-ant merged 2 commits intomainmodelcontextprotocol/modelcontextprotocol:mainfrom
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Introduces standardized tiering system for MCP SDKs based on: - Specification compliance - Maintenance quality - Update frequency Defines three tiers to help developers choose appropriate SDKs and provide clear improvement pathways for maintainers.
The Icon.sizes field was previously defined as a space-separated string (e.g., "48x48 96x96"), which was ambiguous and error-prone to parse. Changed to string[] format (e.g., ["48x48", "96x96"]) for clarity and consistency. Each size is now a discrete array element, making it easier to iterate over and validate individual size specifications. This maintains compatibility with the "any" keyword for scalable formats while providing a cleaner, more structured representation. Co-Authored-By: Claude <noreply@anthropic.com>
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pja-ant
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Sep 25, 2025
bhosmer-ant
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No objections, but this is a breaking change, right?
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Icons are introduced in the upcoming spec, so it's not breaking any existing non-draft spec. |
dend
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Sep 27, 2025
localden
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Sep 27, 2025
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modelcontextprotocol/typescript-sdk#947 is updated for TypeScript side. I'll update the python impl to reflect this. |
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Changes Icon.sizes from a space-separated string to a list of strings, aligning with spec changes in modelcontextprotocol/modelcontextprotocol#1531. This provides clearer, more consistent size specifications that are easier to iterate over and validate. Updated all examples and tests to use the new list format.
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mcp/protocol: Implement SEP-973 - Define Icon structure, which includes source, mimeType and sizes. - sizes is any array of strings. refer modelcontextprotocol/modelcontextprotocol#1531 - Support setting websiteUrl, icons for mcp.Implementation - Support setting icons for mcp.Prompt - Support setting icons for mcp.Tool - Support setting icons for mcp.Resource Fixes #552
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The Icon.sizes field was previously defined as a space-separated string (e.g., "48x48 96x96"), which was ambiguous and error-prone to parse.
Changed to string[] format (e.g., ["48x48", "96x96"]) for clarity and consistency. Each size is now a discrete array element, making it easier to iterate over and validate individual size specifications.
This maintains compatibility with the "any" keyword for scalable formats while providing a cleaner, more structured representation.