Render type as a single string #209
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> The type keyword can take two forms: > A single string. When it is a single string, it must be one of the types mentioned above (array, boolean, integer, number, null, object, regular expressions, or string). This specifies that the instance data is only valid when it matches that specific type. > An array of strings. When type is used as an array, it contains more than one string specifying the types mentioned above. In this case, the instance data is valid if it matches any of the given types. This pull-request serializes type as a single string instead of an array. That it is to say, instead of `[“object]”` it uses `”object”`. I am working on the [Micronaut MCP Server](https://github.com/micronaut-projects/micronaut-mcp) implementation. To implement tools, you have to provide a [JSON Schema of the Tool](https://modelcontextprotocol.io/specification/2025-06-18/server/tools#listing-tools). Under the hood, we use the MCP Java SDK which [requires type to be a single string](https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp/src/main/java/io/modelcontextprotocol/spec/McpSchema.java#L1218).
sdelamo
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sdelamo
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andriy-dmytruk
approved these changes
Aug 13, 2025
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Type Keyword:
This pull-request serializes type as a single string instead of an array. That it is to say, instead of
[“object]”it uses”object”.I am working on the Micronaut MCP Server implementation. To implement tools, you have to provide a JSON Schema of the Tool. Under the hood, we use the MCP Java SDK which requires type to be a single string.