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[Server] Always emit items for array tool parameter schemas (#378)

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Array tool parameters without an inferable element type generated `{"type":"array"}` with no `items`, which strict MCP clients (VS Code / Copilot) reject. Always emit `items` (`{}` when the element type is unknown) and recover the element type for nullable typed arrays such as `string[]|null`.

Fixes #151
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Valeriu Gutu 2026-07-15 00:56:50 +03:00 • committed by GitHub
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CHANGELOG.md
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@ -6,6 +6,7 @@ All notable changes to `mcp/sdk` will be documented in this file.
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* Allow `[$instance, 'methodName']` as an element handler in `Builder::addTool()`, `addResource()`, `addResourceTemplate()`, and `addPrompt()`. Unblocks handlers with constructor dependencies that the container-less `new $className()` fallback cannot build.
* Always emit an `items` schema for array tool parameters: untyped arrays get `items: {}` and nullable typed arrays (e.g. `string[]|null`) keep their element type. Fixes strict clients rejecting tools with "array type must have items" (#151).
0.6.0
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