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[Server] Fix result lists being sent as JSON objects - #656
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chr-hertel merged 1 commit intoNov 2, 2026
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chr-hertel
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November 2, 2026 22:04
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🟢 Approval recommended
No active review issues remain for the resource-read serialization changes.
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What changed in this PR
Fixes resource-read serialization in the PHP MCP SDK so non-list arrays produce JSON arrays and repeated named keys in nested mixed results no longer cause content loss.
Changes:
- Reindexes
contentsduring serialization and appends nested resource contents in order. - Adds regression coverage for non-list keys and updates nested-result assertions.
- Corrects the serialization return annotation, removes its PHPStan baseline entry, and documents the fixes.
| File | Description |
|---|---|
tests/Unit/Schema/Result/ReadResourceResultTest.php |
Tests list serialization for named and sparse numeric keys. |
tests/Unit/Capability/Formatter/ResourceResultFormatterTest.php |
Verifies flattening preserves all contents and their order. |
src/Schema/Result/ReadResourceResult.php |
Reindexes serialized contents and corrects the return annotation. |
src/Capability/Formatter/ResourceResultFormatter.php |
Appends nested contents without replacing matching named keys. |
phpstan-baseline.neon |
Removes the resolved return-type suppression. |
CHANGELOG.md |
Documents both resource-read fixes. |
Review effort: Balanced
Non-list handler results of tools, prompts and resources now serialize as an array, and named keys in mixed results no longer overwrite each other.
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contents of a resource read being sent as a JSON object
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Spotted while reviewing #650 & #651, but not caused by them.
array_filter(), sentcontent,messagesorcontentsas a JSON object instead of an array - now re-indexed injsonSerialize(), like the other list results