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fix(model): don't treat _meta alone as a CallToolResult - #1405
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Any result type may carry `_meta`, so its presence says nothing about a
result being a tool call. Counting it as a known CallToolResult field let
CallToolResult shadow CustomResult in the untagged ServerResult union: a
custom result such as SEP-2640 `skills/list` with a top-level `_meta`
parsed as an empty CallToolResult and its payload was dropped.
Only `content`, `structuredContent`, and `isError` now satisfy the guard.
Like `{}`, a bare `{"_meta": {...}}` is no longer a CallToolResult; it
falls through to CustomResult.
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DaleSeo
approved these changes
Nov 5, 2026
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5 of 9 tasks
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Motivation and Context
There is existing logic to avoid
CallToolResultfrom shadowingCustomResult. However, since any type can hold_metathis doesn't really work.In real world I am trying to use the skills extension deserialized into
CustomResult. When_metais present this fails.How Has This Been Tested?
Manually tested end to end + added/updated unit tests
Breaking Changes
No
Types of changes
Checklist
Additional context