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Add note about output_schema incongruity when responses are truncated

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Jeremiah Lowin 2026-02-06 18:10:18 -05:00
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docs/servers/middleware.mdx
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@ -585,6 +585,10 @@ def search(query: str) -> str:
When a response exceeds the limit, the middleware extracts all text content, joins it together, truncates to fit within the limit, and returns a single `TextContent` block. For non-text responses, the serialized JSON is used as the text source.
<Note>
If a tool defines an `output_schema`, truncated responses will no longer conform to that schema — the client will receive a plain `TextContent` block instead of the expected structured output. Keep this in mind when setting size limits for tools with structured responses.
</Note>
```python
# Limit only specific tools
mcp.add_middleware(ResponseLimitingMiddleware(