# AI Persona using Categories tool- "An empty string is not a valid JSON string"

**URL:** https://meta.discourse.org/t/ai-persona-using-categories-tool-an-empty-string-is-not-a-valid-json-string/352565
**Category:** Bug
**Tags:** ai, ai-bot
**Created:** [February 16, 2025, 3:58pm UTC](https://meta.discourse.org/t/ai-persona-using-categories-tool-an-empty-string-is-not-a-valid-json-string/352565 "2025-02-16T15:58:24Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![sam](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/sam/32/102149_2.png) [@sam](https://meta.discourse.org/u/sam)
#### Post date: [February 16, 2025, 10:38pm UTC](https://meta.discourse.org/t/ai-persona-using-categories-tool-an-empty-string-is-not-a-valid-json-string/352565/2 "2025-02-16T22:38:09Z")

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Confirmed, this is a bug in native tools for sonnet/haiku. will have a look.

Work around is to use XML tools.

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_[View the full topic](https://meta.discourse.org/t/ai-persona-using-categories-tool-an-empty-string-is-not-a-valid-json-string/352565)._