- In short
- Capability hallucination is when Claude claims to have performed an external action it was never able to take, such as sending an email or saving a file. In a standard chat interface Claude only acts on the conversation, connected tools, and uploaded files it was actually given access to, so any claimed external action should be treated as unverified until independently confirmed. It differs from a factual hallucination because it is a false claim about what was done, not about what is true.
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