> I'm curious what people are sending to Claude that is so secret.

When Claude is used in a professional setting, any or all of:

  Proprietary intellectual property (a.k.a. system code)
  PII[0] of the employee, customers, or both
  HIPAA[1] data known to a system
  Internal communications not meant to be publicized
  Sensitive data, such as SSH keys and the like

Pretty much anything on a machine which uses Anthropic/OpenAI native tools is a candidate to be compromised really.

0 - https://en.wikipedia.org/wiki/Personal_data

1 - https://en.wikipedia.org/wiki/Health_Insurance_Portability_a...