The original title is: "Prompt Injection for API Teams: What It Is and How to Test for It"

Short summary

A practical guide for API teams on prompt injection, covering both direct and indirect injection vectors. It explains the confused-deputy problem where credentialed agents can be tricked into misusing APIs, and recommends treating all model output as untrusted with independent validation. The guide includes testing strategies with mocked adversarial payloads aligned to OWASP LLM01.

• •Prompt injection affects APIs in two directions: agent calls to your API and API responses read by models
• •No general fix exists; defenses must focus on shrinking blast radius at the API boundary
• •Treat all model output as untrusted and never let raw model output drive privileged API calls

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