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API keys are just ID badges. They prove who the agent is, but they cannot stop an agent from doing something it should not.
If an agent is tricked by a prompt injection into deleting a Gmail thread, a scoped API key will let it happen because the agent has the right credentials.
I condensed the logic of moving security to the transport layer into a visual field guide — swipe through below.
The solution is an LLM-as-a-judge proxy like CrabTrap.
It acts as a security guard sitting between your agent and the internet.
The mechanism works in four steps:
The proxy intercepts the outbound network request before it leaves your internal network.
It sends the request payload and your security policies to a separate LLM.
This judge LLM reasons through the intent to see if the action violates a policy.
The proxy then returns a binary Allow or Block decision.
For an ops leader, this turns security from a guessing game of hardcoded rules into a system based on observed behavior.
Instead of spending weeks hand-tuning tokens for every new capability, you define natural-language policies that the judge enforces in real time.
The full breakdown and the interception loop diagram are in the 12-page guide below.
How are you currently preventing prompt injections from triggering unauthorized API actions in your agents?
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