Question 1

What is an agent tool-call guard?

Accepted Answer

It is a policy gateway that evaluates each LLM tool or MCP call against rules and classifiers before execution—often with audit and enforce phases.

Question 2

How is this different from LocalGuard?

Accepted Answer

LocalGuard redacts secrets in outbound content. Tool-call guards decide whether a tool invocation is allowed, warned, or denied based on intent and policy.

Question 3

What is OpenRouter Armor?

Accepted Answer

Armor is OpenRouter’s documented beta plugin surface for tool-call protection—useful as a reference implementation when evaluating guard architecture.

Question 4

Do I still need human approval?

Accepted Answer

Guards reduce volume and catch obvious misuse; high-risk environments may still require human-in-the-loop for selected tools.

Agent Tool-Call Guard: Policy Between Your Model and Its Tools

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