API

Fluent Builder API reference for open-mcp-guardrails. All builders are immutable — each method returns a new object.

Detection Builders

Create rules that scan content for sensitive information and injections.

Function	Description
pii	PII (personal information) detection
secrets	API key & token detection
promptInjection	Prompt injection attack detection
contentFilter	Custom pattern filtering

Flow & Tool Builders

Create rules that control tool call ordering and arguments.

Function	Description
flow	Tool call sequence control
tool	Tool argument validation
custom	Arbitrary custom logic

Configuration

Function	Description
defineConfig	Create a config object