Recipes

Guard customer data

For an agent that exports records, in 15 frameworks.

Last reviewed 2026-10-02

An export that includes social security numbers is refused; other fields export. On a list, contains means one of the items equals the value.

The rule

{
  "name": "customer-data-guard",
  "effect": "deny",
  "priority": 10,
  "match_path": "/tools/export_customers",
  "conditions": [
    {
      "field": "fields",
      "op": "contains",
      "value": "ssn"
    }
  ]
}

Measured on production (2026-10-02, rule tester): the risky call below matches this rule and the safe one does not.

Risky	`{"segment": "all", "fields": ["email", "ssn"]}`
Safe	`{"segment": "all", "fields": ["email", "plan"]}`

Pick your framework

Framework	Tool name CAIN sees	Plugs into
Python (any function)	`export_customers`	the function that acts
LangChain	`export_customers`	your agent's tool list
LangGraph	`export_customers`	the tools your graph's nodes call
OpenAI Agents SDK	`export_customers`	function tools
CrewAI	`export_customers`	CrewAI's before-tool-call hooks
LlamaIndex	`export_customers`	FunctionTool
Pydantic AI	`export_customers`	an agent capability
AutoGen (agentchat)	`export_customers`	the callables you give AssistantAgent
Google ADK	`export_customers`	the functions in an agent's tools
Claude Agent SDK	`mcp__ops__export_customers`	PreToolUse hooks
MCP client (Python)	`export_customers`	any MCP client session
OpenTelemetry	`export_customers`	your existing tracing
Any other framework	`export_customers`	any Python callable
TypeScript / JavaScript	`export_customers`	any async function
HTTP (any language)	`export_customers`	your own call site

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