Show all active PII detection results and masking rules.
AI agents call list_masking_rules to retrieve information from Postgres Safe without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays existing masking rules and PII detection results without creating, modifying, deleting, or executing any operations. It is a pure information retrieval function.
From the tool's definition Tool name 'list_masking_rules' and description 'Show all active PII detection results and masking rules' indicate a retrieval/query operation with no side effects.
Attacks that exploit this kind of access
Show all active PII detection results and masking rules. It is categorised as a Read tool in the Postgres Safe MCP Server, which means it retrieves data without modifying state.
Register the Postgres Safe MCP server in PolicyLayer and add a rule for list_masking_rules: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Postgres Safe. Nothing to install.
list_masking_rules is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_masking_rules rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for list_masking_rules. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
list_masking_rules is provided by the Postgres Safe MCP server (sam-david/pg-redact-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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