Returns table foreign key
AI agents call get_table_foreign_key to retrieve information from PostgreSQL MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves schema metadata (foreign key constraints) from a PostgreSQL database. It performs a read-only query operation with no side effects, no code execution, and no data modification. The blast radius of misuse is minimal—an attacker could learn database structure but cannot modify, delete, or execute operations.
From the tool's definition Tool 'get_table_foreign_key' returns table foreign key metadata; described as part of 'querying PostgreSQL database metadata'; verb 'Returns' indicates data retrieval with no modification capability.
Attacks that exploit this kind of access
Returns table foreign key. It is categorised as a Read tool in the PostgreSQL MCP Server MCP Server, which means it retrieves data without modifying state.
Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for get_table_foreign_key: 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 PostgreSQL MCP Server. Nothing to install.
get_table_foreign_key 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 get_table_foreign_key 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 get_table_foreign_key. 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.
get_table_foreign_key is provided by the PostgreSQL MCP Server MCP server (physci/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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