AI agents call get_foreign_keys to retrieve information from Mcp Odbc without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries database schema metadata (foreign key constraints) and returns information with no side effects. It is a pure read operation that retrieves structural information about table relationships, consistent with other discovery tools like 'describe_table' and 'get_primary_keys' on the same server.
From the tool's definition Tool name 'get_foreign_keys' and description 'Get foreign key relationships for a table' indicate schema introspection that retrieves metadata without modifying data.
Attacks that exploit this kind of access
Get foreign key relationships for a table. It is categorised as a Read tool in the Mcp Odbc MCP Server, which means it retrieves data without modifying state.
Register the Mcp Odbc MCP server in PolicyLayer and add a rule for get_foreign_keys: 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 Mcp Odbc. Nothing to install.
get_foreign_keys 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_foreign_keys 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_foreign_keys. 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_foreign_keys is provided by the Mcp Odbc MCP server (phil-cheesman/mcp-odbc). 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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