AI agents call describe_table 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 retrieves table schema metadata (columns, types, constraints, etc.) without modifying data. It is a Read operation with medium severity because unintended schema disclosure could expose sensitive database structure information to an AI agent, but no data is modified or deleted.
From the tool's definition Tool name is 'describe_table' and the server description states 'schema discovery + query tools' with 'Read-only by default'. The sibling tool names (list_tables, get_primary_keys, get_foreign_keys) all indicate schema introspection without modification.
Attacks that exploit this kind of access
describe_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 describe_table: 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.
describe_table 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 describe_table 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 describe_table. 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.
describe_table 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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