Get schema information for a specific table
AI agents call postgres_get_table_schema to retrieve information from Gmail & 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 structural information about a database table (columns, types, constraints, etc.) without executing queries, modifying data, or performing destructive operations. It is a read-only metadata inspection operation, analogous to DESCRIBE or INFORMATION_SCHEMA queries. The blast radius of misuse is minimal—an agent could only learn about table structure, not access or alter data.
From the tool's definition Tool name 'postgres_get_table_schema' and description 'Get schema information for a specific table' indicate retrieval of metadata with no modification, deletion, or execution of arbitrary code.
Attacks that exploit this kind of access
Get schema information for a specific table. It is categorised as a Read tool in the Gmail & PostgreSQL MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Gmail & PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for postgres_get_table_schema: 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 Gmail & PostgreSQL MCP Server. Nothing to install.
postgres_get_table_schema 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 postgres_get_table_schema 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 postgres_get_table_schema. 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.
postgres_get_table_schema is provided by the Gmail & PostgreSQL MCP Server MCP server (marouanemkm/gmail-mcp-server). 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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