Column schema for a table. Accepts bare or schema.table identifiers (e.g. dbo.Users).
AI agents call describe_table to retrieve information from Mssql Mcp Node without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
dbKey | string | — | Database key (lowercased). Optional in single-database mode. Call `list_databases` to discover valid keys. |
table | string | Yes |
Parameters from the server's own tool schema.
This tool retrieves metadata about table structure (column definitions) without side effects. It is a read-only introspection operation analogous to querying the information schema. No data is modified, deleted, or executed.
From the tool's definition Tool description explicitly states it retrieves 'Column schema for a table' with no indication of modification or execution. The name 'describe_table' and the parameter format (`schema.table` identifiers) are consistent with introspection/query operations.
Attacks that exploit this kind of access
Column schema for a table. Accepts bare or schema.table identifiers (e.g. dbo.Users). It is categorised as a Read tool in the Mssql Mcp Node MCP Server, which means it retrieves data without modifying state.
describe_table accepts 2 parameters: dbKey, table. Required: table. The full parameter table on this page comes from the server's own tool schema.
Register the Mssql Mcp Node 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 Mssql Mcp Node. 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 Mssql Mcp Node MCP server (mssql-mcp-node). 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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