Update rows in a table matching a WHERE condition. Provide column-value pairs to set and a WHERE clause. Uses parameterized queries for safety. The WHERE clause parameters start after the SET parameters.
AI agents use updateRows to create or update resources in Postgresql — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Postgresql environment.
updateRows modifies existing data in a database table based on provided conditions. This is a Write operation because it creates or modifies data reversibly (updates can be rolled back or re-executed). It is not Destructive because updates are not irreversible like deletions.
From the tool's definition Tool description states 'Update rows in a table matching a WHERE condition' and 'Provide column-value pairs to set' — these are classic write operations that modify data reversibly.
Attacks that exploit this kind of access
Update rows in a table matching a WHERE condition. Provide column-value pairs to set and a WHERE clause. Uses parameterized queries for safety. The WHERE clause parameters start after the SET parameters. It is categorised as a Write tool in the Postgresql MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Postgresql MCP server in PolicyLayer and add a rule for updateRows: 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. Nothing to install.
updateRows is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the updateRows 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 updateRows. 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.
updateRows is provided by the Postgresql MCP server (vnikhilbuddhavarapu/postgresql-mcp). 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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