pg_vector_add_column

Add a vector column to a table. Requires: table, column, dimensions.

SERVERPostgreSQL MCP Server SOURCE@neverinfamous/postgres-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-neverinfamous-postgres-mcp/pg-vector-add-column.md

WHAT IT DOES

What pg_vector_add_column does on PostgreSQL MCP Server

AI agents use pg_vector_add_column to create or update resources in PostgreSQL MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your PostgreSQL MCP Server environment.

RISK

Why pg_vector_add_column is rated Medium

This tool creates a new column in an existing table, which is a schema modification. This is reversible (the column can be dropped), so it falls under Write rather than Destructive. The blast radius is medium because it modifies table schema which could affect application queries or cause unexpected behavior if the wrong dimensions are specified, but the operation itself is not destructive or irreversible.

From the tool's definition Tool description states 'Add a vector column to a table', which is a CREATE/ADD operation that modifies table schema reversibly.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_vector_add_column safely

PolicyLayer is an MCP gateway: it sits between your AI agents and PostgreSQL MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For pg_vector_add_column, this is the rule to start with:

pg_vector_add_column Rate-limited

pg_vector_add_column stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pg_vector_add_column": {
      "limits": [
        {
          "counter": "pg_vector_add_column_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect PostgreSQL MCP Server, apply this rule, and every pg_vector_add_column call is checked against it from then on.

FAQ

Questions about pg_vector_add_column

What does the pg_vector_add_column tool do? +

Add a vector column to a table. Requires: table, column, dimensions. It is categorised as a Write tool in the PostgreSQL MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pg_vector_add_column? +

Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for pg_vector_add_column: 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 MCP Server. Nothing to install.

What risk level is pg_vector_add_column? +

pg_vector_add_column is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit pg_vector_add_column? +

Yes. Add a rate_limit block to the pg_vector_add_column 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.

How do I block pg_vector_add_column completely? +

Set action: deny in the PolicyLayer policy for pg_vector_add_column. 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.

What MCP server provides pg_vector_add_column? +

pg_vector_add_column is provided by the PostgreSQL MCP Server MCP server (@neverinfamous/postgres-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

What pg_vector_add_column does on PostgreSQL MCP Server

Why pg_vector_add_column is rated Medium

The rule that runs pg_vector_add_column safely

Questions about pg_vector_add_column

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