pg_jsonb_delete

Delete a key or array element from a JSONB column. Accepts path as string or array. Note: rowsAffected reflects matched rows, not whether key existed.

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-jsonb-delete.md

WHAT IT DOES

What pg_jsonb_delete does on PostgreSQL MCP Server

AI agents use pg_jsonb_delete 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_jsonb_delete is rated Medium

This tool modifies data within database rows by deleting keys or array elements from a JSONB column. While the word 'delete' appears, this is a partial update to a record's JSONB field (not deleting entire rows), making it a Write operation.

From the tool's definition 'Delete a key or array element from a JSONB column' — this removes specific keys/elements from JSONB data, modifying existing records

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_jsonb_delete 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_jsonb_delete, this is the rule to start with:

pg_jsonb_delete Rate-limited

pg_jsonb_delete 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_jsonb_delete": {
      "limits": [
        {
          "counter": "pg_jsonb_delete_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_jsonb_delete call is checked against it from then on.

FAQ

Questions about pg_jsonb_delete

What does the pg_jsonb_delete tool do? +

Delete a key or array element from a JSONB column. Accepts path as string or array. Note: rowsAffected reflects matched rows, not whether key existed. 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_jsonb_delete? +

Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for pg_jsonb_delete: 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_jsonb_delete? +

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

Can I rate-limit pg_jsonb_delete? +

Yes. Add a rate_limit block to the pg_jsonb_delete 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_jsonb_delete completely? +

Set action: deny in the PolicyLayer policy for pg_jsonb_delete. 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_jsonb_delete? +

pg_jsonb_delete 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_jsonb_delete does on PostgreSQL MCP Server

Why pg_jsonb_delete is rated Medium

The rule that runs pg_jsonb_delete safely

Questions about pg_jsonb_delete

More on PostgreSQL MCP Server, and thousands of servers like it.