pg_ltree_subpath

Extract a portion of an ltree path.

SERVERPostgreSQL MCP Server SOURCE@neverinfamous/postgres-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-neverinfamous-postgres-mcp/pg-ltree-subpath.md

WHAT IT DOES

What pg_ltree_subpath does on PostgreSQL MCP Server

AI agents call pg_ltree_subpath to retrieve information from PostgreSQL MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why pg_ltree_subpath is rated Low

This tool extracts or retrieves a substring portion from an existing ltree path value. It performs a read-only operation on data without creating, modifying, deleting, or executing external actions. The blast radius of misuse is minimal—it only returns computed subsets of hierarchical path data that already exists.

From the tool's definition Tool name 'pg_ltree_subpath' and description 'Extract a portion of an ltree path' indicate a data retrieval operation on PostgreSQL's ltree (labeled tree) data type. The verb 'extract' denotes reading/querying without modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_ltree_subpath 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_ltree_subpath, this is the rule to start with:

pg_ltree_subpath Allowed

pg_ltree_subpath is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pg_ltree_subpath": {}
  }
}

ALLOW ONLY 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_ltree_subpath call is checked against it from then on.

FAQ

Questions about pg_ltree_subpath

What does the pg_ltree_subpath tool do? +

Extract a portion of an ltree path. It is categorised as a Read tool in the PostgreSQL MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on pg_ltree_subpath? +

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

pg_ltree_subpath is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit pg_ltree_subpath? +

Yes. Add a rate_limit block to the pg_ltree_subpath 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_ltree_subpath completely? +

Set action: deny in the PolicyLayer policy for pg_ltree_subpath. 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_ltree_subpath? +

pg_ltree_subpath 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_ltree_subpath does on PostgreSQL MCP Server

Why pg_ltree_subpath is rated Low

The rule that runs pg_ltree_subpath safely

Questions about pg_ltree_subpath

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