pg_pgcrypto_hmac

Compute HMAC for data with a secret key.

SERVERPostgreSQL MCP Server SOURCE@neverinfamous/postgres-mcp

High RISK CLASS

Category Execute

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-pgcrypto-hmac.md

WHAT IT DOES

What pg_pgcrypto_hmac does on PostgreSQL MCP Server

AI agents invoke pg_pgcrypto_hmac to trigger actions in PostgreSQL MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why pg_pgcrypto_hmac is rated High

This tool executes a cryptographic HMAC computation against the PostgreSQL pgcrypto extension. It runs a database function with potentially sensitive secret key material. While it doesn't directly modify or delete data, it executes an operation (cryptographic function invocation) with side-effect potential depending on how results are used.

From the tool's definition 'Compute HMAC for data with a secret key' — performs a cryptographic computation operation using secret key material

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_pgcrypto_hmac 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_pgcrypto_hmac, this is the rule to start with:

pg_pgcrypto_hmac Rate-limited

pg_pgcrypto_hmac stays usable, but rate-capped: a runaway agent can't fire it dozens of times 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_pgcrypto_hmac": {
      "limits": [
        {
          "counter": "pg_pgcrypto_hmac_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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_pgcrypto_hmac call is checked against it from then on.

FAQ

Questions about pg_pgcrypto_hmac

What does the pg_pgcrypto_hmac tool do? +

Compute HMAC for data with a secret key. It is categorised as a Execute tool in the PostgreSQL MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on pg_pgcrypto_hmac? +

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

pg_pgcrypto_hmac is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit pg_pgcrypto_hmac? +

Yes. Add a rate_limit block to the pg_pgcrypto_hmac 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_pgcrypto_hmac completely? +

Set action: deny in the PolicyLayer policy for pg_pgcrypto_hmac. 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_pgcrypto_hmac? +

pg_pgcrypto_hmac 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_pgcrypto_hmac does on PostgreSQL MCP Server

Why pg_pgcrypto_hmac is rated High

The rule that runs pg_pgcrypto_hmac safely

Questions about pg_pgcrypto_hmac

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