refresh_database · Jlcpcb Search MCP: Risk & Policy

WHAT IT DOES

What refresh_database does on Jlcpcb Search

AI agents use refresh_database to create or update resources in Jlcpcb Search — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Jlcpcb Search environment.

WHY IT NEEDS A POLICY

Why refresh_database needs a policy

This tool updates the local component database with fresh data from JLCPCB. It modifies the database contents by overwriting or inserting new records, which is a Write operation. It does not delete data irreversibly (it refreshes/updates), does not execute arbitrary code, and has no financial implications.

From the tool's definition Refresh/update the component database to get the latest parts from JLCPCB

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

refresh_database Rate-limited

refresh_database 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": {
    "refresh_database": {
      "limits": [
        {
          "counter": "refresh_database_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Jlcpcb Search, so you can run agents against it safely.

FAQ

Questions about refresh_database

What does the refresh_database tool do? +

Refresh/update the component database to get the latest parts from JLCPCB. It is categorised as a Write tool in the Jlcpcb Search MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on refresh_database? +

Register the Jlcpcb Search MCP server in PolicyLayer and add a rule for refresh_database: 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 Jlcpcb Search. Nothing to install.

What risk level is refresh_database? +

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

Can I rate-limit refresh_database? +

Yes. Add a rate_limit block to the refresh_database 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 refresh_database completely? +

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

refresh_database is provided by the Jlcpcb Search MCP server (peterb154/jlcpcb-search-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.