Project-ReadLanguages

THE RISK

Low Risk

Why Project-ReadLanguages needs a policy

This tool retrieves metadata about available project languages from a PLC controller. It performs a read-only query that returns information without modifying state, executing commands, or affecting system operations. The blast radius of misuse is minimal, as an attacker gains only informational insight into the PLC configuration.

From the tool's definition Tool name contains 'Read' and description states 'returns a list with the project languages available on the CPU' — a query operation with no side effects.

Documented attack patterns abuse exactly the kind of access Project-ReadLanguages gives an agent:

POLICY

How to control Project-ReadLanguages

PolicyLayer is an MCP gateway — it sits between your AI agents and ThinkPLC-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for Project-ReadLanguages:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "Project-ReadLanguages": {}
  }
}

Project-ReadLanguages is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register ThinkPLC-MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about Project-ReadLanguages

What does the Project-ReadLanguages tool do? +

This API method returns a list with the project languages available on the CPU. You can then use the. It is categorised as a Read tool in the ThinkPLC-MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on Project-ReadLanguages? +

Register the ThinkPLC- MCP server in PolicyLayer and add a rule for Project-ReadLanguages: 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 ThinkPLC-MCP. Nothing to install.

What risk level is Project-ReadLanguages? +

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

Can I rate-limit Project-ReadLanguages? +

Yes. Add a rate_limit block to the Project-ReadLanguages 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 Project-ReadLanguages completely? +

Set action: deny in the PolicyLayer policy for Project-ReadLanguages. 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 Project-ReadLanguages? +

Project-ReadLanguages is provided by the ThinkPLC- MCP server (mrwan84/thinkplc-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every ThinkPLC-MCP tool call.

Start from ThinkPLC-MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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