wincc-get-tag-values

THE RISK

Low Risk

Why wincc-get-tag-values needs a policy

This tool retrieves current values from SCADA tags, which is a read-only query operation. Even in a critical infrastructure context (SCADA), reading tag values does not modify state, execute commands, or trigger physical actions. The blast radius is minimal—an agent using this tool gains visibility into system state but cannot change configuration, delete data, or cause destructive operations.

From the tool's definition Tool name 'wincc-get-tag-values' and description 'Read runtime values of multiple tags' explicitly indicate data retrieval with no modification or side effects.

Documented attack patterns abuse exactly the kind of access wincc-get-tag-values gives an agent:

POLICY

How to control wincc-get-tag-values

PolicyLayer is an MCP gateway — it sits between your AI agents and WinCC V8 MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for wincc-get-tag-values:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "wincc-get-tag-values": {}
  }
}

wincc-get-tag-values 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 WinCC V8 MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More WinCC V8 MCP Server tools

Execute login-user Logs a user in to WinCC using username and password. Stores the session credentials fo Write wincc-write-tag-value Write a value to a specific tag Write wincc-write-tag-values Write values to multiple tags Read wincc-get-alarm-limit-value Reads limit values for a tag. GET /alarmLogging/LimitValue/{tagName}. Use Accept-Language Read wincc-get-alarm-limit-values Lists limit values. GET /alarmLogging/LimitValues with optional paging (itemLimit, continu Read wincc-get-alarm-message Reads a message. GET /alarmLogging/Message/{messageNumber}. Use Accept-Language for respon Read wincc-get-alarm-message-block Reads a message block. GET /alarmLogging/MessageBlock/{messageBlockName}. Use Accept-Langu Read wincc-get-alarm-message-blocks Lists message blocks. GET /alarmLogging/MessageBlocks with optional paging (itemLimit, con

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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 wincc-get-tag-values

What does the wincc-get-tag-values tool do? +

Read runtime values of multiple tags. It is categorised as a Read tool in the WinCC V8 MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on wincc-get-tag-values? +

Register the WinCC V8 MCP Server MCP server in PolicyLayer and add a rule for wincc-get-tag-values: 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 WinCC V8 MCP Server. Nothing to install.

What risk level is wincc-get-tag-values? +

wincc-get-tag-values is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit wincc-get-tag-values? +

Yes. Add a rate_limit block to the wincc-get-tag-values 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 wincc-get-tag-values completely? +

Set action: deny in the PolicyLayer policy for wincc-get-tag-values. 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 wincc-get-tag-values? +

wincc-get-tag-values is provided by the WinCC V8 MCP Server MCP server (vogler75/winccv8-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every WinCC V8 MCP Server tool call.

Start from WinCC V8 MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →