AI agents use create_pou to create or update resources in CODESYS MCP Toolkit — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your CODESYS MCP Toolkit environment.
The tool creates new POU objects in CODESYS projects, which are reversible modifications to project data. While the description is empty, the name and context with sibling write/automation tools confirm this is a creation/modification action rather than read-only or destructive.
From the tool's definition Tool name 'create_pou' with sibling tools including 'create_project', 'create_method', 'create_property', 'save_project', and 'compile_project' in a CODESYS programming environment automation context indicates data creation/modification capabilities.
Documented attack patterns abuse exactly the kind of access create_pou gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CODESYS MCP Toolkit, and nothing reaches the server without passing your rules. This is the rule we recommend for create_pou:
{
"version": "1",
"default": "deny",
"tools": {
"create_pou": {
"limits": [
{
"counter": "create_pou_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_pou 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.
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create_pou. It is categorised as a Write tool in the CODESYS MCP Toolkit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the CODESYS MCP Toolkit MCP server in PolicyLayer and add a rule for create_pou: 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 CODESYS MCP Toolkit. Nothing to install.
create_pou is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_pou 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.
Set action: deny in the PolicyLayer policy for create_pou. 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.
create_pou is provided by the CODESYS MCP Toolkit MCP server (johannespettersson80/codesys-mcp-toolkit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CODESYS MCP Toolkit, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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8 CODESYS MCP Toolkit tools catalogued and risk-classified — across an index of 43,000+ MCP servers.