AI agents call version to retrieve information from Things without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
A 'version' tool typically retrieves version information about the application or server, which is a read-only operation with no side effects. However, since the description is empty, confidence is low. Given the context of a Things MCP server focused on todo management, it most likely returns version metadata.
From the tool's definition Tool name is 'version'; description is empty and uninformative.
Documented attack patterns abuse exactly the kind of access version gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Things, and nothing reaches the server without passing your rules. This is the rule we recommend for version:
{
"version": "1",
"default": "deny",
"tools": {
"version": {}
}
}version is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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version. It is categorised as a Read tool in the Things MCP Server, which means it retrieves data without modifying state.
Register the Things MCP server in PolicyLayer and add a rule for version: 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 Things. Nothing to install.
version is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the version 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 version. 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.
version is provided by the Things MCP server (jimfilippou/things-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Things, 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 Things tools catalogued and risk-classified — across an index of 43,000+ MCP servers.