AI agents call ocsf_get_versions to retrieve information from Tenzir MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves version information from the Open Cybersecurity Schema Framework. It is a query/read operation that returns data without modifying, deleting, or executing code. The sibling tools in the same namespace all perform schema lookups and metadata retrieval.
From the tool's definition Tool name 'ocsf_get_versions' indicates a retrieval operation that fetches version information from the OCSF schema.
Documented attack patterns abuse exactly the kind of access ocsf_get_versions gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Tenzir MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for ocsf_get_versions:
{
"version": "1",
"default": "deny",
"tools": {
"ocsf_get_versions": {}
}
}ocsf_get_versions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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ocsf_get_versions. It is categorised as a Read tool in the Tenzir MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Tenzir MCP Server MCP server in PolicyLayer and add a rule for ocsf_get_versions: 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 Tenzir MCP Server. Nothing to install.
ocsf_get_versions 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 ocsf_get_versions 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 ocsf_get_versions. 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.
ocsf_get_versions is provided by the Tenzir MCP Server MCP server (tenzir/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Tenzir MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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15 Tenzir MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.