AI agents call list_skill_tree to retrieve information from Skill Cortex Lite without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The naming convention and context strongly suggest this is a data retrieval tool that lists or displays the skill tree structure without modifying state. No side effects are indicated. The low severity reflects minimal risk from disclosing a skill inventory structure.
From the tool's definition Tool name 'list_skill_tree' indicates a retrieval operation that enumerates or displays a hierarchical structure of skills.
Documented attack patterns abuse exactly the kind of access list_skill_tree gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Skill Cortex Lite, and nothing reaches the server without passing your rules. This is the rule we recommend for list_skill_tree:
{
"version": "1",
"default": "deny",
"tools": {
"list_skill_tree": {}
}
}list_skill_tree is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list_skill_tree. It is categorised as a Read tool in the Skill Cortex Lite MCP Server, which means it retrieves data without modifying state.
Register the Skill Cortex Lite MCP server in PolicyLayer and add a rule for list_skill_tree: 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 Skill Cortex Lite. Nothing to install.
list_skill_tree 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 list_skill_tree 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 list_skill_tree. 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.
list_skill_tree is provided by the Skill Cortex Lite MCP server (sim-xia/skill-cortex-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Skill Cortex Lite, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 Skill Cortex Lite tools catalogued and risk-classified — across an index of 43,000+ MCP servers.