List all available agent skills (best-practice guides).
AI agents call skill_list to retrieve information from HoloViz MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple informational lookup operation (list/query) with no side effects, no code execution, no data modification, and no destructive capabilities. It returns reference information about available skills, which is purely a Read operation. The low severity reflects minimal blast radius — even if an AI agent misuses this tool, it can only retrieve information without affecting any systems or data.
From the tool's definition Tool name 'skill_list' and description 'List all available agent skills' indicate a retrieval operation that queries available skills without modifying, executing, or deleting anything.
Attacks that exploit this kind of access
List all available agent skills (best-practice guides). It is categorised as a Read tool in the HoloViz MCP Server MCP Server, which means it retrieves data without modifying state.
Register the HoloViz MCP Server MCP server in PolicyLayer and add a rule for skill_list: 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 HoloViz MCP Server. Nothing to install.
skill_list 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 skill_list 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 skill_list. 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.
skill_list is provided by the HoloViz MCP Server MCP server (sumayabee/holoviz-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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