AI agents call skill_info to retrieve information from Musubix without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and displays metadata about skills—parameter definitions, tags, and usage examples. It performs read-only retrieval operations with no capability to modify, execute, delete, or commit financial actions. The low severity reflects minimal risk even if accessed by an unauthorized agent, as it only exposes informational content.
From the tool's definition Tool name 'skill_info' and description stating it 'retrieves detailed information' (スキルの詳細情報を取得します) about skills, parameters, tags, and usage examples. The verb 'get' (取得) indicates data retrieval with no modification or side effects.
Attacks that exploit this kind of access
スキルの詳細情報を取得します。 パラメータ定義、タグ、使用例などの詳細を表示します。. It is categorised as a Read tool in the Musubix MCP Server, which means it retrieves data without modifying state.
Register the Musubix MCP server in PolicyLayer and add a rule for skill_info: 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 Musubix. Nothing to install.
skill_info 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_info 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_info. 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_info is provided by the Musubix MCP server (@nahisaho/musubix-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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