AI agents call xctrace_list to retrieve information from Xctools without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves and lists information about available devices, templates, or instruments. It performs no modifications, does not execute code, and has no destructive or financial implications. The 'list' operation is inherently a read-only query operation with minimal blast radius if misused by an agent.
From the tool's definition The tool name 'xctrace_list' and description 'List available devices, templates, or instruments' indicate a retrieval operation that queries and displays information without modification or side effects.
Attacks that exploit this kind of access
List available devices, templates, or instruments. It is categorised as a Read tool in the Xctools MCP Server, which means it retrieves data without modifying state.
Register the Xctools MCP server in PolicyLayer and add a rule for xctrace_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 Xctools. Nothing to install.
xctrace_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 xctrace_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 xctrace_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.
xctrace_list is provided by the Xctools MCP server (nzrsky/xctools-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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