available_instances_tool
AI agents call available_instances_tool to retrieve information from Qiskit Gym MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to query or list available instances without modifying, deleting, or executing operations. Despite the empty description lowering confidence, the naming convention and context among information-retrieval sibling tools strongly indicate a Read operation. No side effects, financial impact, or destructive capability is evident.
From the tool's definition Tool name is 'available_instances_tool' with no description provided. The naming pattern (verb 'available' + noun 'instances') and sibling tools like 'active_instance_info_tool' and 'active_account_info_tool' suggest this retrieves information about available…
Attacks that exploit this kind of access
available_instances_tool. It is categorised as a Read tool in the Qiskit Gym MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Qiskit Gym MCP Server MCP server in PolicyLayer and add a rule for available_instances_tool: 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 Qiskit Gym MCP Server. Nothing to install.
available_instances_tool 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 available_instances_tool 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 available_instances_tool. 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.
available_instances_tool is provided by the Qiskit Gym MCP Server MCP server (qiskit-gym-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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