List available tools with name and summary.
AI agents call list-available-tools to retrieve information from Nimble without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation—it retrieves and lists metadata about tools. There are no side effects, no code execution, no data modification, and no destructive operations. It is purely informational, making it a Read category risk with low severity.
From the tool's definition Tool name 'list-available-tools' and description 'List available tools with name and summary' indicate a retrieval operation that queries and returns information about available tools without modifying or executing anything.
Documented attack patterns abuse exactly the kind of access list-available-tools gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Nimble, and nothing reaches the server without passing your rules. This is the rule we recommend for list-available-tools:
{
"version": "1",
"default": "deny",
"tools": {
"list-available-tools": {}
}
}list-available-tools is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List available tools with name and summary. It is categorised as a Read tool in the Nimble MCP Server, which means it retrieves data without modifying state.
Register the Nimble MCP server in PolicyLayer and add a rule for list-available-tools: 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 Nimble. Nothing to install.
list-available-tools 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-available-tools 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-available-tools. 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-available-tools is provided by the Nimble MCP server (mquan/nimble). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Nimble, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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3 Nimble tools catalogued and risk-classified — across an index of 43,000+ MCP servers.