Call this FIRST when you need a capability not in your current tool list. Returns every service accessible through this Clevername gateway — user-registered MCP connections, marketplace servers, and built-in protocols (ARCP, ANCP, SignedApproval). Shows injection mode (always_on or plugin) and cu...
Risk signalsBulk/mass operation — affects multiple targets
Part of the Clevername server.
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AI agents call list_available_mcps to retrieve information from Clevername without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though list_available_mcps only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"list_available_mcps": {}
}
}See the full Clevername policy for all 67 tools.
These attack patterns abuse exactly the kind of access list_available_mcps gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Call this FIRST when you need a capability not in your current tool list. Returns every service accessible through this Clevername gateway — user-registered MCP connections, marketplace servers, and built-in protocols (ARCP, ANCP, SignedApproval). Shows injection mode (always_on or plugin) and current session activation status. After identifying what you need, use activate_mcp({name}) to load its tools into this session.. It is categorised as a Read tool in the Clevername MCP Server, which means it retrieves data without modifying state.
Register the Clevername MCP server in PolicyLayer and add a rule for list_available_mcps: 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 Clevername. Nothing to install.
list_available_mcps 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_mcps 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_mcps. 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_mcps is provided by the Clevername MCP server (@clevername/clevername-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 67 Clevername tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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