clear_cache
AI agents call clear_cache to permanently remove resources in Coin — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Clearing a cache is an irreversible operation that destroys stored data. While the blast radius is limited (cache can be rebuilt from source data), the action cannot be undone. The empty description lowers confidence, but the name strongly implies destructive behavior. Severity is medium because cache loss causes performance degradation but not permanent data loss.
From the tool's definition Tool name 'clear_cache' implies irreversible deletion of cached data. Description is empty, providing no additional context.
Attacks that exploit this kind of access
clear_cache. It is categorised as a Destructive tool in the Coin MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Coin MCP server in PolicyLayer and add a rule for clear_cache: 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 Coin. Nothing to install.
clear_cache is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the clear_cache 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 clear_cache. 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.
clear_cache is provided by the Coin MCP server (sweetcornna/coin-mcp). 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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