Clear cached pages matching a URL pattern
AI agents call clear_cache to permanently remove resources in Spider MCP Server — 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 deletion of stored data. While cached pages can theoretically be re-fetched, the act of removing them cannot be undone directly. The blast radius is medium because it affects cached content (not source data), but misuse could force expensive re-crawls or cause data loss if the cache is the only copy of extracted/analyzed content.
From the tool's definition "Clear cached pages" — permanently removes cached data matching a URL pattern
Attacks that exploit this kind of access
Clear cached pages matching a URL pattern. It is categorised as a Destructive tool in the Spider MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Spider MCP Server 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 Spider MCP Server. 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 Spider MCP Server MCP server (oeo/spider-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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