Clear all memory items, optionally within a specific bucket.
AI agents call clear to permanently remove resources in Arca MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes data from the vector memory storage without explicit per-item confirmation. While the impact is limited to a single MCP server's memory store (not production databases or financial systems), the irreversible nature of clearing 'all' items in a bucket qualifies it as Destructive rather than Write. An agent misconfigured to call this tool could lose significant stored context or user data.
From the tool's definition Tool name 'clear' combined with description 'Clear all memory items' indicates irreversible deletion of potentially large amounts of data. The phrase 'all memory items' suggests bulk deletion without granular recovery options.
Attacks that exploit this kind of access
Clear all memory items, optionally within a specific bucket. It is categorised as a Destructive tool in the Arca MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Arca MCP server in PolicyLayer and add a rule for clear: 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 Arca MCP. Nothing to install.
clear 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 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. 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 is provided by the Arca MCP server (m0nochr0me/arca-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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