AI agents call list_buckets to retrieve information from Recall MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns a list of existing buckets without altering, creating, or removing any data. It is a read-only operation with minimal security risk—the worst outcome of misuse would be information disclosure of bucket names, which is low severity.
From the tool's definition Tool name 'list_buckets' and description 'List all buckets in Recall' indicate a retrieval operation with no modification, deletion, or side effects.
Documented attack patterns abuse exactly the kind of access list_buckets gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Recall MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_buckets:
{
"version": "1",
"default": "deny",
"tools": {
"list_buckets": {}
}
}list_buckets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all buckets in Recall. It is categorised as a Read tool in the Recall MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Recall MCP Server MCP server in PolicyLayer and add a rule for list_buckets: 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 Recall MCP Server. Nothing to install.
list_buckets 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_buckets 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_buckets. 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_buckets is provided by the Recall MCP Server MCP server (recallnet/recall-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Recall MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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9 Recall MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.