AI agents call tigris_list_buckets to retrieve information from Tigris without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about existing buckets without creating, modifying, deleting, or executing any operations. It is a read-only listing operation with minimal blast radius if misused—an attacker would only gain visibility into bucket names, not access to their contents or ability to modify them.
From the tool's definition Tool name 'tigris_list_buckets' and description 'List all Tigris buckets in your account' indicate a query/enumeration operation with no modification or deletion.
Attacks that exploit this kind of access
List all Tigris buckets in your account. It is categorised as a Read tool in the Tigris MCP Server, which means it retrieves data without modifying state.
Register the Tigris MCP server in PolicyLayer and add a rule for tigris_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 Tigris. Nothing to install.
tigris_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 tigris_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 tigris_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.
tigris_list_buckets is provided by the Tigris MCP server (@tigrisdata/tigris-mcp-server). 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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