List basins in the account. Optionally filter by prefix.
AI agents call list_basins to retrieve information from S2 StreamStore MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or lists existing basins from the account without creating, modifying, deleting, or executing anything. It is a pure read operation that queries account state and returns results. The low severity reflects minimal blast radius—unauthorized listing of basins could expose metadata, but does not enable data modification, deletion, or financial harm.
From the tool's definition Tool name 'list_basins' and description 'List basins in the account' indicate data retrieval with no side effects. The optional prefix filter is a query parameter for filtering results, not a modification or execution action.
Attacks that exploit this kind of access
List basins in the account. Optionally filter by prefix. It is categorised as a Read tool in the S2 StreamStore MCP Server MCP Server, which means it retrieves data without modifying state.
Register the S2 StreamStore MCP Server MCP server in PolicyLayer and add a rule for list_basins: 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 S2 StreamStore MCP Server. Nothing to install.
list_basins 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_basins 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_basins. 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_basins is provided by the S2 StreamStore MCP Server MCP server (s2-streamstore/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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