Get basin-level metrics. metric_set: 'storage', 'append-ops', 'read-ops', 'read-throughput', 'append-throughput', or 'basin-ops'.
AI agents call basin_metrics 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 performs a read-only operation that queries and returns metrics data about a basin. It has no capability to modify, delete, execute code, or affect financial systems. The blast radius of misuse is minimal—an agent could only retrieve operational metrics that are typically non-sensitive aggregate data.
From the tool's definition Tool name 'basin_metrics' and description 'Get basin-level metrics' indicates retrieval of monitoring/analytics data with no modification or side effects.
Attacks that exploit this kind of access
Get basin-level metrics. metric_set: 'storage', 'append-ops', 'read-ops', 'read-throughput', 'append-throughput', or 'basin-ops'. 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 basin_metrics: 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.
basin_metrics 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 basin_metrics 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 basin_metrics. 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.
basin_metrics 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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