Read local snapshot JSONL and return 1d/7d/30d deltas plus sparklines for velocity, riskScore, wipTotal, leadTimeP50Hours.
AI agents call ralph_hero__metrics_trends to retrieve information from Ralph Hero without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and analyzes local snapshot data to generate trend metrics and visualizations. It performs no writes, deletes, executions of external code, or financial operations. The most severe action is reading existing JSONL data and computing statistics, which is a pure Read operation with minimal risk if misused by an AI agent.
From the tool's definition Tool description states 'Read local snapshot JSONL and return...' – the verb 'Read' and 'return' indicate data retrieval with no modification. It computes and returns aggregate metrics (deltas, sparklines) from existing snapshots.
Attacks that exploit this kind of access
Read local snapshot JSONL and return 1d/7d/30d deltas plus sparklines for velocity, riskScore, wipTotal, leadTimeP50Hours. It is categorised as a Read tool in the Ralph Hero MCP Server, which means it retrieves data without modifying state.
Register the Ralph Hero MCP server in PolicyLayer and add a rule for ralph_hero__metrics_trends: 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 Ralph Hero. Nothing to install.
ralph_hero__metrics_trends 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 ralph_hero__metrics_trends 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 ralph_hero__metrics_trends. 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.
ralph_hero__metrics_trends is provided by the Ralph Hero MCP server (ralph-hero-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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