针对指标主题，查询指定时间范围内指标的变化趋势（范围查询）。使用 PromQL 语法对指标主题中的数据进行时序查询，返回区间内的时序数据。 step 参数建议：根据查询时间范围合理设置数据点密度 - 1 小时内：step=60（每分钟） - 1 天内：step=300（每 5 分钟） - 1 周内：step=3600（每小时） - 1 月内：step=86400（每天）
Risk signalsAccepts freeform code/query input (Query)
Part of the Cls server.
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AI agents call QueryRangeMetric to retrieve information from Cls without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though QueryRangeMetric only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"QueryRangeMetric": {}
}
}See the full Cls policy for all 19 tools.
These attack patterns abuse exactly the kind of access QueryRangeMetric gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
针对指标主题，查询指定时间范围内指标的变化趋势（范围查询）。使用 PromQL 语法对指标主题中的数据进行时序查询，返回区间内的时序数据。 step 参数建议：根据查询时间范围合理设置数据点密度 - 1 小时内：step=60（每分钟） - 1 天内：step=300（每 5 分钟） - 1 周内：step=3600（每小时） - 1 月内：step=86400（每天）. It is categorised as a Read tool in the Cls MCP Server, which means it retrieves data without modifying state.
Register the Cls MCP server in PolicyLayer and add a rule for QueryRangeMetric: 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 Cls. Nothing to install.
QueryRangeMetric 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 QueryRangeMetric 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 QueryRangeMetric. 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.
QueryRangeMetric is provided by the Cls MCP server (cls-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 Cls tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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