获取 CLS 日志直方图数据。查询指定日志主题在指定时间范围内的日志分布直方图，统计各时间段内匹配查询条件的日志数量。 重要：本工具仅返回时间（BTime）和计数（Count）两个维度，无法做多字段聚合分析。 - 如果日志主题支持 SQL 分析（标准存储），应优先使用 SearchLog 工具通过管道符 | 进行时间分组统计，功能更强大 - 本工具适用于不支持 SQL 分析的日志主题（如低频存储主题），或只需快速查看日志量时间趋势的场景 Query 参数使用 CQL 语法，建议先使用 TextToSearchLogQuery 生成。 返回信息包含：Interval（时间间隔）、Total...
Risk signalsAccepts freeform code/query input (Query)
Part of the Cls server.
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AI agents call DescribeLogHistogram 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 DescribeLogHistogram 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": {
"DescribeLogHistogram": {}
}
}See the full Cls policy for all 19 tools.
These attack patterns abuse exactly the kind of access DescribeLogHistogram 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.
获取 CLS 日志直方图数据。查询指定日志主题在指定时间范围内的日志分布直方图，统计各时间段内匹配查询条件的日志数量。 重要：本工具仅返回时间（BTime）和计数（Count）两个维度，无法做多字段聚合分析。 - 如果日志主题支持 SQL 分析（标准存储），应优先使用 SearchLog 工具通过管道符 | 进行时间分组统计，功能更强大 - 本工具适用于不支持 SQL 分析的日志主题（如低频存储主题），或只需快速查看日志量时间趋势的场景 Query 参数使用 CQL 语法，建议先使用 TextToSearchLogQuery 生成。 返回信息包含：Interval（时间间隔）、TotalCount（总日志条数）、HistogramInfos（各时间段的 BTime 起始时间和 Count 日志计数）。. 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 DescribeLogHistogram: 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.
DescribeLogHistogram 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 DescribeLogHistogram 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 DescribeLogHistogram. 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.
DescribeLogHistogram 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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