add_cel_expression_to_metrics

Add CEL expressions to an existing metric.

SERVERComplianceCow MCP Server SOURCEcompliancecow/cow-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/compliancecow-cow-mcp/add-cel-expression-to-metrics.md

WHAT IT DOES

What add_cel_expression_to_metrics does on ComplianceCow MCP Server

AI agents use add_cel_expression_to_metrics to create or update resources in ComplianceCow MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ComplianceCow MCP Server environment.

RISK

Why add_cel_expression_to_metrics is rated Medium

This tool modifies metrics by adding CEL (Common Expression Language) expressions to them. While it doesn't delete data (Destructive) or move money (Financial), it does persistently change metric configurations which could affect compliance assessments and dashboards.

From the tool's definition The tool name and description indicate it 'Add[s] CEL expressions to an existing metric' — a modification operation that creates or updates metric configurations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_cel_expression_to_metrics safely

PolicyLayer is an MCP gateway: it sits between your AI agents and ComplianceCow MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For add_cel_expression_to_metrics, this is the rule to start with:

add_cel_expression_to_metrics Rate-limited

add_cel_expression_to_metrics stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_cel_expression_to_metrics": {
      "limits": [
        {
          "counter": "add_cel_expression_to_metrics_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect ComplianceCow MCP Server, apply this rule, and every add_cel_expression_to_metrics call is checked against it from then on.

FAQ

Questions about add_cel_expression_to_metrics

What does the add_cel_expression_to_metrics tool do? +

Add CEL expressions to an existing metric. It is categorised as a Write tool in the ComplianceCow MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_cel_expression_to_metrics? +

Register the ComplianceCow MCP Server MCP server in PolicyLayer and add a rule for add_cel_expression_to_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 ComplianceCow MCP Server. Nothing to install.

What risk level is add_cel_expression_to_metrics? +

add_cel_expression_to_metrics is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit add_cel_expression_to_metrics? +

Yes. Add a rate_limit block to the add_cel_expression_to_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.

How do I block add_cel_expression_to_metrics completely? +

Set action: deny in the PolicyLayer policy for add_cel_expression_to_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.

What MCP server provides add_cel_expression_to_metrics? +

add_cel_expression_to_metrics is provided by the ComplianceCow MCP Server MCP server (compliancecow/cow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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