list_opportunities_by_stage

THE RISK

Low Risk

Why list_opportunities_by_stage needs a policy

This tool retrieves and displays opportunities organized by sales stage for visibility purposes. It queries data without creating, modifying, deleting, or executing actions. There are no side effects or irreversible operations. The blast radius of misuse is minimal—an AI agent could only over-retrieve information, not alter business-critical data.

From the tool's definition Tool name 'list_opportunities_by_stage' and description 'List all opportunities grouped by their sales stage (pipeline view)' indicate retrieval of existing data without modification. The verb 'list' and the phrase 'view' confirm read-only semantics.

Documented attack patterns abuse exactly the kind of access list_opportunities_by_stage gives an agent:

POLICY

How to control list_opportunities_by_stage

PolicyLayer is an MCP gateway — it sits between your AI agents and Twenty MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_opportunities_by_stage:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_opportunities_by_stage": {}
  }
}

list_opportunities_by_stage is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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Add this policy — paste it, or build it visually.
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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_opportunities_by_stage

What does the list_opportunities_by_stage tool do? +

List all opportunities grouped by their sales stage (pipeline view). It is categorised as a Read tool in the Twenty MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_opportunities_by_stage? +

Register the Twenty MCP Server MCP server in PolicyLayer and add a rule for list_opportunities_by_stage: 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 Twenty MCP Server. Nothing to install.

What risk level is list_opportunities_by_stage? +

list_opportunities_by_stage is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_opportunities_by_stage? +

Yes. Add a rate_limit block to the list_opportunities_by_stage 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 list_opportunities_by_stage completely? +

Set action: deny in the PolicyLayer policy for list_opportunities_by_stage. 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 list_opportunities_by_stage? +

list_opportunities_by_stage is provided by the Twenty MCP Server MCP server (jezweb/twenty-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Twenty MCP Server tool call.

Start from Twenty MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →