pass__list_items

THE RISK

Low Risk

Why pass__list_items needs a policy

This tool retrieves/lists data (credential names) from a vault without side effects or modification. It is classified as Read rather than low severity because the vault metadata (credential names/structure) can reveal information about an organization's security practices and online services, making it moderately sensitive in an unauthorized disclosure scenario.

From the tool's definition Tool description explicitly states "List credential names in a Proton Pass vault (no passwords returned)" - this is a retrieval operation that queries vault contents without returning sensitive secrets.

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

POLICY

How to control pass__list_items

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

policy.json

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

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

Create a free account and register Proton-MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

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 pass__list_items

What does the pass__list_items tool do? +

List credential names in a Proton Pass vault (no passwords returned). It is categorised as a Read tool in the Proton-MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on pass__list_items? +

Register the Proton- MCP server in PolicyLayer and add a rule for pass__list_items: 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 Proton-MCP. Nothing to install.

What risk level is pass__list_items? +

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

Can I rate-limit pass__list_items? +

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

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

pass__list_items is provided by the Proton- MCP server (jorgenclaw/proton-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Proton-MCP tool call.

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

CHECK YOUR STACK →