list_credentials

THE RISK

Low Risk

Why list_credentials needs a policy

This tool retrieves credential metadata without modification or deletion. While exposure of credential metadata (usernames, service names, creation dates) could be sensitive in an enterprise context and enable social engineering or targeted attacks, the tool itself performs only a read operation.

From the tool's definition Tool name 'list_credentials' and description state it 'List[s] all stored credentials' and 'Returns metadata only - no passwords or API keys are exposed.' This is a query/retrieval operation with no side effects.

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

POLICY

How to control list_credentials

PolicyLayer is an MCP gateway — it sits between your AI agents and Chrome MCP Server (Security Hardened), and nothing reaches the server without passing your rules. This is the rule we recommend for list_credentials:

policy.json

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

list_credentials 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 Chrome MCP Server (Security Hardened) — 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

Related tools and policies

More Chrome MCP Server (Security Hardened) tools

Destructive delete_credential Permanently delete a stored credential. Execute secure_login Perform a secure login using stored credentials. Automatically fills in username/email and Write store_credential Securely store login credentials with post-quantum encryption. Credentials are encrypted a Write update_credential Update an existing credential. Only provided fields will be updated. Read get_credential Get a specific credential by ID. Returns metadata only - use secure_login for authenticati Read get_vault_status Get the status of the credential vault including encryption configuration.

All 7 Chrome MCP Server (Security Hardened) tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

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_credentials

What does the list_credentials tool do? +

List all stored credentials. Returns metadata only - no passwords or API keys are exposed. It is categorised as a Read tool in the Chrome MCP Server (Security Hardened) MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_credentials? +

Register the Chrome MCP Server (Security Hardened) MCP server in PolicyLayer and add a rule for list_credentials: 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 Chrome MCP Server (Security Hardened). Nothing to install.

What risk level is list_credentials? +

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

Can I rate-limit list_credentials? +

Yes. Add a rate_limit block to the list_credentials 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_credentials completely? +

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

list_credentials is provided by the Chrome MCP Server (Security Hardened) MCP server (pantheon-security/chrome-mcp-secure). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Chrome MCP Server (Security Hardened) tool call.

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

CHECK YOUR STACK →