update_credential | PolicyLayer

WHAT IT DOES

What update_credential does on Chrome MCP Server (Security Hardened)

AI agents use update_credential to create or update resources in Chrome MCP Server (Security Hardened) — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Chrome MCP Server (Security Hardened) environment.

THE RISK

Medium Risk

Why update_credential needs a policy

This tool modifies existing credential data reversibly. While credentials are sensitive, the operation is not destructive (the old value is overwritten, not irreversibly deleted) and does not execute code or move money. However, the high severity reflects that modifying credentials could enable privilege escalation, account takeover, or lateral movement if misused by an AI agent.

From the tool's definition Tool name 'update_credential' and description 'Update an existing credential. Only provided fields will be updated.' directly indicate modification of stored credentials.

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

POLICY

How to control update_credential

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 update_credential:

policy.json

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

update_credential 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.

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.

LIMIT THIS TOOL →

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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 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. Read list_credentials List all stored credentials. Returns metadata only - no passwords or API keys are exposed.

All 7 Chrome MCP Server (Security Hardened) tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about update_credential

What does the update_credential tool do? +

Update an existing credential. Only provided fields will be updated. It is categorised as a Write tool in the Chrome MCP Server (Security Hardened) MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_credential? +

Register the Chrome MCP Server (Security Hardened) MCP server in PolicyLayer and add a rule for update_credential: 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 update_credential? +

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

Can I rate-limit update_credential? +

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

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

update_credential 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.

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7 Chrome MCP Server (Security Hardened) tools catalogued and risk-classified — across an index of 43,000+ MCP servers.