update_contact

A write tool on the MCP Google Contacts MCP server.

SERVERMCP Google Contacts Server SOURCE4tal/mcp-google-contacts

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/4tal-mcp-google-contacts/update-contact.md

WHAT IT DOES

What update_contact does on MCP Google Contacts Server

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

RISK

Why update_contact is rated Medium

This tool modifies existing contact data but does not delete or irreversibly destroy information. Updates can be reverted by subsequent modifications, classifying it as Write rather than Destructive. Severity is medium because a compromised AI agent could modify many contacts, potentially disrupting personal or business communications, but changes are not permanent or irreversible.

From the tool's definition Tool name 'update_contact' and server context describing 'updating contacts' indicate data modification. The server provides 'comprehensive Google Contacts management including creating, searching, and updating contacts with 25+ fields'.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs update_contact safely

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

update_contact Rate-limited

update_contact 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": {
    "update_contact": {
      "limits": [
        {
          "counter": "update_contact_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 MCP Google Contacts Server, apply this rule, and every update_contact call is checked against it from then on.

FAQ

Questions about update_contact

What does the update_contact tool do? +

update_contact is a write tool on the MCP Google Contacts Server MCP server. It is categorised as a Write tool in the MCP Google Contacts 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 update_contact? +

Register the MCP Google Contacts Server MCP server in PolicyLayer and add a rule for update_contact: 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 MCP Google Contacts Server. Nothing to install.

What risk level is update_contact? +

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

Can I rate-limit update_contact? +

Yes. Add a rate_limit block to the update_contact 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_contact completely? +

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

update_contact is provided by the MCP Google Contacts Server MCP server (4tal/mcp-google-contacts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on MCP Google Contacts Server, and thousands of servers like it.

This server

All 19 MCP Google Contacts Server tools →

Across the catalogue

aroflo_create_or_update_record on AroFlo MCP → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →