zernio_update_contact_field

Update a custom field value for a contact.

SERVERZernio SOURCEeyalm321/zernio-mcp

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/eyalm321-zernio-mcp/zernio-update-contact-field.md

WHAT IT DOES

What zernio_update_contact_field does on Zernio

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

RISK

Why zernio_update_contact_field is rated Medium

This tool creates or modifies contact records in the Zernio platform. While the change is reversible (can be updated again), it affects stored customer/contact information which could impact business operations, communication history, or audience segmentation.

From the tool's definition Tool name contains 'update' and description states 'Update a custom field value for a contact' — modifies contact data reversibly.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs zernio_update_contact_field safely

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

zernio_update_contact_field Rate-limited

zernio_update_contact_field 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": {
    "zernio_update_contact_field": {
      "limits": [
        {
          "counter": "zernio_update_contact_field_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 Zernio, apply this rule, and every zernio_update_contact_field call is checked against it from then on.

FAQ

Questions about zernio_update_contact_field

What does the zernio_update_contact_field tool do? +

Update a custom field value for a contact. It is categorised as a Write tool in the Zernio MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on zernio_update_contact_field? +

Register the Zernio MCP server in PolicyLayer and add a rule for zernio_update_contact_field: 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 Zernio. Nothing to install.

What risk level is zernio_update_contact_field? +

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

Can I rate-limit zernio_update_contact_field? +

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

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

zernio_update_contact_field is provided by the Zernio MCP server (eyalm321/zernio-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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Guides

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