variables_update

[WRITE] Update a GTM variable (read-modify-write — omitted fields are preserved;

SERVERSamarth Gtm Mcp SOURCEsamarth-gtm-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/io-github-samarthanalytics-sj-samarth-gtm-mcp/variables-update.md

WHAT IT DOES

What variables_update does on Samarth Gtm Mcp

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

RISK

Why variables_update is rated Medium

This tool creates or modifies GTM variable configuration data reversibly. It is a write operation that changes tracking/analytics configuration. Severity is high because misconfiguration of GTM variables could affect data collection, event tracking, or introduce unintended side effects across web properties, but changes are reversible (not destructive).

From the tool's definition Tool name 'variables_update' combined with description explicitly marked '[WRITE]' and describes 'Update a GTM variable' with read-modify-write semantics. Modifies GTM configuration state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs variables_update safely

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

variables_update Rate-limited

variables_update 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": {
    "variables_update": {
      "limits": [
        {
          "counter": "variables_update_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 Samarth Gtm Mcp, apply this rule, and every variables_update call is checked against it from then on.

FAQ

Questions about variables_update

What does the variables_update tool do? +

[WRITE] Update a GTM variable (read-modify-write — omitted fields are preserved;. It is categorised as a Write tool in the Samarth Gtm Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on variables_update? +

Register the Samarth Gtm MCP server in PolicyLayer and add a rule for variables_update: 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 Samarth Gtm Mcp. Nothing to install.

What risk level is variables_update? +

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

Can I rate-limit variables_update? +

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

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

variables_update is provided by the Samarth Gtm MCP server (samarth-gtm-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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