# variables_update

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

Agent View of the PolicyLayer registry record for `variables_update`. HTML page: https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/variables-update

## Facts

- Tool: `variables_update`
- Server: Samarth Gtm Mcp (`samarth-gtm-mcp`) — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp.md
- Install: `npx -y samarth-gtm-mcp`
- Homepage: https://github.com/samarthanalytics-sj/samarth-analytics-mcp
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "variables_update",
    "arguments": {}
  }
}
```

## 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 own 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."

## Use case

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.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Samarth Gtm Mcp:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "variables_update": {
      "limits": [
        {
          "counter": "variables_update_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Samarth Gtm Mcp (235)

- `built_in_variables_disable` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/built-in-variables-disable.md
- `delete_ga4_account` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/delete-ga4-account.md
- `delete_ga4_property` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/delete-ga4-property.md
- `delete_gtm_client` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/delete-gtm-client.md
- `delete_gtm_folder` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/delete-gtm-folder.md
- `delete_gtm_tag` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/delete-gtm-tag.md
- `delete_gtm_trigger` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/delete-gtm-trigger.md
- `delete_gtm_variable` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/delete-gtm-variable.md
- `delete_unused_gtm_triggers` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/delete-unused-gtm-triggers.md
- `delete_unused_gtm_variables` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/delete-unused-gtm-variables.md
- `environments_delete` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/environments-delete.md
- `folders_delete` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/folders-delete.md
- `forget_memory` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/forget-memory.md
- `ga4_delete_account` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/ga4-delete-account.md
- `ga4_delete_property` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/ga4-delete-property.md
- `tags_delete` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/tags-delete.md
- `triggers_delete` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/triggers-delete.md
- `user_permissions_delete` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/user-permissions-delete.md
- `variables_delete` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/variables-delete.md
- `versions_delete` — Destructive — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/versions-delete.md
- `consent_compliance_audit` — Execute — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/consent-compliance-audit.md
- `consent_scenario_capture` — Execute — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/consent-scenario-capture.md
- `environments_reauthorize` — Execute — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/environments-reauthorize.md
- `run_ga4_report` — Execute — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/run-ga4-report.md
- `runtime_synthetic_test` — Execute — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/runtime-synthetic-test.md
- `site_crawl` — Execute — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/site-crawl.md
- `suggest_tags_from_url` — Execute — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/suggest-tags-from-url.md
- `versions_publish` — Execute — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/versions-publish.md
- `workspace_create_version_and_publish` — Execute — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/workspace-create-version-and-publish.md
- `update_google_ads_campaign_budget` — Financial — https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp/update-google-ads-campaign-budget.md
- …and 205 more: https://policylayer.com/tools/io-github-samarthanalytics-sj-samarth-gtm-mcp.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-samarthanalytics-sj-samarth-gtm-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-samarthanalytics-sj-samarth-gtm-mcp