# update-contact

Modify existing contact. Returns: updated contact with new etag. Use when: changing contact details. Note: requires updatePersonFields to specify what to update.

Agent View of the PolicyLayer registry record for `update-contact`. HTML page: https://policylayer.com/tools/199-biotechnologies-mcp-google/update-contact

## Facts

- Tool: `update-contact`
- Server: MCP Google Workspace (`199-mcp/mcp-google`) — https://policylayer.com/tools/199-biotechnologies-mcp-google.md
- Homepage: https://github.com/199-mcp/mcp-google
- 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": "update-contact",
    "arguments": {}
  }
}
```

## Why update-contact is rated Medium

This tool creates or modifies contact data reversibly via the update operation. It does not delete data (which would be Destructive), execute arbitrary code (Execute), or move money (Financial). The severity is medium because unauthorized modification of contacts could enable social engineering, impersonation, or communication interception, but the damage is limited to contact metadata and reversible.

From the tool's own definition: "Tool description states 'Modify existing contact' and 'changing contact details', which indicates reversible modification of data. The return of 'updated contact with new etag' confirms the update operation completes successfully."

## Use case

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

## Recommended policy (PolicyLayer)

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

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "update-contact": {
      "limits": [
        {
          "counter": "update-contact_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on MCP Google Workspace (25)

- `delete-contact` — Destructive — https://policylayer.com/tools/199-biotechnologies-mcp-google/delete-contact.md
- `delete-email` — Destructive — https://policylayer.com/tools/199-biotechnologies-mcp-google/delete-email.md
- `delete-event` — Destructive — https://policylayer.com/tools/199-biotechnologies-mcp-google/delete-event.md
- `delete-label` — Destructive — https://policylayer.com/tools/199-biotechnologies-mcp-google/delete-label.md
- `get-contact` — Read — https://policylayer.com/tools/199-biotechnologies-mcp-google/get-contact.md
- `get-email` — Read — https://policylayer.com/tools/199-biotechnologies-mcp-google/get-email.md
- `get-freebusy` — Read — https://policylayer.com/tools/199-biotechnologies-mcp-google/get-freebusy.md
- `list-calendars` — Read — https://policylayer.com/tools/199-biotechnologies-mcp-google/list-calendars.md
- `list-colors` — Read — https://policylayer.com/tools/199-biotechnologies-mcp-google/list-colors.md
- `list-contacts` — Read — https://policylayer.com/tools/199-biotechnologies-mcp-google/list-contacts.md
- `list-emails` — Read — https://policylayer.com/tools/199-biotechnologies-mcp-google/list-emails.md
- `list-events` — Read — https://policylayer.com/tools/199-biotechnologies-mcp-google/list-events.md
- `list-labels` — Read — https://policylayer.com/tools/199-biotechnologies-mcp-google/list-labels.md
- `search-events` — Read — https://policylayer.com/tools/199-biotechnologies-mcp-google/search-events.md
- `batch-update-emails` — Write — https://policylayer.com/tools/199-biotechnologies-mcp-google/batch-update-emails.md
- `create-contact` — Write — https://policylayer.com/tools/199-biotechnologies-mcp-google/create-contact.md
- `create-draft` — Write — https://policylayer.com/tools/199-biotechnologies-mcp-google/create-draft.md
- `create-event` — Write — https://policylayer.com/tools/199-biotechnologies-mcp-google/create-event.md
- `create-label` — Write — https://policylayer.com/tools/199-biotechnologies-mcp-google/create-label.md
- `send-draft` — Write — https://policylayer.com/tools/199-biotechnologies-mcp-google/send-draft.md
- `send-email` — Write — https://policylayer.com/tools/199-biotechnologies-mcp-google/send-email.md
- `update-draft` — Write — https://policylayer.com/tools/199-biotechnologies-mcp-google/update-draft.md
- `update-email` — Write — https://policylayer.com/tools/199-biotechnologies-mcp-google/update-email.md
- `update-event` — Write — https://policylayer.com/tools/199-biotechnologies-mcp-google/update-event.md
- `update-label` — Write — https://policylayer.com/tools/199-biotechnologies-mcp-google/update-label.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`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=199-biotechnologies-mcp-google · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/199-biotechnologies-mcp-google