# list_hot_tablets

Lists hot tablets in a Cloud Bigtable cluster. Start time defaults to Now if it is unset, and end time defaults to Now - 24 hours if it is unset. The start time should be less than the end time, and the maximum allowed time range between start time and end time is 48 hours. Start time and end time should have values between Now and Now - 14 days.

Agent View of the PolicyLayer registry record for `list_hot_tablets`. HTML page: https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/list-hot-tablets

## Facts

- Tool: `list_hot_tablets`
- Server: Mcp (`https://bigtableadmin.googleapis.com/mcp`) — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp.md
- Homepage: https://github.com/https://bigtableadmin.googleapis.com/mcp
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 7 (3 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `endTime` | string | no | Optional. The end time to list hot tablets. End time defaults to Now - 24 hours if it is unset. The end time should be greater than the start time, and the maxi |
| `pageSize` | integer | no | Optional. Maximum number of results per page. |
| `clusterId` | string | yes | Required. The cluster ID within the instance (e.g., "my-cluster"). |
| `pageToken` | string | no | Optional. The value of `next_page_token` returned by a previous call. |
| `projectId` | string | yes | Required. The project ID (e.g., "my-project"). |
| `startTime` | string | no | Optional. The start time to list hot tablets. The hot tablets in the response will have start times between the requested start time and end time. Start time de |
| `instanceId` | string | yes | Required. The instance ID within the project (e.g., "my-instance"). |

Parameters from the server's own tool schema.

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

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "list_hot_tablets",
    "arguments": {
      "clusterId": "<clusterId>",
      "projectId": "<projectId>",
      "instanceId": "<instanceId>"
    }
  }
}
```

## Why list_hot_tablets is rated Low

Even though list_hot_tablets only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

## Use case

AI agents call list_hot_tablets to retrieve information from Mcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

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

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_hot_tablets": {}
  }
}
```

## Other tools on Mcp (13)

- `delete_instance` — Destructive — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/delete-instance.md
- `delete_logical_view` — Destructive — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/delete-logical-view.md
- `delete_table` — Destructive — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/delete-table.md
- `get_instance` — Read — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/get-instance.md
- `get_logical_view` — Read — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/get-logical-view.md
- `get_table` — Read — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/get-table.md
- `list_instances` — Read — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/list-instances.md
- `list_logical_views` — Read — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/list-logical-views.md
- `list_tables` — Read — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/list-tables.md
- `create_instance` — Write — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/create-instance.md
- `create_logical_view` — Write — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/create-logical-view.md
- `create_table` — Write — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/create-table.md
- `update_logical_view` — Write — https://policylayer.com/tools/com-googleapis-bigtableadmin-mcp/update-logical-view.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=com-googleapis-bigtableadmin-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/com-googleapis-bigtableadmin-mcp