# append_values

Appends rows after the last row of the data table that contains the given range — pass the table's region (e.g. "Sheet1!A1:D1" or just "Sheet1") and the API finds the first free row itself; the response's updates.updatedRange shows where the rows actually landed. insert_data_option INSERT_ROWS pushes existing data below down; OVERWRITE (default behaviour) writes into the free rows after the table. Never retried after an ambiguous failure — re-appending would duplicate the rows, so check the sheet first (read_values) before re-sending.

Agent View of the PolicyLayer registry record for `append_values`. HTML page: https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/append-values

## Facts

- Tool: `append_values`
- Server: Mcp Google Sheets (`@a1-x-tech/mcp-google-sheets`) — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets.md
- Install: `npx -y @a1-x-tech/mcp-google-sheets`
- Homepage: https://github.com/A1-x-Tech/mcp-google-sheets
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 5 (3 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `range` | string | yes | A1 range identifying the table to append to (the API scans it for the last data row). |
| `values` | array | yes | 2-D array of cell values, outer array = rows: [["Name","Score"],["Ada",42]]. null leaves the existing cell untouched. |
| `spreadsheet_id` | string | yes | The spreadsheet id — the long id from the URL (docs.google.com/spreadsheets/d/<spreadsheetId>/edit) or from create_spreadsheet / search_spreadsheets output. |
| `insert_data_option` | string | no | OVERWRITE writes after the table (default); INSERT_ROWS inserts new rows, shifting data below. |
| `value_input_option` | string | no | USER_ENTERED (default) parses formulas/numbers/dates; RAW stores literal strings. |

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": "append_values",
    "arguments": {
      "range": "<range>",
      "values": [],
      "spreadsheet_id": "<spreadsheet_id>"
    }
  }
}
```

## Why append_values is rated Low

Even though append_values 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 append_values to retrieve information from Mcp Google Sheets 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 Google Sheets:

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

## Other tools on Mcp Google Sheets (19)

- `clear_values` — Destructive — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/clear-values.md
- `manage_dimensions` — Destructive — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/manage-dimensions.md
- `manage_sheets` — Destructive — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/manage-sheets.md
- `raw_request` — Execute — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/raw-request.md
- `get_spreadsheet` — Read — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/get-spreadsheet.md
- `read_values` — Read — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/read-values.md
- `search_spreadsheets` — Read — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/search-spreadsheets.md
- `batch_write_values` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/batch-write-values.md
- `create_spreadsheet` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/create-spreadsheet.md
- `format_cells` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/format-cells.md
- `manage_charts` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/manage-charts.md
- `manage_conditional_formats` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/manage-conditional-formats.md
- `manage_permissions` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/manage-permissions.md
- `manage_protected_ranges` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/manage-protected-ranges.md
- `manage_tables` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/manage-tables.md
- `set_borders` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/set-borders.md
- `set_data_validation` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/set-data-validation.md
- `set_frozen` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/set-frozen.md
- `write_values` — Write — https://policylayer.com/tools/a1-x-tech-mcp-google-sheets/write-values.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=a1-x-tech-mcp-google-sheets · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/a1-x-tech-mcp-google-sheets