Write values to a range of cells in a Synology Spreadsheet sheet. Provide either file_id or name. Set confirm=true to execute.
AI agents use spreadsheet_write_cells to create or update resources in Synology Office — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Synology Office environment.
This tool creates or modifies data reversibly within a spreadsheet—the defining characteristic of the Write category. While spreadsheet modifications can impact dependent calculations or data flows, the operation is not destructive (data can be overwritten or undone in most systems), not financial, and not code execution.
From the tool's definition Tool description states 'Write values to a range of cells in a Synology Spreadsheet sheet.' The action is explicitly a write operation that modifies spreadsheet data.
Documented attack patterns abuse exactly the kind of access spreadsheet_write_cells gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Synology Office, and nothing reaches the server without passing your rules. This is the rule we recommend for spreadsheet_write_cells:
{
"version": "1",
"default": "deny",
"tools": {
"spreadsheet_write_cells": {
"limits": [
{
"counter": "spreadsheet_write_cells_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}spreadsheet_write_cells 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.
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Write values to a range of cells in a Synology Spreadsheet sheet. Provide either file_id or name. Set confirm=true to execute. It is categorised as a Write tool in the Synology Office MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Synology Office MCP server in PolicyLayer and add a rule for spreadsheet_write_cells: 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 Synology Office. Nothing to install.
spreadsheet_write_cells is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the spreadsheet_write_cells 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.
Set action: deny in the PolicyLayer policy for spreadsheet_write_cells. 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.
spreadsheet_write_cells is provided by the Synology Office MCP server (vocweb/synology-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Synology Office, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
39 Synology Office tools catalogued and risk-classified — across an index of 43,000+ MCP servers.