Create a new empty Synology Spreadsheet (.osheet). Note: the Spreadsheet API has no notion of destination folder; use Drive tools to move the file afterwards if needed.
AI agents use spreadsheet_create 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 new data (a spreadsheet document) in a structured, reversible manner. It does not execute arbitrary code, delete data, or move money. While it modifies the file system by adding a new file, this is a standard Write operation.
From the tool's definition Tool creates a new Synology Spreadsheet (.osheet) file. The description explicitly states 'Create a new empty' spreadsheet, which is a reversible write operation. Files can be subsequently deleted or modified.
Documented attack patterns abuse exactly the kind of access spreadsheet_create 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_create:
{
"version": "1",
"default": "deny",
"tools": {
"spreadsheet_create": {
"limits": [
{
"counter": "spreadsheet_create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}spreadsheet_create 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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Create a new empty Synology Spreadsheet (.osheet). Note: the Spreadsheet API has no notion of destination folder; use Drive tools to move the file afterwards if needed. 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_create: 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_create 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_create 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_create. 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_create 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.