Register a Synology Spreadsheet so it can be addressed by name in other tools. Provide the alphanumeric ID from the file URL /oo/r/{id}.
AI agents use spreadsheet_register 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 is a metadata registration operation that reversibly writes configuration state to enable subsequent tool usage. It does not delete data (not Destructive), execute external code (not Execute), move money (not Financial), or merely read existing data (not Read). The operation is non-destructive and can be undone by de-registering the spreadsheet.
From the tool's definition Tool description explicitly states 'Register a Synology Spreadsheet so it can be addressed by name in other tools.' Registration creates or modifies configuration state (recording a mapping between ID and name) without destructive effects.
Documented attack patterns abuse exactly the kind of access spreadsheet_register 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_register:
{
"version": "1",
"default": "deny",
"tools": {
"spreadsheet_register": {
"limits": [
{
"counter": "spreadsheet_register_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}spreadsheet_register 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.
Free to start. No card required.
Register a Synology Spreadsheet so it can be addressed by name in other tools. Provide the alphanumeric ID from the file URL /oo/r/{id}. 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_register: 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_register 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_register 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_register. 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_register 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.