Add a new sheet tab to an existing Synology Spreadsheet file. Provide either file_id or name.
AI agents use spreadsheet_add_sheet 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.
Adding a sheet is a CREATE/MODIFY operation (Write category) rather than READ (no data retrieval), EXECUTE (no code execution or external triggers), or DESTRUCTIVE (reversible). Severity is medium because it modifies user data in a collaborative tool, but impact is limited to adding a sheet structure without data loss. High confidence based on clear action verb 'Add' and explicit description of sheet creation.
From the tool's definition Tool 'spreadsheet_add_sheet' with description 'Add a new sheet tab to an existing Synology Spreadsheet file' directly modifies spreadsheet structure by creating a new sheet.
Documented attack patterns abuse exactly the kind of access spreadsheet_add_sheet 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_add_sheet:
{
"version": "1",
"default": "deny",
"tools": {
"spreadsheet_add_sheet": {
"limits": [
{
"counter": "spreadsheet_add_sheet_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}spreadsheet_add_sheet 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.
Add a new sheet tab to an existing Synology Spreadsheet file. Provide either file_id or name. 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_add_sheet: 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_add_sheet 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_add_sheet 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_add_sheet. 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_add_sheet 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.