Add a new sheet (tab) to an existing Google Sheets spreadsheet
AI agents use google_sheets_add_sheet to create or update resources in Sage MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sage MCP environment.
Adding a sheet is a write operation that creates new data container structures. It modifies the target spreadsheet but is reversible (sheets can be deleted). The severity is medium because uncontrolled sheet creation could disrupt workflows, consume quota, or spam a shared spreadsheet, but the damage is containable and undoable.
From the tool's definition Tool name explicitly states 'add_sheet' and description confirms it 'Add a new sheet (tab) to an existing Google Sheets spreadsheet'. This creates new structural elements within a spreadsheet, modifying the workbook reversibly.
Documented attack patterns abuse exactly the kind of access google_sheets_add_sheet gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sage MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for google_sheets_add_sheet:
{
"version": "1",
"default": "deny",
"tools": {
"google_sheets_add_sheet": {
"limits": [
{
"counter": "google_sheets_add_sheet_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}google_sheets_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.
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Add a new sheet (tab) to an existing Google Sheets spreadsheet. It is categorised as a Write tool in the Sage MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sage MCP server in PolicyLayer and add a rule for google_sheets_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 Sage MCP. Nothing to install.
google_sheets_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 google_sheets_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 google_sheets_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.
google_sheets_add_sheet is provided by the Sage MCP server (sagemcp/sagemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 359 Sage MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
359 Sage MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.