Create a new table in a sheet
AI agents use numbers_add_table to create or update resources in Iwork — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Iwork environment.
This tool creates new data structures (tables) in spreadsheets, which is a write operation. It modifies the document state reversibly—tables can be edited or deleted afterward. Severity is medium because misuse could corrupt spreadsheet structure or create unintended data layouts, but the effects are reversible and localized to the spreadsheet document.
From the tool's definition Tool name 'numbers_add_table' and description 'Create a new table in a sheet' indicate data creation. The Numbers documentation confirms this creates new tabular structures within spreadsheets.
Documented attack patterns abuse exactly the kind of access numbers_add_table gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Iwork, and nothing reaches the server without passing your rules. This is the rule we recommend for numbers_add_table:
{
"version": "1",
"default": "deny",
"tools": {
"numbers_add_table": {
"limits": [
{
"counter": "numbers_add_table_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}numbers_add_table 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 table in a sheet. It is categorised as a Write tool in the Iwork MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Iwork MCP server in PolicyLayer and add a rule for numbers_add_table: 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 Iwork. Nothing to install.
numbers_add_table 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 numbers_add_table 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 numbers_add_table. 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.
numbers_add_table is provided by the Iwork MCP server (reichenbach/iwork_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Iwork, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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114 Iwork tools catalogued and risk-classified — across an index of 43,000+ MCP servers.