AI agents use excel_insert_columns to create or update resources in Excel — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Excel environment.
This tool modifies the structure of Excel files by inserting columns, which is a reversible change. It does not execute arbitrary code, delete data, or move money. While it alters the spreadsheet structure, the operation can be undone (column removal), classifying it as Write rather than Destructive.
From the tool's definition Tool name 'excel_insert_columns' and description '插入列' (insert columns) indicate a data modification operation that adds new columns to an Excel sheet.
Documented attack patterns abuse exactly the kind of access excel_insert_columns gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Excel, and nothing reaches the server without passing your rules. This is the rule we recommend for excel_insert_columns:
{
"version": "1",
"default": "deny",
"tools": {
"excel_insert_columns": {
"limits": [
{
"counter": "excel_insert_columns_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}excel_insert_columns 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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插入列. It is categorised as a Write tool in the Excel MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Excel MCP server in PolicyLayer and add a rule for excel_insert_columns: 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 Excel. Nothing to install.
excel_insert_columns 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 excel_insert_columns 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 excel_insert_columns. 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.
excel_insert_columns is provided by the Excel MCP server (tangentdomain/excel-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Excel, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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36 Excel tools catalogued and risk-classified — across an index of 43,000+ MCP servers.