AI agents use format_alignment to create or update resources in Excel MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Excel MCP Server environment.
Formatting alignment in Excel cells modifies the workbook state in a reversible manner—the change can be undone or overwritten. This qualifies as Write rather than Read (has side effects) or Destructive (the change is reversible). Severity is medium because misuse could corrupt document formatting or create difficult-to-read spreadsheets, but the effect is cosmetic and recoverable.
From the tool's definition Tool name 'format_alignment' combined with server context of Excel file operations (create, read, write, format) indicates this modifies cell formatting properties. Server description explicitly lists 'format' as a capability.
Documented attack patterns abuse exactly the kind of access format_alignment gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Excel MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for format_alignment:
{
"version": "1",
"default": "deny",
"tools": {
"format_alignment": {
"limits": [
{
"counter": "format_alignment_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}format_alignment 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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format_alignment. It is categorised as a Write tool in the Excel MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Excel MCP Server MCP server in PolicyLayer and add a rule for format_alignment: 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 MCP Server. Nothing to install.
format_alignment 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 format_alignment 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 format_alignment. 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.
format_alignment is provided by the Excel MCP Server MCP server (mort-lab/excel-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Excel MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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17 Excel MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.