aggregate

ServerMcp Excel
CategoryRead

WHAT IT DOES

What aggregate does on Mcp Excel

AI agents call aggregate to retrieve information from Mcp Excel without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why aggregate needs a policy

The aggregate tool is purely a data retrieval and analysis operation. It computes statistical summaries over Excel columns but does not create, modify, delete, or execute external operations. The capability to 'return Excel formula for dynamic updates' indicates the formula is returned for user reference, not that the tool modifies the spreadsheet.

From the tool's definition Tool description states it 'Perform[s] aggregation (sum, mean, count, etc.) on a column with optional filters' and 'Returns aggregated value and Excel formula for dynamic updates.' The examples (Total revenue, Average order value, Maximum temperature, Count…

Documented attack patterns abuse exactly the kind of access aggregate gives an agent:

POLICY

How to control aggregate

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Excel, and nothing reaches the server without passing your rules. This is the rule we recommend for aggregate:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "aggregate": {}
  }
}

aggregate is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Mcp Excel — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Mcp Excel tools

Execute calculate_expression Calculate expression between columns (e.g., Read analyze_overlap Analyze overlap between multiple filter sets (Venn diagram analysis). Returns intersection Read calculate_moving_average Calculate moving average with specified window size. Useful for trend analysis and smoothi Read calculate_period_change Calculate period-over-period change (month/quarter/year). Returns periods with values, abs Read calculate_running_total Calculate running total (cumulative sum) ordered by a column. Supports grouping for per-ca Read compare_sheets Compare data between two sheets using a key column. Returns rows with differences and stat Read correlate Calculate correlation matrix between multiple columns (supports 2+ columns). Supports pear Read detect_outliers Detect outliers in a column using IQR or Z-score method. Returns outlier rows with indices

All 25 Mcp Excel tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about aggregate

What does the aggregate tool do? +

Perform aggregation (sum, mean, count, etc.) on a column with optional filters. Returns aggregated value and Excel formula for dynamic updates. Use for: totals, averages, min/max values, statistical summaries, conditional aggregations, KPI calculations. EXAMPLES: Total revenue for Q4, Average order value for VIP customers, Maximum temperature in July, Count of defective items, Standard deviation of prices. It is categorised as a Read tool in the Mcp Excel MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on aggregate? +

Register the Mcp Excel MCP server in PolicyLayer and add a rule for aggregate: 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 Mcp Excel. Nothing to install.

What risk level is aggregate? +

aggregate is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit aggregate? +

Yes. Add a rate_limit block to the aggregate 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.

How do I block aggregate completely? +

Set action: deny in the PolicyLayer policy for aggregate. 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.

What MCP server provides aggregate? +

aggregate is provided by the Mcp Excel MCP server (jwadow/mcp-excel). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Excel tool call.

Start from Mcp Excel, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →

Free to start. No card required.

25 Mcp Excel tools catalogued and risk-classified — across an index of 43,000+ MCP servers.