get_column_names

ServerMcp Excel
CategoryRead

WHAT IT DOES

What get_column_names does on Mcp Excel

AI agents call get_column_names 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 get_column_names needs a policy

This tool only queries and returns column names from a spreadsheet sheet—a pure read operation that retrieves metadata without modifying, executing code, or affecting data. The example use cases (listing columns, verifying existence, building filters dynamically, checking schema) all involve inspection and discovery only. There is no capability to modify, delete, or execute arbitrary operations.

From the tool's definition Tool description explicitly states it retrieves 'list of column names' and is a 'quick operation for schema discovery without loading full data.' It performs 'column enumeration' and 'schema validation' which are read-only metadata operations with no side…

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

POLICY

How to control get_column_names

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 get_column_names:

policy.json

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

get_column_names 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 →

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EXPLORE

Related tools and policies

More Mcp Excel tools

Execute calculate_expression Calculate expression between columns (e.g., Read aggregate Perform aggregation (sum, mean, count, etc.) on a column with optional filters. Returns ag 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

All 25 Mcp Excel tools →

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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 get_column_names

What does the get_column_names tool do? +

Get list of column names from a sheet. Quick operation for schema discovery without loading full data. Use for: column enumeration, schema validation, filter building, data structure verification, column availability checks. EXAMPLES: List all available columns, Verify column exists before filtering, Get column names for dynamic filter building, Check schema consistency. 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 get_column_names? +

Register the Mcp Excel MCP server in PolicyLayer and add a rule for get_column_names: 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 get_column_names? +

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

Can I rate-limit get_column_names? +

Yes. Add a rate_limit block to the get_column_names 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 get_column_names completely? +

Set action: deny in the PolicyLayer policy for get_column_names. 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 get_column_names? +

get_column_names 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.

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