add_row · CSV MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_row does on CSV MCP Server

AI agents use add_row to create or update resources in CSV MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your CSV MCP Server environment.

WHY IT NEEDS A POLICY

Why add_row needs a policy

This tool creates new data entries in a CSV file, which is a reversible write operation. It does not execute code, delete data, or move money. However, it carries medium severity because uncontrolled row additions could corrupt data integrity, fill storage, or inject malicious records into datasets that downstream systems depend on.

From the tool's definition Tool name 'add_row' and description 'Add a new row to the CSV file' indicate creation and modification of data within a CSV file.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_row Rate-limited

add_row 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_row": {
      "limits": [
        {
          "counter": "add_row_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches CSV MCP Server, so you can run agents against it safely.

FAQ

Questions about add_row

What does the add_row tool do? +

Add a new row to the CSV file. It is categorised as a Write tool in the CSV MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_row? +

Register the CSV MCP Server MCP server in PolicyLayer and add a rule for add_row: 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 CSV MCP Server. Nothing to install.

What risk level is add_row? +

add_row is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit add_row? +

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

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

add_row is provided by the CSV MCP Server MCP server (novaai-innovation/csv-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.