ecrire_fichier · MCP File Explorer MCP: Risk & Policy

WHAT IT DOES

What ecrire_fichier does on MCP File Explorer

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

WHY IT NEEDS A POLICY

Why ecrire_fichier needs a policy

This tool writes content to a file on the local filesystem. While it could overwrite existing files (which borders on destructive), the typical interpretation of 'write content to a file' is a create/update operation. However, overwriting existing files without versioning is semi-irreversible, so severity is high.

From the tool's definition "Écrit du contenu dans un fichier" (Writes content to a file)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ecrire_fichier Rate-limited

ecrire_fichier 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": {
    "ecrire_fichier": {
      "limits": [
        {
          "counter": "ecrire_fichier_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 MCP File Explorer, so you can run agents against it safely.

FAQ

Questions about ecrire_fichier

What does the ecrire_fichier tool do? +

Écrit du contenu dans un fichier. It is categorised as a Write tool in the MCP File Explorer MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on ecrire_fichier? +

Register the MCP File Explorer MCP server in PolicyLayer and add a rule for ecrire_fichier: 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 File Explorer. Nothing to install.

What risk level is ecrire_fichier? +

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

Can I rate-limit ecrire_fichier? +

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

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

ecrire_fichier is provided by the MCP File Explorer MCP server (meima-ely/mcp-file-explorer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.