write_project_file · Openl MCP: Risk & Policy

WHAT IT DOES

What write_project_file does on Openl

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

WHY IT NEEDS A POLICY

Why write_project_file needs a policy

The tool's documented capability to 'create or replace' files indicates reversible write operations on project data. This is a Write category tool rather than Destructive because file replacement via an explicit write operation is typically reversible (old content may be recoverable or the operation can be undone).

From the tool's definition "Create or replace a file in a project" — the tool creates new files or modifies existing ones through file write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_project_file Rate-limited

write_project_file 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": {
    "write_project_file": {
      "limits": [
        {
          "counter": "write_project_file_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 Openl, so you can run agents against it safely.

FAQ

Questions about write_project_file

What does the write_project_file tool do? +

Create or replace a file in a project by its project-relative path. Provide. It is categorised as a Write tool in the Openl MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_project_file? +

Register the Openl MCP server in PolicyLayer and add a rule for write_project_file: 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 Openl. Nothing to install.

What risk level is write_project_file? +

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

Can I rate-limit write_project_file? +

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

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

write_project_file is provided by the Openl MCP server (openl-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.