open_project · Pl MCP: Risk & Policy

WHAT IT DOES

What open_project does on Pl

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

WHY IT NEEDS A POLICY

Why open_project needs a policy

Opening a project for editing implies a state change (project is now in an 'open/editing' state), which is a reversible write-like side effect. It is not purely a read operation since it prepares the project for modification. It does not delete, execute code, or involve finances. Severity is medium because misuse could lead to unintended edits on the wrong project.

From the tool's definition Open a project for editing. Required before working with blocks.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

open_project Rate-limited

open_project 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": {
    "open_project": {
      "limits": [
        {
          "counter": "open_project_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 Pl, so you can run agents against it safely.

FAQ

Questions about open_project

What does the open_project tool do? +

Open a project for editing. Required before working with blocks. It is categorised as a Write tool in the Pl MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on open_project? +

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

What risk level is open_project? +

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

Can I rate-limit open_project? +

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

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

open_project is provided by the Pl MCP server (@milaboratories/pl-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.