add-project · Things App MCP: Risk & Policy

WHAT IT DOES

What add-project does on Things App MCP

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

WHY IT NEEDS A POLICY

Why add-project needs a policy

This tool creates new project records in the Things 3 application, which is a reversible write operation. It does not execute arbitrary code, delete data, or involve financial transactions. The blast radius is limited to the user's task management data, and the operation can be undone through normal application means. Severity is low because creating a project is a routine, non-destructive action.

From the tool's definition Tool name is "add-project" and description states "Create a new project in Things" with support for setting various properties. The word "Create" explicitly indicates data modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add-project Rate-limited

add-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": {
    "add-project": {
      "limits": [
        {
          "counter": "add-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 Things App MCP, so you can run agents against it safely.

FAQ

Questions about add-project

What does the add-project tool do? +

Create a new project in Things. Supports setting title, notes, when/deadline dates, tags, area assignment, and initial to-dos. It is categorised as a Write tool in the Things App MCP 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-project? +

Register the Things App MCP server in PolicyLayer and add a rule for add-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 Things App MCP. Nothing to install.

What risk level is add-project? +

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

Can I rate-limit add-project? +

Yes. Add a rate_limit block to the add-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 add-project completely? +

Set action: deny in the PolicyLayer policy for add-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 add-project? +

add-project is provided by the Things App MCP server (lucas-flatwhite/things-app-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.