start_staged · Fs Git MCP: Risk & Policy

WHAT IT DOES

What start_staged does on Fs Git

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

WHY IT NEEDS A POLICY

Why start_staged needs a policy

Starting a staged editing session initializes a new editing context/branch for subsequent file modifications. This is a Write operation as it creates a new staged session state. It does not execute code, delete data, or involve financial transactions. Severity is medium because it sets up a session that could lead to significant file changes, but the action itself is reversible (see sibling tool 'abort_staged').

From the tool's definition Start a staged editing session

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

start_staged Rate-limited

start_staged 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": {
    "start_staged": {
      "limits": [
        {
          "counter": "start_staged_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 Fs Git, so you can run agents against it safely.

FAQ

Questions about start_staged

What does the start_staged tool do? +

Start a staged editing session. It is categorised as a Write tool in the Fs Git MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on start_staged? +

Register the Fs Git MCP server in PolicyLayer and add a rule for start_staged: 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 Fs Git. Nothing to install.

What risk level is start_staged? +

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

Can I rate-limit start_staged? +

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

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

start_staged is provided by the Fs Git MCP server (wojons/fs-git-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.