insert · Filopastry MCP: Risk & Policy

WHAT IT DOES

What insert does on Filopastry

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

WHY IT NEEDS A POLICY

Why insert needs a policy

This tool modifies code by inserting new lines at specified positions. While reversible (code can be edited or undone), it alters the state of the live coding session and affects what audio is generated. It is a Write operation rather than Execute because insertion itself doesn't trigger evaluation—evaluation would typically be handled separately.

From the tool's definition Tool name 'insert' combined with description 'Insert code at specific line' indicates creation/modification of code content in the live coding environment.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

insert Rate-limited

insert 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": {
    "insert": {
      "limits": [
        {
          "counter": "insert_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 Filopastry, so you can run agents against it safely.

FAQ

Questions about insert

What does the insert tool do? +

Insert code at specific line. It is categorised as a Write tool in the Filopastry MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on insert? +

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

What risk level is insert? +

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

Can I rate-limit insert? +

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

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

insert is provided by the Filopastry MCP server (youwenshao/filopastry). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.