sync_filesystem · Follow Plan MCP Server MCP: Risk & Policy

WHAT IT DOES

What sync_filesystem does on Follow Plan MCP Server

AI agents invoke sync_filesystem to trigger actions in Follow Plan MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why sync_filesystem needs a policy

Syncing the database with the filesystem is an operational action that reads from one source and writes/overwrites to another. It can have side effects that are not easily reversible (e.g., overwriting filesystem files or database records with stale/incorrect data), making it more than a simple Write.

From the tool's definition 'Sync database with filesystem' — triggers a synchronization operation between two data stores

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sync_filesystem Rate-limited

sync_filesystem stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sync_filesystem": {
      "limits": [
        {
          "counter": "sync_filesystem_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Follow Plan MCP Server, so you can run agents against it safely.

FAQ

Questions about sync_filesystem

What does the sync_filesystem tool do? +

Sync database with filesystem. It is categorised as a Execute tool in the Follow Plan MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on sync_filesystem? +

Register the Follow Plan MCP Server MCP server in PolicyLayer and add a rule for sync_filesystem: 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 Follow Plan MCP Server. Nothing to install.

What risk level is sync_filesystem? +

sync_filesystem is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit sync_filesystem? +

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

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

sync_filesystem is provided by the Follow Plan MCP Server MCP server (vibeclasses/follow-plan-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.