start_file_watch · Claude MCP Server Integration MCP

WHAT IT DOES

What start_file_watch does on Claude MCP Server Integration

AI agents invoke start_file_watch to trigger actions in Claude MCP Server Integration. 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 start_file_watch needs a policy

This tool activates monitoring of the filesystem, which executes a continuous background process. While not destructive or modifying data, it represents code/process execution that observes system state and triggers actions based on events.

From the tool's definition 'ファイル・ディレクトリの監視を開始します' (Start file/directory watch/monitoring). The tool initiates a file system monitoring operation, which triggers external system operations with effects dependent on configuration and monitored events.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

start_file_watch Rate-limited

start_file_watch 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": {
    "start_file_watch": {
      "limits": [
        {
          "counter": "start_file_watch_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 Claude MCP Server Integration, so you can run agents against it safely.

FAQ

Questions about start_file_watch

What does the start_file_watch tool do? +

ファイル・ディレクトリの監視を開始します. It is categorised as a Execute tool in the Claude MCP Server Integration MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on start_file_watch? +

Register the Claude MCP Server Integration MCP server in PolicyLayer and add a rule for start_file_watch: 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 Claude MCP Server Integration. Nothing to install.

What risk level is start_file_watch? +

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

Can I rate-limit start_file_watch? +

Yes. Add a rate_limit block to the start_file_watch 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_file_watch completely? +

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

start_file_watch is provided by the Claude MCP Server Integration MCP server (mokemoke0821/claude-mcp-integration). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.