web_fill · K-Personal MCP: Risk & Policy

WHAT IT DOES

What web_fill does on K-Personal MCP

AI agents invoke web_fill to trigger actions in K-Personal MCP. 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 web_fill needs a policy

This tool performs browser automation by filling form fields, overwriting existing content. It triggers external operations in a browser context whose effects depend on arguments. While it modifies data in a form, the action itself is an execution of browser automation that can submit credentials, fill sensitive forms, or interact with web applications — making Execute the most appropriate category.

From the tool's definition '입력란에 텍스트를 채웁니다 (기존 값 덮어씀)' — fills input fields in a browser, overwriting existing values; part of headless browser automation suite

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

web_fill Rate-limited

web_fill 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": {
    "web_fill": {
      "limits": [
        {
          "counter": "web_fill_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 K-Personal MCP, so you can run agents against it safely.

FAQ

Questions about web_fill

What does the web_fill tool do? +

입력란에 텍스트를 채웁니다 (기존 값 덮어씀). It is categorised as a Execute tool in the K-Personal MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on web_fill? +

Register the K-Personal MCP server in PolicyLayer and add a rule for web_fill: 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 K-Personal MCP. Nothing to install.

What risk level is web_fill? +

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

Can I rate-limit web_fill? +

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

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

web_fill is provided by the K-Personal MCP server (lee30934-byte/k-personal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.