clear_field · Hermes Computer Use MCP: Risk & Policy

WHAT IT DOES

What clear_field does on Hermes Computer Use

AI agents invoke clear_field to trigger actions in Hermes Computer Use. 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 clear_field needs a policy

This tool executes OS-level input actions (select all + delete keystrokes) against a live browser. While it clears a field rather than permanently deleting stored data, it is an active browser automation action with side effects that depend on context.

From the tool's definition 'Select all text in the focused widget and delete it' — performs OS-level keyboard actions (select-all + delete) on a real browser via mouse/keyboard automation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

clear_field Rate-limited

clear_field 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": {
    "clear_field": {
      "limits": [
        {
          "counter": "clear_field_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 Hermes Computer Use, so you can run agents against it safely.

FAQ

Questions about clear_field

What does the clear_field tool do? +

Select all text in the focused widget and delete it. Handy before. It is categorised as a Execute tool in the Hermes Computer Use MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on clear_field? +

Register the Hermes Computer Use MCP server in PolicyLayer and add a rule for clear_field: 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 Hermes Computer Use. Nothing to install.

What risk level is clear_field? +

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

Can I rate-limit clear_field? +

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

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

clear_field is provided by the Hermes Computer Use MCP server (noah3521/hermes-computer-use). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

// THE FULL RECORD

clear_field is one line of Hermes Computer Use's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

Teams ship this data inside their own products. See what a licence covers →