write_attribute_value · OpenRemote MCP Server MCP

WHAT IT DOES

What write_attribute_value does on OpenRemote MCP Server

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

WHY IT NEEDS A POLICY

Why write_attribute_value needs a policy

This tool creates or modifies data reversibly by updating asset attributes. It does not delete data (ruling out Destructive), does not execute arbitrary code (ruling out Execute), and does not involve financial transactions (ruling out Financial).

From the tool's definition Tool name contains "write" and description states "Write/update a single attribute value on an asset." Explicitly described as modifying data ("change sensor values, settings").

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_attribute_value Rate-limited

write_attribute_value 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": {
    "write_attribute_value": {
      "limits": [
        {
          "counter": "write_attribute_value_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 OpenRemote MCP Server, so you can run agents against it safely.

FAQ

Questions about write_attribute_value

What does the write_attribute_value tool do? +

Write/update a single attribute value on an asset. Use this to change sensor values, settings, etc. It is categorised as a Write tool in the OpenRemote MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_attribute_value? +

Register the OpenRemote MCP Server MCP server in PolicyLayer and add a rule for write_attribute_value: 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 OpenRemote MCP Server. Nothing to install.

What risk level is write_attribute_value? +

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

Can I rate-limit write_attribute_value? +

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

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

write_attribute_value is provided by the OpenRemote MCP Server MCP server (openremote/service-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.