oboe_update_field · Obo MCP: Risk & Policy

WHAT IT DOES

What oboe_update_field does on Obo

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

WHY IT NEEDS A POLICY

Why oboe_update_field needs a policy

The update_field operation modifies existing data (session or item field values) reversibly within the OBO workflow system. This is a Write action rather than Execute because it targets specific fields rather than executing arbitrary code.

From the tool's definition Tool name 'oboe_update_field' contains 'update', indicating modification of data. The server manages priority-scored items in JSON workflows as an alternative to 'manual file-write operations.' No description provided, but pattern matches sibling tools like…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

oboe_update_field Rate-limited

oboe_update_field 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": {
    "oboe_update_field": {
      "limits": [
        {
          "counter": "oboe_update_field_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about oboe_update_field

What does the oboe_update_field tool do? +

oboe_update_field. It is categorised as a Write tool in the Obo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on oboe_update_field? +

Register the Obo MCP server in PolicyLayer and add a rule for oboe_update_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 Obo. Nothing to install.

What risk level is oboe_update_field? +

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

Can I rate-limit oboe_update_field? +

Yes. Add a rate_limit block to the oboe_update_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 oboe_update_field completely? +

Set action: deny in the PolicyLayer policy for oboe_update_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 oboe_update_field? +

oboe_update_field is provided by the Obo MCP server (warnes-innovations/oboe-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.