oboe_cancel_session · Obo MCP: Risk & Policy

WHAT IT DOES

What oboe_cancel_session does on Obo

AI agents use oboe_cancel_session 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_cancel_session needs a policy

This tool modifies the state of a session by marking it as cancelled, which is a state change (write operation). It does not delete the session or its items ('open items are left as-is'), so it is not destructive. However, cancellation may be difficult to reverse depending on the workflow, keeping severity at medium.

From the tool's definition Mark a session cancelled. Open items are left as-is.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

oboe_cancel_session Rate-limited

oboe_cancel_session 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_cancel_session": {
      "limits": [
        {
          "counter": "oboe_cancel_session_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 Obo, so you can run agents against it safely.

FAQ

Questions about oboe_cancel_session

What does the oboe_cancel_session tool do? +

Mark a session cancelled. Open items are left as-is. 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_cancel_session? +

Register the Obo MCP server in PolicyLayer and add a rule for oboe_cancel_session: 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_cancel_session? +

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

Can I rate-limit oboe_cancel_session? +

Yes. Add a rate_limit block to the oboe_cancel_session 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_cancel_session completely? +

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

oboe_cancel_session 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.