resume_session · Astria-Index MCP: Risk & Policy

WHAT IT DOES

What resume_session does on Astria-Index

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

WHY IT NEEDS A POLICY

Why resume_session needs a policy

Based on the tool name and context from sibling tools (end_session, promote_session), resume_session likely reactivates or restores a previously ended or paused session, which is a write/state-change operation. However, the empty description significantly limits confidence. It could also be a read operation that simply loads session context. Defaulting to Write as resuming a session likely modifies session state.

From the tool's definition Tool name 'resume_session' and empty description; sibling tools include 'end_session', 'promote_session', suggesting session lifecycle management

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

resume_session Rate-limited

resume_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": {
    "resume_session": {
      "limits": [
        {
          "counter": "resume_session_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 Astria-Index, so you can run agents against it safely.

FAQ

Questions about resume_session

What does the resume_session tool do? +

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

How do I enforce a policy on resume_session? +

Register the Astria-Index MCP server in PolicyLayer and add a rule for resume_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 Astria-Index. Nothing to install.

What risk level is resume_session? +

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

Can I rate-limit resume_session? +

Yes. Add a rate_limit block to the resume_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 resume_session completely? +

Set action: deny in the PolicyLayer policy for resume_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 resume_session? +

resume_session is provided by the Astria-Index MCP server (pl-odin/astria-plugin). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.