stop_runtime_session | PolicyLayer

WHAT IT DOES

What stop_runtime_session does on AWS Well-Architected Security Assessment Tool MCP Server

AI agents invoke stop_runtime_session to trigger actions in AWS Well-Architected Security Assessment Tool MCP Server. 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.

THE RISK

High Risk

Why stop_runtime_session needs a policy

A tool that stops runtime sessions performs an action whose effects depend on runtime state and arguments provided. This is more severe than Write (reversible modification) because session termination may interrupt critical processes. It does not permanently delete data (Destructive), execute arbitrary code directly (Execute category reserved for script/command execution), or move money (Financial).

From the tool's definition Tool name 'stop_runtime_session' indicates termination of an active runtime session. The description is empty, limiting direct evidence.

Documented attack patterns abuse exactly the kind of access stop_runtime_session gives an agent:

POLICY

How to control stop_runtime_session

PolicyLayer is an MCP gateway — it sits between your AI agents and AWS Well-Architected Security Assessment Tool MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for stop_runtime_session:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "stop_runtime_session": {
      "limits": [
        {
          "counter": "stop_runtime_session_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

stop_runtime_session 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.

Create a free account and register AWS Well-Architected Security Assessment Tool MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

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EXPLORE

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All 805 AWS Well-Architected Security Assessment Tool MCP Server tools →

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Go deeper

Govern code and CI agents → Branch allowlists, approval on merges, and rate caps on the build and pipeline tools agents trigger.
High-risk tools in AWS Well-Architected Security Assessment Tool MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
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PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about stop_runtime_session

What does the stop_runtime_session tool do? +

stop_runtime_session. It is categorised as a Execute tool in the AWS Well-Architected Security Assessment Tool MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on stop_runtime_session? +

Register the AWS Well-Architected Security Assessment Tool MCP Server MCP server in PolicyLayer and add a rule for stop_runtime_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 AWS Well-Architected Security Assessment Tool MCP Server. Nothing to install.

What risk level is stop_runtime_session? +

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

Can I rate-limit stop_runtime_session? +

Yes. Add a rate_limit block to the stop_runtime_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 stop_runtime_session completely? +

Set action: deny in the PolicyLayer policy for stop_runtime_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 stop_runtime_session? +

stop_runtime_session is provided by the AWS Well-Architected Security Assessment Tool MCP Server MCP server (awslabs.well-architected-security-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every AWS Well-Architected Security Assessment Tool MCP Server tool call.

Start from AWS Well-Architected Security Assessment Tool MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →

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805 AWS Well-Architected Security Assessment Tool MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.