stop_runtime_session | PolicyLayer

WHAT IT DOES

What stop_runtime_session does on CloudWatch Application Signals MCP Server

AI agents invoke stop_runtime_session to trigger actions in CloudWatch Application Signals 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

Stopping a runtime session is an Execute-category action because it triggers termination of an external operation (a running session) whose effects depend on the argument provided. It's not Read (no data retrieval), Write (not creating/modifying data reversibly), Destructive (session termination is not permanent data deletion, though it has effects), or Financial.

From the tool's definition Tool name 'stop_runtime_session' indicates termination of an active runtime session. While description is empty, the action of stopping a runtime session is an external operation with side effects that cannot be easily reversed and depends on which session is…

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 CloudWatch Application Signals 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 CloudWatch Application Signals MCP Server — nothing to install.
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EXPLORE

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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 CloudWatch Application Signals 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 CloudWatch Application Signals 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 CloudWatch Application Signals 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 CloudWatch Application Signals MCP Server MCP server (awslabs.cloudwatch-applicationsignals-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 CloudWatch Application Signals MCP Server tool call.

Start from CloudWatch Application Signals MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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