json_toggle · AWS AppSync MCP Server MCP: Risk & Policy

WHAT IT DOES

What json_toggle does on AWS AppSync MCP Server

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

WHY IT NEEDS A POLICY

Why json_toggle needs a policy

The tool modifies data by toggling a boolean value at a specified path, which is a reversible write operation. It creates or updates a configuration value but does not delete or irreversibly destroy data. Severity is medium because misconfiguration of AppSync settings could affect service behavior, but the change is reversible.

From the tool's definition Toggle boolean value at path

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

json_toggle Rate-limited

json_toggle 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": {
    "json_toggle": {
      "limits": [
        {
          "counter": "json_toggle_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 AWS AppSync MCP Server, so you can run agents against it safely.

FAQ

Questions about json_toggle

What does the json_toggle tool do? +

Toggle boolean value at path. It is categorised as a Write tool in the AWS AppSync MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on json_toggle? +

Register the AWS AppSync MCP Server MCP server in PolicyLayer and add a rule for json_toggle: 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 AppSync MCP Server. Nothing to install.

What risk level is json_toggle? +

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

Can I rate-limit json_toggle? +

Yes. Add a rate_limit block to the json_toggle 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 json_toggle completely? +

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

json_toggle is provided by the AWS AppSync MCP Server MCP server (awslabs.aws-appsync-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.