AI agents call json_arrindex to retrieve information from Awslabs Amazon Sns Sqs without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple lookup operation to retrieve the position of a value in an array—a pure read operation with no side effects. It does not modify, create, delete, execute, or affect external systems. The low severity reflects minimal risk from misuse, as the worst outcome would be returning incorrect index information.
From the tool's definition Tool name 'json_arrindex' and description 'Get the index of value in array at path' indicate a retrieval/query operation that searches for a value position within an array structure.
Documented attack patterns abuse exactly the kind of access json_arrindex gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Awslabs Amazon Sns Sqs, and nothing reaches the server without passing your rules. This is the rule we recommend for json_arrindex:
{
"version": "1",
"default": "deny",
"tools": {
"json_arrindex": {}
}
}json_arrindex is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the index of value in array at path. It is categorised as a Read tool in the Awslabs Amazon Sns Sqs MCP Server, which means it retrieves data without modifying state.
Register the Awslabs Amazon Sns Sqs MCP server in PolicyLayer and add a rule for json_arrindex: 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 Awslabs Amazon Sns Sqs. Nothing to install.
json_arrindex is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the json_arrindex 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.
Set action: deny in the PolicyLayer policy for json_arrindex. 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.
json_arrindex is provided by the Awslabs Amazon Sns Sqs MCP server (awslabs.amazon-sns-sqs-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Awslabs Amazon Sns Sqs, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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