Get the JSON value at path. Args: key: The name of the key path: The path in the JSON document (optional, defaults to root) indent: Number of spaces for indentation (optional) newline: Add newlines in formatted output (optional) space: Add spaces in formatted output (optional) Returns: JSON value...
AI agents call json_get to retrieve information from AWS without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries JSON data at a specified path without any side effects. It only reads and formats existing data. No creation, modification, deletion, code execution, or financial operations are possible with this tool. The formatting arguments (indent, newline, space) are purely presentational. This is a straightforward Read operation with minimal risk.
From the tool's definition Tool name and description: 'Get the JSON value at path' with arguments for key, path, and formatting options (indent, newline, space). Returns 'JSON value or error message' with no modification or deletion semantics.
Risk signalsAdmin/system-level operation
Documented attack patterns abuse exactly the kind of access json_get gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AWS, and nothing reaches the server without passing your rules. This is the rule we recommend for json_get:
{
"version": "1",
"default": "deny",
"tools": {
"json_get": {}
}
}json_get 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 JSON value at path. Args: key: The name of the key path: The path in the JSON document (optional, defaults to root) indent: Number of spaces for indentation (optional) newline: Add newlines in formatted output (optional) space: Add spaces in formatted output (optional) Returns: JSON value or error message. It is categorised as a Read tool in the AWS MCP Server, which means it retrieves data without modifying state.
Register the AWS MCP server in PolicyLayer and add a rule for json_get: 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. Nothing to install.
json_get 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_get 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_get. 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_get is provided by the AWS MCP server (@awslabs/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from AWS, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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300 AWS tools catalogued and risk-classified — across an index of 43,000+ MCP servers.