json_type

Get the type of JSON value at path. Args: key: The name of the key path: The path in the JSON document (optional, defaults to root) Returns: JSON type or error message

ServerAWS
CategoryRead

How to control json_type ↓

WHAT IT DOES

What json_type does on AWS

AI agents call json_type 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.

THE RISK

Low Risk

Why json_type needs a policy

This tool only reads and returns the type of a JSON value at a specified path. It performs no writes, executions, or deletions. The blast radius if misused is minimal as it only exposes type metadata.

From the tool's definition "Get the type of JSON value at path" — purely retrieves type information, no side effects

Risk signalsAdmin/system-level operation

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

POLICY

How to control json_type

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_type:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "json_type": {}
  }
}

json_type is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

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EXPLORE

Related tools and policies

More AWS tools

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All 300 AWS tools →

Read tools on other servers

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Go deeper

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about json_type

What does the json_type tool do? +

Get the type of JSON value at path. Args: key: The name of the key path: The path in the JSON document (optional, defaults to root) Returns: JSON type or error message. It is categorised as a Read tool in the AWS MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on json_type? +

Register the AWS MCP server in PolicyLayer and add a rule for json_type: 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.

What risk level is json_type? +

json_type is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit json_type? +

Yes. Add a rate_limit block to the json_type 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_type completely? +

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

json_type 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.

Enforce policy on every AWS tool call.

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.