json_numincrby · AWS HealthOmics MCP Server MCP

WHAT IT DOES

What json_numincrby does on AWS HealthOmics MCP Server

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

WHY IT NEEDS A POLICY

Why json_numincrby needs a policy

The tool modifies an existing numeric value by incrementing it, which is a reversible write operation (it changes data but doesn't irreversibly delete it). However, the tool name 'json_numincrby' and its description suggest it modifies stored JSON data. Confidence is slightly reduced because this tool seems out of place in an AWS HealthOmics MCP server, suggesting possible mislabeling or an unusual integration.

From the tool's definition Increment the number at path by value

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

json_numincrby Rate-limited

json_numincrby 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_numincrby": {
      "limits": [
        {
          "counter": "json_numincrby_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 HealthOmics MCP Server, so you can run agents against it safely.

FAQ

Questions about json_numincrby

What does the json_numincrby tool do? +

Increment the number at path by value. It is categorised as a Write tool in the AWS HealthOmics 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_numincrby? +

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

What risk level is json_numincrby? +

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

Can I rate-limit json_numincrby? +

Yes. Add a rate_limit block to the json_numincrby 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_numincrby completely? +

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

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