create_layer

A write tool on the Aos MCP server.

SERVERAos SOURCE@hybridlabor-api/aos

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/hybridlabor-api-aos/create-layer.md

WHAT IT DOES

What create_layer does on Aos

AI agents use create_layer to create or update resources in Aos, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Aos environment.

RISK

Why create_layer is rated Medium

Creating a layer in GeoServer adds new geospatial data structures to the system. This is a Write operation—it creates/modifies data reversibly (layers can be deleted or reconfigured). It is not Destructive (layers are not irreversibly deleted), Execute (no arbitrary code execution), or Financial.

From the tool's definition Tool name 'create_layer' indicates data creation. Context from sibling tools shows this server manipulates geospatial data via GeoServer REST API (other siblings include create_featurestore, create_datastore, create_layergroup, add_layer_to_layergroup).

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_layer safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Aos, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_layer, this is the rule to start with:

create_layer Rate-limited

create_layer 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": {
    "create_layer": {
      "limits": [
        {
          "counter": "create_layer_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Aos, apply this rule, and every create_layer call is checked against it from then on.

FAQ

Questions about create_layer

What does the create_layer tool do? +

create_layer is a write tool on the Aos MCP server. It is categorised as a Write tool in the Aos MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_layer? +

Register the Aos MCP server in PolicyLayer and add a rule for create_layer: 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 Aos. Nothing to install.

What risk level is create_layer? +

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

Can I rate-limit create_layer? +

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

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

create_layer is provided by the Aos MCP server (@hybridlabor-api/aos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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