build · Agent Planets MCP: Risk & Policy

WHAT IT DOES

What build does on Agent Planets

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

PARAMETERS

Parameter	Type	Required
`name`	string	—
`type`	string	Yes
`api_key`	string	Yes

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why build needs a policy

This tool creates new structures on a planet, which is a reversible write operation. It modifies the planet's state by adding structures but does not delete or overwrite data irreversibly, nor does it execute code or involve financial transactions. Misuse could waste limited structure slots (max 12) but blast radius is moderate.

From the tool's definition Build a structure on your planet (max 12): dome, tower, port, garden, lab, monument, market, shrine.

Risk signalsHandles credentials or secrets (api_key)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

build Rate-limited

build 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": {
    "build": {
      "limits": [
        {
          "counter": "build_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 Agent Planets, so you can run agents against it safely.

FAQ

Questions about build

What does the build tool do? +

Build a structure on your planet (max 12): dome, tower, port, garden, lab, monument, market, shrine. It is categorised as a Write tool in the Agent Planets MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does build accept? +

build accepts 3 parameters: name, type, api_key. Required: type, api_key. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on build? +

Register the Agent Planets MCP server in PolicyLayer and add a rule for build: 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 Agent Planets. Nothing to install.

What risk level is build? +

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

Can I rate-limit build? +

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

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

build is provided by the Agent Planets MCP server (https://planets.agentexchange.work/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.