type · Zion MCP: Risk & Policy

WHAT IT DOES

What type does on Zion

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

PARAMETERS

Parameter	Type	Required
`op`	string	Yes
`args`	object	—
`appExId`	string \| null	—
`projectExId`	string	—
`appVersionExId`	string \| null	—

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why type needs a policy

This tool creates or modifies type definitions and enums, which are metadata structures. While such modifications are typically reversible (can be edited again or reverted), they affect the schema and could impact dependent systems. This places it in the Write category rather than Execute or Destructive.

From the tool's definition Tool description explicitly states 'Edit enums and object/custom type definitions'. The use of 'Edit' indicates modification of data structures.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

type Rate-limited

type 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": {
    "type": {
      "limits": [
        {
          "counter": "type_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 Zion, so you can run agents against it safely.

FAQ

Questions about type

What does the type tool do? +

Edit enums and object/custom type definitions (post-type-system-refactor only). op is a schema ToolName; args is its payload. Call guide {plugin:"type"} for the rules and arg shapes. It is categorised as a Write tool in the Zion MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does type accept? +

type accepts 5 parameters: op, args, appExId, projectExId, appVersionExId. Required: op. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on type? +

Register the Zion MCP server in PolicyLayer and add a rule for 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 Zion. Nothing to install.

What risk level is type? +

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

Can I rate-limit type? +

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

Set action: deny in the PolicyLayer policy for 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 type? +

type is provided by the Zion MCP server (zion-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.