platform_graphql · Zion MCP: Risk & Policy

WHAT IT DOES

What platform_graphql does on Zion

AI agents invoke platform_graphql to trigger actions in Zion. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

PARAMETERS

Parameter	Type	Required	Description
`query`	string	Yes
`variables`	object	—

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why platform_graphql needs a policy

A raw GraphQL passthrough allows arbitrary queries and mutations to be sent to the platform backend. While reads are possible, GraphQL mutations can create, modify, or delete projects, accounts, and publishing configurations.

From the tool's definition Guarded raw GraphQL passthrough to the platform backend (projects, accounts, publishing — the editor/meta API, not the deployed runtime)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

platform_graphql Rate-limited

platform_graphql stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "platform_graphql": {
      "limits": [
        {
          "counter": "platform_graphql_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 platform_graphql

What does the platform_graphql tool do? +

Guarded raw GraphQL passthrough to the platform backend (projects, accounts, publishing — the editor/meta API, not the deployed runtime). It is categorised as a Execute tool in the Zion MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

What parameters does platform_graphql accept? +

platform_graphql accepts 2 parameters: query, variables. Required: query. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on platform_graphql? +

Register the Zion MCP server in PolicyLayer and add a rule for platform_graphql: 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 platform_graphql? +

platform_graphql is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit platform_graphql? +

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

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

platform_graphql 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.