describe_fields

List all available fields for an entity type, including enums, statuses, and custom field support. Use this to discover what data you can read/write before creating or updating records.

SERVERStarfield SOURCE@adrata/starfield-mcp

Low RISK CLASS

Category Read

Parameters 11 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/adrata-starfield-mcp/describe-fields.md

WHAT IT DOES

What describe_fields does on Starfield

AI agents call describe_fields to retrieve information from Starfield without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`entity`	string	Yes	Entity type to describe

Parameters from the server's own tool schema.

RISK

Why describe_fields is rated Low

Even though describe_fields only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs describe_fields safely

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

describe_fields Allowed

describe_fields is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "describe_fields": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about describe_fields

What does the describe_fields tool do? +

List all available fields for an entity type, including enums, statuses, and custom field support. Use this to discover what data you can read/write before creating or updating records. It is categorised as a Read tool in the Starfield MCP Server, which means it retrieves data without modifying state.

What parameters does describe_fields accept? +

describe_fields accepts 1 parameter: entity. Required: entity. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on describe_fields? +

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

What risk level is describe_fields? +

describe_fields is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit describe_fields? +

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

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

describe_fields is provided by the Starfield MCP server (@adrata/starfield-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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