Lista todos los campos de un FeatureLayer con nombre, tipo y alias.
AI agents call fl_fields to retrieve information from ArcGIS MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and lists field metadata from a FeatureLayer. The operation is read-only with no side effects—it queries field definitions and returns information about field names, types, and aliases. There is no data creation, modification, deletion, code execution, or financial impact. This is a straightforward data retrieval operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'fl_fields' and description 'Lista todos los campos de un FeatureLayer con nombre, tipo y alias' (Lists all fields of a FeatureLayer with name, type and alias) indicate a retrieval operation that returns metadata about feature layer fields without…
Attacks that exploit this kind of access
Lista todos los campos de un FeatureLayer con nombre, tipo y alias. It is categorised as a Read tool in the ArcGIS MCP MCP Server, which means it retrieves data without modifying state.
Register the ArcGIS MCP server in PolicyLayer and add a rule for fl_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 ArcGIS MCP. Nothing to install.
fl_fields is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the fl_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.
Set action: deny in the PolicyLayer policy for fl_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.
fl_fields is provided by the ArcGIS MCP server (renemorenow/arcgis-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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