AI agents call get_unique_values to retrieve information from Arcmap without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns unique values from a layer field—a read-only operation with no side effects, data modification, or destructive impact. The incomplete description does not suggest any write, execute, or delete capabilities. Risk is low since misuse would only expose existing data, not alter or destroy it.
From the tool's definition Tool name 'get_unique_values' and description 'Devuelve los valores únicos (ordenados) de un campo de una capa' (Returns the unique sorted values of a field from a layer) indicate a query operation that retrieves data without modification.
Attacks that exploit this kind of access
Devuelve los valores únicos (ordenados) de un campo de una capa. Respeta la. It is categorised as a Read tool in the Arcmap MCP Server, which means it retrieves data without modifying state.
Register the Arcmap MCP server in PolicyLayer and add a rule for get_unique_values: 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 Arcmap. Nothing to install.
get_unique_values 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 get_unique_values 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 get_unique_values. 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.
get_unique_values is provided by the Arcmap MCP server (pedralcg/arcmap-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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