fc_describe
AI agents call fc_describe 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.
'Describe' operations in ArcGIS typically query and return structural information about data objects (fields, geometry type, spatial reference, etc.). No evidence suggests this performs writes, deletions, code execution, or financial operations. Confidence is moderate (0.60) due to the empty description; if the tool unexpectedly executes queries or scripts, it could be Execute rather than Read.
From the tool's definition Tool name 'fc_describe' suggests describing a feature class (ArcGIS terminology), which would retrieve metadata or schema information about a feature collection or layer without modification.
Attacks that exploit this kind of access
fc_describe. 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 fc_describe: 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.
fc_describe 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 fc_describe 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 fc_describe. 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.
fc_describe 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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