AI agents call raster_index 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.
Based on the name and the pattern of sibling tools which are predominantly Read operations (list, describe, count, view), 'raster_index' most likely retrieves or indexes raster data without modifying it. The empty description prevents higher confidence, but the naming convention and context strongly suggest a retrieval operation rather than modification, execution, or destruction.
From the tool's definition Tool name 'raster_index' suggests querying or listing raster data indices. Description is empty, limiting certainty. Sibling tools like 'list_layers', 'describe_data', and 'count_features' are Read operations, suggesting this follows the same pattern.
Attacks that exploit this kind of access
raster_index. 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 raster_index: 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.
raster_index 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 raster_index 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 raster_index. 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.
raster_index 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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