Get index mapping
AI agents call get_mapping to retrieve information from mcp-OpenSearch without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves schema/mapping information from an OpenSearch index without modifying data or triggering external operations. It is a read-only query operation with minimal blast radius if misused by an AI agent—the worst outcome would be information disclosure about index structure.
From the tool's definition Tool name 'get_mapping' and description 'Get index mapping' indicate a retrieval operation. The server description lists this under 'Index Management Tools' alongside 'List all indices' and 'Get index settings', which are query/read operations.
Attacks that exploit this kind of access
Get index mapping. It is categorised as a Read tool in the mcp-OpenSearch MCP Server, which means it retrieves data without modifying state.
Register the mcp-OpenSearch MCP server in PolicyLayer and add a rule for get_mapping: 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 mcp-OpenSearch. Nothing to install.
get_mapping 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_mapping 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_mapping. 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_mapping is provided by the mcp-OpenSearch MCP server (showjason/opensearch-mcp-server). 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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