Retrieves index mapping and setting information for an index in OpenSearch.
AI agents call IndexMappingTool to retrieve information from Opensearch without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata (mappings and settings) from an OpenSearch index. The verb 'retrieves' is unambiguously read-only—it does not create, modify, delete, or execute operations. Even if an agent misuses it, the blast radius is minimal as it only exposes schema information already known to users with cluster access.
From the tool's definition Tool name 'IndexMappingTool' and description 'Retrieves index mapping and setting information' indicate a read-only operation that queries and returns existing index metadata without modification.
Attacks that exploit this kind of access
Retrieves index mapping and setting information for an index in OpenSearch. It is categorised as a Read tool in the Opensearch MCP Server, which means it retrieves data without modifying state.
Register the Opensearch MCP server in PolicyLayer and add a rule for IndexMappingTool: 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 Opensearch. Nothing to install.
IndexMappingTool 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 IndexMappingTool 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 IndexMappingTool. 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.
IndexMappingTool is provided by the Opensearch MCP server (rithinpullela/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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