list_indices
AI agents call list_indices to retrieve information from Elasticsearch MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries data about available indices in an Elasticsearch cluster with no side effects. It does not modify, delete, or execute operations on data. The empty description is offset by strong contextual evidence from the server's stated purpose and sibling tools which are all read-only operations.
From the tool's definition Tool name 'list_indices' combined with sibling tools (get_index_stats, get_mappings, search) that are explicitly read-only. Server description states 'listing indices, searching, and retrieving mappings' as capabilities.
Attacks that exploit this kind of access
list_indices. It is categorised as a Read tool in the Elasticsearch MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Elasticsearch MCP Server MCP server in PolicyLayer and add a rule for list_indices: 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 Elasticsearch MCP Server. Nothing to install.
list_indices 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 list_indices 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 list_indices. 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.
list_indices is provided by the Elasticsearch MCP Server MCP server (sajitsasi/es_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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