List all keys in the store.
AI agents call list_keys to retrieve information from Simple 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 metadata about the key-value store (the list of keys) without creating, modifying, or deleting any data. It is a read-only query operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name is 'list_keys' and description states it 'List all keys in the store' — a pure retrieval operation with no side effects.
Attacks that exploit this kind of access
List all keys in the store. It is categorised as a Read tool in the Simple MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Simple MCP Server MCP server in PolicyLayer and add a rule for list_keys: 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 Simple MCP Server. Nothing to install.
list_keys 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_keys 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_keys. 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_keys is provided by the Simple MCP Server MCP server (jmgress/simple-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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