AI agents call list_items to retrieve information from MCP Proxy without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and filters items from a list without creating, modifying, or deleting data. The use of 'optional filtering' suggests parameter-based querying rather than side effects.
From the tool's definition Tool name 'list_items' combined with description 'Process a list of items with optional filtering' indicates a retrieval and query operation. The verb 'list' and 'filtering' are characteristic of Read operations that inspect data without modification.
Attacks that exploit this kind of access
Process a list of items with optional filtering. It is categorised as a Read tool in the MCP Proxy MCP Server, which means it retrieves data without modifying state.
Register the MCP Proxy MCP server in PolicyLayer and add a rule for list_items: 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 Proxy. Nothing to install.
list_items 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_items 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_items. 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_items is provided by the MCP Proxy MCP server (lizthedeveloper/mcp_proxy). 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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