AI agents call list_agent_sessions to retrieve information from Lens without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
agent_id | string | Yes | Agent UUID |
Parameters from the server's own tool schema.
This tool retrieves and queries existing session metadata without creating, modifying, deleting, or executing any operations. It is a straightforward read operation on agent conversation history data with no blast radius if misused by an AI agent—at worst, an agent gains visibility into historical sessions but cannot alter them.
From the tool's definition Tool description states 'List conversation sessions for an agent' with read-only operations (shows/displays session metadata: name, message count, timestamps).
Attacks that exploit this kind of access
List conversation sessions for an agent. Shows session name (first message), message count, and timestamps. It is categorised as a Read tool in the Lens MCP Server, which means it retrieves data without modifying state.
list_agent_sessions accepts 1 parameter: agent_id. Required: agent_id. The full parameter table on this page comes from the server's own tool schema.
Register the Lens MCP server in PolicyLayer and add a rule for list_agent_sessions: 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 Lens. Nothing to install.
list_agent_sessions 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_agent_sessions 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_agent_sessions. 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_agent_sessions is provided by the Lens MCP server (lens-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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