AI agents call list_agent_sessions to retrieve information from Waymark without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation that queries and returns information about agent sessions. It has no side effects, does not execute code, does not modify data, and does not delete anything. The blast radius of misuse is minimal—an attacker gains visibility into session metadata but cannot directly compromise systems or data through this tool alone.
From the tool's definition Tool name 'list_agent_sessions' and description 'List all currently running (and recently finished) AI agent sessions' indicate a query operation that retrieves information about sessions without modifying, executing, or deleting anything.
Attacks that exploit this kind of access
List all currently running (and recently finished) AI agent sessions on this machine. It is categorised as a Read tool in the Waymark MCP Server, which means it retrieves data without modifying state.
Register the Waymark 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 Waymark. 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 Waymark MCP server (waymarks/waymark). 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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