AI agents call list_sessions to retrieve information from Handoff without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or enumerates existing session records (LLM, timestamp, task summary) for informational purposes only. It has no side effects, performs no destructive operations, and does not modify or create data. The blast radius of misuse is minimal—an agent listing sessions could not cause harm beyond potentially viewing session metadata. This is a straightforward Read operation.
From the tool's definition Tool name 'list_sessions' with description 'List all saved sessions for a project' indicates a retrieval operation that queries and returns session data without modification, deletion, or execution.
Attacks that exploit this kind of access
List all saved sessions for a project with their LLM, timestamp, and task summary. It is categorised as a Read tool in the Handoff MCP Server, which means it retrieves data without modifying state.
Register the Handoff MCP server in PolicyLayer and add a rule for list_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 Handoff. Nothing to install.
list_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_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_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_sessions is provided by the Handoff MCP server (juan-severiano/handoff-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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