AI agents call list_sessions to retrieve information from Claude without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a query/retrieval operation on stored session data, returning a list of past sessions organized by project with summaries. It has no side effects, does not modify or delete data, and does not execute external operations. It is a pure read operation typical of data retrieval functions.
From the tool's definition Tool name 'list_sessions' and description 'Lista sesiones pasadas por proyecto con resumen' indicate the tool retrieves and lists historical session data with summaries.
Attacks that exploit this kind of access
Lista sesiones pasadas por proyecto con resumen. It is categorised as a Read tool in the Claude MCP Server, which means it retrieves data without modifying state.
Register the Claude 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 Claude. 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 Claude MCP server (zcc-cddg-mx/mcp-server-claude). 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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