List active sessions
AI agents call list_sessions to retrieve information from Shannon MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that queries and returns information about active sessions without altering state, executing code, or triggering external operations. The low severity reflects minimal blast radius—even if misused by an agent, listing sessions poses no risk of data loss, unintended execution, or financial impact.
From the tool's definition Tool name 'list_sessions' and description 'List active sessions' indicate retrieval of session information with no modification or side effects.
Attacks that exploit this kind of access
List active sessions. It is categorised as a Read tool in the Shannon MCP MCP Server, which means it retrieves data without modifying state.
Register the Shannon 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 Shannon MCP. 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 Shannon MCP server (krzemienski/shannon-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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