Close a wrapper-managed target session and remove its diagnostics record.
AI agents call stdio_mcp_close_session to permanently remove resources in MCP Stdio Wrapper — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The tool closes a session AND removes its diagnostics record, which is an irreversible deletion of diagnostic data. While closing a session could be considered Execute, the explicit removal of the diagnostics record constitutes irreversible data destruction, warranting the Destructive category. Severity is medium as it affects session state and diagnostic history but is limited in blast radius to development tooling.
From the tool's definition Close a wrapper-managed target session and remove its diagnostics record
Attacks that exploit this kind of access
Close a wrapper-managed target session and remove its diagnostics record. It is categorised as a Destructive tool in the MCP Stdio Wrapper MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the MCP Stdio Wrapper MCP server in PolicyLayer and add a rule for stdio_mcp_close_session: 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 MCP Stdio Wrapper. Nothing to install.
stdio_mcp_close_session is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the stdio_mcp_close_session 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 stdio_mcp_close_session. 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.
stdio_mcp_close_session is provided by the MCP Stdio Wrapper MCP server (joshuagreeff/mcp-stdio-wrapper). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
stdio_mcp_close_session is one line of MCP Stdio Wrapper's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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