AI agents call gdb_list_sessions to retrieve information from GDB MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about active GDB sessions. It performs a read-only operation that queries state without modifying, creating, deleting, or executing anything. The action is informational and non-destructive. While GDB itself is a powerful debugging tool that could be misused, this specific tool only lists sessions and poses minimal direct risk on its own.
From the tool's definition Tool name 'gdb_list_sessions' and description 'List all active GDB sessions' indicate a query/retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access gdb_list_sessions gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and GDB MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for gdb_list_sessions:
{
"version": "1",
"default": "deny",
"tools": {
"gdb_list_sessions": {}
}
}gdb_list_sessions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
List all active GDB sessions. It is categorised as a Read tool in the GDB MCP Server MCP Server, which means it retrieves data without modifying state.
Register the GDB MCP Server MCP server in PolicyLayer and add a rule for gdb_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 GDB MCP Server. Nothing to install.
gdb_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 gdb_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 gdb_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.
gdb_list_sessions is provided by the GDB MCP Server MCP server (smadi0x86/mdb-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 13 GDB MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
13 GDB MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.