AI agents call gdb_list_sessions to retrieve information from MCP GDB Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns information about active debugging sessions. It performs no side effects, does not execute code, does not modify data, and does not delete anything. It is a pure read operation that lists existing state.
From the tool's definition Tool name 'gdb_list_sessions' and description 'List all active GDB sessions' indicate a retrieval operation with no modification of state or execution of arbitrary commands.
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 MCP GDB 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.
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List all active GDB sessions. It is categorised as a Read tool in the MCP GDB Server MCP Server, which means it retrieves data without modifying state.
Register the MCP GDB 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 MCP GDB 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 MCP GDB Server MCP server (signal-slot/mcp-gdb). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 17 MCP GDB Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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17 MCP GDB Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.