gdb_spawn · GDB Lite MCP: Risk & Policy

WHAT IT DOES

What gdb_spawn does on GDB Lite MCP

AI agents invoke gdb_spawn to trigger actions in GDB Lite MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why gdb_spawn needs a policy

This tool triggers external operations (GDB session execution) whose effects depend on arguments (choice of program, attach mode, remote target). While it doesn't directly delete data, it starts a debugger that can execute arbitrary code in the target program. This is Execute-category because it runs external operations with argument-dependent side effects.

From the tool's definition Tool enables spawning GDB sessions with support for 'local programs', 'attach', 'remote targets', and 'extra native gdb args'. GDB is a debugger that executes code inspection and can trigger execution of target programs.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

gdb_spawn Rate-limited

gdb_spawn stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gdb_spawn": {
      "limits": [
        {
          "counter": "gdb_spawn_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches GDB Lite MCP, so you can run agents against it safely.

FAQ

Questions about gdb_spawn

What does the gdb_spawn tool do? +

Start a gdb session and return a session id. Supports local programs, core files, attach, remote targets, and extra native gdb args. It is categorised as a Execute tool in the GDB Lite MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on gdb_spawn? +

Register the GDB Lite MCP server in PolicyLayer and add a rule for gdb_spawn: 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 Lite MCP. Nothing to install.

What risk level is gdb_spawn? +

gdb_spawn is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit gdb_spawn? +

Yes. Add a rate_limit block to the gdb_spawn 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.

How do I block gdb_spawn completely? +

Set action: deny in the PolicyLayer policy for gdb_spawn. 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.

What MCP server provides gdb_spawn? +

gdb_spawn is provided by the GDB Lite MCP server (mort2000/gdb-lite-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.