debug_session_start

THE RISK

High Risk

Debuggers like GDB and LLDB allow stepping through code, reading/modifying memory, executing arbitrary commands in the debugged process context, and invoking functions. Starting a debug session grants code execution capabilities whose effects depend on subsequent debugger commands issued by the AI agent. This exceeds Write (reversible modifications) and qualifies as Execute.

From the tool's definition Tool description: 'Start a debugging session with GDB/LLDB'. GDB and LLDB are debuggers that permit arbitrary code execution and inspection of running processes.

Documented attack patterns abuse exactly the kind of access debug_session_start gives an agent:

HOW TO CONTROL DEBUG_SESSION_START

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Prompts Server, and nothing reaches the server without passing your rules. This is the rule we recommend for debug_session_start:

policy.json

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

debug_session_start 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.

Create a free account and register MCP Prompts Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

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All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
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FAQ

What does the debug_session_start tool do? +

Start a debugging session with GDB/LLDB. It is categorised as a Execute tool in the MCP Prompts Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on debug_session_start? +

Register the MCP Prompts Server MCP server in PolicyLayer and add a rule for debug_session_start: 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 Prompts Server. Nothing to install.

What risk level is debug_session_start? +

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

Can I rate-limit debug_session_start? +

Yes. Add a rate_limit block to the debug_session_start 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 debug_session_start completely? +

Set action: deny in the PolicyLayer policy for debug_session_start. 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 debug_session_start? +

debug_session_start is provided by the MCP Prompts Server MCP server (sparesparrow/mcp-prompts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Prompts Server tool call.

Deterministic rules across all 51 MCP Prompts Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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51 MCP Prompts Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT DEBUG_SESSION_START ON MCP PROMPTS SERVER DOES

// THE RISK

// HOW TO CONTROL DEBUG_SESSION_START

// EXPLORE