AI agents invoke gdb_step to trigger actions in MCP GDB Server. 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.
gdb_step advances the execution of a program being debugged by one step. This is an Execute-class action as it actively runs/steps through code in the target process, potentially triggering side effects depending on what code is being executed. Misuse could cause a debugged process to execute unintended logic, but the blast radius is generally limited to the debugging session context.
From the tool's definition Step program execution
Documented attack patterns abuse exactly the kind of access gdb_step 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_step:
{
"version": "1",
"default": "deny",
"tools": {
"gdb_step": {
"limits": [
{
"counter": "gdb_step_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}gdb_step 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.
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Step program execution. It is categorised as a Execute tool in the MCP GDB Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the MCP GDB Server MCP server in PolicyLayer and add a rule for gdb_step: 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_step is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the gdb_step 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_step. 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_step 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.
Free to start. No card required.
17 MCP GDB Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.