gdb_write_register · GDB MCP Server MCP: Risk & Policy

Q: What does the gdb_write_register tool do?

修改指定寄存器的值。 参数: - register: 寄存器名称 (如 r0, pc, sp) - value: 要写入的值 (如 0x1000 或 42) 警告: 此操作可能影响程序执行状态。. It is categorised as a Execute tool in the GDB MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

WHAT IT DOES

What gdb_write_register does on GDB MCP Server

AI agents invoke gdb_write_register to trigger actions in GDB MCP 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.

WHY IT NEEDS A POLICY

Why gdb_write_register needs a policy

Writing to CPU registers (including PC, SP) directly alters the execution state of a running or paused program. This is an active intervention into program execution flow — modifying the program counter can redirect execution arbitrarily, and modifying the stack pointer can corrupt the call stack.

From the tool's definition 修改指定寄存器的值 / 警告: 此操作可能影响程序执行状态

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

gdb_write_register Rate-limited

gdb_write_register 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_write_register": {
      "limits": [
        {
          "counter": "gdb_write_register_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 MCP Server, so you can run agents against it safely.

FAQ

Questions about gdb_write_register

What does the gdb_write_register tool do? +

修改指定寄存器的值。参数: - register: 寄存器名称 (如 r0, pc, sp) - value: 要写入的值 (如 0x1000 或 42) 警告: 此操作可能影响程序执行状态。. It is categorised as a Execute tool in the GDB MCP 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 gdb_write_register? +

Register the GDB MCP Server MCP server in PolicyLayer and add a rule for gdb_write_register: 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.

What risk level is gdb_write_register? +

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

Can I rate-limit gdb_write_register? +

Yes. Add a rate_limit block to the gdb_write_register 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_write_register completely? +

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

gdb_write_register is provided by the GDB MCP Server MCP server (zjm1060/gdb-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.