Look up the full prototype of a specific NtFunction. Returns the return type, library, and all parameters with their types, direction (in/out) and optional flag. Args: function_name: Exact NtFunction name (e.g. NtCreateThreadEx). Returns: Formatted prototype with parameter details.
AI agents call get_function_prototype to retrieve information from Sysplant without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only lookup function that queries NtFunction metadata. While it supports syscall code generation on the server, the tool itself only retrieves and displays information about function signatures. There are no side effects, data modifications, or code execution triggered by this tool. Low severity because misuse (querying unintended prototypes) poses no risk—the output is passive documentation.
From the tool's definition Tool retrieves and returns function prototype information ('Look up the full prototype', 'Returns the return type, library, and all parameters').
Documented attack patterns abuse exactly the kind of access get_function_prototype gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sysplant, and nothing reaches the server without passing your rules. This is the rule we recommend for get_function_prototype:
{
"version": "1",
"default": "deny",
"tools": {
"get_function_prototype": {}
}
}get_function_prototype is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Look up the full prototype of a specific NtFunction. Returns the return type, library, and all parameters with their types, direction (in/out) and optional flag. Args: function_name: Exact NtFunction name (e.g. NtCreateThreadEx). Returns: Formatted prototype with parameter details. It is categorised as a Read tool in the Sysplant MCP Server, which means it retrieves data without modifying state.
Register the Sysplant MCP server in PolicyLayer and add a rule for get_function_prototype: 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 Sysplant. Nothing to install.
get_function_prototype 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 get_function_prototype 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 get_function_prototype. 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.
get_function_prototype is provided by the Sysplant MCP server (x42en/sysplant). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 9 Sysplant tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
9 Sysplant tools catalogued and risk-classified — across an index of 42,500+ MCP servers.