CS2_VibeSignatures: Skill for Claude Code

Find CNetworkMessages_GetIsForServer

Locate CNetworkMessages_GetIsForServer vfunc in CS2 networksystem.dll or libnetworksystem.so using IDA Pro MCP tools.

Method

1. Load CNetworkMessages_SetIsForServer from YAML

ALWAYS Use SKILL /get-func-from-yaml with func_name=CNetworkMessages_SetIsForServer.

If the skill returns an error, STOP and report to user.

Otherwise, extract:

• func_va of CNetworkMessages_SetIsForServer
• vfunc_index
• vfunc_offset

2. Load CNetworkMessages VTable from YAML

ALWAYS Use SKILL /get-vtable-from-yaml with class_name=CNetworkMessages.

If the skill returns an error, STOP and report to user.

Otherwise, extract:

• vtable_numvfunc
• vtable_entries

3. Resolve the Adjacent Getter Slot

Compute the candidate slot for CNetworkMessages_GetIsForServer:

• target_vfunc_index = CNetworkMessages_SetIsForServer.vfunc_index + 1
• target_vfunc_offset = CNetworkMessages_SetIsForServer.vfunc_offset + 8

Validate that target_vfunc_index < vtable_numvfunc, then read:

• candidate_func_addr = CNetworkMessages_vtable[target_vfunc_index]

This adjacent-slot rule is required because GetIsForServer immediately follows SetIsForServer in the CNetworkMessages vtable for networksystem.dll / libnetworksystem.so.

4. Decompile the Setter and Getter Candidate

Decompile both functions:

mcp__ida-pro-mcp__decompile addr="<CNetworkMessages_SetIsForServer_func_va>"
mcp__ida-pro-mcp__decompile addr="<candidate_func_addr>"

First, confirm CNetworkMessages_SetIsForServer is the simple byte setter pattern:

void __fastcall CNetworkMessages_SetIsForServer(__int64 a1, char a2)
{
  *(_BYTE *)(a1 + 1374) = a2;
}

Windows assembly example:

mov     [rcx+55Eh], dl
retn

Then confirm the adjacent vtable entry is the matching byte getter using the same member offset:

__int64 __fastcall sub_1800CB790(__int64 a1)
{
  return *(unsigned __int8 *)(a1 + 1374);
}