find-cspawngroupmgrgamesystem-getspawngroups

name	find-CSpawnGroupMgrGameSystem_GetSpawnGroups
description	Find and identify the CSpawnGroupMgrGameSystem_GetSpawnGroups function in CS2 binary using IDA Pro MCP. Use this skill when reverse engineering CS2 server.dll or libserver.so to locate the GetSpawnGroups function by searching for known format string references and analyzing cross-references.
disable-model-invocation	true

Find CSpawnGroupMgrGameSystem_GetSpawnGroups

Locate CSpawnGroupMgrGameSystem_GetSpawnGroups in CS2 server.dll or libserver.so using IDA Pro MCP tools.

Method

1. Search for the format string:

   mcp__ida-pro-mcp__find_regex pattern="%d spawn groups"
   

2. Get cross-references to the string:

   mcp__ida-pro-mcp__xrefs_to addrs="<string_addr>"
   

3. Decompile the referencing function:

   mcp__ida-pro-mcp__decompile addr="<function_addr>"
   

4. Identify CSpawnGroupMgrGameSystem_GetSpawnGroups by looking for this code pattern in the decompiled function:

   sub_XXXXX(a1, &v_count);
   IsChannelEnabled = LoggingSystem_IsChannelEnabled(..., 2LL);
   v4 = v_count;
   if ( IsChannelEnabled )
     LoggingSystem_Log(..., 2LL, "%d spawn groups:\n", v_count);
   

   The sub_XXXXX(a1, &v_count) call immediately before the "%d spawn groups:\n" log is CSpawnGroupMgrGameSystem_GetSpawnGroups.

5. Rename the function:

   mcp__ida-pro-mcp__rename batch={"func": [{"addr": "<GetSpawnGroups_addr>", "name": "CSpawnGroupMgrGameSystem_GetSpawnGroups"}]}
   

6. Generate and validate unique signature:

   ALWAYS Use SKILL /generate-signature-for-function to generate a robust and unique signature for CSpawnGroupMgrGameSystem_GetSpawnGroups.

7. Write IDA analysis output as YAML beside the binary:

   ALWAYS Use SKILL /write-func-as-yaml to write the analysis results for CSpawnGroupMgrGameSystem_GetSpawnGroups.

   Required parameters:

   • func_name: CSpawnGroupMgrGameSystem_GetSpawnGroups
   • func_addr: The function address from step 5
   • func_sig: The validated signature from step 6

Signature Pattern

The function is called right before a logging call with format string:

%d spawn groups:\n

Source file: game\shared\spawngroupmgrgamesystem.cpp

Function Characteristics

• Parameters: (this, &out_spawn_group_ids) where this is CSpawnGroupMgrGameSystem pointer, out_spawn_group_ids is a pointer to an output structure receiving spawn group count and ID array
• Purpose: Retrieves the list of spawn group IDs managed by the spawn group manager game system
• Not a virtual function: This is a regular member function, no vtable lookup needed

Output YAML Format

The output YAML filename depends on the platform:

• server.dll → CSpawnGroupMgrGameSystem_GetSpawnGroups.windows.yaml
• libserver.so → CSpawnGroupMgrGameSystem_GetSpawnGroups.linux.yaml