declare_type adds #pragma pack(push, 2) and #pragma pack(pop)

00000000 struct Skeleton // sizeof=0x50
00000000 {
00000000     MATRIX relative;
00000020     MATRIX absolute;
00000040     __int16 update;
00000042     // padding byte
00000043     // padding byte
00000044     struct Skeleton *super;
00000048     struct Skeleton *sub;
0000004C     struct Skeleton *next;
00000050 };

$ curl -s -X POST http://127.0.0.1:13338/mcp \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "declare_type",
      "arguments": {
        "decls": "struct Skeleton { MATRIX relative; MATRIX absolute; __int16 update; struct Skeleton *super; struct Skeleton *sub; struct Skeleton *next; };"
      }
    }
  }'

{"jsonrpc": "2.0", "result": {"content": [{"type": "text", "text": "[{\"decl\":\"struct Skeleton { MATRIX relative; MATRIX absolute; __int16 update; struct Skeleton *super; struct Skeleton *sub; struct Skeleton *next; };\"}]"}], "structuredContent": {"result": [{"decl": "struct Skeleton { MATRIX relative; MATRIX absolute; __int16 update; struct Skeleton *super; struct Skeleton *sub; struct Skeleton *next; };"}]}, "isError": false}, "id": 1}

00000000 #pragma pack(push, 2)
00000000 struct Skeleton // sizeof=0x4E
00000000 {
00000000     MATRIX relative;
00000020     MATRIX absolute;
00000040     __int16 update;
00000042     struct Skeleton *super;
00000046     struct Skeleton *sub;
0000004A     struct Skeleton *next;
0000004E };
0000004E #pragma pack(pop)