• There are 939 files with units, with 212,420 lines of code.
• 3 very complex files (McCabe index sum 251+; 4,898 lines of code)
• 29 complex files (McCabe index sum 126-250; 35,716 lines of code)
• 101 medium complex files (McCabe index sum 51-125; 51,324 lines of code)
• 137 slightly complex files (McCabe index sum 26-50; 38,602 lines of code)
• 669 simple files (McCabe index sum 1-25; 81,880 lines of code)
• 361 main files have no units (e.g. languages without unit analysis, or files without functions) and are not classified.

The McCabe index of a file grows with its size: per 100 lines tells a large but plain file from a dense one, and most complex unit whether the complexity sits in one unit or is spread over many.

File	# lines	# units	McCabe index (sum)	per 100 lines	most complex unit
chatRecordingService.ts in packages/core/src/services	1429	39	262	18	117
vim-buffer-actions.ts in packages/cli/src/ui/components/shared	1602	4	261	16	246
mcp-client.ts in packages/core/src/tools	1867	57	258	14	36
geminiChat.ts in packages/core/src/core	1466	26	243	17	49
test-rig.ts in packages/test-utils/src	1427	47	230	16	25
shell.ts in packages/core/src/tools	1092	19	230	21	126
extension-manager.ts in packages/cli/src/config	1273	38	216	17	47
vim.ts in packages/cli/src/ui/hooks	1226	2	214	17	210
commandSafety.ts in packages/core/src/sandbox/utils	690	12	212	31	94
shell-utils.ts in packages/core/src/utils	944	30	211	22	19
text-buffer.ts in packages/cli/src/ui/components/shared	3621	29	209	6	68
sandbox.ts in packages/cli/src/utils	1152	13	206	18	146
memoryService.ts in packages/core/src/services	1212	41	196	16	19
config.ts in packages/core/src/config	3474	54	191	5	22
memory.ts in packages/core/src/commands	1069	37	190	18	22
policy-engine.ts in packages/core/src/policy	883	10	187	21	62
local-executor.ts in packages/core/src/agents	1256	25	182	14	34
acpSession.ts in packages/cli/src/acp	1353	27	182	13	51
shellExecutionService.ts in packages/core/src/services	1659	28	177	11	36
eval-analysis.ts in scripts/utils	613	45	176	29	10
settings.ts in packages/cli/src/config	1132	33	171	15	38
activityLogger.ts in packages/cli/src/utils	868	24	168	19	35
task.ts in packages/a2a-server/src/agent	1119	28	166	15	25
gemini.tsx in packages/cli/src	958	13	161	17	79
edit.ts in packages/core/src/tools	1240	32	156	13	18
fileUtils.ts in packages/core/src/utils	640	21	153	24	26
metrics.ts in packages/core/src/telemetry	1406	47	152	11	13
App.tsx in packages/devtools/client/src	1782	13	147	8	56
models.ts in packages/core/src/config	527	19	134	25	45
config.ts in packages/a2a-server/src/config	620	18	132	21	23
paths.ts in packages/core/src/utils	542	21	129	24	31
sessionSummaryUtils.ts in packages/core/src/services	472	18	126	27	21
scheduler.ts in packages/core/src/scheduler	872	21	118	14	27
nonInteractiveCliAgentSession.ts in packages/cli/src	601	5	118	20	53
settings.ts in packages/a2a-server/src/config	909	17	118	13	32
executor.ts in packages/a2a-server/src/agent	848	20	117	14	58
retry.ts in packages/core/src/utils	451	7	116	26	54
web-fetch.ts in packages/core/src/tools	811	23	113	14	18
client.ts in packages/core/src/core	1098	27	113	10	36
browserManager.ts in packages/core/src/agents/browser	662	19	112	17	28
registry.ts in packages/core/src/agents	595	28	112	19	22
oauth2.ts in packages/core/src/code_assist	736	18	111	15	22
config.ts in packages/core/src/policy	700	13	111	16	46
grep.ts in packages/core/src/tools	653	13	109	17	22
sandboxUtils.ts in packages/cli/src/utils	352	11	109	31	30
VirtualizedList.tsx in packages/cli/src/ui/components/shared	678	2	108	16	105
memoryPatchUtils.ts in packages/core/src/services	670	35	107	16	11
extensionsCommand.ts in packages/cli/src/ui/commands	815	17	104	13	16
security.ts in packages/core/src/utils	588	14	103	18	28
contextCompressionService.ts in packages/core/src/context	447	9	101	23	57

• File complexity is the sum of the McCabe indexes (conditional complexity) of the units (methods, functions...) in a file.
• Files are classified in five categories based on that sum: 1-25 (simple files), 26-50 (slightly complex files), 51-125 (medium complex files), 126-250 (complex files), 251+ (very complex files). The default bands are five times the unit complexity bands, as a file is a group of units.
• Only main code files with units are classified. Files without units (languages without unit analysis, or files without functions) have no complexity to measure and are left out rather than counted as simple.
• A very complex file holds many decisions, which often means it has too many responsibilities: a candidate to split, and a place where changes need more testing.