• There are 276 files with units, with 126,935 lines of code.
• 16 very complex files (McCabe index sum 251+; 41,257 lines of code)
• 28 complex files (McCabe index sum 126-250; 31,701 lines of code)
• 45 medium complex files (McCabe index sum 51-125; 25,689 lines of code)
• 45 slightly complex files (McCabe index sum 26-50; 14,113 lines of code)
• 142 simple files (McCabe index sum 1-25; 14,175 lines of code)
• 110 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
runState.ts in packages/agents-core/src	6776	154	1048	15	57
docker.ts in packages/agents-core/src/sandbox/sandboxes	5021	269	774	15	18
toolExecution.ts in packages/agents-core/src/runner	2932	74	489	17	67
sandbox.ts in packages/agents-extensions/src/sandbox/runloop	2604	197	464	18	13
blockedOutputPersistence.ts in packages/agents-core/src/runner	1926	58	462	24	39
mountSecurity.ts in packages/agents-core/src/sandbox	2130	97	445	21	28
sandbox.ts in packages/agents-extensions/src/sandbox/modal	2598	169	388	15	16
sandbox.ts in packages/agents-extensions/src/sandbox/vercel	2431	171	378	16	13
openaiResponsesConverter.ts in packages/agents-openai/src	1803	32	376	21	69
sessionPersistence.ts in packages/agents-core/src/runner	2483	94	351	14	29
openaiResponsesModel.ts in packages/agents-openai/src	2510	81	329	13	29
index.ts in packages/agents-extensions/src/experimental/codex	1611	85	311	19	18
strictToolSchema.ts in packages/agents-core/src/utils	1236	32	296	24	36
sandbox.ts in packages/agents-extensions/src/sandbox/blaxel	1676	127	295	18	10
sandbox.ts in packages/agents-extensions/src/sandbox/cloudflare	1812	118	288	16	23
node.ts in packages/agents-core/src/shims/mcp-server	1708	87	272	16	18
turnResolution.ts in packages/agents-core/src/runner	1801	37	247	14	53
run.ts in packages/agents-core/src	3410	61	241	7	119
inContainerMounts.ts in packages/agents-extensions/src/sandbox/shared	1408	79	239	17	15
index.ts in packages/agents-extensions/src/ai-sdk	1494	45	239	16	26
localWorkspace.ts in packages/agents-core/src/sandbox/sandboxes/shared	1259	91	236	19	9
sandbox.ts in packages/agents-extensions/src/sandbox/daytona	1491	112	229	15	13
unixLocal.ts in packages/agents-core/src/sandbox/sandboxes	1610	98	229	14	13
modelRetry.ts in packages/agents-core/src/runner	1352	52	219	16	23
zodJsonSchemaCompat.ts in packages/agents-core/src/utils	776	31	218	28	31
sandbox.ts in packages/agents-extensions/src/sandbox/e2b	1248	83	216	17	17
manager.ts in packages/agents-core/src/sandbox/runtime	1974	65	211	11	23
tool.ts in packages/agents-core/src	2040	50	205	10	31
mcp.ts in packages/agents-core/src	1450	53	198	14	20
messageConversion.ts in packages/agents-extensions/src/ai-sdk	784	36	190	24	26
localSnapshots.ts in packages/agents-core/src/sandbox/sandboxes/shared	834	58	165	20	11
toolSearch.ts in packages/agents-core/src/runner	808	33	164	20	28
manifest.ts in packages/agents-core/src/sandbox	1017	48	157	15	15
archive.ts in packages/agents-extensions/src/sandbox/shared	767	44	156	20	16
items.ts in packages/agents-core/src/runner	607	30	152	25	15
memorySession.ts in packages/agents-core/src/memory	399	20	142	36	31
skills.ts in packages/agents-core/src/sandbox/capabilities	689	31	142	21	22
session.ts in packages/agents-extensions/src/sandbox/shared	541	35	139	26	14
mcpServers.ts in packages/agents-core/src	695	46	137	20	12
toolOutputNormalization.ts in packages/agents-core/src/runner	340	9	133	39	40
toolIdentity.ts in packages/agents-core/src	478	33	133	28	19
scriptedModel.ts in packages/agents-core/src/testing	679	44	132	19	17
sessionBase.ts in packages/agents-extensions/src/sandbox/shared	887	89	130	15	11
mounts.ts in packages/agents-extensions/src/sandbox/blaxel	863	45	129	15	17
agentToolInput.ts in packages/agents-core/src	467	18	118	25	17
agent.ts in packages/agents-core/src	903	16	116	13	52
storage.ts in packages/agents-core/src/sandbox/memory	652	33	114	17	10
review_state.py in .agents/skills/implementation-final-review/scripts	656	31	113	17	13
openaiRealtimeBase.ts in packages/agents-realtime/src	924	21	112	12	47
localSources.ts in packages/agents-extensions/src/sandbox/shared	676	41	107	16	8

• 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.