• There are 223 files with units, with 49,267 lines of code.
• 7 very complex files (McCabe index sum 251+; 11,436 lines of code)
• 13 complex files (McCabe index sum 126-250; 9,470 lines of code)
• 45 medium complex files (McCabe index sum 51-125; 14,931 lines of code)
• 40 slightly complex files (McCabe index sum 26-50; 6,706 lines of code)
• 118 simple files (McCabe index sum 1-25; 6,724 lines of code)
• 33 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
server.cjs in plugins/tunnel-mcp/mcp	2290	132	757	33	32
config.go in pkg/runtimeconfig	2401	91	614	26	54
manager.go in pkg/codexplugin	1902	70	457	24	36
localproxy.go in pkg/localproxy	1509	66	364	24	22
session.go in pkg/codexplugin/session	1363	85	322	24	28
serialized_forwarding_transport.go in pkg/mcpclient	786	51	294	37	38
server.go in pkg/runtimeharpoon	1185	55	256	22	27
processor.go in pkg/dispatcher/internal	1110	31	243	22	41
template.go in pkg/runtimeharpoon	637	23	242	38	52
log_export.go in pkg/adminui	1024	58	235	23	16
tunnel_service_client.go in pkg/controlplane/internal	983	43	230	23	35
bridge.go in pkg/codexappserver	1318	39	229	17	36
registry.go in pkg/runtimeharpoon	633	29	183	29	38
protocol_observation.go in pkg/mcpclient	551	26	170	31	20
file_config.go in pkg/runtimeconfig	626	20	161	26	23
codexplugin.go in pkg/codexplugin	630	37	158	25	11
stdio_preflight.go in cmd/client	430	25	148	34	19
codex_assistant_command.go in cmd/client	669	30	144	22	30
template_body.go in pkg/runtimeharpoon	278	7	132	47	36
fxmodule.go in pkg/mcpclient	581	21	130	22	17
host_registration.go in pkg/runtimeharpoon	486	18	113	23	26
header_rules_config.go in pkg/runtimeconfig	366	17	111	30	11
supervisor.go in pkg/cloudflared/runtime	459	21	106	23	14
health.go in pkg/runtimehealth	396	16	105	27	20
checker.go in pkg/proxyhealth	497	27	103	21	14
hostbundle.go in pkg/oauth	405	23	103	25	10
inmemory_transport.go in pkg/runtimeharpoon	360	25	103	29	10
template_server.go in pkg/runtimeharpoon	411	12	98	24	20
doctor_command.go in cmd/client	634	17	97	15	13
codex_command.go in cmd/client	610	20	96	16	21
header_rules.go in pkg/runtimeharpoon	257	10	96	37	34
generate_release_evidence.py in scripts	376	14	94	25	34
tunnels_command.go in cmd/client/admin	480	20	93	19	12
state.go in pkg/codexplugin/state	390	28	92	24	12
codex.go in pkg/adminui	449	22	90	20	11
health_command.go in cmd/client	404	14	89	22	9
health.go in pkg/controlplane	320	31	80	25	8
mcp_tunnel_client_proxy.ts in wrappers/mcp-tunnel-client-proxy/typescript	336	21	72	21	8
forwarding_transport_impl.go in pkg/mcpclient	216	12	72	33	23
log_buffer.go in pkg/adminui	337	15	72	21	11
route.go in pkg/proxy	275	12	70	25	14
tunnel_failure.go in pkg/dispatcher/internal	267	9	70	26	24
server.go in pkg/harpoon	285	17	69	24	14
stdio_command.go in pkg/mcpclient	322	17	69	21	9
fxmodule.go in pkg/controlplane/fx	374	14	69	18	11
profiles_command.go in cmd/client	342	12	66	19	13
catalog_digest.go in pkg/runtimeharpoon	300	16	66	22	10
components.go in pkg/runtimehealth	197	6	65	33	28
poller.go in pkg/controlplane/internal	320	10	65	20	30
resource_meta.go in pkg/oauth	316	12	64	20	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.