• There are 307 files with 39,000 lines of code.
• 4 very long files (7,991 lines of code)
• 11 long files (7,621 lines of code)
• 33 medium size files (9,839 lines of code)
• 53 small files (7,655 lines of code)
• 206 very small files (5,894 lines of code)

File	# lines	≈ tokens to read	# changes (1y)	≈ lines edited per change	lines read per line changed
messages.ts in src/resources/beta/messages	2799	~15k–50k	81	~100	~30
messages.ts in src/resources/messages	2008	~10k–30k	66	~70	~30
beta.ts in src/resources/beta	1583	~10k–30k	67	~20	~70
client.ts in src	1601	~10k–30k	64	~50	~30
index.ts in src/resources/beta	728	~5k–15k	55	~20	~30
events.ts in src/resources/beta/sessions	934	~5k–15k	31	~100	~7
sessions.ts in src/resources/beta/sessions	701	~3k–10k	33	~70	~10
agents.ts in src/resources/beta/agents	683	~3k–10k	31	~70	~7
BetaToolRunner.ts in src/lib/tools	649	~3k–10k	25	~100	~7
index.ts in src/resources/beta/messages	360	~2k–7k	35	~10	~30
BetaMessageStream.ts in src/lib	650	~3k–10k	18	~70	~10
node.ts in src/tools/agent-toolset	771	~5k–15k	12	~100	~7
index.ts in src/resources	316	~2k–5k	26	~10	~30
batches.ts in src/resources/beta/messages	255	~1.5k–5k	28	~50	~5
organization.ts in src/resources/beta/organization	495	~3k–7k	14	~50	~7
middleware.ts in src/lib	657	~3k–10k	10	~100	~5
index.ts in src/resources/messages	278	~1.5k–5k	22	~7	~30
credentials.ts in src/resources/beta/vaults	413	~2k–7k	14	~100	~5
deployments.ts in src/resources/beta	418	~2k–7k	12	~100	~3
MessageStream.ts in src/lib	604	~3k–10k	8	~70	~10

Tokens are lines × 7 to 14 (analysis.fileReadsForChanges). Lines edited per change are the file's lines added and deleted divided by its commits over the whole history. Agents read about 2,000 lines at a time: when a 17,000-line file was split into modules, the tokens an agent read for the same change fell by 83% (The Economic Benefit of Refactoring, 2026).

There are 30 files with lines longer than 120 characters. In total, there are 83 long lines.

File	# lines	# units	# long lines
beta.ts in src/resources/beta	1583	-	14
deployments.ts in src/resources/beta	418	8	13
client.ts in packages/vertex-sdk/src	178	9	5
middleware.ts in src/lib	657	25	5
types.ts in src/internal	48	1	4
client.ts in packages/google-cloud-sdk/src	196	8	3
node.ts in src/tools/memory	308	14	3
client.ts in src	1601	32	3
client.ts in packages/foundry-sdk/src	103	5	2
mantle-client.ts in packages/bedrock-sdk/src	135	6	2
messages.ts in src/resources/beta/messages	2799	4	2
credentials.ts in src/resources/beta/vaults	413	7	2
vaults.ts in src/resources/beta/vaults	260	6	2
messages.ts in src/resources/messages	2008	2	2
uploads.ts in src/internal	174	3	2
shims.ts in src/internal	74	9	2
worker.ts in src/lib/environments	469	14	2
standard-schema.ts in src/lib	111	4	2
oidc-federation.ts in src/lib/credentials	97	1	2
auth.ts in packages/bedrock-sdk/src/core	100	1	1
client.ts in packages/bedrock-sdk/src	191	7	1
auth.ts in packages/aws-sdk/src/core	105	-	1
client.ts in packages/aws-sdk/src	201	9	1
mjs eslint.config.mjs in root	69	-	1
node.ts in src/tools/agent-toolset	771	34	1
streaming.ts in src/core	301	14	1
deployment-runs.ts in src/resources/beta	194	2	1
jsonl.ts in src/internal/decoders	41	2	1
BetaMessageStream.ts in src/lib	650	28	1
credential-chain.ts in src/lib/credentials	194	6	1

• File size measurements show the distribution of size of files.
• Files are classified in four categories based on their size (lines of code): 1-100 (very small files), 101-200 (small files), 201-500 (medium size files), 501-1000 (long files), 1001+(very long files).
• It is a good practice to keep files small. Long files may become "bloaters", code that have increased to such gargantuan proportions that they are hard to work with.