oppi.li
source dump of claude code
1// Critical system constants extracted to break circular dependencies
2
3import { feature } from 'bun:bundle'
4import { getFeatureValue_CACHED_MAY_BE_STALE } from '../services/analytics/growthbook.js'
5import { logForDebugging } from '../utils/debug.js'
6import { isEnvDefinedFalsy } from '../utils/envUtils.js'
7import { getAPIProvider } from '../utils/model/providers.js'
8import { getWorkload } from '../utils/workloadContext.js'
9
10const DEFAULT_PREFIX = `You are Claude Code, Anthropic's official CLI for Claude.`
11const AGENT_SDK_CLAUDE_CODE_PRESET_PREFIX = `You are Claude Code, Anthropic's official CLI for Claude, running within the Claude Agent SDK.`
12const AGENT_SDK_PREFIX = `You are a Claude agent, built on Anthropic's Claude Agent SDK.`
13
14const CLI_SYSPROMPT_PREFIX_VALUES = [
15 DEFAULT_PREFIX,
16 AGENT_SDK_CLAUDE_CODE_PRESET_PREFIX,
17 AGENT_SDK_PREFIX,
18] as const
19
20export type CLISyspromptPrefix = (typeof CLI_SYSPROMPT_PREFIX_VALUES)[number]
21
22/**
23 * All possible CLI sysprompt prefix values, used by splitSysPromptPrefix
24 * to identify prefix blocks by content rather than position.
25 */
26export const CLI_SYSPROMPT_PREFIXES: ReadonlySet<string> = new Set(
27 CLI_SYSPROMPT_PREFIX_VALUES,
28)
29
30export function getCLISyspromptPrefix(options?: {
31 isNonInteractive: boolean
32 hasAppendSystemPrompt: boolean
33}): CLISyspromptPrefix {
34 const apiProvider = getAPIProvider()
35 if (apiProvider === 'vertex') {
36 return DEFAULT_PREFIX
37 }
38
39 if (options?.isNonInteractive) {
40 if (options.hasAppendSystemPrompt) {
41 return AGENT_SDK_CLAUDE_CODE_PRESET_PREFIX
42 }
43 return AGENT_SDK_PREFIX
44 }
45 return DEFAULT_PREFIX
46}
47
48/**
49 * Check if attribution header is enabled.
50 * Enabled by default, can be disabled via env var or GrowthBook killswitch.
51 */
52function isAttributionHeaderEnabled(): boolean {
53 if (isEnvDefinedFalsy(process.env.CLAUDE_CODE_ATTRIBUTION_HEADER)) {
54 return false
55 }
56 return getFeatureValue_CACHED_MAY_BE_STALE('tengu_attribution_header', true)
57}
58
59/**
60 * Get attribution header for API requests.
61 * Returns a header string with cc_version (including fingerprint) and cc_entrypoint.
62 * Enabled by default, can be disabled via env var or GrowthBook killswitch.
63 *
64 * When NATIVE_CLIENT_ATTESTATION is enabled, includes a `cch=00000` placeholder.
65 * Before the request is sent, Bun's native HTTP stack finds this placeholder
66 * in the request body and overwrites the zeros with a computed hash. The
67 * server verifies this token to confirm the request came from a real Claude
68 * Code client. See bun-anthropic/src/http/Attestation.zig for implementation.
69 *
70 * We use a placeholder (instead of injecting from Zig) because same-length
71 * replacement avoids Content-Length changes and buffer reallocation.
72 */
73export function getAttributionHeader(fingerprint: string): string {
74 if (!isAttributionHeaderEnabled()) {
75 return ''
76 }
77
78 const version = `${MACRO.VERSION}.${fingerprint}`
79 const entrypoint = process.env.CLAUDE_CODE_ENTRYPOINT ?? 'unknown'
80
81 // cch=00000 placeholder is overwritten by Bun's HTTP stack with attestation token
82 const cch = feature('NATIVE_CLIENT_ATTESTATION') ? ' cch=00000;' : ''
83 // cc_workload: turn-scoped hint so the API can route e.g. cron-initiated
84 // requests to a lower QoS pool. Absent = interactive default. Safe re:
85 // fingerprint (computed from msg chars + version only, line 78 above) and
86 // cch attestation (placeholder overwritten in serialized body bytes after
87 // this string is built). Server _parse_cc_header tolerates unknown extra
88 // fields so old API deploys silently ignore this.
89 const workload = getWorkload()
90 const workloadPair = workload ? ` cc_workload=${workload};` : ''
91 const header = `x-anthropic-billing-header: cc_version=${version}; cc_entrypoint=${entrypoint};${cch}${workloadPair}`
92
93 logForDebugging(`attribution header ${header}`)
94 return header
95}