Function fetchAnthropicUsage

packages/arctic/src/provider/usage.ts:589–658

(input: {
    provider: Provider.Info
  })

  }

  async function fetchAnthropicUsage(input: {
    provider: Provider.Info
  }): Promise<Omit<Record, "providerID" | "providerName" | "fetchedAt">> {
    let token: string | undefined
    const auth = await Auth.get(input.provider.id)

    if (auth?.type === "api") {
      token = auth.key
    } else if (auth?.type === "oauth") {
      token = await ensureAnthropicAccessToken(auth, input.provider.id)
    } else if (auth?.type === "wellknown") {
      token = auth.token || auth.key
    }

    if (!token) {
      token = input.provider.key ?? input.provider.options?.apiKey
    }

    if (!token) {
      throw new Error("Anthropic authentication is required. Set an OAuth token or API key for provider 'anthropic'.")
    }

    const response = await globalThis.fetch(ANTHROPIC_OAUTH_USAGE_URL, {
      headers: {
        Authorization: `Bearer ${token}`,
        Accept: "application/json",
        "Content-Type": "application/json",
        "anthropic-beta": "oauth-2025-04-20",
        "User-Agent": "Arctic",
      },
    })

    if (!response.ok) {
      if (response.status === 401 || response.status === 403) {
        throw new Error("Authorization failed. Please check your Anthropic OAuth token.")
      }
      throw new Error(`Failed to fetch Anthropic usage: ${response.statusText}`)
    }

    const payload = (await response.json().catch(() => null)) as any
    if (!payload || typeof payload !== "object") {
      return {}
    }

    const fiveHour = payload.five_hour
    const sevenDay = payload.seven_day

    const rows = [formatAnthropicUsageRow("5-hour", fiveHour), formatAnthropicUsageRow("7-day", sevenDay)].filter(
      (row): row is string => Boolean(row),
    )

    const planType = rows.length > 0 ? `Claude subscription\n${rows.map((row) => `- ${row}`).join("\n")}` : undefined

    const primary = resolveAnthropicLimit(fiveHour, "5h")
    const secondary = resolveAnthropicLimit(sevenDay, "Weekly")

    const limitReached = [primary?.usedPercent, secondary?.usedPercent].some(
      (value) => typeof value === "number" && value >= 100,