Plugin for opencode to bypass anthropic auth

claudecode.ts

import type { Plugin } from "@opencode-ai/plugin"

const opencodePattern = /OpenCode|opencode/g

export const ClaudeCodePlugin: Plugin = async () => {
  return {
    "experimental.chat.system.transform": async (_ctx, data) => {
      const system = data?.system
      if (!system || !Array.isArray(system)) {
        return
      }

      for (let index = 0; index < system.length; index += 1) {
        if (typeof system[index] === "string") {
          system[index] = system[index].replace(opencodePattern, "ClaudeCode")
        }
      }
    },
  }
}