Claude Code System Prompts - The magic prefix for OAuth (from cli.js v2.0.69)

claude-code-system-prompts.js

/**
 * Claude Code System Prompts
 * Extracted from @anthropic-ai/claude-code v2.0.69
 * Source: https://unpkg.com/@anthropic-ai/claude-code/cli.js (line 188088)
 *
 * These prompts are validated server-side by Anthropic.
 * OAuth tokens will be rejected without the correct system prompt prefix.
 */

// =============================================================================
// Original Source (cli.js lines 188085-188092, prettified)
// =============================================================================

/*
function gaQ() {
  return "";
}
var haQ = "You are Claude Code, Anthropic's official CLI for Claude.",
  f03 =
    "You are Claude Code, Anthropic's official CLI for Claude, running within the Claude Agent SDK.",
  b03 = "You are a Claude agent, built on Anthropic's Claude Agent SDK.";
var vy1 = L(() => {
  hX();
  J4();
});
*/

// =============================================================================
// Readable Version - System Prompts
// =============================================================================

/**
 * Standard Claude Code CLI prompt
 * Used for direct CLI interactions
 */
const CLAUDE_CODE_PROMPT = "You are Claude Code, Anthropic's official CLI for Claude.";

/**
 * Claude Code running within Agent SDK
 * Used when Claude Code is invoked via @anthropic-ai/claude-agent-sdk
 */
const CLAUDE_CODE_AGENT_SDK_PROMPT = "You are Claude Code, Anthropic's official CLI for Claude, running within the Claude Agent SDK.";

/**
 * Generic Claude Agent prompt
 * Used for custom agents built on the Agent SDK
 */
const CLAUDE_AGENT_PROMPT = "You are a Claude agent, built on Anthropic's Claude Agent SDK.";

// =============================================================================
// Summary
// =============================================================================

/*
| Variable | Prompt                                                                        | Use Case          |
|----------|-------------------------------------------------------------------------------|-------------------|
| haQ      | "You are Claude Code, Anthropic's official CLI for Claude."                   | Standard CLI      |
| f03      | "You are Claude Code, Anthropic's official CLI for Claude, running within..." | Agent SDK mode    |
| b03      | "You are a Claude agent, built on Anthropic's Claude Agent SDK."              | Generic agent     |

The first prompt (haQ) is the "magic" prefix required for OAuth tokens to work with the API.
Without this exact prefix, the API returns:
{
  "type": "error",
  "error": {
    "type": "invalid_request_error",
    "message": "This credential is only authorized for use with Claude Code and cannot be used for other API requests."
  }
}
*/

export { CLAUDE_CODE_PROMPT, CLAUDE_CODE_AGENT_SDK_PROMPT, CLAUDE_AGENT_PROMPT };