Night Market Skill — ported from claude-night-market/leyline. For the full experience with agents, hooks, and commands, install the Claude Code plugin.

Table of Contents

• Overview
• When to Use
• Authentication Methods
• Quick Start
• Verify Authentication
• Smoke Test
• Standard Flow
• Step 1: Check Environment
• Step 2: Verify with Service
• Step 3: Handle Failures
• Integration Pattern
• Detailed Resources
• Exit Criteria

Authentication Patterns

Overview

Common authentication patterns for integrating with external services. Provides consistent approaches to credential management, verification, and error handling.

When To Use

• Integrating with external APIs
• Need credential verification
• Managing multiple auth methods
• Handling auth failures gracefully

When NOT To Use

• Project doesn't use the leyline infrastructure patterns
• Simple scripts without service architecture needs

Authentication Methods

Quick Start

Verify Authentication

from leyline.auth import verify_auth, AuthMethod

# API Key verification
status = verify_auth(
    service="gemini",
    method=AuthMethod.API_KEY,
    env_var="GEMINI_API_KEY"
)

if not status.authenticated:
    print(f"Auth failed: {status.message}")
    print(f"Action: {status.suggested_action}")

Verification: Run the command with --help flag to verify availability.

Smoke Test

def verify_with_smoke_test(service: str) -> bool:
    """Verify auth with simple request."""
    result = execute_simple_request(service, "ping")
    return result.success

Verification: Run pytest -v to verify tests pass.

Standard Flow

Step 1: Check Environment

def check_credentials(service: str, env_var: str) -> bool:
    value = os.getenv(env_var)
    if not value:
        print(f"Missing {env_var}")
        return False
    return True

Verification: Run the command with --help flag to verify availability.

Step 2: Verify with Service

def verify_with_service(service: str) -> AuthStatus:
    result = subprocess.run(
        [service, "auth", "status"],
        capture_output=True
    )
    return AuthStatus(
        authenticated=(result.returncode == 0),
        message=result.stdout.decode()
    )

Verification: Run the command with --help flag to verify availability.