okta-auth: Instructions file for Claude Code

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

okta-auth is an Okta login toolkit with an interactive CLI and an MCP server for session reuse. It uses Playwright to automate Okta SSO and persists per-domain session state for reuse by AI agents.

Commands

# Setup
uv venv && source .venv/bin/activate
uv pip install -e '.[dev]'
playwright install chromium

# Quality gates (run all three before submitting)
ruff format --check .
ruff check .
pytest

# Run single test
pytest tests/test_session_store.py -v

# Run interactive CLI
okta

# Run MCP server (stdio transport, stdout is JSON-RPC)
okta-auth

Architecture

src/okta_auth/
├── server.py          # FastMCP entry point, defines all 5 MCP tools
├── log.py             # Stderr-only logging (stdout reserved for JSON-RPC)
├── auth/
│   ├── login.py       # auto_login() engine: selector-based form filling, portal detection, MFA/TOTP
│   ├── session_store.py  # Per-domain session CRUD at ~/.okta-auth/sessions/
│   └── totp.py        # pyotp wrapper for TOTP code generation
└── browser/
    ├── controller.py  # BrowserController async context manager, BrowserConfig dataclass
    ├── detection.py   # Cross-platform browser executable discovery with env var overrides
    └── helpers.py     # fill_first_match(), click_first_match(), maybe_switch_to_code_factor()

Key Patterns

• Selector redundancy: login.py defines 16+ CSS selectors per form field (USERNAME_SELECTORS, PASSWORD_SELECTORS, etc.) tried in priority order for broad Okta form compatibility.
• Portal detection: _is_on_portal() confirms auth completion by checking domain change + login field absence.
• Session keying: Sessions are stored as {domain_hash}.json + {domain_hash}.meta.json using the URL's netloc as the domain key.
• Async-first: All I/O uses async/await; the server runs on asyncio via FastMCP.
• Browser fallback: BrowserController tries the requested channel first, falls back to default Chromium on launch failure.