x-composer（x 作曲家）

X Composer

Post to X.com via browser automation. No API key required.

Mode Priority

1. Playwright MCP (recommended) — Headless, most reliable, supports image upload
2. CDP mode — Auto-scans ports 9222-9230 for Chrome CDP
3. Clipboard fallback — Copies to clipboard and pastes via AppleScript

Playwright MCP Mode (Recommended)

Use Playwright MCP tools directly. Handles text, images, and posting without visible browser.

Post with text only

1. browser_navigate → https://x.com/compose/post
2. browser_snapshot → find textbox ref
3. browser_run_code → force click textbox, keyboard.type(content, {delay: 10})
4. browser_take_screenshot → verify draft
5. Ask user confirmation
6. browser_run_code → page.locator('[data-testid="tweetButton"]').dispatchEvent('click')

Post with image

1. Type content (same as above)
2. browser_run_code → page.locator('input[type="file"][accept*="image"]').first().setInputFiles('/path/to/image.png')
3. browser_take_screenshot → verify image attached
4. Post after confirmation

Key notes

• X.com has an overlay that blocks normal clicks — always use {force: true} or dispatchEvent('click')
• To clear text: Cmd+A then Backspace via page.keyboard
• Login persists in Playwright session — if not logged in, user must log in once manually
• fill() can cause duplicate text — prefer keyboard.type() with delay

CDP Mode (Fallback)

Quick Post

bash scripts/x-post.sh "Your post content here"

CDP Auto Port Detection

• Scans ports 9222-9230 for existing Chrome CDP (verifies it's Chrome, not Electron apps)
• Finds first available port to launch new Chrome instance
• Saves active port to ~/.chrome-cdp-port

Individual Scripts

# Open compose page
NODE_PATH=$(npm root -g) node scripts/cdp-launch.js [URL]

# Type text
echo '[{"text":"Hello"},{"enter":true},{"text":"World"}]' | NODE_PATH=$(npm root -g) node scripts/cdp-type.js

Clipboard Fallback

If CDP is unavailable (Chrome already running without debugging):

1. Copies text to clipboard via pbcopy
2. Focuses Chrome via AppleScript
3. Pastes via Cmd+V

Prerequisites

• Playwright MCP: playwright MCP server configured
• CDP mode: npm install -g chrome-remote-interface

Rules

• NEVER auto-post — always show draft and ask user for confirmation
• If X.com requires login, inform user to log in manually
• Take screenshot to verify content before posting
• For image posts, verify image is attached before posting

Troubleshooting