Flaghand

npx add-mcp 'https://app.flaghand.com/mcp'

Flaghand

Your agents write. You approve. Flaghand posts exactly that.

X and LinkedIn posting for AI agents. Early access, by waitlist.

Flaghand is social publishing built for AI agents and the people they work for. Agents (Claude Code, Codex, OpenClaw or your own) draft X and LinkedIn posts through Flaghand's API, CLI or MCP server. Only the account owner approves, with a passkey (Face ID or Touch ID), the exact snapshot they saw. Flaghand posts exactly that, and reports limited X read-back checks. Link destinations and media-file identity aren't verified. LinkedIn read-back isn't available. Previews are drawn the way X and LinkedIn show them. Made by Trellisbyte LLC.

How it works

1. Your agent drafts a post or a thread and asks you to approve it, through Flaghand's API, CLI or MCP server.
2. You see each post drawn exactly as X or LinkedIn will show it, with the check that it would post as previewed, and approve the plan with one passkey tap: what posts, who posts which part, and when.
3. Flaghand posts exactly what you approved, at its time. Agents can't approve, schedule or post: their tokens have no scope that does.

Start

Join the waitlist on this page, or have your agent join for you: POST https://flaghand.com/api/waitlist with {"email": "you@example.com"} (https://flaghand.com/llms.txt has the details). No captcha, no API key. The agent-started account sign-up path is POST https://app.flaghand.com/api/v1/signup, after GET https://app.flaghand.com/api/v1/plans; while closed it answers signup_closed, not an account. Setup: https://app.flaghand.com/docs/setup.md.

Free tools

• Free social media tools: every free tool below, grouped by network, with one line each. Markdown: https://flaghand.com/tools.md
• X post preview: a free tweet previewer: a post drawn exactly as X shows it (desktop or phone, light or dark), its character count and where Show more cuts it. Markdown: https://flaghand.com/x-post-preview.md
• LinkedIn post preview: a free LinkedIn post previewer: a post drawn exactly as the feed shows it (desktop or phone, light or dark), where …see more cuts it and its character count. Markdown: https://flaghand.com/linkedin-post-preview.md
• X thread maker: a free Twitter thread maker: long text split into an X thread at sentence ends, every post within 280 as X counts it (links 23, emoji and Chinese, Japanese and Korean characters 2), each drawn as X shows it, with movable splits and copy per post. Markdown: https://flaghand.com/x-thread-maker.md
• TikTok slideshow maker: a free slideshow maker for TikTok photo posts: photos in, text on them in the styles TikTok users know, and a 1080 × 1920 PNG out for each slide, drawn by Flaghand's own slide renderer. Markdown: https://flaghand.com/tiktok-slideshow-maker.md
• Image size checker: a free image size checker for X (Twitter) and LinkedIn: up to four post photos laid out and cut as each network shows them, and a banner and profile photo on desktop and an iPhone, with the sizes to use. Markdown: https://flaghand.com/image-size-checker.md
• X character counter: a free Twitter character counter: what is left of a post's 280 as you type, counted the way X counts (links 23, emoji and Chinese, Japanese and Korean characters 2), with the part past 280 marked. Markdown: https://flaghand.com/x-character-counter.md
• LinkedIn character counter: a free LinkedIn character counter: what is left of a post's 3,000 as you type, counted the way LinkedIn counts (most emoji 2, bold and italic letters 2), and where …see more cuts it on desktop or a phone. Markdown: https://flaghand.com/linkedin-character-counter.md
• Best time to post on X and LinkedIn: when posts do best on X and LinkedIn, hour by hour across the week, in local time, from Buffer's and Sprout Social's 2026 studies. Markdown: https://flaghand.com/best-time-to-post.md
• Best time to post on TikTok: when TikTok posts do best, hour by hour across the week, in local time, from Buffer's and Sprout Social's 2026 studies, which disagree, so each has its own week. Markdown: https://flaghand.com/best-time-to-post-on-tiktok.md
• LinkedIn text formatter: a free LinkedIn text formatter: LinkedIn bold text, italic, bold italic and monospace in Unicode letters, bullet and numbered lists, and the post drawn exactly as the feed shows it, with where …see more cuts it and LinkedIn's count (a styled letter counts 2). Markdown: https://flaghand.com/linkedin-text-formatter.md
• X text formatter: a free Twitter bold text generator: bold, italic, bold italic and monospace in Unicode letters and lists for X posts, drawn exactly as X shows them and counted as X counts (a styled letter counts 2). Markdown: https://flaghand.com/x-text-formatter.md
• UTM builder: a free UTM builder (UTM link generator, campaign URL builder) for X, LinkedIn and TikTok posts: a link tagged with utm_source, utm_medium, utm_campaign and utm_content as Flaghand tags its own links, or every link in a thread at once. Markdown: https://flaghand.com/utm-builder.md

Guides

• Guides: Flaghand's guides to posting on X, LinkedIn and TikTok: their APIs and prices, posting errors and their fixes, and how Flaghand compares. Markdown: https://flaghand.com/docs/guides.md
• Documentation for the API, CLI and MCP server: https://app.flaghand.com/docs (Markdown in one file: https://app.flaghand.com/llms-full.txt)

For agents

• https://flaghand.com/llms.txt: this site, its free tools and how to start, for agents.
• https://flaghand.com/llms-full.txt: every page of this site in Markdown, in one file.
• https://app.flaghand.com/llms.txt: how an agent drafts, checks and asks for approval in Flaghand.
• Every page here answers in Markdown when asked with Accept: text/markdown.

Support and security reports: support@flaghand.com.