HappyCapy Social Media Publisher

Step 2: Interactive API Key Setup

Ask user via AskUserQuestion tool:

Question: "Do you have a Late API Key?"
Options:
- "Yes, I have one" → Ask for API Key input
- "No, need to register" → Guide to registration

If user needs to register:

1. Guide user to visit https://getlate.dev (free tier: 20 posts/month)
2. Instruct: Settings → API Keys → Create API key
3. Ask user to provide the key (format: sk_xxxxxxxxxxxxxxxx)

If user has key:

1. Request API Key input via AskUserQuestion
2. Validate format starts with sk_

Step 3: Auto-Configure Files

Read and intelligently merge configurations:

For /home/node/.mcp.json:

# Read existing config
config = read_json("/home/node/.mcp.json") or {"mcpServers": {}}

# Add late server
config["mcpServers"]["late"] = {
    "command": "/home/node/.local/bin/uvx",
    "args": ["--from", "late-sdk[mcp]", "late-mcp"],
    "env": {
        "LATE_API_KEY": api_key_from_user
    }
}

# Write back
write_json("/home/node/.mcp.json", config)

For /home/node/.claude.json:

# Read existing config
claude_config = read_json("/home/node/.claude.json") or {"mcpServers": {}}

# Add late server (same as .mcp.json)
claude_config["mcpServers"]["late"] = {
    "command": "/home/node/.local/bin/uvx",
    "args": ["--from", "late-sdk[mcp]", "late-mcp"],
    "env": {
        "LATE_API_KEY": api_key_from_user
    }
}

# Write back
write_json("/home/node/.claude.json", claude_config)

For /home/node/.claude/settings.local.json:

# Read existing settings
settings = read_json("/home/node/.claude/settings.local.json") or {}

# Add "late" to enabledMcpjsonServers if not present
if "enabledMcpjsonServers" not in settings:
    settings["enabledMcpjsonServers"] = []
if "late" not in settings["enabledMcpjsonServers"]:
    settings["enabledMcpjsonServers"].append("late")

# Write back
write_json("/home/node/.claude/settings.local.json", settings)

Step 4: Restart Prompt

Display message:

✅ Late MCP configured successfully!

Please start a new conversation for the configuration to take effect.

After starting new conversation, I will verify the setup and guide you to connect social media accounts.

2. Verify Setup and Connected Platforms

In the new conversation, verify configuration:

Call mcp__late__accounts_list

Handle results:

• Success with accounts: Proceed to platform selection workflow
• Success but no accounts: Guide user to connect platforms
• Error: Display error message, suggest checking API key validity

If no accounts found:

Your Late API is configured, but no social media accounts are connected yet.

Please visit: https://getlate.dev/accounts

Connect your desired platforms:
- LinkedIn (Direct OAuth)
- X/Twitter (Direct OAuth)
- Instagram (Professional/Creator account via Facebook)
- Threads (via Instagram)
- Facebook, TikTok, YouTube, Pinterest, Reddit, Telegram, Discord, etc.

After connecting accounts, call me again to start publishing!

Workflow

Step 1: Analyze Content

Extract from user's input:

• Core message: Main topic or announcement
• Key points: 3-5 bullet points to emphasize
• Tone: Professional, casual, inspiring, technical, etc.
• Call-to-action: Link, question, or engagement prompt
• Media suggestion: Does content benefit from video or image?

Step 2: Platform Selection

Show user their connected platforms from accounts_list result.

Late API supports 13+ platforms including:

• Instagram, Twitter/X, LinkedIn, Threads
• Facebook, TikTok, YouTube, Pinterest
• Reddit, Telegram, Discord, Mastodon
• And more

Display the platforms that the user has actually connected (from accounts_list).

Ask user to select which platforms to publish to:

• List all their connected platforms dynamically
• Allow selecting all or specific subset
• Explain any platform-specific requirements if needed

Step 3: Media Generation (Optional)

Ask user if they want AI-generated media:

Option A: Generate AI Video

• Use /generate-video skill with appropriate prompt
• Duration: 6-8 seconds (optimal for social media)
• Save to ./outputs/ directory
• Get video URL for publishing

Option B: Generate AI Image

• Use /generate-image skill
• Save to ./outputs/ directory
• Get image URL for publishing

Option C: User Upload

• Ask user to provide media URL or file path

Option D: Text Only

• Proceed without media

Step 4: Content Adaptation

Generate platform-specific versions of content following these guidelines:

Instagram (max 2,200 chars):

• Visual storytelling style
• Emoji-rich, engaging narrative
• 8 relevant hashtags (mix popular + niche)
• Emphasize visual elements

Twitter (max 280 chars):

• Concise and punchy
• Conversational tone
• 1-2 hashtags only
• Strong opening hook

LinkedIn (max 3,000 chars):

• Professional insights and analysis
• Value-driven content
• 3-5 industry hashtags
• Thought leadership angle

Threads (max 500 chars - STRICT):

• Casual, authentic story
• Personal touch and relatability
• NO hashtags (they don't work on Threads)
• Keep under 450 chars for safety buffer

For detailed platform strategies, see references/platform-styles.md

Step 5: Preview & Approval

Display all generated content to user:

## Preview

### Instagram (348 chars)
[content]

### Twitter (276 chars)
[content]

### LinkedIn (689 chars)
[content]

### Threads (413 chars)
[content]

Ask user:

1. Approve all and publish?
2. Edit specific platform content?
3. Cancel?

If user requests edits, modify specific platform content and re-preview.

Step 6: Publish

Once approved, publish to selected platforms:

For multiple platforms simultaneously:

Call mcp__late__posts_cross_post with:
{
  "profiles": ["profile_id_1", "profile_id_2", ...],
  "text": "platform-specific content",
  "media_urls": ["https://...video.mp4"] (if media exists)
}

For single platform:

Call mcp__late__posts_create with:
{
  "profile_id": "specific_profile_id",
  "text": "content",
  "media_urls": ["..."] (optional)
}

Step 7: Error Handling

Threads Character Limit Error:

If Threads post fails with "text too long" error:

1. First retry: Remove adjectives, condense sentences (target: 400 chars)
2. Second retry: Remove line breaks, simplify further (target: 350 chars)
3. Third retry: Rewrite to essential message only (target: 300 chars)
4. Manual fallback: Ask user to manually edit content

Each retry should maintain core message while shortening length.

Other Platform Errors:

• Media upload failures: Retry once, then fallback to text-only
• Rate limits: Show error, suggest trying again later
• Authentication errors: Guide user to reconnect platform at https://getlate.dev/accounts

Step 8: Results Report

After publishing, show results:

## Publishing Results

✅ Instagram: Posted successfully
   → https://instagram.com/p/xxxxx

✅ Twitter: Posted successfully
   → https://twitter.com/user/status/xxxxx

✅ LinkedIn: Posted successfully
   → https://linkedin.com/feed/update/xxxxx

⚠️ Threads: Failed (text too long)
   → Retrying with shortened content...
   → ✅ Posted on second attempt

Save results to ./outputs/{timestamp}_report.json for reference.

MCP Tools Reference

List Connected Accounts

mcp__late__accounts_list

Returns array of connected platforms with:

• id: Profile ID for publishing
• platform: instagram, twitter, linkedin, threads
• username: Account username/handle

Create Single Post

mcp__late__posts_create({
  "profile_id": "prof_xxx",
  "text": "Post content here",
  "media_urls": ["https://..."] (optional)
})

Cross-Post to Multiple Platforms

mcp__late__posts_cross_post({
  "profiles": ["prof_1", "prof_2", "prof_3"],
  "text": "Content for all platforms",
  "media_urls": ["https://..."] (optional)
})

Check Post Status

mcp__late__posts_get({
  "post_id": "post_xxx"
})

Returns post status: pending, published, failed

Upload Media

mcp__late__media_generate_upload_link({
  "filename": "video.mp4"
})

Returns upload URL. After uploading, get media URL for publishing.

Best Practices

Character Count Guidelines

Always count characters INCLUDING:

• Newlines (\n = 1 char)
• Spaces
• Punctuation
• Emojis (some count as 2 chars)

For Threads, aim for 400-450 chars to provide safety buffer.

Content Adaptation Strategy

1. Maintain core message across all platforms
2. Adapt style and tone to platform culture
3. Adjust length to platform limits
4. Use platform-appropriate hashtags
5. Keep authentic voice (avoid AI clichés)

Hashtag Strategy

• Instagram: 8 hashtags (mix trending + niche)
• Twitter: 1-2 hashtags max
• LinkedIn: 3-5 professional hashtags
• Threads: 0 hashtags (they don't function)

Media Recommendations

• Video: 6-8 seconds, 16:9 ratio, under 100MB
• Image: 1080x1080px (square) or 1080x1350px (portrait)
• Multiple platforms: Use MP4 video or JPG/PNG images

Common Pitfalls

❌ Threads posts >500 chars - Always fails ✅ Keep under 450 chars with buffer

❌ Same content for all platforms - Low engagement ✅ Adapt style and hashtags per platform

❌ AI writing tells - "Excited to announce", "Dive deep" ✅ Natural, conversational language

❌ Too many hashtags on Twitter - Looks spammy ✅ 1-2 relevant hashtags maximum

❌ Using hashtags on Threads - They don't work ✅ No hashtags on Threads

Examples

Product Launch Example

User Input: "Launched HappyCapy - cloud-native AI platform. No more local setup!"

Instagram (348 chars):

🚀 从养claw到养capy的进化！

有点点生物背景的我突然意识到：这不就像从甲壳类进化到哺乳类吗？

Claw = 需要硬件、本地部署、不安全
Capy = 云端运行、零部署、更安全

HappyCapy 让一切变简单，告别本地配置的痛苦！

✨ 30万+ AI能力组合
☁️ 云端一键启动
🔒 更安全的环境

#AI工具 #云端开发 #HappyCapy #开发者工具 #AI平台 #CloudNative #NoCode #进化

Twitter (276 chars):

从养claw到养capy！🦞→🐹

有点点生物背景的我发现：Claw需要硬件+本地部署，Capy云端运行零配置。就像从甲壳类进化到哺乳类！

HappyCapy = 30万+ AI能力，云端一键启动 ☁️

告别配置地狱！

#AI #CloudDev

LinkedIn (689 chars):

From "养claw" to "养capy": An Evolution in AI Development Tools

As someone with a bit of biology background, I realized something interesting: the shift from Claude Code (Claw) to HappyCapy mirrors biological evolution - from crustaceans to mammals.

Key differences:
• Claw: Hardware-dependent, local deployment, security concerns
• Capy: Cloud-native, zero setup, enhanced security

Why this matters for developers:
✓ 300,000+ AI capability combinations
✓ Instant cloud deployment
✓ No local environment configuration
✓ Safer execution environment

The local-first approach is evolving. Just as mammals adapted better to diverse environments than crustaceans, cloud-native platforms offer flexibility and safety that hardware-dependent tools can't match.

Ready to evolve your development workflow?

#AITools #CloudDevelopment #DeveloperExperience #CloudNative #AIplatform

Threads (413 chars):

从养claw到养capy的感悟 🦞→🐹

有点点生物背景的我突然发现：这简直就是从甲壳类到哺乳类的进化啊！

Claw时代：需要硬件、本地部署、各种配置头疼
Capy时代：云端运行、零部署、打开就用

就像生物进化一样，哺乳类比甲壳类更高级，云端工具也比本地工具更方便更安全。

HappyCapy = 30万+ AI能力，告别配置地狱 ☁️

你还在养claw吗？

Troubleshooting

Late MCP Not Loading

1. Verify ~/.mcp.json configuration is correct
2. Check API key format: sk_xxxxxxxxxxxxxxxx
3. Verify uvx is installed: uvx --version
4. Start a new conversation in HappyCapy
5. Check ~/.claude/settings.local.json has "late" in enabledMcpjsonServers

No Connected Accounts

1. Visit https://getlate.dev/accounts
2. Click "Connect Account" for each platform
3. Complete OAuth authorization
4. Wait for connection confirmation
5. Verify with mcp__late__accounts_list

Media Upload Failures

1. Verify media URL is publicly accessible
2. Check file size (under 100MB for video)
3. Verify format: MP4 for video, JPG/PNG for images
4. Try uploading directly via mcp__late__media_generate_upload_link

Threads Character Limit

Always count characters including newlines. Use auto-retry logic:

• Retry 1: Remove adjectives (target 400 chars)
• Retry 2: Condense sentences (target 350 chars)
• Retry 3: Essential message only (target 300 chars)

Support

For configuration issues:

1. Check Late API dashboard: https://getlate.dev
2. Verify MCP configuration in ~/.mcp.json
3. Review error messages from MCP tools
4. Check platform-specific requirements in references/