Add Social Media Manager plugin

[spinnakergit]

Summary

Adds the Social Media Manager plugin to the marketplace index — a meta-plugin orchestrator for cross-platform social media posting.

• Repo: https://github.com/spinnakergit/a0-social-manager
• Tools: 5 (post, status, adapt, schedule, analytics)
• Skills: 3 (publish, campaign, monitor)
• Architecture: Meta-orchestrator — no external APIs of its own. Discovers installed platform plugins at runtime and delegates to their native posting tools.

Supported Platforms

Works with any installed Agent Zero social plugin: Bluesky, X, Reddit, Facebook, Threads, Instagram, LinkedIn, YouTube, Pinterest, TikTok. Automatically detects which are installed and configured.

Features

• Cross-posting — Single command posts to all (or a selected subset of) connected platforms
• Content adaptation — Auto-trims and reformats content per platform character limits (280 for X, 300 for Bluesky, 500 for Threads, etc.)
• Hashtag normalization — Configurable max hashtags, platform-aware formatting
• Local scheduling — Store posting intent for future execution with timezone support
• Analytics aggregation — Collects metrics from all connected platforms into a unified view
• Dedup guards — Prevents duplicate side-effect operations on A0 tool retries

Thumbnail

Includes a custom thumbnail.png (256x256, 5.3 KB) with the Agent Zero logo as the orchestration hub and brand marks for the primary platforms.

Testing

• Regression test suite (structural)
• Automated HV suite
• Manual HV plan documented in tests/HUMAN_TEST_PLAN.md