In-depth architectural comparison of the Yesterdays Number and Mercury Number MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.
At a Glance & Executive Verdict
Yesterdays Number
Social Media · Local stdio
Quality: 25/100 (Emerging) | Auth: No auth required
Mercury Number
Social Media · Local stdio
Quality: 25/100 (Emerging) | Auth: No auth required
Verdict Summary: Choose Yesterdays Number if you need specialized Social Media tools running via a local process. Choose Mercury Number if your workspace requires Social Media integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.
Which MCP Server Should You Choose?
Y
Choose Yesterdays Number when:
You need dedicated capabilities in the Social Media domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
Yesterdays Number is categorized under Social Media and uses a local stdio subprocess. In contrast, Mercury Number belongs to Social Media using local stdio subprocess. Select Yesterdays Number when you need capabilities focused on social media and Mercury Number when you require tools for social media.