Decision Workspace
mcp-calendar vs mcp-email vs adk-tool
Side-by-side comparison of Rust crates
45
mcp-calendar
experimentalv1.1.0
Calendar MCP Server — Google Calendar and Microsoft Graph for event management
49
mcp-email
experimentalv1.6.0
Email MCP Server — multi-backend sending (SMTP, AWS SES, SendGrid, Gmail, Microsoft Graph) with inbox reading and management
63
adk-tool
experimentalv0.9.1
Tool system for Rust Agent Development Kit (ADK-Rust) agents (FunctionTool, MCP, Google Search)
Core Metrics
| mcp-calendar | mcp-email | adk-tool | |
|---|---|---|---|
| Health Score | 45 | 49 | 63 |
| Total Downloads | 26 | 102 | 5.8K |
| 30d Downloads | 0 | 0 | 2.0K |
| Dependents | 0 | 0 | 76 |
| Releases | 2 | 7 | 26 |
| Last Updated | 1d ago | 1d ago | 2d ago |
| Age | 1d | 1d | 5m |
Health Breakdown
mcp-calendar
Maintenance
14
Quality
14
Community
5
Popularity
2
Documentation
10
mcp-email
Maintenance
19
Quality
13
Community
5
Popularity
2
Documentation
10
adk-tool
Maintenance
20
Quality
13
Community
11
Popularity
4
Documentation
15
Technical Details
| mcp-calendar | mcp-email | adk-tool | |
|---|---|---|---|
| Version | 1.1.0 | 1.6.0 | 0.9.1 |
| Stable (≥1.0) | ✓ Yes | ✓ Yes | ✗ No |
| License | Apache-2.0 | Apache-2.0 | Apache-2.0 |
| Dependencies | 15 | 23 | 26 |
| Crate Size | 27KB | 43KB | 127KB |
| Features | 0 | 0 | 11 |
| Yanked % | 0.0% | 0.0% | 0.0% |
| Edition | 2024 | 2024 | 2024 |
| MSRV | — | — | 1.85.0 |
| Owners | 1 | 1 | 1 |
Links
Quick Verdict
- •adk-tool leads with a health score of 63/100, but none of the options score above 80.
- •adk-tool is pre-1.0 — API may change.