Fastmcp
PrefectHQ/fastmcpApache-2.0⭐ 23,638🔧 97 tools
D6.2SpiderScore (registry)
🚀 The fast, Pythonic way to build MCP servers and clients.
Decision
Consider
Confidence
90%
Fastmcp is usable with minor concerns (6.17/10, 0 critical, 0 high).
Risk Flags (2)
- mediumssrf×2Potential SSRF -- unrestricted network requests with user-controlled URLs
- lowno_input_validation×8MCP tool handler accepts raw string input without validation
How This Was Decided
- positivew=0.5Overall quality score = 6.17/10 (grade D)
- negativew=0.3Tool description clarity score = 1.8/10
Source: SpiderRating automated security scanUpdated: 2026-03-13Protocol: v1.1
Description Quality
Composite: 1.8 / 10
3-Layer Breakdown
Description (38%)
1.8
Security (34%)
8.2
Metadata (28%)
9.7
Description Dimensions
Intent Clarity
1.6
Permission Scope
0.0
Side Effects
2.6
Capability Disclosure
3.3
Operational Boundaries
1.8
Security Analysis
8.2
Score
0
Critical
0
High
2
Medium
8
Low
Findings Redacted
Detailed security findings are hidden during the 90-day responsible disclosure window. Maintainers have been notified.
8 LOW2 MEDIUM
Metadata Health
Provenance (40%)
10.0
Maintenance (35%)
9.0
Popularity (25%)
10.0
Badge
Add this badge to your README:
[](https://spiderrating.com/servers/PrefectHQ/fastmcp)🛡️
Protect Your Agents
Get a free API key. Every MCP tool call checked against 15,923 rated servers in real-time.
Get Free API Key →📊
Monitor All Your Servers
Dashboard for your entire MCP portfolio. Score tracking, alerts, and compliance reports.
Start Free Trial →⭐
Scan Locally (Open Source)
Run SpiderShield on your own machine. 46+ security rules, zero data leaves your system.
Star on GitHub →