Shield
https://shield.vainplex.dev/mcp ↗
Description
Protect digital identities and infrastructure by scanning for data breaches, malicious URLs, and compromised credentials. Secure interactions by detecting prompt injection attacks and evaluating plugin supply chain risks. Monitor the reputation of domains, IPs, and email addresses to defend against phishing and malware.
What our measurements say
Shield is a remote MCP server published at shield.vainplex.dev. It has been probed 6 times since 9/10/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 419 ms, placing it among the faster endpoints. It offers a narrow, focused set of 9 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Most tool names clearly indicate their purpose (e.g., check_url, check_password).
- Comprehensive coverage of security checks across digital identity and infrastructure risks.
Weaknesses
- Some tool descriptions are truncated (e.g., shieldapi.check_prompt).
- Lack of explicit error handling or constraint documentation in descriptions.
- Ambiguity in 'scan_skill' tool's purpose (unclear what 'skill' refers to).
shieldapi.scan_skill— Vague terminology ('skill') without context for agent interpretationshieldapi.check_prompt— Truncated description cuts off critical implementation detailsshieldapi.full_scan— Potential redundancy with individual check tools
Verdict
Event narrative
Risk: medium
- 2026-09-10T21:16:35.016Z — era changed from 'auth-gated' to 'legacy' · may indicate security policy shift affecting access controls
- 2026-09-11T09:28:19.138Z — complianceScore improved from null to 100 · suggests system now meets regulatory requirements
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 338ms → warm 299ms (penalty 39ms)
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Server build: — → 2.4.0
- Supported versions: — → 2025-11-25
- Era changed: Auth-gated → Legacy
- Added to watch — era: Auth-gated
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