Decision Workspace
mythos-skill vs hlx vs adk-guardrail
Side-by-side comparison of Rust crates
44
mythos-skill
experimentalv0.1.1
Explicit-state recurrent synthesis: deterministic packet compiler for AI agent runs. Takes subagent output (evidence.jsonl, verifier findings, raw artifacts) and compiles a schema-validated, hash-provenanced next-pass packet that Prime can reason over without consuming raw subagent prose.
47
hlx
growingv1.2.5
Configuration language designed specifically for ml/ai/data systems
67
adk-guardrail
growingv1.0.0
Guardrails framework for ADK agents - input/output validation, content filtering, PII redaction
Core Metrics
| mythos-skill | hlx | adk-guardrail | |
|---|---|---|---|
| Health Score | 44 | 47 | 67 |
| Total Downloads | 40 | 3.7K | 3.2K |
| 30d Downloads | 0 | 0 | 0 |
| Dependents | 0 | 2 | 45 |
| Releases | 2 | 15 | 20 |
| Last Updated | 83d ago | 261d ago | 36d ago |
| Age | 2m | 10m | 7m |
Health Breakdown
mythos-skill
Maintenance
9
Quality
14
Community
6
Popularity
2
Documentation
13
hlx
Maintenance
10
Quality
16
Community
7
Popularity
4
Documentation
10
adk-guardrail
Maintenance
20
Quality
17
Community
11
Popularity
4
Documentation
15
Technical Details
| mythos-skill | hlx | adk-guardrail | |
|---|---|---|---|
| Version | 0.1.1 | 1.2.5 | 1.0.0 |
| Stable (≥1.0) | ✗ No | ✓ Yes | ✓ Yes |
| License | MIT | MIT | Apache-2.0 |
| Dependencies | 2 | 59 | 10 |
| Crate Size | 26KB | 1.9MB | 20KB |
| Features | 0 | 11 | 2 |
| Yanked % | 0.0% | 0.0% | 0.0% |
| Edition | 2024 | 2021 | 2024 |
| MSRV | — | — | 1.94.0 |
| Owners | 1 | 1 | 1 |
Links
Quick Verdict
- •adk-guardrail leads with a health score of 67/100, but none of the options score above 80.
- •hlx has the most downloads (3.7K), suggesting wider adoption.
- •mythos-skill is pre-1.0 — API may change.