A2A / Agent2Agent Protocol vs ToolHive
An independent, evidence-based trust comparison of A2A / Agent2Agent Protocol and ToolHive, two Protocols & Tool Integration projects in the HVTracker registry. Scores come from public, checkable signals — supply-chain provenance, OSSF Scorecard, maintenance, and adoption — not popularity.
A2A / Agent2Agent Protocol leads on trust — 89.7/100 (Grade A) vs 71.0/100 (Grade B), a 18.7-point gap. Full breakdown below.
| Signal | A2A / Agent2Agent Protocolgoogle/A2A | ToolHivestacklok/toolhive |
|---|---|---|
| HVTrust score | 89.7 | 71.0 |
| Evidence grade | A | B |
| Coverage grade | A | C |
| Overall rank | #13 | #185 |
| Rank in Protocols & Tool Integration | #1 | #8 |
| GitHub stars | 25.6k | 2.1k |
| Last updated | 2d ago | today |
| Build provenance | Yes | No |
| OSSF Scorecard | 7.0 / 10 | 8.1 / 10 |
| License | Apache-2.0 | Apache-2.0 |
| Downloads | 2.6M/wk | — |
| Trust dimensions (points earned) | ||
| Safety / integrity / 25 | 21.2 | 15.1 |
| Identity & provenance / 18 | 18.0 | 10.8 |
| Transparency / 17 | 14.4 | 15.4 |
| Maintenance / 20 | 17.6 | 20.0 |
| Adoption / 20 | 19.1 | 8.0 |
| Runtime capability surface (full matrix) | ||
| MCP server | — | Implemented |
| External providers | — | — |
| Requires API keys | No | No |
| Plugin surface | extensions | plugins |
| Provenance drift | Unknown | — |
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A2A / Agent2Agent Protocol profile
ToolHive profile
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How to read this: HVTrust (0–100) weighs supply-chain signals (provenance, OSSF Scorecard, signed commits, open license) alongside real-world adoption, scaled by an evidence-confidence factor. Grade bands: A ≥ 80, B ≥ 65, C ≥ 50, D < 50. Signals refresh daily. Full methodology v4.3 →