A2A / Agent2Agent Protocol vs Composio
An independent, evidence-based trust comparison of A2A / Agent2Agent Protocol and Composio, 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 — 88.7/100 (Grade A) vs 75.9/100 (Grade B), a 12.8-point gap. Full breakdown below.
| Signal | A2A / Agent2Agent Protocolgoogle/A2A | Composiocomposiohq/composio |
|---|---|---|
| HVTrust score | 88.7 | 75.9 |
| Evidence grade | A | B |
| Coverage grade | A | A |
| Overall rank | #12 | #72 |
| Rank in Protocols & Tool Integration | #1 | #5 |
| GitHub stars | 25.0k | 29.4k |
| Last updated | 3d ago | 1d ago |
| Build provenance | Yes | No |
| OSSF Scorecard | 7.0 / 10 | 7.1 / 10 |
| License | Apache-2.0 | MIT |
| Downloads | 2.6M/wk | 103k/wk |
| Trust dimensions (points earned) | ||
| Safety / integrity / 25 | 21.2 | 13.2 |
| Identity & provenance / 18 | 18.0 | 10.8 |
| Transparency / 17 | 14.4 | 14.5 |
| Maintenance / 20 | 16.6 | 19.9 |
| Adoption / 20 | 19.1 | 17.4 |
| Runtime capability surface (full matrix) | ||
| MCP server | — | Declared |
| External providers | — | 3 — Anthropic, Google Gemini, OpenAI |
| Requires API keys | No | No |
| Plugin surface | plugins | plugins |
| Provenance drift | Unknown | Partial |
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A2A / Agent2Agent Protocol profile
Composio 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 v4.2 →