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A2A / Agent2Agent Protocol vs Model Context Protocol / MCP

An independent, evidence-weighted trust comparison of two protocols & tool integration — ranked on verifiable signals, not popularity.

A2A / Agent2Agent Protocol ranks higher with an HVTrust score of 89.3 vs 65.0/100 (Grade A vs B). HVTrust reflects supply-chain safety, transparency, maintenance, and adoption — weighted by how much verifiable evidence exists.
SignalA2A / Agent2Agent ProtocolModel Context Protocol / MCP
HVTrust score89.365.0
Evidence gradeAB
Registry stateListedListed
Safety / Integrity (25)21.211.8
Identity / Provenance (18)18.010.8
Transparency (17)14.413.9
Maintenance (20)16.616.6
Adoption (20)19.111.9
GitHub stars24.1k86.7k
Weekly downloads2,628,077—
Last push2026-06-042026-06-04
LanguageShellTypeScript
OSSF Scorecard7.06.4
Review flags——
Recent change2026-05-29: HVTrust up 10.2pts (75.2 → 85.4)2026-06-01: Rank dropped 15 spots (#65 → #80)
Full A2A / Agent2Agent Protocol report → Full Model Context Protocol / MCP report → All Protocols & Tool Integration →