Registry › Compare › A2A / Agent2Agent Protocol vs FastMCP (TypeScript)

A2A / Agent2Agent Protocol vs FastMCP (TypeScript)

Both are Grade A and 2.6 points apart, so choose on what you weigh most. A2A / Agent2Agent Protocol leads on supply-chain integrity and adoption, and rests on broader evidence; FastMCP (TypeScript) leads on maintenance.

A A2A / Agent2Agent Protocol 89.4

Agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic applications.

a2aproject/A2A · #29 overall · #4 Protocols & Tool Integration · coverage A (4/5)

Choose A2A / Agent2Agent Protocol if supply-chain integrity and adoption matter most.

+4.1Safety / Integrity: 100% of recent commits signed, against 79%
+3.0Adoption: 2.7M weekly downloads against 707.1k
+2.1Transparency: OSSF Scorecard 7.0 against 4.5
A vs BEvidence coverage: 4 of 5 independent signal types, against 3

A FastMCP (TypeScript) 86.8

A TypeScript framework for building MCP servers.

punkpeye/fastmcp · #69 overall · #5 Protocols & Tool Integration · coverage B (3/5)

Choose FastMCP (TypeScript) if maintenance matters most.

+0.7Maintenance

Where they differ

21.2

Safety / IntegrityA2A / Agent2Agent Protocol +4.1

17.1

14.4

TransparencyA2A / Agent2Agent Protocol +2.1

12.3

17.2

MaintenanceFastMCP (TypeScript) +0.7

17.9

19.2

AdoptionA2A / Agent2Agent Protocol +3.0

16.2

-0.6

Runtime calibrationFastMCP (TypeScript) +5.9

+5.3

1 dimension identical: Identity 18.0 · Full evidence table

An independent, evidence-based trust comparison of A2A / Agent2Agent Protocol and FastMCP (TypeScript), 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.

Full evidence

Signal	A2A / Agent2Agent Protocola2aproject/A2A	FastMCP (TypeScript)punkpeye/fastmcp
HVTrust score	89.4	86.8
Evidence grade	A	A
Coverage grade	A	B
Overall rank	#29	#69
Rank in Protocols & Tool Integration	#4	#5
GitHub stars	26.1k	3.3k
Last updated	1d ago	10d ago
Build provenance	Yes	Yes
OSSF Scorecard	7.0 / 10	4.5 / 10
License	Apache-2.0	MIT
Downloads	2.7M/wk	707k/wk
Trust dimensions (points earned)
Safety / integrity / 25	21.2	17.1
Identity & provenance / 18	18.0	18.0
Transparency / 17	14.4	12.3
Maintenance / 20	17.2	17.9
Adoption / 20	19.2	16.2
Runtime capability surface (full matrix)
MCP server	—	Implemented
External providers	—	—
Requires API keys	No	No
Plugin surface	extensions	—
Provenance drift	Unknown	Match

Open in the live compare tool → A2A / Agent2Agent Protocol profile FastMCP (TypeScript) profile More Protocols & Tool Integration →

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 v4.4 →