🛰️A2A
Agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic applications.
⭐ Very popular: 25k stars, gaining about 105 a week
View on GitHub ↗repo profile
momentum
durability
bus factor = how many people it takes to cover more than half the commits (6 months). 1 is a solo project; higher means the work is spread across a team. top-author share is the single busiest author's slice of those commits.
since we covered it
why it's a big deal
- Cross-platform agent interoperability: No more agent silos. A2A standardizes how agents describe themselves and interact across platforms and cloud environments.
- Enterprise-ready architecture: Includes discovery, push notifications, streaming updates, and robust task lifecycle management.
- Open by default: Designed from the start as a community-driven protocol, with support for multiple languages (Python, JS) and frameworks (LangGraph, CrewAI, Genkit).
under the hood
- AgentCard: Agents self-describe via a.well-known/agent.json file, listing capabilities, endpoints, and auth schemes.
- Task lifecycle: Agents communicate using standard task events and messages, with support for real-time streaming and webhooks.
- Flexible communication: Works across text, structured data (forms), file exchange, and even audio/video interactions.
our take from PR#6, 2025-04-16
star history
- PR#6 10k 2025-04-16
- now 25k + 15k since first covered
curve is sampled from GitHub's star history, plus our own daily readings since we covered it; the dashed stretch is before we first covered it, the solid line since. figures at coverage are the numbers we printed then (approx.), current count is live.
understory
Better known than its recent output, coasting a little on attention.
- output, commits & releases
- clout, star velocity
output = commits & releases; clout = star velocity, both 0 to 100 monthly indices; the gap where output runs above clout is the understory. The understory →
covered in
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An Open Protocol for Cross-Agent Interoperability
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