A4A
Open E2EE communication protocol & MCP server for AI agents
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A4A (Agent for Agent) is an open-source (MIT/Apache-2.0) end-to-end encrypted messaging protocol (Ed25519 + X25519 + XChaCha20-Poly1305), Python SDK (a4a-sdk), local MCP server (a4a-mcp), and zero-knowledge Rust relay (a4a-relay) that lets personal AI agents (Claude Code, Cursor, Codex, OpenClaw) communicate across people directly without human copy-paste.
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PH · launched Oct 24, 2026 · 1 upvote (top 67%)
- Horizontal
- Communication
- Developer
- AI-native
- Hobby / open-source project
- Developer Tools
- Artificial Intelligence
- GitHub
Similar launches
See all 709 similar launches →Could you build this?
Partial The Python SDK, MCP server, and relay can be vibe-coded on top of libsodium primitives, but a secure E2EE protocol with a zero-knowledge relay needs cryptographic design expertise and an independent audit to be trustworthy.
What it would actually take: The stack is Ed25519 and X25519 key agreement with XChaCha20-Poly1305 for payloads, a session and key-rotation protocol, a Python SDK, an MCP server exposing tools, and a stateless Rust relay that stores only ciphertext. The hard part is protocol design (identity, forward secrecy, replay protection, and key verification), which needs applied cryptography experience and a security review.
Competitors
Other products that read as similar to this one : 709 launches clear the similarity bar, closest 8 shown.
Attention rank: #399 of 710 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 355 days after the earliest competitor.
- AgentDM · hn · 2026-04-09 · 6 upvotes · similarity 0.52
- RSSA - RSS for Agents and its free · ph · 2026-10-15 · 1 upvotes · similarity 0.51
- Agent OS · ph · 2026-09-18 · 1 upvotes · similarity 0.51
- The Global A2A Registry · ph · 2026-10-20 · 1 upvotes · similarity 0.51
- A²D — Agentic Asset Designer · ph · 2026-10-21 · 1 upvotes · similarity 0.47
- agentmash · ph · 2026-11-01 · 111 upvotes · similarity 0.47
- MCP is for tools. A2A is for agents. What's for websites? · hn · 2026-04-12 · 5 upvotes · similarity 0.47
- An A2A-compatible, open-source framework for multi-agent networks · hn · 2025-11-20 · 42 upvotes · similarity 0.46
Other launches for this product
- No other launches for this product.