Reddit comparison of 7 agent messaging approaches: A2A, email, Slack, custom protocols
StrongCoffee85 · reddit · 2026-11-12
A Reddit thread (from the creator of the fmsg protocol) maps the agent communication landscape in a 7-way comparison table: A2A (strong specs, low adoption, task-only), IM apps (great UX, platform lock-in), group chat tools (intra-org only), email (universal but spam-prone), private networking like Tailscale (self-only), custom APIs (bespoke glue), and fmsg itself (durable threads, self-hostable, cryptographically verifiable, but too new). MCP is excluded as agent-to-tool rather than human-to-agent or agent-to-agent messaging. The author asks what the landscape map is missing.
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