OSS
Show HN's Top Project Today Is mcptoon, Which Claims 97% Token Savings on MCP Tool Discovery by Dropping JSON for TOON
activeing123/mcptoon took the top Show HN slot at 54 points and 38 comments this morning — an MCP CLI client that connects to any stdio or HTTP MCP server and emits TOON (Token-Optimized Object Notation) instead of JSON schema, claiming 97% fewer tokens on tool discovery and 40–60% on results. The argument is that MCP overhead runs 40,000–70,000 tokens before any reasoning happens, eating 30–55% of a 128K window. It is zero-dependency pure Python at roughly 50KB, Apache 2.0, and works with anything that can run a shell command; the savings figures are the author's own and remain unverified by third parties.
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