Feather – a fresh Tcl reimplementation (WASM, Go)
Hey HN! First time showing something here, but I've been furiously working over the holidays on Feather, a from scratch reimplementation of TCL designed for embedding in modern applications. It's starting out as a faithful reimplementation of TCL without I/O, OOP features, or coroutines. TCL has a special place in my heart because the syntax is so elegant for interactive use, and defining domain specific languages. My motiviation is twofold: faster feedback loops for AI, and moldable software for users. It turns out giving AI agents access to the runtime state of your program makes for…
Feather – a fresh Tcl reimplementation (WASM, Go) launched on December 27, 2025 with 31 votes, #501 of 11,628 launches that month and more than 90% of that year's launches.
In plain words
Feather is a from-scratch reimplementation of Tcl designed for embedding in modern applications, available as WebAssembly and Go versions. It provides Tcl's elegant syntax for interactive use and domain-specific languages without I/O, object-oriented, or coroutine features. Built to enable faster feedback loops for AI agents accessing program runtime state and to support moldable software experiences, Feather avoids the complications of embedding traditional Tcl with its bundled event loop and GUI framework.
written from the facts on this page · September 2026
From the sources
Feather is an embeddable TCL interpreter for adding interactive command shells to any application.
Effortlessly add a command shell to your application: for your users, and your agents. Designed from the ground up to be embedded into host applications. No I/O, no event loop - your host stays in control. Every aspect of a running Feather program can be inspected and modified from within, perfect for debugging and agentic coding. A faithful implementation of the TCL core language with control flow, data structures, metaprogramming, and string manipulation. Just like Bash and zsh let you drive a Unix system, Feather lets you drive your application in the same spirit. No I/O by default : Feather cannot communicate with the outside world, until you explicitly provide facilities for doing so.…from feather-lang.dev
In the maker’s words, at launch
Hey HN! First time showing something here, but I've been furiously working over the holidays on Feather, a from scratch reimplementation of TCL designed for embedding in modern applications. It's starting out as a faithful reimplementation of TCL without I/O, OOP features, or coroutines. TCL has a special place…
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Community, All the HN belong to you. This is an archive of hacker news that fits in your browser. When I made HN Made of Primes I realized I could probably do this offline sqlite/wasm thing with the whole GBs of archive. The whole dataset. So I tried it, and this is it. Have Hacker News on your device. Go to this repo (https://github.com/DOSAYGO-STUDIO/HackerBook): you can download it. Big Query -> ETL -> npx serve docs - that's it. 20 years of HN arguments and beauty, can be yours forever. So they'll never die. Ever. It's the unkillable static archive of HN and it's…
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