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Tachiko Work
Semantic spreadsheets where AI proposes, Rust verifies.
Tachiko Work is a semantic workspace for structured data where humans and AI operate on typed meaning instead of raw cells. For the GPT-6 Astra Challenge, Astra turns natural-language intent into typed proposals; Tachiko’s deterministic Rust engine validates formulas, dependencies, and impact before anything changes. Tachiko Sheet provides the familiar spreadsheet experience on top. Public pre-alpha.
I started building Tachiko Work because spreadsheets are incredibly useful, but once they become real operational systems, their meaning gets buried in cell positions, formulas, exports, scripts, and manual review.
I wanted a workspace where the structure itself is explicit: typed data, stable identities, formulas, dependencies, validation, and semantic changes all live in one model.
That also changes how AI can work with spreadsheets. Instead of letting a model directly manipulate cells or files, GPT-6 Astra can reason about the user’s intent and propose a typed semantic change. Tachiko then independently calculates the consequences, validates the result, and asks for approval before applying it.
For this challenge, I’m exploring that boundary between probabilistic reasoning and deterministic execution: Astra reasons; Tachiko verifies.
Tachiko Work is still a public pre-alpha, and I’d especially love feedback on this approach to AI-native structured work.
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About Tachiko Work on Product Hunt
“Semantic spreadsheets where AI proposes, Rust verifies.”
Tachiko Work was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #225 on the daily leaderboard. Tachiko Work is a semantic workspace for structured data where humans and AI operate on typed meaning instead of raw cells. For the GPT-6 Astra Challenge, Astra turns natural-language intent into typed proposals; Tachiko’s deterministic Rust engine validates formulas, dependencies, and impact before anything changes. Tachiko Sheet provides the familiar spreadsheet experience on top. Public pre-alpha.
Tachiko Work was featured in Spreadsheets (9.9k followers), Developer Tools (521.6k followers), Artificial Intelligence (481.7k followers) and GitHub (41.4k followers) on Product Hunt. Together, these topics include over 254.5k products, making this a competitive space to launch in.
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