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Anvil

Show HN: Anvil – Desktop App for Spec Driven Development

53 AI Score
Show_hn other Added Mar 28, 2026

Details

Sector
other
Total Funding
$0
Last Round
$0

About

Very excited to share Anvil. I built Anvil to take back control when working with parallel coding agents. It comes with one click worktree isolation, and first class spec support.<p>Claude Code and similar coding TUIs are very eager to get into writing code, even before their human baby sitter fully understands the implication of what they are about to build.<p>The core insight with Anvil is that it is much easier to write high quality code which matches the author&#x27;s intent after iterating on an external plan with your agent.<p>Align on the architecture, implementation, and verification strategy in a markdown file, then execution is pretty straightforward.<p>This is not a new concept, but the user experience within TUI apps for this workflow is pretty shit. Claude creates non-semantic plan names like &quot;aquamarine-owl&quot; that are trapped within a single agent context. Spinning up multiple agents to check on different aspects of a plan is annoying and slow, and managing terminal tabs is pure hell.<p>So I built anvil, this is a fully open source (MIT license) project.

AI Score Reasoning

Anvil addresses a sophisticated pain point in the rapidly growing AI agent space by prioritizing structured planning over impulsive code generation. However, it currently lacks measurable traction, faces intense competition from incumbents like Cursor and GitHub, and its open-source nature presents challenges for building a defensible commercial moat.

Source

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