2026-07-17 00:22 UTCIn-site rewrite2 min readUpdated: 2026-10-02 02:36 UTC

Show HN: Forall – Spec-driven AI coding with formal verification

Summary

Astrio releases Forall (∀), a coding agent that generates code alongside machine-checkable proofs from user-written specifications. Available as a full CLI agent or a verify-only MCP integration, it currently supports TypeScript, Java, and Rust under the Apache-2.0 license.

SourceHacker News AIAuthor: Nolan_Lwin

Report an error

The correction channel is not available yet. You can copy the article reference below for later.

Correction instructions

Read article

Uh oh!

There was an error while loading. Please reload this page.

Notifications You must be signed in to change notification settings

Fork 21

Star 160

BranchesTags

Open more actions menu

Folders and files

NameName

Last commit message

Last commit date

Latest commit

History

35 Commits

.forall

.github

assets

crates

docs

examples

packages

skills

.gitignore

CHANGELOG.md

CODE_OF_CONDUCT.md

CONTRIBUTING.md

Cargo.lock

Cargo.toml

LICENSE

README.md

SECURITY.md

install.sh

Repository files navigation

Forall is a coding agent from Astrio that helps developers build correct software by generating spec-driven code alongside machine-checkable proofs.

Two ways to use Forall

Install Forall CLI

Full coding agent — specs, proofs, and workflow in your terminal.

curl -fsSL https://forall.astrio.app/install.sh | bash forall

Add ~/.local/bin to your PATH if needed, then run forall --version.

On first launch, sign in with a Forall account (API key) or bring your own model API key (OpenAI / OpenRouter). Then forall init in a git repo and start working.

Note: A binary release must exist on GitHub Releases before install succeeds.

MCP verify-only

Stay on Cursor, Claude Code, or Codex — add hosted verification via MCP. Do not install the CLI.

Create an API key at forall.astrio.app/dashboard

Add to your MCP client:

{ "mcpServers": { "forall": { "command": "npx", "args": ["-y", "@astrio/forall-mcp"], "env": { "FORALL_API_KEY": "forall_..." } } } }

Your coding agent edits the workspace from verify reports. See docs/getting-started.md and docs/hosted-mcp.md.

Supported programming languages

TypeScript

Java

Rust

We are expanding to more languages based on demand.

Connect

Join our Discord and X communities.

License

This repository is licensed under the Apache-2.0 License.

About

Forall (∀) is a coding agent from Astrio that helps developers build correct software by generating spec-driven code alongside machine-checkable proofs.

Topics

java

rust

typescript

Resources

Readme

License

Apache-2.0 license

Code of conduct

Contributing

Security policy

Uh oh!

There was an error while loading. Please reload this page.

Activity

Custom properties

Stars

160 stars

Watchers

3 watching

Forks

21 forks

Report repository

Releases 1

Forall v0.1.0

Latest

Jul 10, 2026

Uh oh!

There was an error while loading. Please reload this page.

Contributors

Uh oh!

There was an error while loading. Please reload this page.

Languages

Rust 95.2%

Shell 3.3%

JavaScript 1.5%

Key points and analysis

Article intelligence

EngineersIntermediate

Key points

Forall is a specification-driven AI coding agent that produces both code and formal proofs.
Offers two modes: full CLI agent and MCP verify-only integration with existing IDEs.
Currently supports TypeScript, Java, and Rust, with more languages planned.

Why it matters

This matters because Forall introduces a new paradigm where AI generates code and machine-checkable proofs from user specifications, potentially reducing software bugs and improving reliability.

Highlights and analysis are generated automatically and may contain errors. Check the original source.

Article intelligence

Key points

Why it matters

More recent stories on this topic · Agents