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Wantzel Studio
free and open source

A programming language built for AI-written code

Wantzel compiles in milliseconds to small, dependency-free binaries. Strict checks and clear errors help agents correct mistakes after every change.

View the source on GitHub. With Wantzel Studio, you can run and supervise coding agents in one workspace.

Source on GitHub Wantzel Studio
your codeone file
code in, one file out
  1. a programbinary or error, in milliseconds
    the loop

    Fast enough to compile after every change

    Your agent writes a program. Within milliseconds Wantzel returns a compiled binary or an error message; the agent corrects, and the loop repeats.

Try it

curl -fsSLo wantzel \
  https://github.com/wantzel/wantzel/releases/latest/download/wantzel-linux-x86_64
chmod +x wantzel
printf '%s\n' 'import io; begin io.puts(STDOUT, "hello\n"); end.' > hello.wz
./wantzel hello.wz hello && ./hello

That is the whole installation: one file, nothing to build.

Why Wantzel

AI-generated code can look correct while still containing mistakes. Wantzel rejects invalid programs early and reports the file, line and reason.

  1. 10 ms
    fast feedback

    Fast feedback

    Compiles its own 8,100 lines in about 10 ms.

  2. one fileno packages
    nothing to install

    No dependencies

    The compiler and generated programs are static binaries. No packages or runtime to install.

  3. hello.wz : 50expected ";"found "end"
    errors an agent can act on

    Clear errors

    Rejected code reports the file, line and reason.

Explore

Read the language reference or browse complete examples, including MCP and HTTP servers, an HTTPS client and server, a file server and an OAuth flow. TLS 1.3 is written in Wantzel itself, without OpenSSL.

Wantzel is MIT licensed. Questions: floris@wantzel.com.

Language reference Examples