yo
Copyright (C) 2026 martona

This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License version 3, as published
by the Free Software Foundation. See the LICENSE file for the full text.


DERIVATIVE-WORK NOTICE
======================

`yo` is a derivative work of yoshell ("yosh"):

    yoshell — https://github.com/pizlonator/yosh
    Copyright (C) the yoshell authors (pizlonator and contributors)
    Licensed under the GNU General Public License v3.

yoshell is itself a fork of GNU Bash 5.2.32 and GNU Readline 8.2.13
(Copyright (C) the Free Software Foundation), both GPLv3, with an added
LLM "yo" feature implemented in `readline-8.2.13/yo.c`.

`yo` does NOT copy or fork the Bash/Readline C codebase. What it reuses
from yoshell — and what makes it a derivative work — is the design and
expression of that "yo" feature:

  * the command name `yo`;
  * the LLM system prompts and tool/response descriptions (reused
    largely verbatim);
  * the response/tool-calling contract (the `command` / `chat` /
    `scrollback` / `docs` tools) and the multi-step continuation
    protocol.

Because that reused material is GPLv3-licensed expression, `yo` is
distributed under the GPLv3 as well.


SIGNIFICANT CHANGES FROM THE ORIGINAL (GPLv3 section 5)
======================================================

`yo` re-expresses yoshell's "yo" feature as a standalone tool, not a
shell. Notable differences from yoshell:

  * Standalone native binary, invoked as `yo <text>`, rather than a fork
    of GNU Bash / Readline.
  * Shell integration via small per-shell snippets (bash / zsh /
    PowerShell) that drive each shell's own line editor, instead of a
    patched GNU Readline.
  * Terminal scrollback obtained from a terminal multiplexer
    (tmux / zellij), opt-in, instead of yoshell's PTY-proxy capture.
  * Memory safety provided by the implementation language, instead of
    yoshell's Fil-C build.

The list above is the set of significant changes from yoshell, as required by
the GPL.


BUNDLED THIRD-PARTY COMPONENTS
==============================

The compiled `yo` binary statically links the following, whose licenses are
compatible with GPLv3 and whose copyright/permission notices are retained:

  * gitleaks - https://github.com/gitleaks/gitleaks
    Copyright (c) 2019 Zachary Rice
    Licensed under the MIT License.
    Used as the secret-detection engine for outbound redaction
    (internal/redact); its default ruleset is embedded in the binary.

gitleaks pulls in further transitive Go dependencies under permissive
licenses (MIT / BSD / Apache-2.0). A complete third-party license listing ships
with release builds as THIRD-PARTY-LICENSES.txt.