Acknowledgements

Veyyon stands on the work of others, and we credit it plainly. The handbook keeps this as a footnote on purpose: Veyyon’s public docs explain Veyyon’s behavior first, while detailed competitive study stays in private research notes.

• oh-my-pi (can1357/oh-my-pi), under the MIT license. Veyyon is a fork of oh-my-pi: the TypeScript/Bun agent loop and TUI, the pi-* Rust natives (grep, PTY, hashline edits), provider breadth, role routing, session-tree work, and edit ergonomics all carry forward from it. Incorporated MIT code keeps its permission notice; see the repository LICENSE.
• codex, by OpenAI, under the Apache 2.0 license. oh-my-pi and Veyyon carry forward the codex apply_patch patch format and parts of the agent-loop shape as an independent TypeScript reimplementation — see NOTICE for exactly which files are format-compatible versus which actually vendor Apache 2.0 code (the OpenAI wire types and the Playwright ARIA-snapshot bundle do; the apply_patch parser and the Codex backend client do not).
• OpenCode, under the MIT license. Veyyon studies its plan/build workflow, project memory, compact command, and file-context UI ideas.
• Lossless Claw, under the MIT license. Veyyon studies its summary DAG, fresh-tail compaction, and compacted-history inspection tools.
• command-code, by Langbase. command-code is proprietary. Veyyon only studies observable mechanisms clean-room, copying no code or bundled implementation text.

The ideas here are reimplemented in Veyyon’s own design, tested to Veyyon’s own bar, and extended past where we found them. Legal provenance and upstream notices live in the repository LICENSE, NOTICE, and UPSTREAM.md.