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# Hexai configuration
This page explains where the config lives and how to choose a style; the authoritative list of options and comments lives in the example file.
Config file
- Location: `$XDG_CONFIG_HOME/hexai/config.toml` (usually `~/.config/hexai/config.toml`).
- Style: sectioned tables only — see [config.toml.example](../config.toml.example) for a complete, commented reference.
Environment overrides
- All options can be overridden by environment variables prefixed with `HEXAI_`.
- Env values take precedence over the config file.
- Examples:
- `HEXAI_PROVIDER`, `HEXAI_MAX_TOKENS`, `HEXAI_CONTEXT_MODE`, `HEXAI_CONTEXT_WINDOW_LINES`, `HEXAI_MAX_CONTEXT_TOKENS`, `HEXAI_LOG_PREVIEW_LIMIT`
- `HEXAI_CODING_TEMPERATURE`
- `HEXAI_COMPLETION_DEBOUNCE_MS`, `HEXAI_COMPLETION_THROTTLE_MS`
- `HEXAI_TRIGGER_CHARACTERS` (comma-separated, e.g., `".,:,_ , "`)
- `HEXAI_INLINE_OPEN`, `HEXAI_INLINE_CLOSE`
- `HEXAI_CHAT_SUFFIX`, `HEXAI_CHAT_PREFIXES` (comma-separated)
- `HEXAI_OPENAI_MODEL`, `HEXAI_OPENAI_BASE_URL`, `HEXAI_OPENAI_TEMPERATURE`
- `HEXAI_COPILOT_MODEL`, `HEXAI_COPILOT_BASE_URL`, `HEXAI_COPILOT_TEMPERATURE`
- `HEXAI_OLLAMA_MODEL`, `HEXAI_OLLAMA_BASE_URL`, `HEXAI_OLLAMA_TEMPERATURE`
API keys:
- OpenAI: prefer `HEXAI_OPENAI_API_KEY`, falling back to `OPENAI_API_KEY`.
- Copilot: prefer `HEXAI_COPILOT_API_KEY`, falling back to `COPILOT_API_KEY`.
Selecting a provider
- Sectioned: set `[provider] name = "openai" | "copilot" | "ollama"`.
- If omitted, Hexai defaults to `openai`.
Notes on Ollama:
- Ensure the model is available locally (e.g., `ollama pull qwen3-coder:30b-a3b-q4_K_M`).
- Alternatively, run Ollama in OpenAI‑compatible mode and use the OpenAI provider with
`openai_base_url` pointed at your local endpoint.
Hexai Action (TUI) configuration
This is mostly useful when Helix runs in a [tmux](https://tmux.github.io/) session!
- Helix integration (recommended): bind a key to pipe the current selection to `hexai-tmux-action` and replace it with the output.
- Example: `C-a = ":pipe hexai-tmux-action"`
- Default behavior:
- Inline TUI when run in a real terminal (TTY).
- When invoked via Helix `:pipe`, `hexai-tmux-action` opens a split pane to render the menu and returns the result on stdout for Helix to apply.
- If no TTY and no tmux are available, it falls back to echoing the input.
- Flags:
- `--infile` Read input from the given file instead of stdin.
- `--outfile` Write output to the given file instead of stdout (truncates/creates).
- `--tmux-target` tmux target pane/window (advanced).
- `--tmux-split v|h` split orientation (default: `v`).
- `--tmux-percent N` split size percentage (default: `33`).
- `--ui-child` internal; used by the parent process when spawning inside tmux.
Editor integration
- Hexai tries to launch your preferred editor when needed (e.g., TUI “Custom prompt”, CLI with no args).
- Editor resolution: `HEXAI_EDITOR`, falling back to `EDITOR` when unset.
- Invocation form: `EDITOR /tmp/hexai-XXXX.md` (a temporary Markdown file).
Tmux status line
See the [tmux integration guide](docs/tmux.md) for details on configuring the status line.
Code action prompts
- All prompts can be customized under `[prompts.code_action]` in `config.toml`. In addition to `rewrite_*`, `diagnostics_*`, `document_*`, and `go_test_*`, the following templates control the “Simplify and improve” action:
- `simplify_system`
- `simplify_user` (uses `{{selection}}`)
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