| 1 | # Model Configuration |
| 2 | |
| 3 | Manage the reusable model presets used for Agent Zero's main, utility, and embedding models. |
| 4 | |
| 5 | ## Model Presets |
| 6 | |
| 7 | - `Default` is always present, appears first, and cannot be renamed or deleted. |
| 8 | - Every runtime configuration resolves from a preset. There is no separate durable model configuration layer. |
| 9 | - Preset definitions are global and live in `usr/plugins/_model_config/presets.yaml`. Plugin defaults in `mode_presets_fallback.yaml` are used only when a saved collection cannot be initialized. |
| 10 | - Non-default presets may omit advanced fields or model slots; omitted values resolve from `Default`, while provider-specific `kwargs` are replaced or cleared instead of leaking between providers. |
| 11 | - API keys remain in the approved environment/settings flow and are never written into preset YAML. |
| 12 | |
| 13 | ## Scoped Selection |
| 14 | |
| 15 | Global, project, project/profile, and agent-profile scopes store only a preset name in their standard plugin `config.json`: |
| 16 | |
| 17 | ```json |
| 18 | {"model_preset": "Balance"} |
| 19 | ``` |
| 20 | |
| 21 | For example, a project selection is stored at: |
| 22 | |
| 23 | ```text |
| 24 | /a0/usr/projects/<project>/.a0proj/plugins/_model_config/config.json |
| 25 | ``` |
| 26 | |
| 27 | The normal plugin resolution order selects the most specific available reference. A missing or deleted reference safely resolves to `Default`. Chats may store an explicit preset reference in `chat_model_override`; clearing it returns the chat to its scoped selection. |
| 28 | |
| 29 | ## User Interfaces |
| 30 | |
| 31 | - Agent Settings shows the global selection, its three resolved models, and actions for preset editing, API keys, and per-project/agent settings. |
| 32 | - The full plugin settings modal uses the generic scope selector and stores only the chosen preset at that scope. |
| 33 | - The closed chat switcher shows the effective preset plus the main model's short name; its menu supports a chat-only selection or returning to the scoped preset. |
| 34 | - The adjacent profile switcher shows the active agent's effective title and avatar and links to Create, Edit, and Manage agents. |
| 35 | - The preset editor exposes the shared API key for each selected provider and saves key changes separately from secret-free preset definitions. |
| 36 | - Project Settings selects from the same global preset definitions. |
| 37 | |
| 38 | ## Initial Presets And Migration |
| 39 | |
| 40 | The startup migration converts the prior global full model configuration into `Default`, preserves existing global presets, promotes distinct scoped full configurations and legacy project presets into uniquely named global presets, and rewrites scoped config files to selection-only JSON. Original files receive a `.pre-unified-presets.bak` backup before replacement; the migration is idempotent. |
| 41 | |
| 42 | At every startup, legacy migration runs first. If `usr/plugins/_model_config/presets.yaml` then exists, initialization returns immediately without network access. Otherwise the plugin makes one bounded request for [`agent0ai/a0-presets/model_presets.yaml`](https://github.com/agent0ai/a0-presets/blob/main/model_presets.yaml), validates the whole collection, removes secret fields, and saves it locally. A download, parse, or validation failure processes and saves plugin-local `mode_presets_fallback.yaml` through the same validation path, so initialization remains usable offline. |
| 43 | |
| 44 | ## Key Files |
| 45 | |
| 46 | - `helpers/model_config.py` owns preset validation, resolution, compatibility config shapes, and runtime model construction. |
| 47 | - `api/model_presets.py` owns global preset editing, scoped selection, and reference repair after rename/delete/reset. |
| 48 | - `extensions/python/startup_migration/_10_migrate_model_config.py` owns legacy conversion. |
| 49 | - `extensions/python/startup_migration/_20_bootstrap_model_presets.py` owns missing-collection initialization and plugin-local fallback. |
| 50 | - `webui/preset-overview.html` is the shared Settings/plugin-settings summary widget. |
| 51 | - `webui/main.html` is the preset editor. |
| 52 | |
| 53 | ## Plugin Metadata |
| 54 | |
| 55 | - Name: `_model_config` |
| 56 | - Settings section: `agent` |
| 57 | - Per-project config: `true` |
| 58 | - Per-agent config: `true` |
| 59 | - Always enabled: `true` |