fix: require user to specify the provider

README.md

@@ -18,13 +18,17 @@ bun install # or use `mise install`
 
 ## Quick start
 
-**1. Create a config file**
+**1. Initialize workspace**
 
 ```bash
-mkdir -p ~/.config/nanobot
+bun run nanobot onboard
 ```
 
-`~/.config/nanobot/config.json`:
+This creates `~/.config/nanobot/` with a config file and templates.
+
+**2. Edit config**
+
+Add your API key and set provider/model:
 
 ```json
 {
@@ -34,12 +38,13 @@ mkdir -p ~/.config/nanobot
     }
   },
   "agent": {
-    "model": "openrouter/anthropic/claude-sonnet-4-5"
+    "provider": "openrouter",
+    "model": "anthropic/claude-sonnet-4-5"
   }
 }
 ```
 
-**2. Chat**
+**3. Chat**
 
 ```bash
 bun run nanobot agent
@@ -115,7 +120,8 @@ Environment variable overrides:
 ```json
 {
   "agent": {
-    "model": "openrouter/anthropic/claude-sonnet-4-5",
+    "provider": "openrouter",
+    "model": "anthropic/claude-sonnet-4-5",
     "workspacePath": "~/.config/nanobot",
     "maxTokens": 4096,
     "contextWindowTokens": 65536,
@@ -164,17 +170,27 @@ Environment variable overrides:
 }
 ```
 
-### Providers
+### Provider
 
-Model names use a `provider/model` prefix scheme:
+The `agent.provider` field is **required** and must be one of:
 
-| Prefix | Provider | Example |
-|--------|----------|---------|
-| `anthropic/` | Anthropic direct | `anthropic/claude-opus-4-5` |
-| `openai/` | OpenAI direct | `openai/gpt-4o` |
-| `google/` | Google direct | `google/gemini-2.5-pro` |
-| `openrouter/` | OpenRouter (any model) | `openrouter/anthropic/claude-sonnet-4-5` |
-| `ollama/` | Local Ollama | `ollama/llama3.2` |
+| Provider | Description |
+|----------|-------------|
+| `anthropic` | Anthropic direct (Claude models) |
+| `openai` | OpenAI direct (GPT models) |
+| `google` | Google direct (Gemini models) |
+| `openrouter` | OpenRouter (access to many models) |
+| `ollama` | Local Ollama instance |
+
+The `agent.model` field is also **required** and should be the model ID without any provider prefix:
+
+| Provider | Example Model |
+|----------|---------------|
+| `anthropic` | `claude-sonnet-4-5`, `claude-opus-4-5` |
+| `openai` | `gpt-4o`, `gpt-4o-mini` |
+| `google` | `gemini-2.5-pro`, `gemini-2.0-flash` |
+| `openrouter` | `anthropic/claude-sonnet-4-5` (OpenRouter uses its own model IDs) |
+| `ollama` | `llama3.2`, `qwen2.5` |
 
 For Ollama, set `providers.ollama.apiBase` (default: `http://localhost:11434/api`).