Add warning about anthropic api key usage (#125)

* Add warning about anthropic api key usage

* Update supported claude code models

Author: kevinvandijk

docs/providers/claude-code.md

@@ -14,12 +14,24 @@ Claude Code is Anthropic's official CLI that provides direct access to Claude mo
 2. **Authenticate:** Run `claude` in your terminal. Claude Code offers multiple authentication options including the Anthropic Console (default), Claude App with Pro/Max plans, and enterprise platforms like Amazon Bedrock or Google Vertex AI. See [Anthropic's authentication documentation](https://docs.anthropic.com/en/docs/claude-code/setup) for complete details.
 3. **Verify Installation:** Test that everything works by running `claude --version` in your terminal.
 
+:::warning Environment Variable Usage
+The `claude` command-line tool, like other Anthropic SDKs, can use the `ANTHROPIC_API_KEY` environment variable for authentication. This is a common method for authorizing CLI tools in non-interactive environments.
+
+If this environment variable is set on your system, the `claude` tool may use it for authentication instead of the interactive `/login` method. When Kilo Code executes the tool, it will accurately reflect that an API key is being used, as this is the underlying behavior of the `claude` CLI itself.
+:::
+
+**Website:** [https://docs.anthropic.com/en/docs/claude-code/setup](https://docs.anthropic.com/en/docs/claude-code/setup)
+
 ## Supported Models
 
 Kilo Code supports the following Claude models through Claude Code:
 
-*   `claude-sonnet-4` (Recommended)
-*   `claude-4-opus`
+- **Claude Opus 4.1** (Most capable)
+- **Claude Opus 4**
+- **Claude Sonnet 4** (Latest, recommended)
+- **Claude 3.7 Sonnet**
+- **Claude 3.5 Sonnet**
+- **Claude 3.5 Haiku** (Fast responses)
 
 The specific models available depend on your Claude subscription and plan. See [Anthropic's Model Documentation](https://docs.anthropic.com/en/docs/about-claude/models) for more details on each model's capabilities.
 
@@ -32,16 +44,16 @@ The specific models available depend on your Claude subscription and plan. See [
 
 ## Tips and Notes
 
-*   **No API Keys Required:** Claude Code uses your existing CLI authentication, so you don't need to manage separate API keys.
-*   **Cost Transparency:** Usage costs are reported directly by the Claude CLI, giving you clear visibility into your spending.
-*   **Advanced Reasoning:** Full support for Claude's thinking modes and reasoning capabilities when available.
-*   **Context Windows:** Claude models have large context windows, allowing you to include significant amounts of code and context in your prompts.
-*   **Enhance Prompt Feature:** Full compatibility with Kilo Code's Enhance Prompt feature, allowing you to automatically improve and refine your prompts before sending them to Claude.
-*   **Custom Paths:** If you installed Claude Code in a non-standard location, you can specify the full path in the settings. Examples:
-    *   Windows: `C:\tools\claude\claude.exe`
-    *   macOS/Linux: `/usr/local/bin/claude` or `~/bin/claude`
+- **No API Keys Required:** Claude Code uses your existing CLI authentication, so you don't need to manage separate API keys.
+- **Cost Transparency:** Usage costs are reported directly by the Claude CLI, giving you clear visibility into your spending.
+- **Advanced Reasoning:** Full support for Claude's thinking modes and reasoning capabilities when available.
+- **Context Windows:** Claude models have large context windows, allowing you to include significant amounts of code and context in your prompts.
+- **Enhance Prompt Feature:** Full compatibility with Kilo Code's Enhance Prompt feature, allowing you to automatically improve and refine your prompts before sending them to Claude.
+- **Custom Paths:** If you installed Claude Code in a non-standard location, you can specify the full path in the settings. Examples:
+  - Windows: `C:\tools\claude\claude.exe`
+  - macOS/Linux: `/usr/local/bin/claude` or `~/bin/claude`
 
 ## Troubleshooting
 
-*   **"Claude Code process exited with error":** Verify Claude Code is installed (`claude --version`) and authenticated (`claude auth login`). Make sure your subscription includes the selected model.
-*   **Custom path not working:** Use the full absolute path to the Claude executable and verify the file exists and is executable. On Windows, include the `.exe` extension.
+- **"Claude Code process exited with error":** Verify Claude Code is installed (`claude --version`) and authenticated (`claude auth login`). Make sure your subscription includes the selected model.
+- **Custom path not working:** Use the full absolute path to the Claude executable and verify the file exists and is executable. On Windows, include the `.exe` extension.