Fix xAI API endpoint URL

- Changed XAI_API_HOST from 'https://api.x.ai' to 'https://api.x.ai/v1'
- Updated URL joining to append 'chat/completions' instead of 'v1/chat/completions'
- This creates the correct endpoint: https://api.x.ai/v1/chat/completions
- Updated UI provider registry with correct default host
- Tested with curl and confirmed API returns proper 400 auth error instead of 404

Author: jack

.goose/memory/project improvement ideas.txt

@@ -0,0 +1,26 @@
+# ["xai", "grok", "provider", "implementation", "complete"]
+Successfully added xAI provider support for Grok models to Goose:
+
+**What was implemented:**
+1. Created new XaiProvider in `crates/goose/src/providers/xai.rs`
+2. Added support for all Grok models: grok-3, grok-3-fast, grok-3-mini, grok-3-mini-fast, grok-2-vision-1212, grok-2-image-1212, etc.
+3. Uses x.ai's OpenAI-compatible API at https://api.x.ai/v1/chat/completions
+4. Requires XAI_API_KEY environment variable
+5. Optional XAI_HOST configuration (defaults to https://api.x.ai)
+6. Updated provider factory and registry to include xAI
+7. Added xAI to GUI provider registry in ProviderRegistry.tsx
+8. Includes proper error handling for auth, rate limits, server errors
+
+**How to use:**
+- CLI: Set XAI_API_KEY env var, then use `--provider xai --model grok-3`
+- GUI: Configure xAI provider in Settings with API key
+
+**Key files modified:**
+- crates/goose/src/providers/xai.rs (new)
+- crates/goose/src/providers/mod.rs (added xai module)
+- crates/goose/src/providers/factory.rs (added XaiProvider to registry)
+- ui/desktop/src/components/settings/providers/ProviderRegistry.tsx (added xAI UI config)
+
+**Branch:** feature/add-grok-models
+**Commit:** ff54e6d576
+

crates/goose/src/providers/xai.rs

@@ -12,7 +12,7 @@ use serde_json::Value;
 use std::time::Duration;
 use url::Url;
 
-pub const XAI_API_HOST: &str = "https://api.x.ai";
+pub const XAI_API_HOST: &str = "https://api.x.ai/v1";
 pub const XAI_DEFAULT_MODEL: &str = "grok-3";
 pub const XAI_KNOWN_MODELS: &[&str] = &[
     "grok-3",
@@ -75,7 +75,7 @@ impl XaiProvider {
     async fn post(&self, payload: Value) -> anyhow::Result<Value, ProviderError> {
         let base_url = Url::parse(&self.host)
             .map_err(|e| ProviderError::RequestFailed(format!("Invalid base URL: {e}")))?;
-        let url = base_url.join("v1/chat/completions").map_err(|e| {
+        let url = base_url.join("chat/completions").map_err(|e| {
             ProviderError::RequestFailed(format!("Failed to construct endpoint URL: {e}"))
         })?;
 

ui/desktop/src/components/settings/providers/ProviderRegistry.tsx

@@ -111,7 +111,7 @@ export const PROVIDER_REGISTRY: ProviderRegistry[] = [
         {
           name: 'XAI_HOST',
           is_secret: false,
-          default: 'https://api.x.ai',
+          default: 'https://api.x.ai/v1',
         },
       ],
     },