feat: expose modelOverrides setting in ConfigSidebar

src-tauri/src/config.rs

@@ -1,3 +1,5 @@
+use std::collections::HashMap;
+
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
@@ -46,6 +48,9 @@ pub struct ClaudeStartOptions {
 
     #[serde(default)]
     pub auto_memory_directory: Option<String>,
+
+    #[serde(default)]
+    pub model_overrides: Option<HashMap<String, String>>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -192,6 +197,9 @@ pub struct HikariConfig {
 
     #[serde(default)]
     pub auto_memory_directory: Option<String>,
+
+    #[serde(default)]
+    pub model_overrides: Option<HashMap<String, String>>,
 }
 
 impl Default for HikariConfig {
@@ -242,6 +250,7 @@ impl Default for HikariConfig {
             include_git_instructions: true,
             enable_claudeai_mcp_servers: true,
             auto_memory_directory: None,
+            model_overrides: None,
         }
     }
 }
@@ -392,6 +401,7 @@ mod tests {
         assert!(config.include_git_instructions);
         assert!(config.enable_claudeai_mcp_servers);
         assert!(config.auto_memory_directory.is_none());
+        assert!(config.model_overrides.is_none());
     }
 
     #[test]
@@ -442,6 +452,10 @@ mod tests {
             include_git_instructions: false,
             enable_claudeai_mcp_servers: false,
             auto_memory_directory: Some("/custom/memory".to_string()),
+            model_overrides: Some(HashMap::from([(
+                "claude-opus-4-6".to_string(),
+                "arn:aws:bedrock:us-east-1::foundation-model/anthropic.claude-opus-4-6-v1".to_string(),
+            )])),
         };
 
         let json = serde_json::to_string(&config).unwrap();
@@ -466,6 +480,12 @@ mod tests {
             deserialized.auto_memory_directory,
             Some("/custom/memory".to_string())
         );
+        assert!(deserialized.model_overrides.is_some());
+        let overrides = deserialized.model_overrides.unwrap();
+        assert_eq!(
+            overrides.get("claude-opus-4-6").map(String::as_str),
+            Some("arn:aws:bedrock:us-east-1::foundation-model/anthropic.claude-opus-4-6-v1")
+        );
     }
 
     #[test]

src-tauri/src/wsl_bridge.rs

@@ -291,10 +291,39 @@ impl WslBridge {
                 cmd.arg("--worktree");
             }
 
-            // Pass auto-memory directory via settings if specified
-            if let Some(ref dir) = options.auto_memory_directory {
-                if !dir.is_empty() {
-                    cmd.args(["--settings", &format!(r#"{{"autoMemoryDirectory":"{}"}}"#, dir)]);
+            // Pass combined settings via --settings flag if any settings are specified
+            {
+                let has_memory_dir = options
+                    .auto_memory_directory
+                    .as_deref()
+                    .map(|d| !d.is_empty())
+                    .unwrap_or(false);
+                let has_overrides = options
+                    .model_overrides
+                    .as_ref()
+                    .map(|m| !m.is_empty())
+                    .unwrap_or(false);
+
+                if has_memory_dir || has_overrides {
+                    let mut settings = serde_json::Map::new();
+                    if let Some(ref dir) = options.auto_memory_directory {
+                        if !dir.is_empty() {
+                            settings.insert(
+                                "autoMemoryDirectory".to_string(),
+                                serde_json::Value::String(dir.clone()),
+                            );
+                        }
+                    }
+                    if let Some(ref overrides) = options.model_overrides {
+                        if !overrides.is_empty() {
+                            if let Ok(val) = serde_json::to_value(overrides) {
+                                settings.insert("modelOverrides".to_string(), val);
+                            }
+                        }
+                    }
+                    if let Ok(settings_json) = serde_json::to_string(&settings) {
+                        cmd.args(["--settings", &settings_json]);
+                    }
                 }
             }
 
@@ -441,14 +470,40 @@ impl WslBridge {
                 claude_cmd.push_str(" --worktree");
             }
 
-            // Pass auto-memory directory via settings if specified
-            if let Some(ref dir) = options.auto_memory_directory {
-                if !dir.is_empty() {
-                    let escaped_dir = dir.replace('\'', "'\\''");
-                    claude_cmd.push_str(&format!(
-                        " --settings '{{\"autoMemoryDirectory\":\"{}\"}}'",
-                        escaped_dir
-                    ));
+            // Pass combined settings via --settings flag if any settings are specified
+            {
+                let has_memory_dir = options
+                    .auto_memory_directory
+                    .as_deref()
+                    .map(|d| !d.is_empty())
+                    .unwrap_or(false);
+                let has_overrides = options
+                    .model_overrides
+                    .as_ref()
+                    .map(|m| !m.is_empty())
+                    .unwrap_or(false);
+
+                if has_memory_dir || has_overrides {
+                    let mut settings = serde_json::Map::new();
+                    if let Some(ref dir) = options.auto_memory_directory {
+                        if !dir.is_empty() {
+                            settings.insert(
+                                "autoMemoryDirectory".to_string(),
+                                serde_json::Value::String(dir.clone()),
+                            );
+                        }
+                    }
+                    if let Some(ref overrides) = options.model_overrides {
+                        if !overrides.is_empty() {
+                            if let Ok(val) = serde_json::to_value(overrides) {
+                                settings.insert("modelOverrides".to_string(), val);
+                            }
+                        }
+                    }
+                    if let Ok(settings_json) = serde_json::to_string(&settings) {
+                        let escaped = settings_json.replace('\'', "'\\''");
+                        claude_cmd.push_str(&format!(" --settings '{}'", escaped));
+                    }
                 }
             }
 
@@ -3075,4 +3130,65 @@ mod tests {
         let dir = "";
         assert!(dir.is_empty(), "Empty directory should be skipped");
     }
+
+    /// Build the combined settings JSON for both memory directory and model overrides (for testing)
+    #[cfg(test)]
+    fn build_combined_settings_arg(
+        memory_dir: Option<&str>,
+        model_overrides: Option<&std::collections::HashMap<String, String>>,
+    ) -> String {
+        let mut settings = serde_json::Map::new();
+        if let Some(dir) = memory_dir {
+            if !dir.is_empty() {
+                settings.insert(
+                    "autoMemoryDirectory".to_string(),
+                    serde_json::Value::String(dir.to_string()),
+                );
+            }
+        }
+        if let Some(overrides) = model_overrides {
+            if !overrides.is_empty() {
+                if let Ok(val) = serde_json::to_value(overrides) {
+                    settings.insert("modelOverrides".to_string(), val);
+                }
+            }
+        }
+        serde_json::to_string(&settings).unwrap_or_default()
+    }
+
+    #[test]
+    fn test_e2e_combined_settings_memory_only() {
+        let result = build_combined_settings_arg(Some("/custom/dir"), None);
+        assert_eq!(result, r#"{"autoMemoryDirectory":"/custom/dir"}"#);
+    }
+
+    #[test]
+    fn test_e2e_combined_settings_overrides_only() {
+        let mut overrides = std::collections::HashMap::new();
+        overrides.insert(
+            "claude-opus-4-6".to_string(),
+            "arn:aws:bedrock:us-east-1::foundation-model/anthropic.claude-opus-4-6-v1".to_string(),
+        );
+        let result = build_combined_settings_arg(None, Some(&overrides));
+        assert!(result.contains("modelOverrides"));
+        assert!(result.contains("claude-opus-4-6"));
+        assert!(result.contains("arn:aws:bedrock"));
+    }
+
+    #[test]
+    fn test_e2e_combined_settings_both_fields() {
+        let mut overrides = std::collections::HashMap::new();
+        overrides.insert("claude-opus-4-6".to_string(), "custom-model-id".to_string());
+        let result = build_combined_settings_arg(Some("/mem/dir"), Some(&overrides));
+        assert!(result.contains("autoMemoryDirectory"));
+        assert!(result.contains("modelOverrides"));
+        assert!(result.contains("/mem/dir"));
+        assert!(result.contains("custom-model-id"));
+    }
+
+    #[test]
+    fn test_e2e_combined_settings_empty_produces_empty_object() {
+        let result = build_combined_settings_arg(Some(""), None);
+        assert_eq!(result, "{}");
+    }
 }

src/lib/commands/slashCommands.test.ts

@@ -68,6 +68,7 @@ vi.mock("$lib/stores/config", () => ({
       include_git_instructions: true,
       enable_claudeai_mcp_servers: true,
       auto_memory_directory: null,
+      model_overrides: null,
     }),
   },
 }));

src/lib/commands/slashCommands.ts

@@ -69,6 +69,7 @@ async function changeDirectory(path: string): Promise<void> {
         include_git_instructions: config.include_git_instructions ?? true,
         enable_claudeai_mcp_servers: config.enable_claudeai_mcp_servers ?? true,
         auto_memory_directory: config.auto_memory_directory || null,
+        model_overrides: config.model_overrides || null,
       },
     });
 
@@ -149,6 +150,7 @@ async function startNewConversation(): Promise<void> {
         include_git_instructions: config.include_git_instructions ?? true,
         enable_claudeai_mcp_servers: config.enable_claudeai_mcp_servers ?? true,
         auto_memory_directory: config.auto_memory_directory || null,
+        model_overrides: config.model_overrides || null,
       },
     });
 

src/lib/components/ConfigSidebar.svelte

@@ -62,6 +62,7 @@
     include_git_instructions: true,
     enable_claudeai_mcp_servers: true,
     auto_memory_directory: null,
+    model_overrides: null,
     max_output_tokens: null,
     trusted_workspaces: [],
     background_image_path: null,
@@ -82,6 +83,8 @@
   let customUiFontPathInput = $state("");
   let customUiFontFamilyInput = $state("");
   let customUiFontStatus: string | null = $state(null);
+  let modelOverridesJson = $state("");
+  let modelOverridesError: string | null = $state(null);
 
   interface AuthStatus {
     is_logged_in: boolean;
@@ -111,6 +114,7 @@
     customFontFamilyInput = c.custom_font_family ?? "";
     customUiFontPathInput = c.custom_ui_font_path ?? "";
     customUiFontFamilyInput = c.custom_ui_font_family ?? "";
+    modelOverridesJson = c.model_overrides ? JSON.stringify(c.model_overrides, null, 2) : "";
   });
 
   configStore.isSidebarOpen.subscribe((open) => {
@@ -196,6 +200,18 @@
   async function handleSave() {
     isSaving = true;
     saveError = null;
+    modelOverridesError = null;
+    try {
+      if (modelOverridesJson.trim()) {
+        config.model_overrides = JSON.parse(modelOverridesJson) as Record<string, string>;
+      } else {
+        config.model_overrides = null;
+      }
+    } catch {
+      modelOverridesError = "Invalid JSON — please check your model overrides.";
+      isSaving = false;
+      return;
+    }
     try {
       await configStore.saveConfig(config);
       configStore.closeSidebar();
@@ -622,6 +638,28 @@
           default (working directory).
         </p>
       </div>
+
+      <!-- Model Overrides -->
+      <div class="mb-4">
+        <label for="model-overrides" class="block text-sm text-[var(--text-primary)] mb-1">
+          Model overrides <span class="text-[var(--text-tertiary)]">(optional)</span>
+        </label>
+        <textarea
+          id="model-overrides"
+          rows={4}
+          placeholder={'{\n  "claude-opus-4-6": "arn:aws:bedrock:..."\n}'}
+          bind:value={modelOverridesJson}
+          class="w-full px-3 py-2 text-sm bg-[var(--bg-primary)] border border-[var(--border-color)] rounded text-[var(--text-primary)] placeholder-[var(--text-tertiary)] focus:outline-none focus:border-[var(--accent-primary)] font-mono resize-y"
+        ></textarea>
+        {#if modelOverridesError}
+          <p class="text-xs text-red-500 mt-1">{modelOverridesError}</p>
+        {/if}
+        <p class="text-xs text-[var(--text-tertiary)] mt-1">
+          JSON map of model names to provider-specific IDs (for AWS Bedrock, Google Vertex, etc.).
+          Passed via <code class="font-mono">--settings modelOverrides</code>. Leave blank to use
+          defaults.
+        </p>
+      </div>
     </section>
 
     <!-- Greeting Section -->

src/lib/components/InputBar.svelte

@@ -405,6 +405,7 @@ User: ${formattedMessage}`;
               include_git_instructions: config.include_git_instructions ?? true,
               enable_claudeai_mcp_servers: config.enable_claudeai_mcp_servers ?? true,
               auto_memory_directory: config.auto_memory_directory || null,
+              model_overrides: config.model_overrides || null,
             },
           });
 

src/lib/components/PermissionModal.svelte

@@ -92,6 +92,7 @@
           include_git_instructions: config.include_git_instructions ?? true,
           enable_claudeai_mcp_servers: config.enable_claudeai_mcp_servers ?? true,
           auto_memory_directory: config.auto_memory_directory || null,
+          model_overrides: config.model_overrides || null,
         },
       });
 

src/lib/components/StatusBar.svelte

@@ -92,6 +92,7 @@
     include_git_instructions: true,
     enable_claudeai_mcp_servers: true,
     auto_memory_directory: null,
+    model_overrides: null,
   });
 
   let streamerModeActive = $state(false);
@@ -175,6 +176,7 @@
           include_git_instructions: currentConfig.include_git_instructions ?? true,
           enable_claudeai_mcp_servers: currentConfig.enable_claudeai_mcp_servers ?? true,
           auto_memory_directory: currentConfig.auto_memory_directory || null,
+          model_overrides: currentConfig.model_overrides || null,
         },
       });
 
@@ -335,6 +337,7 @@
           include_git_instructions: currentConfig.include_git_instructions ?? true,
           enable_claudeai_mcp_servers: currentConfig.enable_claudeai_mcp_servers ?? true,
           auto_memory_directory: currentConfig.auto_memory_directory || null,
+          model_overrides: currentConfig.model_overrides || null,
         },
       });
 

src/lib/components/TaskLoopPanel.svelte

@@ -221,6 +221,7 @@
           include_git_instructions: cfg.include_git_instructions ?? true,
           enable_claudeai_mcp_servers: cfg.enable_claudeai_mcp_servers ?? true,
           auto_memory_directory: cfg.auto_memory_directory || null,
+          model_overrides: cfg.model_overrides || null,
         },
       });
     } catch (error) {

src/lib/components/UserQuestionModal.svelte

@@ -111,6 +111,7 @@
           include_git_instructions: config.include_git_instructions ?? true,
           enable_claudeai_mcp_servers: config.enable_claudeai_mcp_servers ?? true,
           auto_memory_directory: config.auto_memory_directory || null,
+          model_overrides: config.model_overrides || null,
         },
       });
 

src/lib/stores/config.test.ts

@@ -224,6 +224,7 @@ describe("config store", () => {
         include_git_instructions: true,
         enable_claudeai_mcp_servers: true,
         auto_memory_directory: null,
+        model_overrides: null,
       };
 
       expect(config.model).toBe("claude-sonnet-4");
@@ -287,6 +288,7 @@ describe("config store", () => {
         include_git_instructions: true,
         enable_claudeai_mcp_servers: true,
         auto_memory_directory: null,
+        model_overrides: null,
       };
 
       expect(config.model).toBeNull();
@@ -905,6 +907,7 @@ describe("config store", () => {
         include_git_instructions: true,
         enable_claudeai_mcp_servers: true,
         auto_memory_directory: null,
+        model_overrides: null,
       };
 
       const mockInvokeImpl = vi.mocked(invoke);

src/lib/stores/config.ts

@@ -89,6 +89,8 @@ export interface HikariConfig {
   enable_claudeai_mcp_servers: boolean;
   // Auto-memory directory
   auto_memory_directory: string | null;
+  // Model overrides for provider-specific model IDs (AWS Bedrock, Google Vertex, etc.)
+  model_overrides: Record<string, string> | null;
 }
 
 const defaultConfig: HikariConfig = {
@@ -146,6 +148,7 @@ const defaultConfig: HikariConfig = {
   include_git_instructions: true,
   enable_claudeai_mcp_servers: true,
   auto_memory_directory: null,
+  model_overrides: null,
 };
 
 function createConfigStore() {

vitest.setup.ts

@@ -50,6 +50,7 @@ vi.mock("@tauri-apps/api/core", () => ({
           profile_bio: null,
           custom_theme_colors: {},
           auto_memory_directory: null,
+          model_overrides: null,
         });
       case "list_quick_actions":
         return Promise.resolve([]);