feat: add ENABLE_CLAUDEAI_MCP_SERVERS opt-out setting

Adds a toggle in the MCP Servers settings section to control whether
Claude Code connects to MCP servers configured in Claude.ai. When
disabled, sets ENABLE_CLAUDEAI_MCP_SERVERS=false. Also fixes a
pre-existing omission of disable_cron from the TypeScript HikariConfig
interface.

Closes #210

src-tauri/src/config.rs

@@ -40,6 +40,9 @@ pub struct ClaudeStartOptions {
 
     #[serde(default = "default_include_git_instructions")]
     pub include_git_instructions: bool,
+
+    #[serde(default = "default_enable_claudeai_mcp_servers")]
+    pub enable_claudeai_mcp_servers: bool,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -180,6 +183,9 @@ pub struct HikariConfig {
 
     #[serde(default = "default_include_git_instructions")]
     pub include_git_instructions: bool,
+
+    #[serde(default = "default_enable_claudeai_mcp_servers")]
+    pub enable_claudeai_mcp_servers: bool,
 }
 
 impl Default for HikariConfig {
@@ -228,6 +234,7 @@ impl Default for HikariConfig {
             task_loop_include_summary: false,
             disable_cron: false,
             include_git_instructions: true,
+            enable_claudeai_mcp_servers: true,
         }
     }
 }
@@ -276,6 +283,10 @@ fn default_include_git_instructions() -> bool {
     true
 }
 
+fn default_enable_claudeai_mcp_servers() -> bool {
+    true
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize, Default, PartialEq)]
 #[serde(rename_all = "lowercase")]
 pub enum BudgetAction {
@@ -372,6 +383,7 @@ mod tests {
         assert!(!config.task_loop_include_summary);
         assert!(!config.disable_cron);
         assert!(config.include_git_instructions);
+        assert!(config.enable_claudeai_mcp_servers);
     }
 
     #[test]
@@ -420,6 +432,7 @@ mod tests {
             task_loop_include_summary: true,
             disable_cron: true,
             include_git_instructions: false,
+            enable_claudeai_mcp_servers: false,
         };
 
         let json = serde_json::to_string(&config).unwrap();
@@ -439,6 +452,7 @@ mod tests {
         assert!(deserialized.task_loop_include_summary);
         assert!(deserialized.disable_cron);
         assert!(!deserialized.include_git_instructions);
+        assert!(!deserialized.enable_claudeai_mcp_servers);
     }
 
     #[test]

src-tauri/src/wsl_bridge.rs

@@ -320,6 +320,11 @@ impl WslBridge {
                 cmd.env("CLAUDE_CODE_DISABLE_GIT_INSTRUCTIONS", "1");
             }
 
+            // Opt out of claude.ai MCP servers if requested
+            if !options.enable_claudeai_mcp_servers {
+                cmd.env("ENABLE_CLAUDEAI_MCP_SERVERS", "false");
+            }
+
             cmd
         } else {
             // Running on Windows - use wsl with bash login shell to ensure PATH is loaded
@@ -382,6 +387,11 @@ impl WslBridge {
                 claude_cmd.push_str("CLAUDE_CODE_DISABLE_GIT_INSTRUCTIONS=1 ");
             }
 
+            // Opt out of claude.ai MCP servers if requested
+            if !options.enable_claudeai_mcp_servers {
+                claude_cmd.push_str("ENABLE_CLAUDEAI_MCP_SERVERS=false ");
+            }
+
             claude_cmd.push_str(
                 "claude --output-format stream-json --input-format stream-json --verbose",
             );

src/lib/commands/slashCommands.test.ts

@@ -66,6 +66,7 @@ vi.mock("$lib/stores/config", () => ({
       disable_1m_context: false,
       max_output_tokens: null,
       include_git_instructions: true,
+      enable_claudeai_mcp_servers: true,
     }),
   },
 }));

src/lib/commands/slashCommands.ts

@@ -67,6 +67,7 @@ async function changeDirectory(path: string): Promise<void> {
         disable_1m_context: config.disable_1m_context ?? false,
         max_output_tokens: config.max_output_tokens ?? null,
         include_git_instructions: config.include_git_instructions ?? true,
+        enable_claudeai_mcp_servers: config.enable_claudeai_mcp_servers ?? true,
       },
     });
 
@@ -145,6 +146,7 @@ async function startNewConversation(): Promise<void> {
         disable_1m_context: config.disable_1m_context ?? false,
         max_output_tokens: config.max_output_tokens ?? null,
         include_git_instructions: config.include_git_instructions ?? true,
+        enable_claudeai_mcp_servers: config.enable_claudeai_mcp_servers ?? true,
       },
     });
 

src/lib/components/ConfigSidebar.svelte

@@ -60,6 +60,7 @@
     disable_1m_context: false,
     disable_cron: false,
     include_git_instructions: true,
+    enable_claudeai_mcp_servers: true,
     max_output_tokens: null,
     trusted_workspaces: [],
     background_image_path: null,
@@ -562,8 +563,8 @@
           <span class="text-sm text-[var(--text-primary)]">Disable cron scheduling</span>
         </label>
         <p class="text-xs text-[var(--text-tertiary)] mt-1 ml-7">
-          Sets <code class="font-mono">CLAUDE_CODE_DISABLE_CRON=1</code> to prevent Claude from
-          scheduling recurring tasks
+          Sets <code class="font-mono">CLAUDE_CODE_DISABLE_CRON=1</code> to prevent Claude from scheduling
+          recurring tasks
         </p>
       </div>
 
@@ -658,6 +659,22 @@
           class="w-full px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-color)] rounded-lg text-[var(--text-primary)] font-mono text-sm focus:outline-none focus:border-[var(--accent-primary)] resize-none"
         ></textarea>
       </div>
+
+      <!-- Enable Claude.ai MCP Servers -->
+      <div class="mb-4">
+        <label class="flex items-center gap-3 cursor-pointer">
+          <input
+            type="checkbox"
+            bind:checked={config.enable_claudeai_mcp_servers}
+            class="w-4 h-4 rounded border-[var(--border-color)] bg-[var(--bg-primary)] text-[var(--accent-primary)] focus:ring-[var(--accent-primary)]"
+          />
+          <span class="text-sm text-[var(--text-primary)]">Enable Claude.ai MCP servers</span>
+        </label>
+        <p class="text-xs text-[var(--text-tertiary)] mt-1 ml-7">
+          When disabled, sets <code class="font-mono">ENABLE_CLAUDEAI_MCP_SERVERS=false</code> to prevent
+          Claude Code from connecting to MCP servers configured in Claude.ai.
+        </p>
+      </div>
     </section>
 
     <!-- Auto-Granted Tools Section -->

src/lib/components/InputBar.svelte

@@ -403,6 +403,7 @@ User: ${formattedMessage}`;
               use_worktree: config.use_worktree ?? false,
               disable_1m_context: config.disable_1m_context ?? false,
               include_git_instructions: config.include_git_instructions ?? true,
+              enable_claudeai_mcp_servers: config.enable_claudeai_mcp_servers ?? true,
             },
           });
 

src/lib/components/PermissionModal.svelte

@@ -90,6 +90,7 @@
           use_worktree: config.use_worktree ?? false,
           disable_1m_context: config.disable_1m_context ?? false,
           include_git_instructions: config.include_git_instructions ?? true,
+          enable_claudeai_mcp_servers: config.enable_claudeai_mcp_servers ?? true,
         },
       });
 

src/lib/components/StatusBar.svelte

@@ -88,6 +88,9 @@
     task_loop_auto_commit: false,
     task_loop_commit_prefix: "feat",
     task_loop_include_summary: false,
+    disable_cron: false,
+    include_git_instructions: true,
+    enable_claudeai_mcp_servers: true,
   });
 
   let streamerModeActive = $state(false);
@@ -169,6 +172,7 @@
           disable_1m_context: currentConfig.disable_1m_context ?? false,
           max_output_tokens: currentConfig.max_output_tokens ?? null,
           include_git_instructions: currentConfig.include_git_instructions ?? true,
+          enable_claudeai_mcp_servers: currentConfig.enable_claudeai_mcp_servers ?? true,
         },
       });
 
@@ -327,6 +331,7 @@
           disable_1m_context: currentConfig.disable_1m_context ?? false,
           max_output_tokens: currentConfig.max_output_tokens ?? null,
           include_git_instructions: currentConfig.include_git_instructions ?? true,
+          enable_claudeai_mcp_servers: currentConfig.enable_claudeai_mcp_servers ?? true,
         },
       });
 
@@ -405,8 +410,12 @@
           title="Worktree: {worktreeInfo.name} | Base: {worktreeInfo.original_repo_directory}"
         >
           <svg class="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
-              d="M13 10V3L4 14h7v7l9-11h-7z" />
+            <path
+              stroke-linecap="round"
+              stroke-linejoin="round"
+              stroke-width="2"
+              d="M13 10V3L4 14h7v7l9-11h-7z"
+            />
           </svg>
           {worktreeInfo.branch}
         </div>

src/lib/components/TaskLoopPanel.svelte

@@ -219,6 +219,7 @@
           disable_1m_context: cfg.disable_1m_context ?? false,
           max_output_tokens: cfg.max_output_tokens ?? null,
           include_git_instructions: cfg.include_git_instructions ?? true,
+          enable_claudeai_mcp_servers: cfg.enable_claudeai_mcp_servers ?? true,
         },
       });
     } catch (error) {

src/lib/components/UserQuestionModal.svelte

@@ -109,6 +109,7 @@
           use_worktree: config.use_worktree ?? false,
           disable_1m_context: config.disable_1m_context ?? false,
           include_git_instructions: config.include_git_instructions ?? true,
+          enable_claudeai_mcp_servers: config.enable_claudeai_mcp_servers ?? true,
         },
       });
 

src/lib/stores/config.test.ts

@@ -220,7 +220,9 @@ describe("config store", () => {
         task_loop_auto_commit: false,
         task_loop_commit_prefix: "feat",
         task_loop_include_summary: false,
+        disable_cron: false,
         include_git_instructions: true,
+        enable_claudeai_mcp_servers: true,
       };
 
       expect(config.model).toBe("claude-sonnet-4");
@@ -280,7 +282,9 @@ describe("config store", () => {
         task_loop_auto_commit: false,
         task_loop_commit_prefix: "feat",
         task_loop_include_summary: false,
+        disable_cron: false,
         include_git_instructions: true,
+        enable_claudeai_mcp_servers: true,
       };
 
       expect(config.model).toBeNull();
@@ -895,7 +899,9 @@ describe("config store", () => {
         task_loop_auto_commit: false,
         task_loop_commit_prefix: "feat",
         task_loop_include_summary: false,
+        disable_cron: false,
         include_git_instructions: true,
+        enable_claudeai_mcp_servers: true,
       };
 
       const mockInvokeImpl = vi.mocked(invoke);

src/lib/stores/config.ts

@@ -81,8 +81,12 @@ export interface HikariConfig {
   task_loop_auto_commit: boolean;
   task_loop_commit_prefix: string;
   task_loop_include_summary: boolean;
+  // Disable cron scheduling
+  disable_cron: boolean;
   // Git instructions setting
   include_git_instructions: boolean;
+  // Claude.ai MCP servers setting
+  enable_claudeai_mcp_servers: boolean;
 }
 
 const defaultConfig: HikariConfig = {
@@ -136,7 +140,9 @@ const defaultConfig: HikariConfig = {
   task_loop_auto_commit: false,
   task_loop_commit_prefix: "feat",
   task_loop_include_summary: false,
+  disable_cron: false,
   include_git_instructions: true,
+  enable_claudeai_mcp_servers: true,
 };
 
 function createConfigStore() {