🤖 fix: hide ask_user_question from exec mode tool list

Add optional mode parameter to getAvailableTools so ask_user_question
is only advertised in plan mode, matching the runtime registration.

Fixes P1 review feedback: models would otherwise invoke unavailable
tool in exec mode and cause failures.

Signed-off-by: Thomas Kosiewski <tk@coder.com>

---
_Generated with `mux`_

Change-Id: I1e2c792bee3b0606ec0c10a18a19443d990f2091

Author: ThomasK33

src/common/utils/tools/toolDefinitions.ts

@@ -401,9 +401,10 @@ export function getToolSchemas(): Record<string, ToolSchema> {
 /**
  * Get which tools are available for a given model
  * @param modelString The model string (e.g., "anthropic:claude-opus-4-1")
+ * @param mode Optional mode ("plan" | "exec") - ask_user_question only available in plan mode
  * @returns Array of tool names available for the model
  */
-export function getAvailableTools(modelString: string): string[] {
+export function getAvailableTools(modelString: string, mode?: "plan" | "exec"): string[] {
   const [provider] = modelString.split(":");
 
   // Base tools available for all models
@@ -416,7 +417,8 @@ export function getAvailableTools(modelString: string): string[] {
     "file_edit_replace_string",
     // "file_edit_replace_lines", // DISABLED: causes models to break repo state
     "file_edit_insert",
-    "ask_user_question",
+    // ask_user_question only available in plan mode
+    ...(mode === "plan" ? ["ask_user_question"] : []),
     "propose_plan",
     "todo_write",
     "todo_read",