fix(question-tool): stop silent skips when tool looks unavailable (#620)

plugins/compound-engineering/skills/ce-brainstorm/SKILL.md

@@ -30,7 +30,7 @@ This skill does not implement code. It explores, clarifies, and documents decisi
 1. **Ask one question at a time** - Do not batch several unrelated questions into one message.
 2. **Prefer single-select multiple choice** - Use single-select when choosing one direction, one priority, or one next step.
 3. **Use multi-select rarely and intentionally** - Use it only for compatible sets such as goals, constraints, non-goals, or success criteria that can all coexist. If prioritization matters, follow up by asking which selected item is primary.
-4. **Use the platform's question tool when available** - When asking the user a question, prefer the platform's blocking question tool if one exists (`AskUserQuestion` in Claude Code, `request_user_input` in Codex, `ask_user` in Gemini). Otherwise, present numbered options in chat and wait for the user's reply before proceeding.
+4. **Use the platform's blocking question tool** - `AskUserQuestion` in Claude Code (call `ToolSearch` with `select:AskUserQuestion` first if its schema isn't loaded), `request_user_input` in Codex, `ask_user` in Gemini. Fall back to numbered options in chat only when no blocking tool exists in the harness or the call errors (e.g., Codex edit modes) — not because a schema load is required. Never silently skip the question.
 
 ## Output Guidance
 

plugins/compound-engineering/skills/ce-brainstorm/references/handoff.md

@@ -6,7 +6,7 @@ This content is loaded when Phase 4 begins — after the requirements document i
 
 #### 4.1 Present Next-Step Options
 
-Present the options using the platform's blocking question tool (`AskUserQuestion` in Claude Code, `request_user_input` in Codex, `ask_user` in Gemini). If no question tool is available, present the numbered options in chat and wait for the user's reply before proceeding.
+Present the options using the platform's blocking question tool: `AskUserQuestion` in Claude Code (call `ToolSearch` with `select:AskUserQuestion` first if its schema isn't loaded), `request_user_input` in Codex, `ask_user` in Gemini. Fall back to numbered options in chat only when no blocking tool exists in the harness or the call errors (e.g., Codex edit modes) — not because a schema load is required. Never silently skip the question.
 
 If `Resolve Before Planning` contains any items:
 - Ask the blocking questions now, one at a time, by default

plugins/compound-engineering/skills/ce-brainstorm/references/universal-brainstorming.md

@@ -45,7 +45,7 @@ When the conversation has enough material to narrow — reflect back what you've
 
 **Always synthesize a summary in the chat.** Before offering any next steps, reflect back what emerged: key decisions, the direction chosen, open threads, and any assumptions made. This is the primary output of the brainstorm — the user should be able to read the summary and know what they landed on.
 
-**Then offer next steps** using the platform's question tool (`AskUserQuestion` in Claude Code, `request_user_input` in Codex, `ask_user` in Gemini). If no question tool is available, present the numbered options in chat and wait for the user's reply before proceeding.
+**Then offer next steps** using the platform's blocking question tool: `AskUserQuestion` in Claude Code (call `ToolSearch` with `select:AskUserQuestion` first if its schema isn't loaded), `request_user_input` in Codex, `ask_user` in Gemini. Fall back to numbered options in chat only when no blocking tool exists in the harness or the call errors (e.g., Codex edit modes) — not because a schema load is required. Never silently skip the question.
 
 **Question:** "Brainstorm wrapped. What would you like to do next?"