Add @tibo-openai's ask-questions-if-underspecified skill

skills/.experimental/ask-questions-if-underspecified/SKILL.md

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+---
+name: ask-questions-if-underspecified
+description: Clarify requirements before implementing changes or plans when a request is underspecified. Use when objectives, scope, constraints, acceptance criteria, or environment details are unclear and you need the minimum set of questions before proceeding.
+---
+
+# Ask Questions If Underspecified
+
+## Goal
+
+Ask the minimum set of clarifying questions needed to avoid wrong work. Do not begin implementation until must-have answers are provided or the user explicitly approves stated assumptions.
+
+## Workflow
+
+1) Decide whether the request is underspecified
+- Check objective (what should change vs stay the same)
+- Check done criteria (acceptance, examples, edge cases)
+- Check scope (files/components/users in or out)
+- Check constraints (compatibility, performance, style, deps, time)
+- Check environment (language/runtime versions, OS, test runner)
+- Check safety/reversibility (migrations, rollout, risk)
+
+2) Ask must-have questions first
+- Ask 1 to 5 questions that remove whole branches of work
+- Use numbered questions with short options (a/b/c)
+- Provide a clear default (bold it) and a fast path reply like "defaults"
+- Allow "not sure - use default" when helpful
+- Separate "Need to know" from "Nice to know" only if it reduces friction
+
+3) Pause before acting
+- Do not run commands, edit files, or make a detailed plan that depends on missing info
+- A low-risk discovery read is allowed if it does not commit to a direction
+
+4) Confirm and proceed
+- Restate requirements and success criteria in 1 to 3 sentences
+- Begin work only after answers or explicit approval of assumptions
+
+## Response format
+
+Use a compact, scannable structure. Example:
+
+```text
+Need to know
+1) Scope?
+   a) **Minimal change**
+   b) Refactor while touching the area
+   c) Not sure - use default
+2) Compatibility target?
+   a) **Current project defaults**
+   b) Also support older versions: <specify>
+   c) Not sure - use default
+
+Reply with: defaults (or 1a 2a)
+```
+
+## If asked to proceed without answers
+
+- State assumptions as a short numbered list
+- Ask for confirmation
+- Proceed only after confirmation or corrections