[FEATURE] Inline option selection with feedback in Plan Mode

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When Claude Code presents a list of options in Plan Mode (e.g., "How would you like to handle X? Option 1... Option 2... Option 3..."), the current interaction model is binary: either pick an option as-is, or type a free-form message overriding everything. There's no way to say "Option 1, but with this modification" without re-explaining the full intent from scratch.

Proposed Solution

Allow users to select an option and attach inline feedback or edits to that specific selection — similar to choosing a radio button and then getting a follow-up text field to qualify it.

Concretely, the flow would look like:

1. Claude presents options in Plan Mode
2. User selects one (e.g., Option 1)
3. A follow-up input appears, pre-anchored to that option — something like: "Any modifications to Option 1?"
4. User can leave it blank (pure selection) or type a qualifier (e.g., "but skip the database migration step")
5. Claude proceeds with Option 1 as the base, incorporating the feedback

Why This Matters

In practice, none of the options Claude offers are ever a perfect fit. The current workaround is to type a custom response like "go with the first option but..." — which forces the user to re-describe the option they already selected, and breaks the structured selection flow entirely. This feature would make plan-mode interactions feel more like a real back-and-forth and less like filling out a form with no margin for nuance.

Acceptance Criteria

• When an option is selected in Plan Mode, an optional follow-up input is available before confirming
• Leaving the input blank behaves identically to the current selection behavior
• Claude's plan summary reflects both the chosen option and the user's qualifier

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

Interactive mode (TUI)

Use Case Example

Example scenario:

1. I ask Claude to help refactor an authentication module
2. Claude enters Plan Mode and presents 3 approaches (JWT, session-based, OAuth)
3. I want JWT, but with refresh token support added
4. Currently I have to type "go with option 1 but also add refresh token handling" from scratch
5. With this feature, I'd select Option 1 and type "add refresh token support" in the follow-up field
6. Claude proceeds with JWT as the base, already aware of the qualifier — no re-explanation needed

Additional Context

_No response_