Mid-session prompt suggestions populate input buffer and submit on Enter

Bug: Mid-session prompt suggestions populate input buffer and submit on Enter

Version

Claude Code v2.1.126, Windows 11 Pro, PowerShell, Claude Pro (Opus 4.6)

Summary

During an active session, context-aware text appears in the input prompt that the user did not type. Unlike the startup placeholder hints (e.g. try "create a util logging.py that..."), these mid-session suggestions populate the actual input buffer and can be submitted by pressing Enter.

Steps to reproduce

1. Start a Claude Code session and work on a multi-step task (editing files, pushing to git, etc.)
2. After Claude completes a response, observe the input prompt
3. Context-aware suggestion text appears in the prompt without any user input
4. Pressing Enter submits the suggestion as if the user typed it

Observed behaviour

Startup hint (harmless)

• Grey placeholder text like try "create a util logging.py that..." appears on fresh launch
• Pressing Enter does not submit this text — it behaves as placeholder/ghost text
• Disappears when user starts typing

Mid-session suggestions (dangerous)

• After completing a git push, the prompt populated with: "check the deploy"
• After editing a landing page layout, the prompt populated with: "can we cut the topic lanes, they're not adding much"
• These are context-aware — they reference the current task, not generic suggestions
• Pressing Enter does submit this text as a real user message
• The user did not type any of this text

Expected behaviour

The input prompt should never contain submittable text that the user did not type. Suggestions should either:

• Be clearly distinguished as non-submittable placeholder text (like the startup hints), or
• Not appear at all without explicit opt-in

Risk

This is a safety issue. An unsolicited, context-aware suggestion that submits on Enter could:

• Trigger unwanted file edits or deletions
• Execute git operations (push, reset, etc.)
• Run destructive shell commands
• Make changes the user didn't intend or review

The user may not notice the prompt has been pre-filled, especially during fast-paced work sessions.

Screenshots

Available on request — two separate instances captured during a single session.

Environment

• Claude Code v2.1.126
• Windows 11 Pro 10.0.26200
• PowerShell
• Opus 4.6 with high effort
• Claude Pro subscription
• Custom launcher (CLAW) — confirmed not the source, it does not interact with stdin
• PSReadLine PredictionSource: blank/none — confirmed not the source