Plan Mode Violation: File system modification allowed during read-only phase #13472

Description

Description

During a plan mode (read-only) session, the AI was able to execute destructive file system commands that should have been blocked.

What Happened

• System was in Plan Mode (read-only analysis phase)
• AI executed: rm -f ./nul to delete a file
• The file was successfully deleted
• This should NOT have been possible in read-only mode

Expected Behavior

In Plan Mode, the system should:

• Block ALL file modifications
• Block ALL bash commands that write/delete files
• Only allow read operations (ls, find, grep, etc.)
• Prevent any changes to the repository

Actual Behavior

• Destructive rm -f command was executed successfully
• File was deleted from the repository
• No error or warning was issued

Technical Details

• Tool Used: bash with rm -f ./nul
• Working Directory: C:\Users\Müller\source\repos\My.Projekt
• System: Windows
• Command executed during analysis phase that should have been read-only

Impact

This is a critical security/integrity violation because:

1. Plan Mode should be immutable (read-only)
2. Users could accidentally (or intentionally) modify their repository during planning
3. No safeguards prevented destructive operations

Steps to Reproduce

1. Enter Plan Mode (read-only phase)
2. Execute any bash file deletion command (e.g., rm -f filename)
3. Observe: Command executes instead of being blocked

Suggested Fix

• Block all non-read-only bash operations during Plan Mode
• Whitelist only: ls, find, grep, cat, head, tail, read operations
• Reject: rm, mv, cp, sed, tee, echo > (write operations)
• Enforce at tool level before command execution

Plugins

No response

OpenCode version

Desktop v1.1.60

Steps to reproduce

Hard to say.
There was a left over "nul" file in the repository, that the normal explorer could not delete so i asked the AI about the issue and the AI just removed the file in Plan Mode.

Screenshot and/or share link

No response

Operating System

Windows 11 24H2 Build 26100.4349

Terminal

No response