[BUG] "Don't ask again for cd:*" silently fails — lowercase tool name rejected by settings schema

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When a Bash command starts with cd (e.g. cd /path && git commit ...), Claude Code prompts:

❯ 1. Yes
  2. Yes, and don't ask again for: cd:*
  3. No

Selecting option 2 does not persist the permission. The prompt reappears on every subsequent cd command, indefinitely.

Root cause: The permission string cd:* generated by the UI starts with a lowercase letter. The settings schema validation requires tool names to start with uppercase:

permissions.allow.1: Tool names must start with uppercase. Use "Cd:*"

Since cd:* fails validation, the write to settings.json is silently rejected and the permission never saves. The user has no indication that anything went wrong.

What Should Happen?

Either:

1. The UI should generate the correctly-cased permission string (e.g. Bash(cd:*) which passes validation), or
2. The schema should accept lowercase command prefixes for Bash sub-command patterns like cd:*, or
3. At minimum, the user should see an error message when the save fails

Steps to Reproduce

1. Run any compound command starting with cd, e.g. cd /c/Users/me/project && git status
2. When prompted, select **"Yes, and don't ask again for: cd:"*
3. Run another command starting with cd
4. Permission prompt appears again (it was never saved)
5. Check ~/.claude/settings.json — no cd:* entry was added

Workaround

Manually add the correctly-cased entry to ~/.claude/settings.json:

{
  "permissions": {
    "allow": [
      "Bash(cd:*)"
    ]
  }
}

Error Messages/Logs

The validation error (only visible when attempting to write cd:* programmatically):

Settings validation failed:
- permissions.allow.1: Tool names must start with uppercase. Use "Cd:*"

Claude Model

Claude Opus 4.6

Is this a regression?

I don't know

Claude Code Version

Latest (auto-updates channel)

Platform

Anthropic API (Claude Pro)

Operating System

Windows 11 Pro

Terminal/Shell

Git Bash (MSYS2)

Additional Information

This is distinct from:

• #5710 / #27902 (permissions array overwrite bug)
• #28036 / #27407 (wrong command suggested in piped chains)
• #21080 / #24381 (general persistence issues)

Those bugs are about what gets saved or how it gets saved. This bug is about the save silently failing validation due to casing.