[Bug] @ fuzzy search not finding files in workspace-configured repositories

Bug Description

Bug Report: @ mentions missing files from additionalDirectories

Summary

@ file mentions do not include files from additionalDirectories in autocomplete suggestions.

Environment

• Claude Code CLI
• Multi-folder workspace with additionalDirectories configured

Workspace Structure

~/projects/
├── main-workspace/                    # CWD where Claude Code is launched
│   ├── .claude/
│   │   └── settings.local.json        # Contains additionalDirectories config
│   ├── main-workspace.code-workspace  # VS Code multi-root workspace file
│   ├── CLAUDE.md
│   ├── src/
│   │   └── ...
│   └── package.json
│
├── project-a/                         # Additional directory #1
│   ├── src/
│   │   └── main.py
│   └── pyproject.toml
│
├── project-b/                         # Additional directory #2
│   ├── api/
│   │   └── main.py
│   └── pyproject.toml
│
├── project-c/                         # Additional directory #3
│   ├── src/
│   │   └── types.ts
│   └── package.json
│
└── project-d/                         # Additional directory #4
    └── docs/
        └── README.md

Configuration Files

.claude/settings.local.json

{
  "permissions": {
    "allow": [...],
    "deny": [...],
    "additionalDirectories": [
      "/home/user/projects/project-a",
      "/home/user/projects/project-b",
      "/home/user/projects/project-c",
      "/home/user/projects/project-d"
    ]
  }
}

Steps to Reproduce

1. Create a main workspace directory with .claude/settings.local.json
2. Configure permissions.additionalDirectories with sibling project paths
3. Launch Claude Code from the main workspace directory
4. Type @ to trigger file autocomplete

Expected Behavior

The @ autocomplete should suggest files from:

• The main workspace directory (current working directory)
• All directories listed in additionalDirectories

Actual Behavior

The @ autocomplete only suggests files from the main workspace directory. Files from additionalDirectories are not shown in suggestions, even though:

• The directories are correctly configured in settings.local.json
• Claude Code can read/write files in these directories when given explicit paths

Additional Notes

This behavior appears to be a regression - @ mentions previously included files from additionalDirectories.

Environment Info

• Platform: darwin
• Terminal: WarpTerminal
• Version: 2.1.7
• Feedback ID: f94c0e8a-568a-4e89-b35e-30cedefb080a

Errors

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