[Bug] Agent behavior changed from localhost:3000 to file system without user configuration change

Problem Description

Agents suddenly changed from working through localhost:3000 to working directly with the file system (/Users/username/project) without any configuration changes on my end.

Previous Behavior (Working)

• Agents consistently used http://localhost:3000 for all operations
• This worked reliably until yesterday (September 3, 2025)

Current Behavior (Broken)

• Agents now work directly with file paths like /Users/Danallovertheplace/Storey
• No longer using the localhost:3000 development server

Environment

• Platform: macOS (Darwin 24.3.0)
• Claude Code CLI with CLAUDE_CODE_ENTRYPOINT=cli
• Working directory: /Users/Danallovertheplace/Storey
• Dev server running on port 3000 (confirmed with lsof -i :3000)

Project Configuration

Project has explicit instructions in CLAUDE.md requiring agents to use localhost:3000:

## Agent URL Requirements
- **ALWAYS use localhost:3000 for agents**: When referencing the application URL, agents must use `http://localhost:3000`
- **NEVER use file system paths** as URLs for the application
- Agents should connect to the running dev server, not file paths

Impact

This breaks the expected workflow and development environment setup that was working previously.

Request

Please restore the previous agent behavior or provide configuration options to use localhost:3000 instead of direct file system access.