- Implement comprehensive debug toolbar showing project name, session ID, client info, and uptime
- Add Django-style draggable toolbar with terminal aesthetics for multi-client identification
- Support custom JavaScript/CSS injection into all pages with session persistence
- Auto-injection system hooks into page creation lifecycle for seamless operation
- LLM-safe HTML comment wrapping prevents confusion during automated testing
- 5 new MCP tools: enable_debug_toolbar, inject_custom_code, list_injections, disable_debug_toolbar, clear_injections
- Session-based configuration storage with auto-injection on new pages
- Solves multi-parallel MCP client identification problem for development workflows
Tools added:
- browser_enable_debug_toolbar: Configure project identification overlay
- browser_inject_custom_code: Add custom JS/CSS to all session pages
- browser_list_injections: View active injection configuration
- browser_disable_debug_toolbar: Remove debug toolbar
- browser_clear_injections: Clean up custom injections
Files modified:
- src/tools/codeInjection.ts: Complete injection system (547 lines)
- src/context.ts: Added injection config and auto-injection hooks
- src/tools.ts: Registered new tools in main array
- test-code-injection-simple.cjs: Validation test suite
Addresses issue: "I'm running many different 'mcp clients' in parallel on the same machine.
It's sometimes hard to figure out what client a playwright window belongs to."
