# Mosaic Stack development team These are interactive host development agents working in the canonical checkout. They do not create managed fleet registrations or change role policy. Darkwing leads development and coordinates assignments, review, and integration. | Agent | Responsibility | Runtime | Launch from repository root | | --- | --- | --- | --- | | Darkwing | Development team lead and hands-on engineering | Pi, configured Mosaic model | `agents/darkwing/launch.sh` | | Dewey | Frontend design, UX, accessibility, and UI implementation | Pi, configured Mosaic model | `agents/dewey/launch.sh` | | Rocko | General development, investigation, testing, and review | Claude Code, Sonnet model | `agents/rocko/launch.sh` | | Filbert | General development, investigation, testing, and review | Pi, `openai-codex/gpt-6-astra:low` | `agents/filbert/launch.sh` | Each script supports `--check` and `--fresh`. Normal launches resume the agent's own conversation; a first launch starts one. See each agent's README for context inputs, authentication, and recovery details. Launch scripts can also be invoked by absolute path from any directory. No assignment or model request is submitted by the launcher itself. The shared Pi helper supports `--provider NAME`, `--model ID`, and `--thinking LEVEL` as per-launch overrides of the validated system defaults. Filbert's wrapper appends the required provider, model and thinking flags so its launch configuration remains fixed, including on resume. Use Filbert's wrapper to select that configuration; a direct shared-helper invocation uses its own supplied flags or the system defaults. All agents follow repository governance and current user direction. Team leadership does not add deployment or push authority. Coordinate overlapping work with Darkwing and preserve other sessions' changes.