The blackboard for coding agents is a session-toolbox that enables multiple AI coding assistants to collaborate autonomously on the same task. An orchestrator agent picks up tasks from a shared board, plans the work, and delegates to specialized agents running in parallel — for example, Gemini for research, Claude for implementation, and Codex for review. It provides slash commands like /agtx:brainstorm and /agtx:sweep, supports MCP server integration, and offers plugin extensibility.