The agentic harness for AI coding agents — intelligence is rented, the harness is owned. Runs the full work cycle: intent briefs, bounded RAG context from real code intelligence, persistent memory, preventive guardrails, and performance evals. One CLI + MCP server, SQLite inside. Claude Code, Codex, Gemini CLI, Cursor & OpenCode.
When we first launched prjct/cli, the idea was to work with every AI editor @Claude Code, @Cursor, @Windsurf (my fav), @Codex by OpenAI. Sounded great, right? But in practice it was a mess:
Tons of extra code just for compatibility
Features blocked because we had to play lowest-common-denominator