portlang - the environment-first agent framework. Use when working with .field files, defining boundaries and verifiers, adding custom tools (shell, Python, MCP), debugging trajectories, measuring convergence, configuring structured JSON output with output_schema, running batch evals, viewing HTML trajectory dashboards, or analyzing agent behavior across runs. portlang manages environments not loops - you define the search space, the agent finds the path.
2026-03-23