What problem does it solve? Tuning an OpenCode agent setup requires knowing which config files, prompt override paths, and schema rules oh-my-opencode-slim supports, and mistakes can silently change cost, permissions, or delegation behavior. This Skill guides safe, minimal configuration changes so agents behave the way you want across future sessions. ## Core Features & Use Cases - Agent and model tuning: Assign models, variants, skills, and MCP permissions per built-in agent (orchestrator, oracle, librarian, explorer, designer, fixer, observer, council) within presets. - Prompt customization: Append or replace built-in agent prompts via markdown override files, with preset-specific variants and a defined lookup order. - Custom agents: Define narrow specialist agents under agents.<name> with prompt and orchestratorPrompt so the Orchestrator routes work correctly. - Use Case: You notice the Orchestrator keeps spawning parallel writers that conflict. The Skill proposes a small rule in orchestrator_append.md, asks for confirmation, applies it, and reminds you to restart OpenCode. ## Quick Start Ask the assistant to review your oh-my-opencode-slim config and propose a cheaper model assignment for the explorer and librarian agents.