atlas-ai-tooling-prompt-engineering

Knowledge base behind the prompt-engineer agent and /prompt-optimize: the source-of-truth order for model facts, the model-class gate, and six on-demand references covering reasoning patterns, output-shape enforcement, extraction prompting, judge prompts, agent and tool instructions, and dated vendor guidance. TRIGGER WHEN: designing, reviewing or optimizing a prompt, system message or agent instructions; forcing JSON or a schema out of a model, especially a small one such as Gemma; prompting for extraction (NER, relations, events, fields from documents); deciding whether a reasoning scaffold, few-shot examples or a thinking budget belongs in a prompt; writing an LLM-as-judge prompt; writing a tool description, an instruction file, a skill description or an orchestrator brief. DO NOT TRIGGER WHEN: building an agent on the Claude Agent SDK (use agent-sdk-builder), or the question is about a model's pricing or API surface with no prompt involved.