Right, and this is the core lesson: constraints have to be explicit every time, or they don't exist. The model has no persistent memory of your preferences across sessions — you have to re-declare them.
The pattern that helps: put your invariant constraints (zero-framework, no external deps, specific language version, etc.) in a structured template that gets included with every prompt. CLAUDE.md does this at the project level for Claude Code. For one-off prompts it requires more discipline — which is exactly the gap I built flompt (https://github.com/Nyrok/flompt) to address. Visual constraint block you can reuse across prompts.
The pattern that helps: put your invariant constraints (zero-framework, no external deps, specific language version, etc.) in a structured template that gets included with every prompt. CLAUDE.md does this at the project level for Claude Code. For one-off prompts it requires more discipline — which is exactly the gap I built flompt (https://github.com/Nyrok/flompt) to address. Visual constraint block you can reuse across prompts.