Why Claude Can Skip an Instruction Buried in the Middle of a Long System Prompt (and When Moving It Helps)
Claude is more likely to skip or under-weight an instruction sitting in the middle of a long system prompt than
Prompt Engineering
Building a Regression Test Suite for Claude Prompts With promptfoo: A Working Config
A regression test suite for a Claude prompt catches the thing manual spot-checking misses: a prompt that worked fine last
A Step-by-Step Prompt for Making Claude Cite the Exact Sentence Behind Every Claim
You make Claude cite the exact sentence behind every claim by forcing a two-pass structure: first it extracts word-for-word quotes
A Step-by-Step Prompt for Stopping Claude From Answering Outside Your Source Documents
Featured image: “Staples, Staple Remover, and Paper Documents” by Tony Webster, licensed under CC BY-SA 2.0. Telling Claude to “only
Why Vague Negative Instructions (“Don’t Do X”) in a System Prompt Get Ignored, and the Positive-Framing Fix
A system prompt that says “don’t be too formal” or “don’t give generic answers” often gets ignored by the model
Embedding a JSON Schema Directly in a Claude Prompt So Malformed Output Becomes Rare
A JSON schema embedded directly in a Claude prompt tells the model the exact shape an answer must take before
A Commented Checklist for Writing Tool Descriptions Claude Won’t Misread
Claude misreads a tool mainly when the tool’s own description leaves a decision up to guesswork: when to call it,
Setting Up Prompt Caching Breakpoints in the Claude API: A Working Example
Claude’s prompt caching lets you mark a prefix of a request so a later call can reuse it instead of
Building Your First Claude Skill: A Step-by-Step Walkthrough From SKILL.md to Invocation
A Claude Skill is a folder containing a SKILL.md file plus optional reference documents and scripts that teaches Claude how
Interleaved Thinking in Claude’s API: Beta Header, Budget Rules, and Model Support
Interleaved thinking lets Claude reason again after each tool call finishes, instead of only once before the first one —