S01¶


Research	R0020 — Prompt Engineering Gaps
Run	2026-03-25
Query	Q003
Search	S01

WebSearch — Imperative constraints and MUST/MUST NOT directives in prompt engineering

Summary¶

Field	Value
Source/Database	WebSearch
Query terms	prompt engineering imperative constraints MUST NOT directives explicit instructions best practices
Filters	None
Results returned	10
Results selected	3
Results rejected	7

Selected Results¶

Result	Title	URL	Rationale
S01-R01	Prompting best practices - Claude API Docs	https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/claude-prompting-best-practices	Primary vendor documentation from Anthropic
S01-R02	The Ultimate Guide to Prompt Engineering in 2026 - Lakera	https://www.lakera.ai/blog/prompt-engineering-guide	Comprehensive industry guide with constraint discussion
S01-R03	Prompt Engineering Basics (2026) - Medium	https://medium.com/@mjgmario/prompt-engineering-basics-2026-93aba4dc32b1	Industry source recommending imperative language

Rejected Results¶

Result	Title	URL	Rationale
S01-R04	Defining Constraints for Effective Prompts - CodeSignal	https://codesignal.com/learn/courses/prompting-foundations/lessons/defining-constraints-and-requirements-for-effective-prompts	Content not extractable (minified JS)
S01-R05	Best practices - OpenAI Help Center	https://help.openai.com/en/articles/6654000-best-practices-for-prompt-engineering-with-the-openai-api	403 access error
S01-R06	Prompt engineering - OpenAI API	https://platform.openai.com/docs/guides/prompt-engineering	403 access error
S01-R07	Prompt Engineering Guide - Infomineo	https://infomineo.com/artificial-intelligence/prompt-engineering-techniques-examples-best-practices-guide/	General guide without specific constraint focus
S01-R08	Prompt engineering best practices - Claude blog	https://claude.com/blog/best-practices-for-prompt-engineering	Duplicate of Anthropic docs
S01-R09	Best practices for LLM prompt engineering - Palantir	https://www.palantir.com/docs/foundry/aip/best-practices-prompt-engineering	Enterprise-specific
S01-R10	What is Prompt Engineering - Salesforce	https://www.salesforce.com/artificial-intelligence/prompt-engineering/?bc=OTH	General overview

Notes¶

OpenAI's documentation was inaccessible (403 errors on both help center and API docs). This is a significant gap. Anthropic's documentation was successfully fetched and provides the most detailed vendor perspective.