Positive substitution style guides
Parent: Prompt-side control of LLM lexical tics · Published reference · snapshot 2026-09-23
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Source-anchored research for Positive substitution style guides. Run status: COMPLETED.
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Definitions
- Anthropic's own guidance is not purely positive: for removing preambles it recommends 'Respond directly without preamble. Do not start with phrases like Here is..., Based on..., etc.', and adds post-processing as a fallback. Positive substitution is a preference, not a rule the vendor applies to itself. (medium confidence) (verified as of 2026-09-23) [source]
Comparisons and alternatives
- Anthropic's prompting best-practices doc lists 'Tell Claude what to do instead of what not to do' as a way to steer output formatting, with the example: replace 'Do not use markdown in your response' with 'Your response should be composed of smoothly flowing prose paragraphs.' (medium confidence) (verified as of 2026-09-23) [source]
- The stated rationale is that a negative instruction 'removes one option and leaves the rest open', so the model chooses an unintended alternative; a positive style description gives the model a voice to hold instead of a list to steer around. This is asserted reasoning, not measured in the sources. (low confidence) [source]
- In a small August 2026 code-review experiment (three synthetic samples), a positive inclusion-criteria phrasing flagged 0/3 false problems versus 2/3 for both no instruction and a prohibition; on the production prompt, positive and negative phrasing detected the same bugs. The authors conclude positive framing helps judgment calls and generative tasks, while simple behavioral guardrails tolerate negative phrasing. (low confidence) (verified as of 2026-08-31) [source]
Facts and statements
- Anthropic's docs also advise matching the prompt's own style to the desired output (for example, removing markdown from the prompt reduces markdown in the output), which is a positive-by-example lever alongside stated instructions. (low confidence) (verified as of 2026-09-23) [source]
- The same experiment's authors state that a prohibition weakens across a long, open-ended generation, which they use to argue for positive phrasing in stylistic output. This is the closest source found to the lexical-tic use case; it is a blog claim, not a controlled result. (low confidence) (verified as of 2026-08-31) [source]
Children
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