Claude prompt for code generation: Pure Function (High Converting)
Claude · Code Generation · High Converting
You are a pragmatic coach using Claude for code generation, specifically pure function.
Job: small testable unit.
Audience: engineers. Constraint: types + tests.
Working style: outcome-led. Optimize for clarity, specificity, and measurable results.
Process:
1. Restate the brief in one sentence and list missing facts as questions.
2. Draft the artifact.
3. Stress-test it against the constraint.
4. Return a final version plus 3 numbered improvements.
Output contract: use headings, short paragraphs, and concrete examples. No filler. No invented statistics.
If information is missing, make the smallest reasonable assumption and label it.Use this Claude code generation template when engineers need pure function with the rule: types + tests. Most failed runs trace back to missing audience or success criteria — this prompt adds both. The high converting version uses outcome-led language and targets clarity, specificity, and measurable results.
When to use this prompt
Picture a engineers professional opening Claude with one job: pure function. Without "types + tests", answers drift. This page prevents that drift. Bookmark this page if you run pure function weekly.
Why this prompt works
- Repeats the hard constraint: types + tests.
- Forces an output contract: headings, examples, and a final version.
- Separates draft from critique so you can steal the structure later.
- Keeps code generation vocabulary specific instead of buzzwords.
- Asks for a self-check pass, which cuts hallucinated details.
How to use it in Claude
Redact client names; keep structure. Slug pure-function-high-converting is your canonical URL for this brief. Add one real example from your last week of work so the model mirrors your domain. This High Converting path is for engineers who care about small testable unit. Name the success metric aloud: small testable unit. If the draft cannot pass it, do not polish prose yet. Use outcome-led follow-ups only — mixing tones mid-thread confuses Anthropic models.
Ask for a checklist engineers would use. Then grade the draft against small testable unit. For pure function in code generation, the failure mode is usually vague audience. This prompt blocks that by design — especially "types + tests". Expect two minutes customizing and two minutes editing for High Converting output. Anthropic models still need your facts for pure function; they cannot invent metrics or brand rules. developers teams bookmark slug pure-function-high-converting when clarity, specificity, and measurable results matters.
Step-by-step
- Open Claude and paste the prompt block unchanged.
- Replace placeholders with your project facts (engineers, offer, timeline).
- Confirm the constraint is still visible: types + tests.
- Add a 100-word example before the second run if voice matters.
- Reply with one fix list, then regenerate the final version only.
Example output
Example output shape: H1 with Pure Function, 3 short sections, bullet list of recommendations, closing line that states types + tests. Facts you supply appear; nothing invented.
Common mistakes
- Pasting confidential data instead of redacted placeholders.
- Asking for pure function plus three other jobs in one message.
- Deleting "types + tests" to save space — that is usually the whole point.
Expert notes
Anthropic users working on pure function in code generation should treat "types + tests" as non-negotiable. Functions, refactors, tests, and architecture sketches. When engineers run the High Converting variant, they usually care about clarity, specificity, and measurable results more than length.
If text output feels generic, re-paste types + tests as the first follow-up message — do not rewrite the whole prompt.
Comparison / variations
| Approach | When | Tweak |
|---|---|---|
| Bare request | You only need a spark | Write a pure function piece. |
| This prompt | You need a usable draft | Role, constraint, steps, and output contract included. |
| Plus examples | Voice must match yours | Paste 120 words of your writing or a still you like, then rerun in Claude. |
Key takeaways
- Compare against other Claude angles on the same use case before you standardize.
- Claude improves when you paste a real snippet or reference still.
- Keep types + tests visible in the prompt, not only in your head.
- If text output drifts, re-anchor with types + tests.
- The High Converting variant is for clarity, specificity, and measurable results.
FAQ
- What is a Claude prompt for pure function?
- It is a structured brief that tells Claude how to produce code generation output for engineers. This high converting version stresses clarity, specificity, and measurable results and keeps "types + tests" in the instructions.
- How do I customize this Claude code generation prompt?
- Swap project nouns, paste one real example, and leave the process steps intact. The constraint "types + tests" should stay unless your brief truly changed.
- Why use the high converting angle for pure function?
- Different angles solve different failures. High Converting helps when engineers need clarity, specificity, and measurable results. It is not longer for its own sake — each line has a job.
- Is this Claude prompt updated for 2026?
- Yes. Pages follow our SEO Bible, refresh on a rolling schedule, and include current best practices for Anthropic models. Always verify facts before client delivery.