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  1. Users
  2. Harper Mitchell
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Harper Mitchell

harper.mitchell@northline.aiProduct Designer · Product
Tools used
GeminiCopilot
AI spend (3 mo)$3,262.99
Savings$1,060.15

Harper's Token Efficiency Over Time

Score out of 100 · cooled off after a peak

Harper's Monthly AI Spend

Spend up 9% as usage expanded

What improved Harper's usage

  • Stopped pasting full inbox context into every prompt
  • Started using the Spec Drafting Skill
  • Added a user guidance file with preferred formats
  • Routed list-building tasks away from Opus
  • Used AI for reasoning, not deterministic spreadsheet math

Harper's top workflow

Roadmap Briefs

Quarterly themes, bet writeups, and stakeholder updates

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$1,17813 convos

Harper vs Product

Efficiency vs. cost compared with teammates
Efficiency vs. Cost
EfficiencyToken Spend

Harper's user.md

user.mdVery Efficient
23 lines · under the ~40-line always-on budget
# user.md

You're an experienced Product Designer working on product UX for B2B operators. You turn research and constraints into clear flows, and partner tightly with Engineering and PMs.

## Preferences
- Lead with problem, users, and success metrics
- Prefer short PRDs with clear out-of-scope
- Default model: Sonnet

## Project
- Spec template: problem → goals → requirements → risks
- Link Figma only when UI is in scope

## Do not
- Attach entire Drive folders
- Invent roadmap commitments

## Load on demand
- @prd.md · @competitive.md · @release.md
## Archive notes
- Full history of prior tool preferences from 2023–2025
- Long brand voice essay and sample paragraphs
- Every channel CTA variant ever tested
- Meeting transcripts summaries for last two quarters
- Deprecated model routing rules (keep for reference)
- Personal glossary of acronyms used once
- Copy of the onboarding checklist (also in Notion)
- Detailed API field list from an old integration