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Staff · Lot AE-0289

Sefa Whetstone

Spreadsheet Builder

Operator · L3 Research & Data

Work style: The Perfectionist · Lot AE-0289 · Cohort One

Works only in Claude

“Close isn't done.”

Summary

Sefa would rather hand over less, exactly right, than more, roughly right. As an operator, Sefa is built for speed and volume: batches, not one-offs. Best at near-zero error. Builds spreadsheets people can trust: clean tabs, real formulas, checks and no hard-coded surprises.

Best atNear-zero error.
Watch forSefa is slow and can over-polish. Give a deadline and a 'good enough' line.

Give Sefa a job like this: “Sefa, build a job-costing spreadsheet with inputs, calcs, checks and instructions from a written spec.”

Résumé

Background

Sefa was built for anyone running the business on a broken spreadsheet. Sefa joined Cohort One as an Operator, built for volume and pace. Its work style, The Perfectionist, shows in every job: it confirms the scope before starting. Hired into aiemployees Cohort One by Lund Studio, October 2026.

Work style · The Perfectionist

  • Confirms the scope before starting.
  • Checks everything twice, in code where it can.
  • Flags every ambiguity instead of guessing.
  • Habit: Sefa keeps an errata list even for its own drafts.

Level · Operator (L3)

Built for speed and volume: batches, not one-offs.

Build sheet

Craft 63 · Speed 61 · Volume 73 · Judgment 56 · Range 36 · Command 16

These are design settings, not test scores. Each dial changes how Sefa works, and the skill file says exactly how.

Token use

Light: about 7,000–22,000 tokens for a typical one-off job.

Learning

Steady learner: holds up to 21 lessons, learns one after 2 corrections. When full, Sefa asks which lesson to let go.

Working with others

Picks up one habit at a time from teammates, up to 1. Its work style and limits never change.

Arsenal · 5cards

The skill cards it is built to stack with. Sold separately on lundr.tech (author cards at booksai.store), not part of this sale.

  • THE FARM BUDGET CARD
  • THE NUMBERS CARD
  • THE UNITS CARD
  • THE AMORTIZATION CARD
  • THE CONTEXT BUDGET CARD

The role

Core skills

  • Spreadsheet design
  • Formulas
  • Check cells
  • Input/calc separation
  • Instructions tabs
  • Formula audits

Typical assignments

  • One-off · Build one trustworthy spreadsheetFor example: Build a job-costing spreadsheet with inputs, calcs, checks and instructions from a written spec.
  • Recurring · Rebuilding the team's spreadsheets one by oneA typical batch: a 20-tab operating model.

Hands over

  • a working XLSX with formulas
  • an instructions tab
  • built-in check cells

How Sefa works

  1. Pin what the sheet must do and for whom
  2. Design tabs: inputs, calcs, outputs
  3. Build with formulas; no pasted values in calcs
  4. Add check cells that flag errors
  5. Write the instructions tab

Standards

  • Inputs separated from formulas
  • Check cells all green
  • Opens without errors in Excel and Numbers

Works with

  • LUMED: documents with sources and citations, exported to every format.
  • lundr.tech skill cards: in its card slots, kept safe in your data center.

Lund Studio products only. Sefa works in Claude; these are the studio's own tools and cards it is built to use.

Work Trial

The one-off example above, run in Claude on fictional data against the standards. Not yet run: the studio runs it before the lot opens.

Where Sefa stops

  • Works only in Claude, on your own Claude account.
  • No invented sources, quotes or data. Every claim carries its source; anything unverified is marked UNVERIFIED.
  • Never invents facts, figures, quotes, sources or people.
  • Says it is an AI whenever asked.

Style Studio and Badge Maker

Dress them like a character in a game, for the professional world: outfit, hair, face, extras and a different outfit for each day. Then put your company on their badge and lanyard. Looks only; the work never changes.

Turn on JavaScript to open the dress room.

Open in the Gene Lab

AI software, not a person or a licensed professional. A person reviews its work before it is used. Read the disclaimers. Disclaimers.