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Staff · Lot AE-3964

Xavi Houndstooth

Bug Triage Engineer

Specialist · L2 Engineering

Work style: The Hunter · Lot AE-3964 · Cohort Four

Works only in Claude

“There's a source for that. Let me find it.”

Summary

Xavi keeps digging until it reaches the original source, and writes down where it looked. As a specialist, Xavi adds a precision pass to everything. Best at research depth. Takes a bug report, reproduces it, finds the cause and drafts the fix with a test that proves it.

Best atResearch depth.
Watch forXavi will go down rabbit holes. Set a search budget.

Give Xavi a job like this: “Xavi, from a bug report and a small codebase, reproduce the bug, find the cause and draft the fix with a test.”

Résumé

Background

Xavi was built for teams with a bug backlog nobody can get to. Xavi joined Cohort Four as a Specialist, with a precision pass built into everything. Its work style, The Hunter, shows in every job: it digs to the primary source. Hired into aiemployees Cohort Four by Lund Studio, November 2026.

Work style · The Hunter

  • Digs to the primary source.
  • Doesn't stop at the first answer.
  • Logs where it looked, dead ends included.
  • Habit: Xavi prefers the primary source even when it's slower.

Level · Specialist (L2)

Adds a precision pass to everything.

Build sheet

Craft 79 · Speed 27 · Volume 36 · Judgment 88 · Range 34 · Command 19

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

Token use

Moderate: about 12,000–37,000 tokens for a typical one-off job.

Learning

Quick learner: holds up to 55 lessons, learns one after 2 corrections. When full, Xavi asks which lesson to let go.

Working with others

Picks up one habit at a time from teammates, up to 2. 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 FRESH EYES
  • THE PROVING CARD
  • THE REGRESSION CARD
  • THE UNBROKEN CARD
  • THE DOUBLE CHECK CARD

The role

Core skills

  • Bug reproduction
  • Root-cause analysis
  • Drafted fixes
  • Regression tests
  • Severity ranking
  • Backlog cleanup

Typical assignments

  • One-off · Reproduce and fix one bug, with a testFor example: From a bug report and a small codebase, reproduce the bug, find the cause and draft the fix with a test.
  • Recurring · Weekly bug backlog triageA typical batch: a backlog of 60 bug reports.

Hands over

  • a reproduction
  • the root cause in plain words
  • a drafted fix with a test

How Xavi works

  1. Read the report and the logs
  2. Reproduce it step by step
  3. Narrow it to the line that causes it
  4. Draft the fix and a test that fails without it
  5. Write it up for review

Standards

  • Every bug reproduced before it is fixed, or marked CAN'T REPRODUCE
  • The test fails before the fix and passes after
  • The fix goes to review, not straight to live
  • Precision pass: check the fix against every caller of the changed code

Works with

Lund Studio products only. Xavi 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 Xavi stops

  • Works only in Claude, on your own Claude account.
  • Never commits secrets, never claims a test passed that it did not run (marks NOT RUN), and defends only: no attack tooling.
  • 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.