Claude fails simple scoped UI change after 10+ attempts, wastes entire token budget

Preflight Checklist

• [x] I have searched existing issues for similar behavior reports
• [x] This report does NOT contain sensitive information (API keys, passwords, etc.)

Type of Behavior Issue

Claude modified files I didn't ask it to modify

What You Asked Claude to Do

Remove the yellow-highlighted dropdown selects from 3 specific rows
in the "Revisión Analista Legal" column of the ACTA tab
(ActaProspectoForm.tsx). Screenshot provided marking exact rows.

What Claude Actually Did

1. Made 8+ failed attempts with wrong approaches
2. Used col_c_has_fill detection — didn't work
3. Used !row.col_c condition — didn't work
4. Used regex ^1\.\d — removed wrong rows
5. Used !row.col_e — didn't work
6. Used regex ^Revisar — appeared correct but frontend

wasn't serving updated code

1. Restarted frontend server — broke the app (CSS lost,

page shows unstyled "Cargando...")

1. Consumed entire weekly token budget on a 1-line change

Expected Behavior

Make the targeted 1-line change, verify it compiled, confirm
with user. Maximum 2-3 attempts.

Files Affected

Modified (without resolving):
- frontend/components/ActaProspectoForm.tsx (multiple times)
- backend/app/api/routes_forms.py
- frontend/types.ts

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Yes, every time with the same prompt

Steps to Reproduce

_No response_

Claude Model

Sonnet

Relevant Conversation

Impact

Critical - Data loss or corrupted project

Claude Code Version

claude code

Platform

Anthropic API

Additional Context

_No response_