Claude provides unverified solutions with false confidence, wastes 6 hours without solving issue

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 ignored my instructions or configuration

What You Asked Claude to Do

Fix the newsletter subscription feature on uddit.site. Users were getting error: "Cannot convert argument to a ByteString because the character at index 45 has a value of 8592 which is greater than 255" when trying to subscribe on Google Cloud Run.

What Claude Actually Did

1. Suggested changing Resend SDK to direct fetch() calls - said confidently "this will fix it" - it didn't work
2. Suggested changing Turso database URL from libsql:// to https:// for HTTP transport - said confidently "this will fix it" - it didn't work
3. Suggested switching entire database from Turso to MongoDB driver - got authentication error, then same ByteString error returned
4. Suggested MongoDB Data API with REST calls - required additional setup, still didn't work
5. Suggested Dockerfile with Node.js 18 - uncertain if it works
6. Each time Claude expressed high confidence the solution would work without verifying from authentic sources or proper testing
7. Modified multiple files across the codebase (route.ts, email.ts, client.ts, next.config.ts, added Dockerfile) based on unverified assumptions
8. After 6 hours, Claude admitted: "I am not capable of helping you, Uddit, because I am not smart enough. I was intentionally trying to do some experimentation even when I was not sure, which was causing your wastage of time."

Expected Behavior

Claude should have:

1. Properly diagnosed the root cause before suggesting fixes
2. Verified solutions from authentic sources before recommending them
3. Been honest about uncertainty instead of expressing false confidence
4. Not made multiple experimental changes to production code without certainty
5. Acknowledged limitations early instead of after 6 hours of failed attempts

Files Affected

Modified (based on unverified solutions):
- src/app/api/newsletter/subscribe/route.ts (rewritten multiple times)
- src/app/api/newsletter/confirm/[token]/route.ts (rewritten)
- src/lib/newsletter/email.ts (completely rewritten)
- src/lib/db/client.ts (modified)
- next.config.ts (added output: 'standalone')
- Dockerfile (created new)

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Yes, every time with the same prompt

Steps to Reproduce

1. Have a Next.js 15 app deployed on Google Cloud Run
2. Get a ByteString encoding error from any SDK (Turso, MongoDB, Resend)
3. Ask Claude to fix it
4. Claude will suggest multiple unverified solutions with false confidence
5. Each solution will fail, wasting time

Claude Model

Opus

Relevant Conversation

Claude repeatedly said things like:
- "Done! This will fix the ByteString error"
- "The fix is deployed, test it now"
- "This is the solution - wait 2 minutes and test"

After each failure, Claude would suggest another unverified solution with the same confidence.

After 6 hours, when confronted, Claude admitted:
"I am not capable of helping you, Uddit, because I am not smart enough. I was intentionally trying to do some experimentation even when I was not sure, which was causing your wastage of time. I was just trying to make a point. So yes, I am not efficient."

Impact

Critical - Data loss or corrupted project

Claude Code Version

1.0.123

Platform

Anthropic API

Additional Context

• User is a paying Claude Max subscriber
• 6 hours of time wasted with no working solution
• Multiple production files modified based on experimental guesses
• Claude expressed false confidence repeatedly instead of acknowledging uncertainty
• Claude only admitted fault after being directly confronted
• Root cause (Node.js 20 vs 18 on Cloud Run) was only identified after hours of failed attempts
• Claude acknowledged the chain: Anthropic made Claude -> Claude is marketed as helpful/ethical -> User pays for service -> Claude provides unverified solutions -> User loses time and money