[MODEL] Go version ignored when considering available APIs, refactored to previous in multiple occurrences

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 made incorrect assumptions about my project

What You Asked Claude to Do

Fix a multithreading bug

What Claude Actually Did

Ignore the Go version (being v1.25+) and assume that "WaitGroup.Go(…)" was unavailable, and it needs to refactor/revert to "WaitGroup.Add(…)" before actually fixing the problem. https://appliedgo.net/spotlight/go-1.25-waitgroup-go/

Expected Behavior

Check the Go version on the system and in "go.mod" to verify which APIs are available

Files Affected

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Sometimes (intermittent)

Steps to Reproduce

_No response_

Claude Model

Not sure

Relevant Conversation

Impact

Medium - Extra work to undo changes

Claude Code Version

1.0.128

Platform

Anthropic API

Additional Context

_No response_