[BUG] Naughty Claude made a bogus edit to a file not under consideration in the current task

Environment

• Platform (select one):
• [√] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.9 (Claude Code)
• Operating System: macOS 15.3
• Terminal: IntelliJ IDEA (Ultimate Edition) Build #IU-231.8770.65

Bug Description

I directed Claude to fix a bug in a specific file, the models danced for some time and came to a fix. At the end, a .sql file which is related but needed no change took a drive by hit.

% git diff video_cuts_schema.sql
diff --git a/video_cuts_schema.sql b/video_cuts_schema.sql
index ed350bb..cb500cf 100644
--- a/video_cuts_schema.sql
+++ b/video_cuts_schema.sql
@@ -1,4 +1,4 @@
--- Database: truth_tide_categories
+Clau-- Database: truth_tide_categories

So it opened a .sql file and inserted "Clau-".

Seemed odd.

Steps to Reproduce

1. Ask Claude to fix a bug in a vague hand wavey way
2. Observe Claude spinning for some time searching hither and thither
3. Observe Claude ask for permission to run a tool to check the sql database
4. Use this opportunity to interject and tell Claude where to find things
5. Claude completes the task

Reviewing the diff, I note the .sql file change.

Expected Behavior

Not to insert "Clau-" into a file not being edited.

Actual Behavior

A file not being edited, was.

Additional Context

There was a lot going on...