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+# 2026-02-27 Session Notes
+
+## Block Co-Authored-By Attribution Hook Implementation
+
+Nicholai requested implementation of a PreToolUse hook to block any git commits that contain Claude Code's automatic "Co-Authored-By: Claude" attribution. The session involved planning and beginning implementation of the blocking mechanism.
+
+## Technical Approach
+
+The solution uses a bash script (`~/.claude/hooks/block-coauthor.sh`) that intercepts Bash tool calls before execution. The hook reads JSON input via stdin, extracts the git command being run using `jq`, and scans for the case-insensitive pattern `Co-Authored-By:.*Claude`. If found, it outputs a JSON response with `permissionDecision: "deny"`; otherwise it exits cleanly to allow execution.
+
+The PreToolUse hook is registered in `~/.claude/settings.json` with a 5-second timeout and matcher targeting the Bash tool.
+
+## Work Completed
+
+Read existing `settings.json` to understand the hook structure and confirm the format for adding new hook entries. The file contains existing SessionStart, UserPromptSubmit, and SessionEnd hooks that call signet commands.
+
+## Next Steps
+
+Create the bash script and update settings.json to register the PreToolUse hook. Test by attempting a commit through Claude Code (should be blocked) and a manual git commit outside Claude (should work normally).
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