diff --git a/.claude/settings.json b/.claude/settings.json
index c9b8ff6a..0f8209a4 100644
--- a/.claude/settings.json
+++ b/.claude/settings.json
@@ -1,4 +1,8 @@
 {
+  "attribution": {
+    "commit": "",
+    "pr": ""
+  },
   "permissions": {
     "allow": [
       "Bash",
diff --git a/CLAUDE.md b/CLAUDE.md
index 0f844243..be3fe631 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -2,6 +2,14 @@
 
 This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
 
+## Attribution Policy
+
+- **Never** add "Co-authored-by: Claude" or any Claude/AI attribution to git commits
+- **Never** add comments like "Generated by Claude", "AI-generated", or similar in source code
+- **Never** list Claude as a contributor in any file (package.json, csproj, README, etc.)
+- All commits should appear as authored solely by the developer — do not modify git author/committer config
+- Do not append the claude.ai session URL to commit messages
+
 ## What This Is
 
 Modular monolith framework for .NET with compile-time module discovery via Roslyn source generators. Frontend uses React 19 + Inertia.js served via Blazor SSR.
@@ -252,4 +260,4 @@ Biome is configured at repo root (`biome.json`). Covers `modules/**`, `packages/
 
 - **Simplicity First**: Make every change as simple as possible. Impact minimal code
 - **No Laziness**: Find root causes. No temporary fixes. Senior developer standards
-- Don't claude to the commit messages
+- Never add Claude/AI attribution to commits or source code (see Attribution Policy above)