diff --git a/AGENTS.md b/AGENTS.md
index 8b64118..28ae82b 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -204,3 +204,29 @@ Load operational references on demand, not every session:
   [`wiki/core/operations/sandbox.md`](./wiki/core/operations/sandbox.md).
 - **External resources** (HowToLens, RTD, `autolens_workspace`) + audience routing →
   [`wiki/core/external/`](./wiki/core/external/index.md), [`skills/_style.md`](./skills/_style.md) "Adaptive depth".
+
+<!-- repos_sync:history:begin -->
+## Never rewrite history
+
+NEVER perform these operations on any repo with a remote:
+
+- `git init` in a directory already tracked by git
+- `rm -rf .git && git init`
+- Commit with subject "Initial commit", "Fresh start", "Start fresh", "Reset
+  for AI workflow", or any equivalent message on a branch with a remote
+- `git push --force` to `main` (or any branch tracked as `origin/HEAD`)
+- `git filter-repo` / `git filter-branch` on shared branches
+- `git rebase -i` rewriting commits already pushed to a shared branch
+
+If the working tree needs a clean state, the **only** correct sequence is:
+
+    git fetch origin
+    git reset --hard origin/main
+    git clean -fd
+
+This applies equally to humans, local Claude Code, cloud Claude agents, Codex,
+and any other agent. The "Initial commit — fresh start for AI workflow" pattern
+that appeared independently on origin and local for three workspace repos is
+exactly what this rule prevents — it costs ~40 commits of redundant local work
+every time it happens.
+<!-- repos_sync:history:end -->