diff --git a/.machine_readable/root-allow.txt b/.machine_readable/root-allow.txt
index 728ff87..20776de 100644
--- a/.machine_readable/root-allow.txt
+++ b/.machine_readable/root-allow.txt
@@ -38,6 +38,7 @@ abi.ipkg                   # Idris2 package for the ABI seam; sourcedir=src/inte
 .gitignore
 .tool-versions
 CLAUDE.md                  # AI session instructions, generated by the arrival-pack from .machine_readable/ a2ml and read by agents at repo root (do not hand-edit; edit the a2ml source)
+GEMINI.md                  # Root-level pointer to CLAUDE.md for Gemini agents; avoids duplicating agent instructions.
 .hypatia-ignore            # repo-scoped Hypatia scanner exemptions; the scanner reads it from the repo root
 sonar-project.properties   # SonarCloud analysis config; the SonarQube scan action reads it from the repo root
 
diff --git a/GEMINI.md b/GEMINI.md
new file mode 100644
index 0000000..417391d
--- /dev/null
+++ b/GEMINI.md
@@ -0,0 +1,8 @@
+# Pointer
+
+This repository has no `AGENTS.md` yet. Until it does, the instructions
+for every coding agent live in **[CLAUDE.md](./CLAUDE.md)**. Read that
+file, and skip anything in it that is specific to Claude Code tooling.
+Do not duplicate rules here.
+
+When `AGENTS.md` lands in this repository, retarget this pointer at it.