diff --git a/hooks/session-start b/hooks/session-start
index dc36a0d..2b7a763 100755
--- a/hooks/session-start
+++ b/hooks/session-start
@@ -7,7 +7,7 @@ const path = require("path");
 
 try {
   const pluginRoot = path.resolve(__dirname, "..");
-  const skillFile = path.join(pluginRoot, "skills", "using-archeflow", "SKILL.md");
+  const skillFile = path.join(pluginRoot, "skills", "using-archeflow", "ACTIVATION.md");
 
   if (!fs.existsSync(skillFile)) {
     console.log("{}");
diff --git a/skills/using-archeflow/ACTIVATION.md b/skills/using-archeflow/ACTIVATION.md
new file mode 100644
index 0000000..96e284b
--- /dev/null
+++ b/skills/using-archeflow/ACTIVATION.md
@@ -0,0 +1,22 @@
+# ArcheFlow -- Active
+
+Multi-agent orchestration using archetypal roles and PDCA quality cycles.
+
+## Session Start
+
+On activation, print ONE line then proceed silently:
+```
+archeflow v0.8.0 · 19 skills · <domain> domain
+```
+Domain: `writing` if `colette.yaml` exists, `research` if paper/thesis files, `code` otherwise.
+
+## When to Use
+
+| Need | Command |
+|------|---------|
+| Work the queue | `/af-sprint` |
+| Deep orchestration | `/af-run <task>` |
+| Code review | `/af-review` |
+| Simple fix / question | Skip ArcheFlow — just do it directly |
+
+Do NOT use ArcheFlow for: single-line fixes, questions, reading code, config tweaks, git ops.