diff --git a/.changeset/th-marketplace-source-fix.md b/.changeset/th-marketplace-source-fix.md
new file mode 100644
index 00000000..3a1c2829
--- /dev/null
+++ b/.changeset/th-marketplace-source-fix.md
@@ -0,0 +1,7 @@
+---
+"@smooai/smooth": patch
+---
+
+fix(smooth marketplace): smooth-agent plugin failed to install ("source type your Claude Code version does not support")
+
+The marketplace used `metadata.pluginRoot` + a bare `"source": "smooth-agent"`. On Claude Code 2.1.196 that combination is rejected as an unsupported source type. Switched to the canonical explicit relative-path form `"./claude-plugins/smooth-agent"` (matching the official marketplace's working `"./plugins/<name>"` entries) and dropped `pluginRoot`. No change to the plugin itself.
diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
index 050ad40d..9d7cf2d3 100644
--- a/.claude-plugin/marketplace.json
+++ b/.claude-plugin/marketplace.json
@@ -6,13 +6,12 @@
         "email": "brent@smoo.ai"
     },
     "metadata": {
-        "description": "SmooAI team Claude Code plugins — Big Smooth orchestration (th claude), agent comms (th-mail), and pearls work tracking.",
-        "pluginRoot": "./claude-plugins"
+        "description": "SmooAI team Claude Code plugins — Big Smooth orchestration (th claude), agent comms (th-mail), and pearls work tracking."
     },
     "plugins": [
         {
             "name": "smooth-agent",
-            "source": "smooth-agent",
+            "source": "./claude-plugins/smooth-agent",
             "description": "Run a Big Smooth that drives Claude Code worker sessions over tmux (rate-limit-resilient), coordinate agents over th-mail, and track work in pearls. Provides the /smooth command.",
             "version": "0.1.0",
             "category": "orchestration",