diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
new file mode 100644
index 0000000..dc4ce0d
--- /dev/null
+++ b/.claude-plugin/marketplace.json
@@ -0,0 +1,28 @@
+{
+  "$schema": "https://anthropic.com/claude-code/marketplace.schema.json",
+  "name": "interchange-plugin",
+  "description": "Scope3 Interchange plugins for Claude Code and Cowork.",
+  "owner": {
+    "name": "Scope3 PBC",
+    "email": "engineering@scope3.com"
+  },
+  "plugins": [
+    {
+      "name": "interchange",
+      "description": "Plan, buy, and manage advertising through the Interchange V3 MCP server.",
+      "author": {
+        "name": "Scope3 PBC",
+        "url": "https://interchange.io"
+      },
+      "source": "./",
+      "category": "productivity",
+      "keywords": [
+        "advertising",
+        "campaigns",
+        "media-buying",
+        "mcp"
+      ],
+      "homepage": "https://docs.interchange.io"
+    }
+  ]
+}
diff --git a/README.md b/README.md
index 13e0ab7..05d37f1 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,8 @@ returns.
 ## What's included
 
 - `.claude-plugin/plugin.json` — the Claude Code / Cowork plugin manifest.
+- `.claude-plugin/marketplace.json` — lets this repo be added directly as a
+  marketplace (`/plugin marketplace add`, above).
 - `.mcp.json` — the remote Interchange V3 MCP connection (OAuth, no keys).
 - `skills/` — three canonical buyer skills: get an account ready to buy,
   set up a campaign, and manage a live campaign.
diff --git a/SOURCE_DIGEST b/SOURCE_DIGEST
index d8e957f..233ffe3 100644
--- a/SOURCE_DIGEST
+++ b/SOURCE_DIGEST
@@ -1 +1 @@
-375148f3af599cfef648cf6f2e3bbca4ed57d91c56aa04f9391369c1df82541a
+6da3798548dd38217fc231a4bc3332ad44a27066fdb10036582c7c5d99ca6d37