Add whatidid skill — turn your Copilot sessions into proof of impact (#1319)

* Add whatidid skill — Copilot impact report generator

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix: use single quotes for description in SKILL.md frontmatter

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Convert from skill to external plugin per reviewer feedback

Address @aaronpowell's review: convert whatidid from a bundled skill
to an external plugin referencing microsoft/What-I-Did-Copilot.
This improves supply chain transparency and stays current with
the source repo.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/plugin/marketplace.json

@@ -573,6 +573,31 @@
       "description": "Comprehensive collection of prompts, instructions, and resources for building declarative agents and API plugins using TypeSpec for Microsoft 365 Copilot extensibility.",
       "version": "1.0.0"
     },
+    {
+      "name": "whatidid",
+      "description": "Turn your Copilot sessions into proof of impact — research-grounded HTML reports with effort estimation, skills analysis, and ROI metrics from local session logs.",
+      "version": "1.0.0",
+      "author": {
+        "name": "Microsoft",
+        "url": "https://www.microsoft.com"
+      },
+      "homepage": "https://github.com/microsoft/What-I-Did-Copilot",
+      "keywords": [
+        "copilot",
+        "productivity",
+        "impact",
+        "report",
+        "estimation",
+        "roi",
+        "session-logs"
+      ],
+      "license": "MIT",
+      "repository": "https://github.com/microsoft/What-I-Did-Copilot",
+      "source": {
+        "source": "github",
+        "repo": "microsoft/What-I-Did-Copilot"
+      }
+    },
     {
       "name": "winui3-development",
       "source": "winui3-development",

plugins/external.json

@@ -138,5 +138,22 @@
       "source": "github",
       "repo": "figma/mcp-server-guide"
     }
+  },
+  {
+    "name": "whatidid",
+    "description": "Turn your Copilot sessions into proof of impact — research-grounded HTML reports with effort estimation, skills analysis, and ROI metrics from local session logs.",
+    "version": "1.0.0",
+    "author": {
+      "name": "Microsoft",
+      "url": "https://www.microsoft.com"
+    },
+    "homepage": "https://github.com/microsoft/What-I-Did-Copilot",
+    "keywords": ["copilot", "productivity", "impact", "report", "estimation", "roi", "session-logs"],
+    "license": "MIT",
+    "repository": "https://github.com/microsoft/What-I-Did-Copilot",
+    "source": {
+      "source": "github",
+      "repo": "microsoft/What-I-Did-Copilot"
+    }
   }
 ]