diff --git a/Session.omnifocusjs/Resources/en.lproj/manifest.strings b/Session.omnifocusjs/Resources/en.lproj/manifest.strings
new file mode 100644
index 0000000..d2e3384
--- /dev/null
+++ b/Session.omnifocusjs/Resources/en.lproj/manifest.strings
@@ -0,0 +1 @@
+"zone.bytes.session" = "OmniFocus + Session";
diff --git a/Session.omnifocusjs/Resources/en.lproj/start.strings b/Session.omnifocusjs/Resources/en.lproj/start.strings
new file mode 100644
index 0000000..9abb177
--- /dev/null
+++ b/Session.omnifocusjs/Resources/en.lproj/start.strings
@@ -0,0 +1,5 @@
+"label" = "Start a session";
+"shortLabel" = "Start";
+"mediumLabel" = "Start";
+"longLabel" = "Start a session";
+"paletteLabel" = "Start";
diff --git a/Session.omnifocusjs/Resources/start.js b/Session.omnifocusjs/Resources/start.js
new file mode 100644
index 0000000..08375ee
--- /dev/null
+++ b/Session.omnifocusjs/Resources/start.js
@@ -0,0 +1,84 @@
+"use strict";
+/*
+WARNING: if you're looking at the file ending in .js and want to make changes,
+don't! Modify the .ts file and run `tsc` instead!
+*/
+(() => {
+    function findCategory(tag) {
+        if (tag.name == "Wandering Toolmaker") {
+            return tag.name;
+        }
+        else if (tag.name == "teams" ||
+            (tag.parent && tag.parent.name == "teams") ||
+            tag.name == "work" ||
+            (tag.parent && tag.parent.name == "work")) {
+            return "Team";
+        }
+        else if (tag.name == "personal" ||
+            (tag.parent && tag.parent.name == "personal")) {
+            return "Personal";
+        }
+        return null;
+    }
+    var action = new PlugIn.Action(async (selection, sender) => {
+        try {
+            let possibleCategories = ["Personal", "Team", "Wandering Toolmaker"];
+            let defaultCategory = possibleCategories[0];
+            let defaultProject = null;
+            let defaultMinutes = "25";
+            if (selection.tasks[0]) {
+                let task = selection.tasks[0];
+                for (let tag of task.tags) {
+                    let category = findCategory(tag);
+                    if (category !== null) {
+                        defaultCategory = category;
+                        break;
+                    }
+                }
+                if (task.containingProject) {
+                    defaultProject = task.containingProject.name;
+                }
+            }
+            else if (selection.tags[0]) {
+                let tag = selection.tags[0];
+                defaultProject = tag.name;
+                let category = findCategory(tag);
+                if (category !== null) {
+                    defaultCategory = category;
+                }
+            }
+            else if (selection.projects[0]) {
+                let project = selection.projects[0];
+                defaultProject = project.name;
+                for (let tag of project.tags) {
+                    let category = findCategory(tag);
+                    if (category !== null) {
+                        defaultCategory = category;
+                        break;
+                    }
+                }
+            }
+            let focusForm = new Form();
+            focusForm.addField(new Form.Field.String("project", "Project", defaultProject));
+            focusForm.addField(new Form.Field.Option("category", "Category", possibleCategories, possibleCategories, defaultCategory));
+            focusForm.addField(new Form.Field.String("minutes", "Minutes", defaultMinutes));
+            await focusForm.show("Focus on…", "Start");
+            let values = focusForm.values;
+            let rawSessionUrl = `session:///start?intent=${encodeURIComponent(values.project)}&categoryName=${encodeURIComponent(values.category)}&duration=${encodeURIComponent(values.minutes)}`;
+            let sessionUrl = URL.fromString(rawSessionUrl);
+            if (sessionUrl === null) {
+                throw `failed to parse session string ("${rawSessionUrl}") into a URL`;
+            }
+            sessionUrl.open();
+        }
+        catch (err) {
+            console.error(err);
+        }
+    });
+    action.validate = function (selection, sender) {
+        return (selection.tasks.length === 1 ||
+            selection.tags.length === 1 ||
+            selection.projects.length === 1);
+    };
+    return action;
+})();
diff --git a/Session.omnifocusjs/Resources/start.ts b/Session.omnifocusjs/Resources/start.ts
new file mode 100644
index 0000000..3aadfce
--- /dev/null
+++ b/Session.omnifocusjs/Resources/start.ts
@@ -0,0 +1,118 @@
+/*
+WARNING: if you're looking at the file ending in .js and want to make changes,
+don't! Modify the .ts file and run `tsc` instead!
+*/
+(() => {
+  function findCategory(tag: Tag): string | null {
+    if (tag.name == "Wandering Toolmaker") {
+      return tag.name;
+    } else if (
+      tag.name == "teams" ||
+      (tag.parent && tag.parent.name == "teams") ||
+      tag.name == "work" ||
+      (tag.parent && tag.parent.name == "work")
+    ) {
+      return "Team";
+    } else if (
+      tag.name == "personal" ||
+      (tag.parent && tag.parent.name == "personal")
+    ) {
+      return "Personal";
+    }
+
+    return null;
+  }
+
+  var action = new PlugIn.Action(async (selection: Selection, sender: any) => {
+    try {
+      let possibleCategories = ["Personal", "Team", "Wandering Toolmaker"];
+      let defaultCategory: string = possibleCategories[0];
+      let defaultProject: string | null = null;
+      let defaultMinutes: string = "25";
+
+      if (selection.tasks[0]) {
+        let task = selection.tasks[0];
+
+        for (let tag of task.tags) {
+          let category = findCategory(tag);
+          if (category !== null) {
+            defaultCategory = category;
+            break;
+          }
+        }
+
+        if (task.containingProject) {
+          defaultProject = task.containingProject.name;
+        }
+      } else if (selection.tags[0]) {
+        let tag = selection.tags[0];
+
+        defaultProject = tag.name;
+
+        let category = findCategory(tag);
+        if (category !== null) {
+          defaultCategory = category;
+        }
+      } else if (selection.projects[0]) {
+        let project = selection.projects[0];
+
+        defaultProject = project.name;
+
+        for (let tag of project.tags) {
+          let category = findCategory(tag);
+          if (category !== null) {
+            defaultCategory = category;
+            break;
+          }
+        }
+      }
+
+      let focusForm = new Form();
+      focusForm.addField(
+        new Form.Field.String("project", "Project", defaultProject)
+      );
+      focusForm.addField(
+        new Form.Field.Option(
+          "category",
+          "Category",
+          possibleCategories,
+          possibleCategories,
+          defaultCategory
+        )
+      );
+      focusForm.addField(
+        new Form.Field.String("minutes", "Minutes", defaultMinutes)
+      );
+
+      await focusForm.show("Focus on…", "Start");
+      let values = focusForm.values as {
+        project: string;
+        category: string;
+        minutes: string;
+      };
+
+      let rawSessionUrl = `session:///start?intent=${encodeURIComponent(
+        values.project
+      )}&categoryName=${encodeURIComponent(
+        values.category
+      )}&duration=${encodeURIComponent(values.minutes)}`;
+      let sessionUrl = URL.fromString(rawSessionUrl);
+      if (sessionUrl === null) {
+        throw `failed to parse session string ("${rawSessionUrl}") into a URL`;
+      }
+      sessionUrl.open();
+    } catch (err) {
+      console.error(err);
+    }
+  });
+
+  action.validate = function (selection: Selection, sender: any) {
+    return (
+      selection.tasks.length === 1 ||
+      selection.tags.length === 1 ||
+      selection.projects.length === 1
+    );
+  };
+
+  return action;
+})();
diff --git a/Session.omnifocusjs/manifest.json b/Session.omnifocusjs/manifest.json
new file mode 100644
index 0000000..56343d0
--- /dev/null
+++ b/Session.omnifocusjs/manifest.json
@@ -0,0 +1,13 @@
+{
+  "author": "Brian Hicks",
+  "identifier": "zone.bytes.session",
+  "defaultLocale": "en",
+  "version": "1.0",
+  "description": "Start tasks in Session (https://www.stayinsession.com/)",
+  "actions": [
+    {
+      "image": "clock",
+      "identifier": "start"
+    }
+  ]
+}