chore: restore default comment on lookaheadHours

Co-authored-by: Ona <no-reply@ona.com>
refactor: move source options into source file
2026-03-20 17:11:17 +00:00 · 2026-02-14 15:43:00 +00:00 · 2026-02-14 15:42:59 +00:00 · 2026-02-14 15:42:59 +00:00 · 2026-02-14 15:42:59 +00:00 · 2026-02-14 15:42:04 +00:00
15 changed files with 991 additions and 105 deletions
--- a/bun.lock
+++ b/bun.lock
@@ -53,6 +53,14 @@
        "tsdav": "^2.1.7",
      },
    },
+    "packages/aris-source-google-calendar": {
+      "name": "@aris/source-google-calendar",
+      "version": "0.0.0",
+      "dependencies": {
+        "@aris/core": "workspace:*",
+        "arktype": "^2.1.0",
+      },
+    },
    "packages/aris-source-location": {
      "name": "@aris/source-location",
      "version": "0.0.0",
@@ -88,6 +96,8 @@

    "@aris/source-apple-calendar": ["@aris/source-apple-calendar@workspace:packages/aris-source-apple-calendar"],

+    "@aris/source-google-calendar": ["@aris/source-google-calendar@workspace:packages/aris-source-google-calendar"],
+
    "@aris/source-location": ["@aris/source-location@workspace:packages/aris-source-location"],

    "@aris/source-tfl": ["@aris/source-tfl@workspace:packages/aris-source-tfl"],
@@ -98,9 +108,9 @@

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-    "@better-auth/core": ["@better-auth/core@1.4.17", "", { "dependencies": { "@standard-schema/spec": "^1.0.0", "zod": "^4.3.5" }, "peerDependencies": { "@better-auth/utils": "0.3.0", "@better-fetch/fetch": "1.1.21", "better-call": "1.1.8", "jose": "^6.1.0", "kysely": "^0.28.5", "nanostores": "^1.0.1" } }, "sha512-WSaEQDdUO6B1CzAmissN6j0lx9fM9lcslEYzlApB5UzFaBeAOHNUONTdglSyUs6/idiZBoRvt0t/qMXCgIU8ug=="],
+    "@better-auth/core": ["@better-auth/core@1.4.18", "", { "dependencies": { "@standard-schema/spec": "^1.0.0", "zod": "^4.3.5" }, "peerDependencies": { "@better-auth/utils": "0.3.0", "@better-fetch/fetch": "1.1.21", "better-call": "1.1.8", "jose": "^6.1.0", "kysely": "^0.28.5", "nanostores": "^1.0.1" } }, "sha512-q+awYgC7nkLEBdx2sW0iJjkzgSHlIxGnOpsN1r/O1+a4m7osJNHtfK2mKJSL1I+GfNyIlxJF8WvD/NLuYMpmcg=="],

-    "@better-auth/telemetry": ["@better-auth/telemetry@1.4.17", "", { "dependencies": { "@better-auth/utils": "0.3.0", "@better-fetch/fetch": "1.1.21" }, "peerDependencies": { "@better-auth/core": "1.4.17" } }, "sha512-R1BC4e/bNjQbXu7lG6ubpgmsPj7IMqky5DvMlzAtnAJWJhh99pMh/n6w5gOHa0cqDZgEAuj75IPTxv+q3YiInA=="],
+    "@better-auth/telemetry": ["@better-auth/telemetry@1.4.18", "", { "dependencies": { "@better-auth/utils": "0.3.0", "@better-fetch/fetch": "1.1.21" }, "peerDependencies": { "@better-auth/core": "1.4.18" } }, "sha512-e5rDF8S4j3Um/0LIVATL2in9dL4lfO2fr2v1Wio4qTMRbfxqnUDTa+6SZtwdeJrbc4O+a3c+IyIpjG9Q/6GpfQ=="],

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@@ -128,29 +138,51 @@

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+    "@oxlint/binding-android-arm-eabi": ["@oxlint/binding-android-arm-eabi@1.47.0", "", { "os": "android", "cpu": "arm" }, "sha512-UHqo3te9K/fh29brCuQdHjN+kfpIi9cnTPABuD5S9wb9ykXYRGTOOMVuSV/CK43sOhU4wwb2nT1RVjcbrrQjFw=="],

-    "@oxlint/darwin-x64": ["@oxlint/darwin-x64@1.39.0", "", { "os": "darwin", "cpu": "x64" }, "sha512-UT+rfTWd+Yr7iJeSLd/7nF8X4gTYssKh+n77hxl6Oilp3NnG1CKRHxZDy3o3lIBnwgzJkdyUAiYWO1bTMXQ1lA=="],
+    "@oxlint/binding-android-arm64": ["@oxlint/binding-android-arm64@1.47.0", "", { "os": "android", "cpu": "arm64" }, "sha512-xh02lsTF1TAkR+SZrRMYHR/xCx8Wg2MAHxJNdHVpAKELh9/yE9h4LJeqAOBbIb3YYn8o/D97U9VmkvkfJfrHfw=="],

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@@ -160,11 +192,11 @@

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@@ -172,13 +204,13 @@

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-    "hono": ["hono@4.11.5", "", {}, "sha512-WemPi9/WfyMwZs+ZUXdiwcCh9Y+m7L+8vki9MzDw3jJ+W9Lc+12HGsd368Qc1vZi1xwW8BWMMsnK5efYKPdt4g=="],
+    "hono": ["hono@4.11.9", "", {}, "sha512-Eaw2YTGM6WOxA6CXbckaEvslr2Ne4NFsKrvc0v97JD5awbmeBLO5w9Ho9L9kmKonrwF9RJlW6BxT1PVv/agBHQ=="],

    "ical.js": ["ical.js@2.2.1", "", {}, "sha512-yK/UlPbEs316igb/tjRgbFA8ZV75rCsBJp/hWOatpyaPNlgw0dGDmU+FoicOcwX4xXkeXOkYiOmCqNPFpNPkQg=="],

    "jose": ["jose@6.1.3", "", {}, "sha512-0TpaTfihd4QMNwrz/ob2Bp7X04yuxJkjRGi4aKmOqwhov54i6u79oCv7T+C7lo70MKH6BesI3vscD1yb/yzKXQ=="],

-    "kysely": ["kysely@0.28.10", "", {}, "sha512-ksNxfzIW77OcZ+QWSAPC7yDqUSaIVwkTWnTPNiIy//vifNbwsSgQ57OkkncHxxpcBHM3LRfLAZVEh7kjq5twVA=="],
+    "kysely": ["kysely@0.28.11", "", {}, "sha512-zpGIFg0HuoC893rIjYX1BETkVWdDnzTzF5e0kWXJFg5lE0k1/LfNWBejrcnOFu8Q2Rfq/hTDTU7XLUM8QOrpzg=="],

    "ms": ["ms@2.1.3", "", {}, "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA=="],

@@ -188,13 +220,13 @@

    "oxfmt": ["oxfmt@0.24.0", "", { "dependencies": { "tinypool": "2.0.0" }, "optionalDependencies": { "@oxfmt/darwin-arm64": "0.24.0", "@oxfmt/darwin-x64": "0.24.0", "@oxfmt/linux-arm64-gnu": "0.24.0", "@oxfmt/linux-arm64-musl": "0.24.0", "@oxfmt/linux-x64-gnu": "0.24.0", "@oxfmt/linux-x64-musl": "0.24.0", "@oxfmt/win32-arm64": "0.24.0", "@oxfmt/win32-x64": "0.24.0" }, "bin": { "oxfmt": "bin/oxfmt" } }, "sha512-UjeM3Peez8Tl7IJ9s5UwAoZSiDRMww7BEc21gDYxLq3S3/KqJnM3mjNxsoSHgmBvSeX6RBhoVc2MfC/+96RdSw=="],

-    "oxlint": ["oxlint@1.39.0", "", { "optionalDependencies": { "@oxlint/darwin-arm64": "1.39.0", "@oxlint/darwin-x64": "1.39.0", "@oxlint/linux-arm64-gnu": "1.39.0", "@oxlint/linux-arm64-musl": "1.39.0", "@oxlint/linux-x64-gnu": "1.39.0", "@oxlint/linux-x64-musl": "1.39.0", "@oxlint/win32-arm64": "1.39.0", "@oxlint/win32-x64": "1.39.0" }, "peerDependencies": { "oxlint-tsgolint": ">=0.10.0" }, "optionalPeers": ["oxlint-tsgolint"], "bin": { "oxlint": "bin/oxlint" } }, "sha512-wSiLr0wjG+KTU6c1LpVoQk7JZ7l8HCKlAkVDVTJKWmCGazsNxexxnOXl7dsar92mQcRnzko5g077ggP3RINSjA=="],
+    "oxlint": ["oxlint@1.47.0", "", { "optionalDependencies": { "@oxlint/binding-android-arm-eabi": "1.47.0", "@oxlint/binding-android-arm64": "1.47.0", "@oxlint/binding-darwin-arm64": "1.47.0", "@oxlint/binding-darwin-x64": "1.47.0", "@oxlint/binding-freebsd-x64": "1.47.0", "@oxlint/binding-linux-arm-gnueabihf": "1.47.0", "@oxlint/binding-linux-arm-musleabihf": "1.47.0", "@oxlint/binding-linux-arm64-gnu": "1.47.0", "@oxlint/binding-linux-arm64-musl": "1.47.0", "@oxlint/binding-linux-ppc64-gnu": "1.47.0", "@oxlint/binding-linux-riscv64-gnu": "1.47.0", "@oxlint/binding-linux-riscv64-musl": "1.47.0", "@oxlint/binding-linux-s390x-gnu": "1.47.0", "@oxlint/binding-linux-x64-gnu": "1.47.0", "@oxlint/binding-linux-x64-musl": "1.47.0", "@oxlint/binding-openharmony-arm64": "1.47.0", "@oxlint/binding-win32-arm64-msvc": "1.47.0", "@oxlint/binding-win32-ia32-msvc": "1.47.0", "@oxlint/binding-win32-x64-msvc": "1.47.0" }, "peerDependencies": { "oxlint-tsgolint": ">=0.11.2" }, "optionalPeers": ["oxlint-tsgolint"], "bin": { "oxlint": "bin/oxlint" } }, "sha512-v7xkK1iv1qdvTxJGclM97QzN8hHs5816AneFAQ0NGji1BMUquhiDAhXpMwp8+ls16uRVJtzVHxP9pAAXblDeGA=="],

-    "pg": ["pg@8.17.2", "", { "dependencies": { "pg-connection-string": "^2.10.1", "pg-pool": "^3.11.0", "pg-protocol": "^1.11.0", "pg-types": "2.2.0", "pgpass": "1.0.5" }, "optionalDependencies": { "pg-cloudflare": "^1.3.0" }, "peerDependencies": { "pg-native": ">=3.0.1" }, "optionalPeers": ["pg-native"] }, "sha512-vjbKdiBJRqzcYw1fNU5KuHyYvdJ1qpcQg1CeBrHFqV1pWgHeVR6j/+kX0E1AAXfyuLUGY1ICrN2ELKA/z2HWzw=="],
+    "pg": ["pg@8.18.0", "", { "dependencies": { "pg-connection-string": "^2.11.0", "pg-pool": "^3.11.0", "pg-protocol": "^1.11.0", "pg-types": "2.2.0", "pgpass": "1.0.5" }, "optionalDependencies": { "pg-cloudflare": "^1.3.0" }, "peerDependencies": { "pg-native": ">=3.0.1" }, "optionalPeers": ["pg-native"] }, "sha512-xqrUDL1b9MbkydY/s+VZ6v+xiMUmOUk7SS9d/1kpyQxoJ6U9AO1oIJyUWVZojbfe5Cc/oluutcgFG4L9RDP1iQ=="],

    "pg-cloudflare": ["pg-cloudflare@1.3.0", "", {}, "sha512-6lswVVSztmHiRtD6I8hw4qP/nDm1EJbKMRhf3HCYaqud7frGysPv7FYJ5noZQdhQtN2xJnimfMtvQq21pdbzyQ=="],

-    "pg-connection-string": ["pg-connection-string@2.10.1", "", {}, "sha512-iNzslsoeSH2/gmDDKiyMqF64DATUCWj3YJ0wP14kqcsf2TUklwimd+66yYojKwZCA7h2yRNLGug71hCBA2a4sw=="],
+    "pg-connection-string": ["pg-connection-string@2.11.0", "", {}, "sha512-kecgoJwhOpxYU21rZjULrmrBJ698U2RxXofKVzOn5UDj61BPj/qMb7diYUR1nLScCDbrztQFl1TaQZT0t1EtzQ=="],

    "pg-int8": ["pg-int8@1.0.1", "", {}, "sha512-WCtabS6t3c8SkpDBUlb1kjOs7l66xsGdKpIPZsg4wR+B3+u9UAum2odSsF9tnvxg80h4ZxLWMy4pRjOsFIqQpw=="],

@@ -226,7 +258,7 @@

    "tr46": ["tr46@0.0.3", "", {}, "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw=="],

-    "tsdav": ["tsdav@2.1.7", "", { "dependencies": { "base-64": "1.0.0", "cross-fetch": "4.1.0", "debug": "4.4.3", "xml-js": "1.6.11" } }, "sha512-/qjLC9iMox/ntV9L1YkGws9Q6sQ3JknYYSgB0sbq6fH7bqrx9pa9Y3CcTC+q8lnY6v5dud3Un/zsnGvyngh4Xg=="],
+    "tsdav": ["tsdav@2.1.8", "", { "dependencies": { "base-64": "1.0.0", "cross-fetch": "4.1.0", "debug": "4.4.3", "xml-js": "1.6.11" } }, "sha512-zvQvhZLzTaEmNNgJbBlUYT/JOq9Xpw/xkxCqs7IT2d2/7o7pss0iZOlZXuHJ5VcvSvTny42Vc6+6GyzZcrCJ1g=="],

    "typescript": ["typescript@5.9.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw=="],

--- a/packages/aris-source-apple-calendar/src/calendar-source.test.ts
+++ b/packages/aris-source-apple-calendar/src/calendar-source.test.ts
@@ -48,12 +48,13 @@ class MockCredentialProvider implements CalendarCredentialProvider {

 class MockDAVClient implements CalendarDAVClient {
 	credentials: Record<string, unknown> = {}
+	fetchCalendarsCallCount = 0
 	private calendars: CalendarDAVCalendar[]
-	private objectsByCalendarUrl: Map<string, CalendarDAVObject[]>
+	private objectsByCalendarUrl: Record<string, CalendarDAVObject[]>

 	constructor(
 		calendars: CalendarDAVCalendar[],
-		objectsByCalendarUrl: Map<string, CalendarDAVObject[]>,
+		objectsByCalendarUrl: Record<string, CalendarDAVObject[]>,
 	) {
 		this.calendars = calendars
 		this.objectsByCalendarUrl = objectsByCalendarUrl
@@ -62,6 +63,7 @@ class MockDAVClient implements CalendarDAVClient {
 	async login(): Promise<void> {}

 	async fetchCalendars(): Promise<CalendarDAVCalendar[]> {
+		this.fetchCalendarsCallCount++
 		return this.calendars
 	}

@@ -69,7 +71,7 @@ class MockDAVClient implements CalendarDAVClient {
 		calendar: CalendarDAVCalendar
 		timeRange: { start: string; end: string }
 	}): Promise<CalendarDAVObject[]> {
-		return this.objectsByCalendarUrl.get(params.calendar.url) ?? []
+		return this.objectsByCalendarUrl[params.calendar.url] ?? []
 	}
 }

@@ -86,7 +88,7 @@ describe("CalendarSource", () => {
 	})

 	test("returns empty array when no calendars exist", async () => {
-		const client = new MockDAVClient([], new Map())
+		const client = new MockDAVClient([], {})
 		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
 			davClient: client,
 		})
@@ -95,9 +97,9 @@ describe("CalendarSource", () => {
 	})

 	test("returns feed items from a single calendar", async () => {
-		const objects = new Map<string, CalendarDAVObject[]>([
-			["/cal/work", [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }]],
-		])
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }],
+		}
 		const client = new MockDAVClient([{ url: "/cal/work", displayName: "Work" }], objects)
 		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
 			davClient: client,
@@ -116,13 +118,12 @@ describe("CalendarSource", () => {
 	})

 	test("returns feed items from multiple calendars", async () => {
-		const objects = new Map<string, CalendarDAVObject[]>([
-			["/cal/work", [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }]],
-			[
-				"/cal/personal",
-				[{ url: "/cal/personal/event2.ics", data: loadFixture("all-day-event.ics") }],
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }],
+			"/cal/personal": [
+				{ url: "/cal/personal/event2.ics", data: loadFixture("all-day-event.ics") },
 			],
-		])
+		}
 		const client = new MockDAVClient(
 			[
 				{ url: "/cal/work", displayName: "Work" },
@@ -150,16 +151,13 @@ describe("CalendarSource", () => {
 	})

 	test("skips objects with non-string data", async () => {
-		const objects = new Map<string, CalendarDAVObject[]>([
-			[
-				"/cal/work",
-				[
-					{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") },
-					{ url: "/cal/work/bad.ics", data: 12345 },
-					{ url: "/cal/work/empty.ics" },
-				],
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [
+				{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") },
+				{ url: "/cal/work/bad.ics", data: 12345 },
+				{ url: "/cal/work/empty.ics" },
 			],
-		])
+		}
 		const client = new MockDAVClient([{ url: "/cal/work", displayName: "Work" }], objects)
 		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
 			davClient: client,
@@ -171,9 +169,9 @@ describe("CalendarSource", () => {
 	})

 	test("uses context time as feed item timestamp", async () => {
-		const objects = new Map<string, CalendarDAVObject[]>([
-			["/cal/work", [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }]],
-		])
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }],
+		}
 		const client = new MockDAVClient([{ url: "/cal/work", displayName: "Work" }], objects)
 		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
 			davClient: client,
@@ -185,15 +183,12 @@ describe("CalendarSource", () => {
 	})

 	test("assigns priority based on event proximity", async () => {
-		const objects = new Map<string, CalendarDAVObject[]>([
-			[
-				"/cal/work",
-				[
-					{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") },
-					{ url: "/cal/work/allday.ics", data: loadFixture("all-day-event.ics") },
-				],
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [
+				{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") },
+				{ url: "/cal/work/allday.ics", data: loadFixture("all-day-event.ics") },
 			],
-		])
+		}
 		const client = new MockDAVClient([{ url: "/cal/work", displayName: "Work" }], objects)
 		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
 			davClient: client,
@@ -210,9 +205,9 @@ describe("CalendarSource", () => {
 	})

 	test("handles calendar with non-string displayName", async () => {
-		const objects = new Map<string, CalendarDAVObject[]>([
-			["/cal/weird", [{ url: "/cal/weird/event1.ics", data: loadFixture("minimal-event.ics") }]],
-		])
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/weird": [{ url: "/cal/weird/event1.ics", data: loadFixture("minimal-event.ics") }],
+		}
 		const client = new MockDAVClient(
 			[{ url: "/cal/weird", displayName: { _cdata: "Weird Calendar" } }],
 			objects,
@@ -226,9 +221,9 @@ describe("CalendarSource", () => {
 	})

 	test("handles recurring events with exceptions", async () => {
-		const objects = new Map<string, CalendarDAVObject[]>([
-			["/cal/work", [{ url: "/cal/work/recurring.ics", data: loadFixture("recurring-event.ics") }]],
-		])
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [{ url: "/cal/work/recurring.ics", data: loadFixture("recurring-event.ics") }],
+		}
 		const client = new MockDAVClient([{ url: "/cal/work", displayName: "Work" }], objects)
 		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
 			davClient: client,
@@ -248,6 +243,40 @@ describe("CalendarSource", () => {
 		expect(exception!.data.recurrenceId).not.toBeNull()
 		expect(exception!.id).toContain("-")
 	})
+
+	test("caches events within the same refresh cycle", async () => {
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }],
+		}
+		const client = new MockDAVClient([{ url: "/cal/work", displayName: "Work" }], objects)
+		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
+			davClient: client,
+		})
+
+		const context = createContext(new Date("2026-01-15T12:00:00Z"))
+
+		await source.fetchContext(context)
+		await source.fetchItems(context)
+
+		// Same context.time reference — fetchEvents should only hit the client once
+		expect(client.fetchCalendarsCallCount).toBe(1)
+	})
+
+	test("refetches events for a different context time", async () => {
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }],
+		}
+		const client = new MockDAVClient([{ url: "/cal/work", displayName: "Work" }], objects)
+		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
+			davClient: client,
+		})
+
+		await source.fetchItems(createContext(new Date("2026-01-15T12:00:00Z")))
+		await source.fetchItems(createContext(new Date("2026-01-15T13:00:00Z")))
+
+		// Different context.time references — should fetch twice
+		expect(client.fetchCalendarsCallCount).toBe(2)
+	})
 })

 describe("CalendarSource.fetchContext", () => {
@@ -264,9 +293,9 @@ describe("CalendarSource.fetchContext", () => {
 	})

 	test("identifies in-progress events", async () => {
-		const objects = new Map<string, CalendarDAVObject[]>([
-			["/cal/work", [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }]],
-		])
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }],
+		}
 		const client = new MockDAVClient([{ url: "/cal/work", displayName: "Work" }], objects)
 		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
 			davClient: client,
@@ -281,9 +310,9 @@ describe("CalendarSource.fetchContext", () => {
 	})

 	test("identifies next upcoming event", async () => {
-		const objects = new Map<string, CalendarDAVObject[]>([
-			["/cal/work", [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }]],
-		])
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") }],
+		}
 		const client = new MockDAVClient([{ url: "/cal/work", displayName: "Work" }], objects)
 		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
 			davClient: client,
@@ -299,9 +328,9 @@ describe("CalendarSource.fetchContext", () => {
 	})

 	test("excludes all-day events from inProgress and nextEvent", async () => {
-		const objects = new Map<string, CalendarDAVObject[]>([
-			["/cal/work", [{ url: "/cal/work/allday.ics", data: loadFixture("all-day-event.ics") }]],
-		])
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [{ url: "/cal/work/allday.ics", data: loadFixture("all-day-event.ics") }],
+		}
 		const client = new MockDAVClient([{ url: "/cal/work", displayName: "Work" }], objects)
 		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
 			davClient: client,
@@ -317,15 +346,12 @@ describe("CalendarSource.fetchContext", () => {
 	})

 	test("counts all events including all-day in todayEventCount", async () => {
-		const objects = new Map<string, CalendarDAVObject[]>([
-			[
-				"/cal/work",
-				[
-					{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") },
-					{ url: "/cal/work/allday.ics", data: loadFixture("all-day-event.ics") },
-				],
+		const objects: Record<string, CalendarDAVObject[]> = {
+			"/cal/work": [
+				{ url: "/cal/work/event1.ics", data: loadFixture("single-event.ics") },
+				{ url: "/cal/work/allday.ics", data: loadFixture("all-day-event.ics") },
 			],
-		])
+		}
 		const client = new MockDAVClient([{ url: "/cal/work", displayName: "Work" }], objects)
 		const source = new CalendarSource(new MockCredentialProvider(), "user-1", {
 			davClient: client,
--- a/packages/aris-source-apple-calendar/src/calendar-source.ts
+++ b/packages/aris-source-apple-calendar/src/calendar-source.ts
@@ -8,9 +8,15 @@ import type {
 	CalendarDAVClient,
 	CalendarEventData,
 	CalendarFeedItem,
-	CalendarSourceOptions,
 } from "./types.ts"

+export interface CalendarSourceOptions {
+	/** Number of additional days beyond today to fetch. Default: 0 (today only). */
+	lookAheadDays?: number
+	/** Optional DAVClient instance for testing. Uses tsdav DAVClient by default. */
+	davClient?: CalendarDAVClient
+}
+
 import { CalendarKey, type CalendarContext } from "./calendar-context.ts"
 import { parseICalEvents } from "./ical-parser.ts"

@@ -39,6 +45,7 @@ export class CalendarSource implements FeedSource<CalendarFeedItem> {
 	private readonly injectedClient: CalendarDAVClient | null
 	private davClient: CalendarDAVClient | null = null
 	private lastAccessToken: string | null = null
+	private cachedEvents: { time: Date; events: CalendarEventData[] } | null = null

 	constructor(
 		credentialProvider: CalendarCredentialProvider,
@@ -88,6 +95,10 @@ export class CalendarSource implements FeedSource<CalendarFeedItem> {
 	}

 	private async fetchEvents(context: Context): Promise<CalendarEventData[]> {
+		if (this.cachedEvents && this.cachedEvents.time === context.time) {
+			return this.cachedEvents.events
+		}
+
 		const credentials = await this.credentialProvider.fetchCredentials(this.userId)
 		if (!credentials) {
 			return []
@@ -128,6 +139,7 @@ export class CalendarSource implements FeedSource<CalendarFeedItem> {
 			}
 		}

+		this.cachedEvents = { time: context.time, events: allEvents }
 		return allEvents
 	}

--- a/packages/aris-source-apple-calendar/src/ical-parser.ts
+++ b/packages/aris-source-apple-calendar/src/ical-parser.ts
@@ -52,11 +52,16 @@ function parseVEvent(

 function parseStatus(raw: string | null): CalendarEventStatus | null {
 	if (!raw) return null
-	const lower = raw.toLowerCase()
-	if (lower === "confirmed") return CalendarEventStatus.Confirmed
-	if (lower === "tentative") return CalendarEventStatus.Tentative
-	if (lower === "cancelled") return CalendarEventStatus.Cancelled
-	return null
+	switch (raw.toLowerCase()) {
+		case "confirmed":
+			return CalendarEventStatus.Confirmed
+		case "tentative":
+			return CalendarEventStatus.Tentative
+		case "cancelled":
+			return CalendarEventStatus.Cancelled
+		default:
+			return null
+	}
 }

 function parseOrganizer(
@@ -97,21 +102,32 @@ function parseAttendees(properties: unknown[]): CalendarAttendee[] {

 function parseAttendeeRole(raw: string | null): AttendeeRole | null {
 	if (!raw) return null
-	const upper = raw.toUpperCase()
-	if (upper === "CHAIR") return AttendeeRole.Chair
-	if (upper === "REQ-PARTICIPANT") return AttendeeRole.Required
-	if (upper === "OPT-PARTICIPANT") return AttendeeRole.Optional
-	return null
+	switch (raw.toUpperCase()) {
+		case "CHAIR":
+			return AttendeeRole.Chair
+		case "REQ-PARTICIPANT":
+			return AttendeeRole.Required
+		case "OPT-PARTICIPANT":
+			return AttendeeRole.Optional
+		default:
+			return null
+	}
 }

 function parseAttendeeStatus(raw: string | null): AttendeeStatus | null {
 	if (!raw) return null
-	const upper = raw.toUpperCase()
-	if (upper === "ACCEPTED") return AttendeeStatus.Accepted
-	if (upper === "DECLINED") return AttendeeStatus.Declined
-	if (upper === "TENTATIVE") return AttendeeStatus.Tentative
-	if (upper === "NEEDS-ACTION") return AttendeeStatus.NeedsAction
-	return null
+	switch (raw.toUpperCase()) {
+		case "ACCEPTED":
+			return AttendeeStatus.Accepted
+		case "DECLINED":
+			return AttendeeStatus.Declined
+		case "TENTATIVE":
+			return AttendeeStatus.Tentative
+		case "NEEDS-ACTION":
+			return AttendeeStatus.NeedsAction
+		default:
+			return null
+	}
 }

 function parseAlarms(vevent: InstanceType<typeof ICAL.Component>): CalendarAlarm[] {
--- a/packages/aris-source-apple-calendar/src/index.ts
+++ b/packages/aris-source-apple-calendar/src/index.ts
@@ -1,5 +1,5 @@
 export { CalendarKey, type CalendarContext } from "./calendar-context.ts"
-export { CalendarSource } from "./calendar-source.ts"
+export { CalendarSource, type CalendarSourceOptions } from "./calendar-source.ts"
 export {
 	CalendarEventStatus,
 	AttendeeRole,
@@ -13,5 +13,4 @@ export {
 	type CalendarAlarm,
 	type CalendarEventData,
 	type CalendarFeedItem,
-	type CalendarSourceOptions,
 } from "./types.ts"
--- a/packages/aris-source-apple-calendar/src/types.ts
+++ b/packages/aris-source-apple-calendar/src/types.ts
@@ -99,12 +99,3 @@ export interface CalendarDAVClient {
 	}): Promise<CalendarDAVObject[]>
 	credentials: Record<string, unknown>
 }
-
-// -- Source options --
-
-export interface CalendarSourceOptions {
-	/** Number of additional days beyond today to fetch. Default: 0 (today only). */
-	lookAheadDays?: number
-	/** Optional DAVClient instance for testing. Uses tsdav DAVClient by default. */
-	davClient?: CalendarDAVClient
-}
--- a/packages/aris-source-google-calendar/fixtures/events.json
+++ b/packages/aris-source-google-calendar/fixtures/events.json
@@ -0,0 +1,72 @@
+{
+	"kind": "calendar#events",
+	"summary": "primary",
+	"items": [
+		{
+			"id": "evt-ongoing",
+			"status": "confirmed",
+			"htmlLink": "https://calendar.google.com/event?eid=evt-ongoing",
+			"summary": "Team Standup",
+			"description": "Daily standup meeting",
+			"location": "Room 3A",
+			"start": {
+				"dateTime": "2026-01-20T09:30:00Z"
+			},
+			"end": {
+				"dateTime": "2026-01-20T10:15:00Z"
+			}
+		},
+		{
+			"id": "evt-soon",
+			"status": "confirmed",
+			"htmlLink": "https://calendar.google.com/event?eid=evt-soon",
+			"summary": "1:1 with Manager",
+			"start": {
+				"dateTime": "2026-01-20T10:10:00Z"
+			},
+			"end": {
+				"dateTime": "2026-01-20T10:40:00Z"
+			}
+		},
+		{
+			"id": "evt-later",
+			"status": "confirmed",
+			"htmlLink": "https://calendar.google.com/event?eid=evt-later",
+			"summary": "Design Review",
+			"description": "Review new dashboard designs",
+			"location": "Conference Room B",
+			"start": {
+				"dateTime": "2026-01-20T14:00:00Z"
+			},
+			"end": {
+				"dateTime": "2026-01-20T15:00:00Z"
+			}
+		},
+		{
+			"id": "evt-tentative",
+			"status": "tentative",
+			"htmlLink": "https://calendar.google.com/event?eid=evt-tentative",
+			"summary": "Lunch with Alex",
+			"location": "Cafe Nero",
+			"start": {
+				"dateTime": "2026-01-20T12:00:00Z"
+			},
+			"end": {
+				"dateTime": "2026-01-20T13:00:00Z"
+			}
+		},
+		{
+			"id": "evt-allday",
+			"status": "confirmed",
+			"htmlLink": "https://calendar.google.com/event?eid=evt-allday",
+			"summary": "Company Holiday",
+			"description": "Office closed",
+			"start": {
+				"date": "2026-01-20"
+			},
+			"end": {
+				"date": "2026-01-21"
+			}
+		}
+	]
+}
--- a/packages/aris-source-google-calendar/package.json
+++ b/packages/aris-source-google-calendar/package.json
@@ -0,0 +1,14 @@
+{
+	"name": "@aris/source-google-calendar",
+	"version": "0.0.0",
+	"type": "module",
+	"main": "src/index.ts",
+	"types": "src/index.ts",
+	"scripts": {
+		"test": "bun test ."
+	},
+	"dependencies": {
+		"@aris/core": "workspace:*",
+		"arktype": "^2.1.0"
+	}
+}
--- a/packages/aris-source-google-calendar/src/calendar-context.ts
+++ b/packages/aris-source-google-calendar/src/calendar-context.ts
@@ -0,0 +1,13 @@
+import type { ContextKey } from "@aris/core"
+
+import { contextKey } from "@aris/core"
+
+export interface NextEvent {
+	title: string
+	startTime: Date
+	endTime: Date
+	minutesUntilStart: number
+	location: string | null
+}
+
+export const NextEventKey: ContextKey<NextEvent> = contextKey("nextEvent")
--- a/packages/aris-source-google-calendar/src/feed-items.ts
+++ b/packages/aris-source-google-calendar/src/feed-items.ts
@@ -0,0 +1,22 @@
+import type { FeedItem } from "@aris/core"
+
+import type { CalendarEventData } from "./types"
+
+export const CalendarFeedItemType = {
+	event: "calendar-event",
+	allDay: "calendar-all-day",
+} as const
+
+export type CalendarFeedItemType = (typeof CalendarFeedItemType)[keyof typeof CalendarFeedItemType]
+
+export interface CalendarEventFeedItem extends FeedItem<
+	typeof CalendarFeedItemType.event,
+	CalendarEventData
+> {}
+
+export interface CalendarAllDayFeedItem extends FeedItem<
+	typeof CalendarFeedItemType.allDay,
+	CalendarEventData
+> {}
+
+export type CalendarFeedItem = CalendarEventFeedItem | CalendarAllDayFeedItem
--- a/packages/aris-source-google-calendar/src/google-calendar-api.ts
+++ b/packages/aris-source-google-calendar/src/google-calendar-api.ts
@@ -0,0 +1,122 @@
+// Google Calendar REST API v3 client
+// https://developers.google.com/calendar/api/v3/reference/events/list
+
+import { type } from "arktype"
+
+import type {
+	ApiCalendarEvent,
+	GoogleCalendarClient,
+	GoogleOAuthProvider,
+	ListEventsOptions,
+} from "./types"
+
+import { EventStatus } from "./types"
+
+const eventStatusSchema = type.enumerated(
+	EventStatus.Confirmed,
+	EventStatus.Tentative,
+	EventStatus.Cancelled,
+)
+
+const eventDateTimeSchema = type({
+	"dateTime?": "string",
+	"date?": "string",
+	"timeZone?": "string",
+})
+
+const eventSchema = type({
+	id: "string",
+	status: eventStatusSchema,
+	htmlLink: "string",
+	"summary?": "string",
+	"description?": "string",
+	"location?": "string",
+	start: eventDateTimeSchema,
+	end: eventDateTimeSchema,
+})
+
+const calendarListEntrySchema = type({
+	id: "string",
+})
+
+const calendarListResponseSchema = type({
+	"items?": calendarListEntrySchema.array(),
+	"nextPageToken?": "string",
+})
+
+const eventsResponseSchema = type({
+	"items?": eventSchema.array(),
+	"nextPageToken?": "string",
+})
+
+export class DefaultGoogleCalendarClient implements GoogleCalendarClient {
+	private static readonly API_BASE = "https://www.googleapis.com/calendar/v3"
+
+	private readonly oauthProvider: GoogleOAuthProvider
+
+	constructor(oauthProvider: GoogleOAuthProvider) {
+		this.oauthProvider = oauthProvider
+	}
+
+	async listCalendarIds(): Promise<string[]> {
+		const url = `${DefaultGoogleCalendarClient.API_BASE}/users/me/calendarList?fields=items(id)`
+		const json = await this.request(url)
+		const result = calendarListResponseSchema(json)
+
+		if (result instanceof type.errors) {
+			throw new Error(`Google Calendar API response validation failed: ${result.summary}`)
+		}
+
+		if (!result.items) {
+			return []
+		}
+		return result.items.map((entry) => entry.id)
+	}
+
+	async listEvents(options: ListEventsOptions): Promise<ApiCalendarEvent[]> {
+		const url = new URL(
+			`${DefaultGoogleCalendarClient.API_BASE}/calendars/${encodeURIComponent(options.calendarId)}/events`,
+		)
+		url.searchParams.set("timeMin", options.timeMin.toISOString())
+		url.searchParams.set("timeMax", options.timeMax.toISOString())
+		url.searchParams.set("singleEvents", "true")
+		url.searchParams.set("orderBy", "startTime")
+
+		const json = await this.request(url.toString())
+		const result = eventsResponseSchema(json)
+
+		if (result instanceof type.errors) {
+			throw new Error(`Google Calendar API response validation failed: ${result.summary}`)
+		}
+
+		if (!result.items) {
+			return []
+		}
+
+		return result.items
+	}
+
+	/** Authenticated GET with auto token refresh on 401. */
+	private async request(url: string): Promise<unknown> {
+		const token = await this.oauthProvider.fetchAccessToken()
+		let response = await fetch(url, {
+			headers: { Authorization: `Bearer ${token}` },
+		})
+
+		if (response.status === 401) {
+			const newToken = await this.oauthProvider.refresh()
+			response = await fetch(url, {
+				headers: { Authorization: `Bearer ${newToken}` },
+			})
+		}
+
+		if (!response.ok) {
+			const body = await response.text()
+			throw new Error(
+				`Google Calendar API error: ${response.status} ${response.statusText}: ${body}`,
+			)
+		}
+
+		return response.json()
+	}
+}
--- a/packages/aris-source-google-calendar/src/google-calendar-source.test.ts
+++ b/packages/aris-source-google-calendar/src/google-calendar-source.test.ts
@@ -0,0 +1,290 @@
+import { contextValue, type Context } from "@aris/core"
+import { describe, expect, test } from "bun:test"
+
+import type { ApiCalendarEvent, GoogleCalendarClient, ListEventsOptions } from "./types"
+
+import fixture from "../fixtures/events.json"
+import { NextEventKey } from "./calendar-context"
+import { CalendarFeedItemType } from "./feed-items"
+import { GoogleCalendarSource } from "./google-calendar-source"
+
+const NOW = new Date("2026-01-20T10:00:00Z")
+
+function fixtureEvents(): ApiCalendarEvent[] {
+	return fixture.items as unknown as ApiCalendarEvent[]
+}
+
+function createMockClient(
+	eventsByCalendar: Record<string, ApiCalendarEvent[]>,
+): GoogleCalendarClient {
+	return {
+		listCalendarIds: async () => Object.keys(eventsByCalendar),
+		listEvents: async (options: ListEventsOptions) => {
+			const events = eventsByCalendar[options.calendarId] ?? []
+			return events.filter((e) => {
+				const startRaw = e.start.dateTime ?? e.start.date ?? ""
+				const endRaw = e.end.dateTime ?? e.end.date ?? ""
+				return (
+					new Date(startRaw).getTime() < options.timeMax.getTime() &&
+					new Date(endRaw).getTime() > options.timeMin.getTime()
+				)
+			})
+		},
+	}
+}
+
+function defaultMockClient(): GoogleCalendarClient {
+	return createMockClient({ primary: fixtureEvents() })
+}
+
+function createContext(time?: Date): Context {
+	return { time: time ?? NOW }
+}
+
+describe("GoogleCalendarSource", () => {
+	describe("constructor", () => {
+		test("has correct id", () => {
+			const source = new GoogleCalendarSource({ client: defaultMockClient() })
+			expect(source.id).toBe("google-calendar")
+		})
+	})
+
+	describe("fetchItems", () => {
+		test("returns empty array when no events", async () => {
+			const source = new GoogleCalendarSource({ client: createMockClient({ primary: [] }) })
+			const items = await source.fetchItems(createContext())
+			expect(items).toEqual([])
+		})
+
+		test("returns feed items for all events in window", async () => {
+			const source = new GoogleCalendarSource({ client: defaultMockClient() })
+			const items = await source.fetchItems(createContext())
+
+			expect(items.length).toBe(fixture.items.length)
+		})
+
+		test("assigns calendar-event type to timed events", async () => {
+			const source = new GoogleCalendarSource({ client: defaultMockClient() })
+			const items = await source.fetchItems(createContext())
+
+			const timedItems = items.filter((i) => i.type === CalendarFeedItemType.event)
+			expect(timedItems.length).toBe(4)
+		})
+
+		test("assigns calendar-all-day type to all-day events", async () => {
+			const source = new GoogleCalendarSource({ client: defaultMockClient() })
+			const items = await source.fetchItems(createContext())
+
+			const allDayItems = items.filter((i) => i.type === CalendarFeedItemType.allDay)
+			expect(allDayItems.length).toBe(1)
+		})
+
+		test("ongoing events get highest priority (1.0)", async () => {
+			const source = new GoogleCalendarSource({ client: defaultMockClient() })
+			const items = await source.fetchItems(createContext())
+
+			const ongoing = items.find((i) => i.data.eventId === "evt-ongoing")
+			expect(ongoing).toBeDefined()
+			expect(ongoing!.priority).toBe(1.0)
+		})
+
+		test("upcoming events get higher priority when sooner", async () => {
+			const source = new GoogleCalendarSource({ client: defaultMockClient() })
+			const items = await source.fetchItems(createContext())
+
+			const soon = items.find((i) => i.data.eventId === "evt-soon")
+			const later = items.find((i) => i.data.eventId === "evt-later")
+
+			expect(soon).toBeDefined()
+			expect(later).toBeDefined()
+			expect(soon!.priority).toBeGreaterThan(later!.priority)
+		})
+
+		test("all-day events get flat priority (0.4)", async () => {
+			const source = new GoogleCalendarSource({ client: defaultMockClient() })
+			const items = await source.fetchItems(createContext())
+
+			const allDay = items.find((i) => i.data.eventId === "evt-allday")
+			expect(allDay).toBeDefined()
+			expect(allDay!.priority).toBe(0.4)
+		})
+
+		test("generates unique IDs for each item", async () => {
+			const source = new GoogleCalendarSource({ client: defaultMockClient() })
+			const items = await source.fetchItems(createContext())
+
+			const ids = items.map((i) => i.id)
+			const uniqueIds = new Set(ids)
+			expect(uniqueIds.size).toBe(ids.length)
+		})
+
+		test("sets timestamp from context.time", async () => {
+			const source = new GoogleCalendarSource({ client: defaultMockClient() })
+			const items = await source.fetchItems(createContext())
+
+			for (const item of items) {
+				expect(item.timestamp).toEqual(NOW)
+			}
+		})
+
+		test("respects lookaheadHours", async () => {
+			// Only 2 hours lookahead from 10:00 → events before 12:00
+			const source = new GoogleCalendarSource({
+				client: defaultMockClient(),
+				lookaheadHours: 2,
+			})
+			const items = await source.fetchItems(createContext())
+
+			// Should include: ongoing (09:30-10:15), soon (10:10-10:40), allday (00:00-next day)
+			// Should exclude: later (14:00), tentative lunch (12:00)
+			const eventIds = items.map((i) => i.data.eventId)
+			expect(eventIds).toContain("evt-ongoing")
+			expect(eventIds).toContain("evt-soon")
+			expect(eventIds).toContain("evt-allday")
+			expect(eventIds).not.toContain("evt-later")
+			expect(eventIds).not.toContain("evt-tentative")
+		})
+
+		test("defaults to all user calendars via listCalendarIds", async () => {
+			const workEvent: ApiCalendarEvent = {
+				id: "evt-work",
+				status: "confirmed",
+				htmlLink: "https://calendar.google.com/event?eid=evt-work",
+				summary: "Work Meeting",
+				start: { dateTime: "2026-01-20T11:00:00Z" },
+				end: { dateTime: "2026-01-20T12:00:00Z" },
+			}
+
+			const client = createMockClient({
+				primary: fixtureEvents(),
+				"work@example.com": [workEvent],
+			})
+
+			// No calendarIds provided — should discover both calendars
+			const source = new GoogleCalendarSource({ client })
+			const items = await source.fetchItems(createContext())
+
+			const eventIds = items.map((i) => i.data.eventId)
+			expect(eventIds).toContain("evt-work")
+			expect(eventIds).toContain("evt-ongoing")
+		})
+
+		test("fetches from explicit calendar IDs", async () => {
+			const workEvent: ApiCalendarEvent = {
+				id: "evt-work",
+				status: "confirmed",
+				htmlLink: "https://calendar.google.com/event?eid=evt-work",
+				summary: "Work Meeting",
+				start: { dateTime: "2026-01-20T11:00:00Z" },
+				end: { dateTime: "2026-01-20T12:00:00Z" },
+			}
+
+			const client = createMockClient({
+				primary: fixtureEvents(),
+				"work@example.com": [workEvent],
+			})
+
+			const source = new GoogleCalendarSource({
+				client,
+				calendarIds: ["primary", "work@example.com"],
+			})
+			const items = await source.fetchItems(createContext())
+
+			const eventIds = items.map((i) => i.data.eventId)
+			expect(eventIds).toContain("evt-work")
+			expect(eventIds).toContain("evt-ongoing")
+		})
+	})
+
+	describe("fetchContext", () => {
+		test("returns empty when no events", async () => {
+			const source = new GoogleCalendarSource({ client: createMockClient({ primary: [] }) })
+			const result = await source.fetchContext(createContext())
+			expect(result).toEqual({})
+		})
+
+		test("returns empty when only all-day events", async () => {
+			const allDayOnly: ApiCalendarEvent[] = [
+				{
+					id: "evt-allday",
+					status: "confirmed",
+					htmlLink: "https://calendar.google.com/event?eid=evt-allday",
+					summary: "Holiday",
+					start: { date: "2026-01-20" },
+					end: { date: "2026-01-21" },
+				},
+			]
+			const source = new GoogleCalendarSource({
+				client: createMockClient({ primary: allDayOnly }),
+			})
+			const result = await source.fetchContext(createContext())
+			expect(result).toEqual({})
+		})
+
+		test("returns next upcoming timed event (not ongoing)", async () => {
+			const source = new GoogleCalendarSource({ client: defaultMockClient() })
+			const result = await source.fetchContext(createContext())
+
+			const nextEvent = contextValue(result as Context, NextEventKey)
+			expect(nextEvent).toBeDefined()
+			// evt-soon starts at 10:10, which is the nearest future timed event
+			expect(nextEvent!.title).toBe("1:1 with Manager")
+			expect(nextEvent!.minutesUntilStart).toBe(10)
+			expect(nextEvent!.location).toBeNull()
+		})
+
+		test("includes location when available", async () => {
+			const events: ApiCalendarEvent[] = [
+				{
+					id: "evt-loc",
+					status: "confirmed",
+					htmlLink: "https://calendar.google.com/event?eid=evt-loc",
+					summary: "Offsite",
+					location: "123 Main St",
+					start: { dateTime: "2026-01-20T11:00:00Z" },
+					end: { dateTime: "2026-01-20T12:00:00Z" },
+				},
+			]
+			const source = new GoogleCalendarSource({
+				client: createMockClient({ primary: events }),
+			})
+			const result = await source.fetchContext(createContext())
+
+			const nextEvent = contextValue(result as Context, NextEventKey)
+			expect(nextEvent).toBeDefined()
+			expect(nextEvent!.location).toBe("123 Main St")
+		})
+
+		test("skips ongoing events for next-event context", async () => {
+			const events: ApiCalendarEvent[] = [
+				{
+					id: "evt-now",
+					status: "confirmed",
+					htmlLink: "https://calendar.google.com/event?eid=evt-now",
+					summary: "Current Meeting",
+					start: { dateTime: "2026-01-20T09:30:00Z" },
+					end: { dateTime: "2026-01-20T10:30:00Z" },
+				},
+			]
+			const source = new GoogleCalendarSource({
+				client: createMockClient({ primary: events }),
+			})
+			const result = await source.fetchContext(createContext())
+			expect(result).toEqual({})
+		})
+	})
+
+	describe("priority ordering", () => {
+		test("ongoing > upcoming > all-day", async () => {
+			const source = new GoogleCalendarSource({ client: defaultMockClient() })
+			const items = await source.fetchItems(createContext())
+
+			const ongoing = items.find((i) => i.data.eventId === "evt-ongoing")!
+			const upcoming = items.find((i) => i.data.eventId === "evt-soon")!
+			const allDay = items.find((i) => i.data.eventId === "evt-allday")!
+
+			expect(ongoing.priority).toBeGreaterThan(upcoming.priority)
+			expect(upcoming.priority).toBeGreaterThan(allDay.priority)
+		})
+	})
+})
--- a/packages/aris-source-google-calendar/src/google-calendar-source.ts
+++ b/packages/aris-source-google-calendar/src/google-calendar-source.ts
@@ -0,0 +1,202 @@
+import type { Context, FeedSource } from "@aris/core"
+
+import type {
+	ApiCalendarEvent,
+	CalendarEventData,
+	GoogleCalendarClient,
+	GoogleOAuthProvider,
+} from "./types"
+
+import { NextEventKey, type NextEvent } from "./calendar-context"
+
+interface GoogleCalendarSourceBaseOptions {
+	calendarIds?: string[]
+	/** Default: 24 */
+	lookaheadHours?: number
+}
+
+interface GoogleCalendarSourceWithProvider extends GoogleCalendarSourceBaseOptions {
+	oauthProvider: GoogleOAuthProvider
+	client?: never
+}
+
+interface GoogleCalendarSourceWithClient extends GoogleCalendarSourceBaseOptions {
+	oauthProvider?: never
+	client: GoogleCalendarClient
+}
+
+export type GoogleCalendarSourceOptions =
+	| GoogleCalendarSourceWithProvider
+	| GoogleCalendarSourceWithClient
+import { CalendarFeedItemType, type CalendarFeedItem } from "./feed-items"
+import { DefaultGoogleCalendarClient } from "./google-calendar-api"
+
+const DEFAULT_LOOKAHEAD_HOURS = 24
+
+const PRIORITY_ONGOING = 1.0
+const PRIORITY_UPCOMING_MAX = 0.9
+const PRIORITY_UPCOMING_MIN = 0.3
+const PRIORITY_ALL_DAY = 0.4
+
+/**
+ * A FeedSource that provides Google Calendar events and next-event context.
+ *
+ * Fetches upcoming and all-day events within a configurable lookahead window.
+ * Provides a NextEvent context for downstream sources to react to the user's schedule.
+ *
+ * @example
+ * ```ts
+ * const calendarSource = new GoogleCalendarSource({
+ *   oauthProvider: myOAuthProvider,
+ *   calendarIds: ["primary", "work@example.com"],
+ *   lookaheadHours: 12,
+ * })
+ *
+ * const engine = new FeedEngine()
+ *   .register(calendarSource)
+ *
+ * // Access next-event context in downstream sources
+ * const next = contextValue(context, NextEventKey)
+ * if (next && next.minutesUntilStart < 15) {
+ *   // remind user
+ * }
+ * ```
+ */
+export class GoogleCalendarSource implements FeedSource<CalendarFeedItem> {
+	readonly id = "google-calendar"
+
+	private readonly client: GoogleCalendarClient
+	private readonly calendarIds: string[] | undefined
+	private readonly lookaheadHours: number
+
+	constructor(options: GoogleCalendarSourceOptions) {
+		this.client = options.client ?? new DefaultGoogleCalendarClient(options.oauthProvider)
+		this.calendarIds = options.calendarIds
+		this.lookaheadHours = options.lookaheadHours ?? DEFAULT_LOOKAHEAD_HOURS
+	}
+
+	async fetchContext(context: Context): Promise<Partial<Context>> {
+		const events = await this.fetchAllEvents(context.time)
+
+		const now = context.time.getTime()
+		const nextTimedEvent = events.find((e) => !e.isAllDay && e.startTime.getTime() > now)
+
+		if (!nextTimedEvent) {
+			return {}
+		}
+
+		const minutesUntilStart = (nextTimedEvent.startTime.getTime() - now) / 60_000
+
+		const nextEvent: NextEvent = {
+			title: nextTimedEvent.title,
+			startTime: nextTimedEvent.startTime,
+			endTime: nextTimedEvent.endTime,
+			minutesUntilStart,
+			location: nextTimedEvent.location,
+		}
+
+		return { [NextEventKey]: nextEvent }
+	}
+
+	async fetchItems(context: Context): Promise<CalendarFeedItem[]> {
+		const events = await this.fetchAllEvents(context.time)
+		const now = context.time.getTime()
+		const lookaheadMs = this.lookaheadHours * 60 * 60 * 1000
+
+		return events.map((event) => createFeedItem(event, now, lookaheadMs))
+	}
+
+	private async resolveCalendarIds(): Promise<string[]> {
+		if (this.calendarIds) {
+			return this.calendarIds
+		}
+		return this.client.listCalendarIds()
+	}
+
+	private async fetchAllEvents(time: Date): Promise<CalendarEventData[]> {
+		const timeMax = new Date(time.getTime() + this.lookaheadHours * 60 * 60 * 1000)
+		const calendarIds = await this.resolveCalendarIds()
+
+		const results = await Promise.all(
+			calendarIds.map(async (calendarId) => {
+				const raw = await this.client.listEvents({
+					calendarId,
+					timeMin: time,
+					timeMax,
+				})
+				return raw.map((event) => parseEvent(event, calendarId))
+			}),
+		)
+
+		const allEvents = results.flat()
+
+		// Sort by start time ascending
+		allEvents.sort((a, b) => a.startTime.getTime() - b.startTime.getTime())
+
+		return allEvents
+	}
+}
+
+function parseEvent(event: ApiCalendarEvent, calendarId: string): CalendarEventData {
+	const startRaw = event.start.dateTime ?? event.start.date
+	const endRaw = event.end.dateTime ?? event.end.date
+
+	if (!startRaw || !endRaw) {
+		throw new Error(`Event ${event.id} is missing start or end date`)
+	}
+
+	const isAllDay = !event.start.dateTime
+
+	return {
+		eventId: event.id,
+		calendarId,
+		title: event.summary ?? "(No title)",
+		description: event.description ?? null,
+		location: event.location ?? null,
+		startTime: new Date(startRaw),
+		endTime: new Date(endRaw),
+		isAllDay,
+		status: event.status,
+		htmlLink: event.htmlLink,
+	}
+}
+
+function computePriority(event: CalendarEventData, nowMs: number, lookaheadMs: number): number {
+	if (event.isAllDay) {
+		return PRIORITY_ALL_DAY
+	}
+
+	const startMs = event.startTime.getTime()
+	const endMs = event.endTime.getTime()
+
+	// Ongoing: start <= now < end
+	if (startMs <= nowMs && nowMs < endMs) {
+		return PRIORITY_ONGOING
+	}
+
+	// Upcoming: linear decay from PRIORITY_UPCOMING_MAX to PRIORITY_UPCOMING_MIN
+	const msUntilStart = startMs - nowMs
+	if (msUntilStart <= 0) {
+		return PRIORITY_UPCOMING_MIN
+	}
+
+	const ratio = Math.min(msUntilStart / lookaheadMs, 1)
+	return PRIORITY_UPCOMING_MAX - ratio * (PRIORITY_UPCOMING_MAX - PRIORITY_UPCOMING_MIN)
+}
+
+function createFeedItem(
+	event: CalendarEventData,
+	nowMs: number,
+	lookaheadMs: number,
+): CalendarFeedItem {
+	const priority = computePriority(event, nowMs, lookaheadMs)
+	const itemType = event.isAllDay ? CalendarFeedItemType.allDay : CalendarFeedItemType.event
+
+	return {
+		id: `calendar-${event.calendarId}-${event.eventId}`,
+		type: itemType,
+		priority,
+		timestamp: new Date(nowMs),
+		data: event,
+	}
+}
--- a/packages/aris-source-google-calendar/src/index.ts
+++ b/packages/aris-source-google-calendar/src/index.ts
@@ -0,0 +1,20 @@
+export { NextEventKey, type NextEvent } from "./calendar-context"
+export {
+	CalendarFeedItemType,
+	type CalendarFeedItemType as CalendarFeedItemTypeType,
+	type CalendarAllDayFeedItem,
+	type CalendarEventFeedItem,
+	type CalendarFeedItem,
+} from "./feed-items"
+export { DefaultGoogleCalendarClient } from "./google-calendar-api"
+export { GoogleCalendarSource, type GoogleCalendarSourceOptions } from "./google-calendar-source"
+export {
+	EventStatus,
+	type EventStatus as EventStatusType,
+	type ApiCalendarEvent,
+	type ApiEventDateTime,
+	type CalendarEventData,
+	type GoogleCalendarClient,
+	type GoogleOAuthProvider,
+	type ListEventsOptions,
+} from "./types"
--- a/packages/aris-source-google-calendar/src/types.ts
+++ b/packages/aris-source-google-calendar/src/types.ts
@@ -0,0 +1,55 @@
+export interface GoogleOAuthProvider {
+	fetchAccessToken(): Promise<string>
+	refresh(): Promise<string>
+	revoke(): Promise<void>
+}
+
+export const EventStatus = {
+	Confirmed: "confirmed",
+	Tentative: "tentative",
+	Cancelled: "cancelled",
+} as const
+
+export type EventStatus = (typeof EventStatus)[keyof typeof EventStatus]
+
+/** Exactly one of dateTime or date is present. */
+export interface ApiEventDateTime {
+	dateTime?: string
+	date?: string
+	timeZone?: string
+}
+
+export interface ApiCalendarEvent {
+	id: string
+	status: EventStatus
+	htmlLink: string
+	summary?: string
+	description?: string
+	location?: string
+	start: ApiEventDateTime
+	end: ApiEventDateTime
+}
+
+export type CalendarEventData = {
+	eventId: string
+	calendarId: string
+	title: string
+	description: string | null
+	location: string | null
+	startTime: Date
+	endTime: Date
+	isAllDay: boolean
+	status: EventStatus
+	htmlLink: string
+}
+
+export interface ListEventsOptions {
+	calendarId: string
+	timeMin: Date
+	timeMax: Date
+}
+
+export interface GoogleCalendarClient {
+	listCalendarIds(): Promise<string[]>
+	listEvents(options: ListEventsOptions): Promise<ApiCalendarEvent[]>
+}
Author	SHA1	Message	Date
kenneth	bfdc5e67b7	chore: restore default comment on lookaheadHours Co-authored-by: Ona <no-reply@ona.com>	2026-02-14 15:43:00 +00:00
kenneth	2cf6536e48	refactor: move source options into source file Co-authored-by: Ona <no-reply@ona.com>	2026-02-14 15:42:59 +00:00
kenneth	c7a1048320	chore: remove obvious comments from types Co-authored-by: Ona <no-reply@ona.com>	2026-02-14 15:42:59 +00:00
kenneth	512faf191e	feat: add Google Calendar data source Co-authored-by: Ona <no-reply@ona.com>	2026-02-14 15:42:59 +00:00
Kenneth	e5d65816dc	Merge pull request #24 from kennethnym/feat/apple-calendar-source feat: add Apple Calendar source package	2026-02-14 15:42:04 +00:00
kenneth	13c411c842	perf: cache fetched events within a refresh cycle FeedEngine calls fetchContext then fetchItems with the same context. Cache events by context.time reference to avoid duplicate CalDAV round-trips. Co-authored-by: Ona <no-reply@ona.com>	2026-02-14 15:36:36 +00:00
kenneth	e8ba49d7bb	refactor: use switch/case in parser, move options - Replace if/else chains with switch/case in ical-parser - Move CalendarSourceOptions to calendar-source.ts Co-authored-by: Ona <no-reply@ona.com>	2026-02-14 15:29:49 +00:00
kenneth	3010eb8990	refactor: replace Map with Record in tests Co-authored-by: Ona <no-reply@ona.com>	2026-02-14 15:20:23 +00:00