diff --git a/crates/Cargo.toml b/crates/Cargo.toml
index 289e4cc3..30db401f 100644
--- a/crates/Cargo.toml
+++ b/crates/Cargo.toml
@@ -15,6 +15,8 @@ members = [
     "khive-pack-gtd",
     "khive-pack-memory",
     "khive-pack-brain",
+    "khive-calendar",
+    "khive-calendar-google",
     "khive-mcp",
     "khive-vcs",
     "kkernel",
diff --git a/crates/khive-calendar-google/Cargo.toml b/crates/khive-calendar-google/Cargo.toml
new file mode 100644
index 00000000..07463996
--- /dev/null
+++ b/crates/khive-calendar-google/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "khive-calendar-google"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+homepage.workspace = true
+keywords.workspace = true
+categories.workspace = true
+description = "Google Calendar handler — reference khive-calendar implementation (OAuth + Calendar API)"
+
+[dependencies]
+khive-types = { version = "0.2.0", path = "../khive-types", features = ["serde"] }
+khive-calendar = { version = "0.2.0", path = "../khive-calendar" }
+async-trait = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+chrono = { workspace = true }
+tokio = { workspace = true }
+tracing = { workspace = true }
diff --git a/crates/khive-calendar-google/src/lib.rs b/crates/khive-calendar-google/src/lib.rs
new file mode 100644
index 00000000..5cf244ec
--- /dev/null
+++ b/crates/khive-calendar-google/src/lib.rs
@@ -0,0 +1,14 @@
+//! khive-calendar-google — Google Calendar reference implementation of [`khive_calendar::CalendarHandler`].
+//!
+//! Demonstrates: OAuth flow, event create/update/cancel, recurrence handling,
+//! availability query, sync with the GTD-owned native calendar.
+//!
+//! Reference implementation for community to model future calendar
+//! integrations on (Apple/iCloud, Outlook, CalDAV, ...).
+//!
+//! **OSS-quality reference**, NOT the gated version Cloud sells. The Cloud
+//! offering will wrap a separate, formal-gate-enforced implementation with
+//! compliance + audit guarantees on top of the same trait surface.
+//!
+//! Scaffold only — auth flow, event lifecycle, and recurrence handling are
+//! deferred (see `.khive/notes/strategy_20260522_open_core_split.md`).
diff --git a/crates/khive-calendar/Cargo.toml b/crates/khive-calendar/Cargo.toml
new file mode 100644
index 00000000..c4415260
--- /dev/null
+++ b/crates/khive-calendar/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "khive-calendar"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+homepage.workspace = true
+keywords.workspace = true
+categories.workspace = true
+description = "Calendar abstraction — the CalendarHandler trait and event envelope types consumed by khive-pack-gtd"
+
+[dependencies]
+khive-types = { version = "0.2.0", path = "../khive-types", features = ["serde"] }
+async-trait = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+chrono = { workspace = true }
+uuid = { workspace = true }
diff --git a/crates/khive-calendar/docs/reference/cal_bridge.applescript b/crates/khive-calendar/docs/reference/cal_bridge.applescript
new file mode 100644
index 00000000..d603c67b
--- /dev/null
+++ b/crates/khive-calendar/docs/reference/cal_bridge.applescript
@@ -0,0 +1,151 @@
+-- cal_bridge.applescript
+-- Reads events from Calendar.app in a date range and outputs JSON to stdout.
+-- Usage:
+--   osascript cal_bridge.applescript
+--   osascript cal_bridge.applescript 7
+--   osascript cal_bridge.applescript 7 30
+--
+-- Parameters:
+--   argv[1] : days_back    (default 7)
+--   argv[2] : days_forward (default 30)
+--
+-- Output: JSON array of event objects.
+
+on escapeJSON(rawText)
+	set t to rawText
+	set t to my replaceText(t, "\\", "\\\\")
+	set t to my replaceText(t, "\"", "\\\"")
+	set t to my replaceText(t, "/", "\\/")
+	set t to my replaceText(t, return, "\\n")
+	set t to my replaceText(t, linefeed, "\\n")
+	set t to my replaceText(t, tab, "\\t")
+	return t
+end escapeJSON
+
+on replaceText(theText, searchStr, replacementStr)
+	set AppleScript's text item delimiters to searchStr
+	set textItems to text items of theText
+	set AppleScript's text item delimiters to replacementStr
+	set result to textItems as string
+	set AppleScript's text item delimiters to ""
+	return result
+end replaceText
+
+on dateToEpoch(d)
+	return (d - (date "Sunday, January 1, 2001 at 12:00:00 AM")) + 978307200
+end dateToEpoch
+
+on joinList(theList, delimiter)
+	set AppleScript's text item delimiters to delimiter
+	set result to theList as string
+	set AppleScript's text item delimiters to ""
+	return result
+end joinList
+
+on run argv
+	set daysBack to 7
+	set daysForward to 30
+
+	if (count of argv) >= 1 then
+		try
+			set daysBack to item 1 of argv as integer
+		end try
+	end if
+	if (count of argv) >= 2 then
+		try
+			set daysForward to item 2 of argv as integer
+		end try
+	end if
+
+	set rangeStart to (current date) - (daysBack * days)
+	set rangeEnd to (current date) + (daysForward * days)
+
+	-- Zero out time on range boundaries for cleaner filtering.
+	set time of rangeStart to 0
+	set time of rangeEnd to 86399 -- end of day
+
+	set jsonParts to {}
+
+	tell application "Calendar"
+		set allCals to every calendar
+
+		repeat with cal in allCals
+			set calName to name of cal
+
+			try
+				-- events between startDate and endDate
+				set calEvents to (every event of cal whose start date >= rangeStart and start date <= rangeEnd)
+
+				repeat with evt in calEvents
+					try
+						set evtUID to uid of evt
+						if evtUID is missing value then set evtUID to ""
+
+						set evtTitle to summary of evt
+						if evtTitle is missing value then set evtTitle to ""
+
+						set evtStart to start date of evt
+						set evtEnd to end date of evt
+						set startEpoch to my dateToEpoch(evtStart)
+						set endEpoch to my dateToEpoch(evtEnd)
+
+						set evtAllDay to allday event of evt
+						set allDayStr to "false"
+						if evtAllDay then set allDayStr to "true"
+
+						set evtLocation to ""
+						try
+							set evtLocation to location of evt
+							if evtLocation is missing value then set evtLocation to ""
+						end try
+
+						set evtNotes to ""
+						try
+							set evtNotes to description of evt
+							if evtNotes is missing value then set evtNotes to ""
+						end try
+
+						set evtRecurrence to ""
+						try
+							set evtRecurrence to recurrence of evt
+							if evtRecurrence is missing value then set evtRecurrence to ""
+						end try
+
+						-- Attendee emails: use email property (name property throws errors).
+						set attendeeList to {}
+						try
+							set evtAttendees to attendees of evt
+							repeat with att in evtAttendees
+								try
+									set attEmail to email of att
+									if attEmail is not missing value and attEmail is not "" then
+										set end of attendeeList to "\"" & my escapeJSON(attEmail) & "\""
+									end if
+								end try
+							end repeat
+						end try
+						set attendeesJSON to "[" & my joinList(attendeeList, ",") & "]"
+
+						set jsonObj to "{" & ¬
+							"\"uid\":\"" & my escapeJSON(evtUID) & "\"," & ¬
+							"\"title\":\"" & my escapeJSON(evtTitle) & "\"," & ¬
+							"\"start_date\":" & startEpoch & "," & ¬
+							"\"end_date\":" & endEpoch & "," & ¬
+							"\"calendar\":\"" & my escapeJSON(calName) & "\"," & ¬
+							"\"location\":\"" & my escapeJSON(evtLocation) & "\"," & ¬
+							"\"notes\":\"" & my escapeJSON(evtNotes) & "\"," & ¬
+							"\"all_day\":" & allDayStr & "," & ¬
+							"\"recurrence\":\"" & my escapeJSON(evtRecurrence) & "\"," & ¬
+							"\"attendee_emails\":" & attendeesJSON & ¬
+							"}"
+
+						set end of jsonParts to jsonObj
+					end try
+				end repeat
+			end try
+		end repeat
+	end tell
+
+	set jsonOutput to "[" & my joinList(jsonParts, ",") & "]"
+	return jsonOutput
+end run
diff --git a/crates/khive-calendar/src/lib.rs b/crates/khive-calendar/src/lib.rs
new file mode 100644
index 00000000..f7428f44
--- /dev/null
+++ b/crates/khive-calendar/src/lib.rs
@@ -0,0 +1,17 @@
+//! khive-calendar — calendar abstraction layer.
+//!
+//! Defines the [`CalendarHandler`] trait that concrete calendar crates
+//! (`khive-calendar-native`, `khive-calendar-google`, `khive-calendar-apple`, ...)
+//! implement. Consumed by `khive-pack-gtd` to schedule tasks, surface
+//! deadlines, and roundtrip events between khive's GTD model and the agent's
+//! external calendar(s).
+//!
+//! Mirrors the [`khive_channel::ChannelHandler`] pattern used by
+//! `khive-pack-comm`. The same open-core split applies: OSS provides the
+//! trait + reference impls; Cloud provides gated, audited, capability-scoped
+//! hosted calendar services.
+//!
+//! Scaffold only — detailed trait surface (event create/update/cancel,
+//! availability query, recurrence model, RFC 5545 mapping) and registration
+//! mechanism are deferred (see
+//! `.khive/notes/strategy_20260522_open_core_split.md`).