diff --git a/README.md b/README.md
index 2cc941d..0a71ffa 100644
--- a/README.md
+++ b/README.md
@@ -198,7 +198,7 @@ The package build emits ESM, CommonJS, and TypeScript declaration output under `
 The conformance adapter reports its claimed TaskNotes profile and implements
 the official `core-lite` operation surface. Its fixture run currently passes
 4,974 cases with zero failures; the extended-profile fixture remains outside
-that claim. The mdbase generator emits the `tasknotes.task 0.2.0` contract,
+that claim. The mdbase generator emits the `tasknotes.task 0.3.0-rc.1` record contract,
 its two JSON Schemas, and a type whose `implements` entry contains field
 mappings and TaskNotes behavior. Round-trip tests resolve those resources back
 into model configuration so filesystem-backed hosts can treat the type as a
diff --git a/package-lock.json b/package-lock.json
index 311eb11..95f2dfb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
 	"name": "@tasknotes/model",
-	"version": "0.3.0-rc.3",
+	"version": "0.3.0-rc.4",
 	"lockfileVersion": 3,
 	"requires": true,
 	"packages": {
 		"": {
 			"name": "@tasknotes/model",
-			"version": "0.3.0-rc.3",
+			"version": "0.3.0-rc.4",
 			"license": "MIT",
 			"dependencies": {
 				"@callumalpass/mdbase-runtime": "0.1.0-rc.1",
diff --git a/package.json b/package.json
index 11172ab..6d73118 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "@tasknotes/model",
-	"version": "0.3.0-rc.3",
+	"version": "0.3.0-rc.4",
 	"description": "TaskNotes model, mapping, validation, recurrence, and operation-planning reference implementation.",
 	"license": "MIT",
 	"type": "module",
diff --git a/scripts/sync-tasknotes-contract.mjs b/scripts/sync-tasknotes-contract.mjs
index f98df78..a07285c 100644
--- a/scripts/sync-tasknotes-contract.mjs
+++ b/scripts/sync-tasknotes-contract.mjs
@@ -9,8 +9,12 @@ const generatedPath = path.resolve(
 	"../src/generated/tasknotes-data-contract.ts"
 );
 
-const [taskSchema, bindingSchema] = await Promise.all(
-	["tasknotes-task.schema.json", "tasknotes-task-binding.schema.json"].map(
+const [taskSchema, bindingSchema, completedEventSchema] = await Promise.all(
+	[
+		"tasknotes-task.schema.json",
+		"tasknotes-task-binding.schema.json",
+		"tasknotes-task-completed.schema.json",
+	].map(
 		async (name) =>
 			JSON.parse(
 				await readFile(path.join(specRoot, "schemas", name), "utf8")
@@ -24,6 +28,8 @@ const source = `// Generated by scripts/sync-tasknotes-contract.mjs from tasknot
 export const TASKNOTES_TASK_SCHEMA = ${JSON.stringify(taskSchema, null, "\t")} as const;
 
 export const TASKNOTES_TASK_BINDING_SCHEMA = ${JSON.stringify(bindingSchema, null, "\t")} as const;
+
+export const TASKNOTES_TASK_COMPLETED_EVENT_SCHEMA = ${JSON.stringify(completedEventSchema, null, "\t")} as const;
 `;
 
 await mkdir(path.dirname(generatedPath), { recursive: true });
diff --git a/src/generated/tasknotes-data-contract.ts b/src/generated/tasknotes-data-contract.ts
index 4b2c0ff..dea06dc 100644
--- a/src/generated/tasknotes-data-contract.ts
+++ b/src/generated/tasknotes-data-contract.ts
@@ -5,7 +5,7 @@ export const TASKNOTES_TASK_SCHEMA = {
 	"$schema": "https://json-schema.org/draft/2020-12/schema",
 	"$id": "https://tasknotes.dev/schemas/tasknotes-task.schema.json",
 	"title": "TaskNotes portable task view",
-	"description": "The storage-neutral record view exposed by the tasknotes.task 0.2.0 data contract.",
+	"description": "The storage-neutral record view exposed by the tasknotes.task 0.3.0-rc.1 record contract.",
 	"type": "object",
 	"required": [
 		"status",
@@ -174,7 +174,7 @@ export const TASKNOTES_TASK_BINDING_SCHEMA = {
 	"$schema": "https://json-schema.org/draft/2020-12/schema",
 	"$id": "https://tasknotes.dev/schemas/tasknotes-task-binding.schema.json",
 	"title": "TaskNotes task data-contract binding",
-	"description": "Semantic configuration supplied by an mdbase type that implements tasknotes.task 0.2.0.",
+	"description": "Semantic configuration supplied by an mdbase type that implements tasknotes.task 0.3.0-rc.1.",
 	"type": "object",
 	"required": [
 		"profiles",
@@ -642,3 +642,45 @@ export const TASKNOTES_TASK_BINDING_SCHEMA = {
 		}
 	}
 } as const;
+
+export const TASKNOTES_TASK_COMPLETED_EVENT_SCHEMA = {
+	"$schema": "https://json-schema.org/draft/2020-12/schema",
+	"$id": "https://tasknotes.dev/schemas/tasknotes-task-completed.schema.json",
+	"title": "TaskNotes task-completed event data",
+	"description": "The minimal portable signal emitted when a task enters a completed status.",
+	"type": "object",
+	"required": [
+		"task_id",
+		"task_path",
+		"title",
+		"status",
+		"completed_at"
+	],
+	"additionalProperties": false,
+	"properties": {
+		"task_id": {
+			"type": "string",
+			"minLength": 1,
+			"description": "Stable task identity when available, otherwise the normalized task path."
+		},
+		"task_path": {
+			"type": "string",
+			"minLength": 1,
+			"description": "Normalized vault-relative task path at the time of the transition."
+		},
+		"title": {
+			"type": "string",
+			"minLength": 1
+		},
+		"status": {
+			"type": "string",
+			"minLength": 1,
+			"description": "The completed status entered by the task."
+		},
+		"completed_at": {
+			"type": "string",
+			"format": "date-time",
+			"description": "When TaskNotes observed the completion transition."
+		}
+	}
+} as const;
diff --git a/src/mdbase.ts b/src/mdbase.ts
index 282e2ce..0630494 100644
--- a/src/mdbase.ts
+++ b/src/mdbase.ts
@@ -2,6 +2,7 @@ import YAML from "yaml";
 import { resolveModelConfig } from "./config";
 import {
 	TASKNOTES_TASK_BINDING_SCHEMA,
+	TASKNOTES_TASK_COMPLETED_EVENT_SCHEMA,
 	TASKNOTES_TASK_SCHEMA,
 } from "./generated/tasknotes-data-contract";
 import { TASKNOTES_SPEC_VERSION } from "./types";
@@ -14,6 +15,22 @@ import type {
 } from "./types";
 
 export const MDBASE_SPEC_VERSION = "0.3.0";
+export const TASKNOTES_TASK_CONTRACT_VERSION = TASKNOTES_SPEC_VERSION;
+export const TASKNOTES_TASK_COMPLETED_EVENT_VERSION = "1.0.0";
+
+export const TASKNOTES_TASK_COMPLETED_EVENT_CONTRACT = {
+	kind: "mdbase.contract",
+	contract_type: "event",
+	id: "tasknotes.task.completed",
+	version: TASKNOTES_TASK_COMPLETED_EVENT_VERSION,
+	name: "TaskNotes task completed",
+	description:
+		"A TaskNotes task moved from a non-completed status to a completed status.",
+	data_schema: {
+		dialect: "json-schema-2020-12",
+		value: TASKNOTES_TASK_COMPLETED_EVENT_SCHEMA,
+	},
+} as const;
 
 export const DEFAULT_TASKNOTES_MDBASE_PROFILES = [
 	"core-lite",
@@ -727,11 +744,12 @@ export function buildTaskNotesMdbaseResources(
 	) as Record<string, unknown>;
 	const contract: Record<string, unknown> = {
 		kind: "mdbase.contract",
+		contract_type: "record",
 		id: "tasknotes.task",
 		version: TASKNOTES_SPEC_VERSION,
 		name: "TaskNotes task",
 		description: `Portable task data and behavior defined by tasknotes-spec ${TASKNOTES_SPEC_VERSION}.`,
-		schema: {
+		record_schema: {
 			dialect: "json-schema-2020-12",
 			ref: relativeResourceReference(
 				`${contractsFolder}/tasknotes.task.md`,
diff --git a/src/types.ts b/src/types.ts
index 9be9957..737e544 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,4 +1,4 @@
-export const TASKNOTES_SPEC_VERSION = "0.2.0";
+export const TASKNOTES_SPEC_VERSION = "0.3.0-rc.1";
 
 export type JsonPrimitive = string | number | boolean | null;
 export type JsonValue = JsonPrimitive | JsonObject | JsonValue[];
diff --git a/test/mdbase.test.mjs b/test/mdbase.test.mjs
index d2e46e8..13e89cf 100644
--- a/test/mdbase.test.mjs
+++ b/test/mdbase.test.mjs
@@ -11,7 +11,7 @@ import {
 function implementation(type) {
 	return type.implements.find(
 		(entry) =>
-			entry.contract === "tasknotes.task" && entry.version === "0.2.0"
+			entry.contract === "tasknotes.task" && entry.version === "0.3.0-rc.1"
 	);
 }
 
@@ -29,9 +29,11 @@ test("builds one canonical TaskNotes and mdbase collection contract", () => {
 	assert.equal(resources.config.spec_version, "0.3.0");
 	assert.equal(resources.config.settings.contracts_folder, "_contracts");
 	assert.equal(resources.contract.id, "tasknotes.task");
-	assert.equal(resources.contract.version, "0.2.0");
+	assert.equal(resources.contract.contract_type, "record");
+	assert.equal(resources.contract.version, "0.3.0-rc.1");
+	assert.ok(resources.contract.record_schema);
 	assert.equal(taskImplementation.contract, "tasknotes.task");
-	assert.equal(taskImplementation.version, "0.2.0");
+	assert.equal(taskImplementation.version, "0.3.0-rc.1");
 	assert.deepEqual(extension.profiles, [
 		"core-lite",
 		"recurrence",
@@ -75,7 +77,7 @@ test("packages the contract, implementation, and schemas as one digest-pinned ty
 	const pack = await buildTaskNotesMdbaseTypePack(resources);
 
 	assert.deepEqual(pack.provides, [
-		{ id: "tasknotes.task", version: "0.2.0" },
+		{ id: "tasknotes.task", version: "0.3.0-rc.1" },
 	]);
 	assert.equal(pack.manifest.kind, "mdbase.type-pack");
 	assert.equal(pack.manifest.id, "tasknotes.task");