diff --git a/packages/paperclip-runner/scripts/candidate-provider-pack.mjs b/packages/paperclip-runner/scripts/candidate-provider-pack.mjs
index 083d8fbb3a4..3d2f73f16c8 100644
--- a/packages/paperclip-runner/scripts/candidate-provider-pack.mjs
+++ b/packages/paperclip-runner/scripts/candidate-provider-pack.mjs
@@ -1,3 +1,4 @@
+import { materializePinnedCursorDistribution } from "./materialize-cursor-distribution.mjs";
 const CANDIDATES = new Set(["cursor", "copilot", "pi"]);
 
 export function parseProviderPackArguments(args) {
@@ -18,5 +19,11 @@ export function parseProviderPackArguments(args) {
 /** Closed source-owned builder registry; provider branches add their exact pins. */
 export async function materializeCandidateProviderPack({ provider, outputRoot }) {
   if (!CANDIDATES.has(provider)) throw new Error("Unknown candidate provider");
+  if (provider === "cursor") {
+    const result = await materializePinnedCursorDistribution({ destination: outputRoot });
+    return { version: result.version,
+      profileDigest: "sha256:1157a5d071abbd57ab132f22bace75c65e84cc47a045b0023475488755e14899",
+      closureDigest: `sha256:${result.closureSha256}` };
+  }
   throw new Error(`The ${provider} candidate distribution builder is not included in this source revision`);
 }
diff --git a/packages/paperclip-runner/src/drivers/acpx/capability-profiles.ts b/packages/paperclip-runner/src/drivers/acpx/capability-profiles.ts
index 4a70c22e25b..18f9ad57e8d 100644
--- a/packages/paperclip-runner/src/drivers/acpx/capability-profiles.ts
+++ b/packages/paperclip-runner/src/drivers/acpx/capability-profiles.ts
@@ -43,7 +43,7 @@ export const ACPX_CAPABILITY_PROFILES: Readonly<Record<QualifiedAcpxAgent, AcpxC
     recovery: "session-load", usage: "unverified", steering: "unsupported", followUp: "controller-queue",
     artifacts: "references-pending",
     extensionRequests: ["cursor/ask_question", "cursor/create_plan", "cursor/update_todos", "cursor/task", "cursor/generate_image"],
-    extensionNotifications: ["cursor/update_todos", "cursor/task", "cursor/generate_image"],
+    extensionNotifications: ["cursor/update_todos", "cursor/task", "cursor/generate_image", "cursor/subagent_update"],
   },
   copilot: {
     displayName: "GitHub Copilot", qualification: "pending", models: "explicit-provider-verified",
diff --git a/packages/paperclip-runner/src/drivers/acpx/profile-extensions.ts b/packages/paperclip-runner/src/drivers/acpx/profile-extensions.ts
index 070088aab86..ad275b9dc15 100644
--- a/packages/paperclip-runner/src/drivers/acpx/profile-extensions.ts
+++ b/packages/paperclip-runner/src/drivers/acpx/profile-extensions.ts
@@ -1,3 +1,4 @@
+import { createCursorProfileExtensionAdapter, CURSOR_CLIENT_CAPABILITIES } from "./cursor-extensions.js";
 import type { HarnessRuntimeRequestResolution } from "../../contracts/harness-driver.js";
 import { parsePaperclipQuestionSet, type PaperclipQuestionSet } from "../../contracts/question-set.js";
 import { isCanonicalProviderEventType, type CanonicalProviderEvent } from "../../provider-events.js";
@@ -33,13 +34,14 @@ export interface AcpxProfileExtensionContext {
 
 /** Provider branches install their closed, pinned adapters here after qualification research. */
 export function createAcpxProfileExtensionAdapter(
-  _agent: QualifiedAcpxAgent,
-  _context: AcpxProfileExtensionContext,
+  agent: QualifiedAcpxAgent,
+  context: AcpxProfileExtensionContext,
 ): AcpxProfileExtensionAdapter | null {
+  if (agent === "cursor") return createCursorProfileExtensionAdapter(context);
   return null;
 }
-export function acpxProfileClientCapabilities(_agent: QualifiedAcpxAgent): Record<string, unknown> {
-  return {};
+export function acpxProfileClientCapabilities(agent: QualifiedAcpxAgent): Record<string, unknown> {
+  return agent === "cursor" ? structuredClone(CURSOR_CLIENT_CAPABILITIES) : {};
 }
 
 /** Reject an oversized approval document; never silently approve a truncated revision. */
diff --git a/packages/paperclip-runner/src/drivers/acpx/profile-installation.ts b/packages/paperclip-runner/src/drivers/acpx/profile-installation.ts
index a78aa47c6c5..4ac92c30880 100644
--- a/packages/paperclip-runner/src/drivers/acpx/profile-installation.ts
+++ b/packages/paperclip-runner/src/drivers/acpx/profile-installation.ts
@@ -1,8 +1,11 @@
+import { verifyCursorInstallation } from "./cursor-installation.js";
+import { assertCursorWorkspacePolicy } from "./cursor-launch-policy.js";
 import type { QualifiedAcpxAgent, QualifiedAcpxProfile } from "./qualified-profiles.js";
 import { verifyQualifiedAcpxInstallation, type VerifiedAcpxInstallation } from "./installation-integrity.js";
 
 /** Closed build-owned registry. Provider branches add their pinned installations here. */
 export async function verifyAcpxProfileInstallation(profile: QualifiedAcpxProfile): Promise<VerifiedAcpxInstallation> {
+  if (profile.agent === "cursor") return verifyCursorInstallation(profile);
   if (profile.agent !== "claude" && profile.agent !== "codex" && profile.agent !== "grok") {
     throw new Error(`ACPX ${profile.agent} verified candidate distribution is not installed in this build`);
   }
@@ -10,7 +13,9 @@ export async function verifyAcpxProfileInstallation(profile: QualifiedAcpxProfil
 }
 
 /** Provider policy admission is repeated immediately before each process launch. */
-export async function assertAcpxProfileWorkspace(_agent: QualifiedAcpxAgent, _workspace: string): Promise<void> {}
+export async function assertAcpxProfileWorkspace(agent: QualifiedAcpxAgent, workspace: string): Promise<void> {
+  if (agent === "cursor") await assertCursorWorkspacePolicy(workspace);
+}
 
 /** Candidate branches validate only explicitly bound, sanitized launch credentials. */
 export function assertAcpxProfileEnvironment(_agent: QualifiedAcpxAgent, _environment: Readonly<NodeJS.ProcessEnv>): void {}