diff --git a/README.md b/README.md
index 5405d61..b6273a9 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
-# HiveCast SDK
+# Matrix SDK
 
-HiveCast SDK is the package-author layer for building Matrix actors, browser
+Matrix SDK is the package-author layer for building Matrix actors, browser
 surfaces, and broker-connected applications without depending on a managed
 platform repo.
 
@@ -19,7 +19,7 @@ packed tarballs.
 - Browser host integrations for Matrix web surfaces
 - Package-author CLIs and project scaffolds
 
-HiveCast SDK is provider-neutral. It does not require a managed platform account,
+Matrix SDK is provider-neutral. It does not require a managed platform account,
 device-link ceremony, host-link implementation, managed host service, local
 platform install, Postgres database, or provider-owned broker authority. A
 provider overlay can issue broker credentials and host runtimes on top of the
@@ -33,7 +33,7 @@ part of the package-author SDK proof.
 
 | Package | Purpose |
 | --- | --- |
-| `@open-matrix/hivecast-sdk` | Public umbrella facade for actor/package authors |
+| `@open-matrix/sdk` | Public umbrella facade for actor/package authors |
 | `@open-matrix/core` | Actor kernel, runtime, transports, serialization, browser actor base classes |
 | `@open-matrix/cli` | Package-author `matrix` CLI |
 | `@open-matrix/browser-kit` | Browser app shims, theme tokens, Vite helpers, shell components |
@@ -51,14 +51,14 @@ import { MatrixActor } from '@open-matrix/core';
 Use the umbrella package when you intentionally want the public SDK facade:
 
 ```ts
-import { MatrixActor } from '@open-matrix/hivecast-sdk';
+import { MatrixActor } from '@open-matrix/sdk';
 ```
 
 ## Quick Start
 
 ```bash
-git clone https://registry.hivecast.ai/open-matrix/hivecast-sdk.git
-cd hivecast-sdk
+git clone git@github.com:matrix-sdk/matrix-sdk.git
+cd matrix-sdk
 pnpm install --frozen-lockfile
 pnpm prove
 ```
@@ -212,7 +212,7 @@ Done and proven:
 
 - The SDK packages build independently from their original source monorepo.
 - Package identities use final `@open-matrix/*` names.
-- `@open-matrix/hivecast-sdk` re-exports the public actor facade.
+- `@open-matrix/sdk` re-exports the public actor facade.
 - A fresh clone passes `pnpm install --frozen-lockfile && pnpm prove`.
 - A temporary external consumer can install packed SDK tarballs, compile, start
   a `MatrixActor`, and call it through Matrix runtime/transport.
@@ -232,7 +232,7 @@ must be added as an explicit release policy before any npm publication.
 
 ## Relationship To Provider Overlays
 
-HiveCast SDK is the provider-neutral actor SDK.
+Matrix SDK is the provider-neutral actor SDK.
 
 Provider overlays can provide account management, namespaces, API keys, broker
 credential issuance, runtime hosting, package distribution, and operator UI.
diff --git a/STANDALONE-AUDIT.md b/STANDALONE-AUDIT.md
index 0344934..662949a 100644
--- a/STANDALONE-AUDIT.md
+++ b/STANDALONE-AUDIT.md
@@ -2,7 +2,7 @@
 
 Date: 2026-06-07
 
-This repository is intended to be a standalone HiveCast SDK repository. The SDK
+This repository is intended to be a standalone Matrix SDK repository. The SDK
 packages must be usable without the HiveCast application monorepo, without
 Matrix-3 path assumptions, and without platform-only concepts such as Device
 Link, Host Link, system-auth, or gateway internals.
diff --git a/examples/hivecast-login/run-demo.mjs b/examples/hivecast-login/run-demo.mjs
index 143fabe..63333c8 100644
--- a/examples/hivecast-login/run-demo.mjs
+++ b/examples/hivecast-login/run-demo.mjs
@@ -82,7 +82,7 @@ if (checkOnly) {
 
 const demoHome = process.env.MATRIX_DEMO_HOME
   ? resolve(process.env.MATRIX_DEMO_HOME)
-  : mkdtempSync(join(tmpdir(), 'hivecast-sdk-login.'));
+  : mkdtempSync(join(tmpdir(), 'matrix-sdk-hivecast-login.'));
 const keep = process.env.MATRIX_DEMO_KEEP === '1' || Boolean(process.env.MATRIX_DEMO_HOME);
 
 try {
diff --git a/examples/standalone-greeter/matrix.json b/examples/standalone-greeter/matrix.json
index 402172b..fd6bf2b 100644
--- a/examples/standalone-greeter/matrix.json
+++ b/examples/standalone-greeter/matrix.json
@@ -1,5 +1,5 @@
 {
-  "name": "hivecast-sdk-example-standalone-greeter",
+  "name": "matrix-sdk-example-standalone-greeter",
   "version": "0.0.0",
   "runtime": {
     "language": "typescript",
diff --git a/examples/standalone-greeter/package.json b/examples/standalone-greeter/package.json
index 7039051..e6ff173 100644
--- a/examples/standalone-greeter/package.json
+++ b/examples/standalone-greeter/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "hivecast-sdk-example-standalone-greeter",
+  "name": "matrix-sdk-example-standalone-greeter",
   "version": "0.0.0",
   "private": true,
   "type": "module",
diff --git a/examples/standalone-greeter/run-demo.mjs b/examples/standalone-greeter/run-demo.mjs
index 3625017..a3bc63d 100644
--- a/examples/standalone-greeter/run-demo.mjs
+++ b/examples/standalone-greeter/run-demo.mjs
@@ -74,7 +74,7 @@ let runner;
 
 try {
   run('pnpm', ['run', 'build']);
-  run('pnpm', ['--filter', 'hivecast-sdk-example-standalone-greeter', 'run', 'build']);
+  run('pnpm', ['--filter', 'matrix-sdk-example-standalone-greeter', 'run', 'build']);
 
   runner = spawn(process.execPath, [
     matrixCli, 'run', demoDir,
diff --git a/package.json b/package.json
index 43eb7ca..88f7677 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "hivecast-sdk-workspace",
+  "name": "matrix-sdk-workspace",
   "version": "0.0.0",
   "private": true,
   "type": "module",
diff --git a/packages/cli/README.md b/packages/cli/README.md
index 2fd7bb5..26301bc 100644
--- a/packages/cli/README.md
+++ b/packages/cli/README.md
@@ -1,6 +1,6 @@
 # @open-matrix/cli
 
-Package-author CLI for the HiveCast SDK layer.
+Package-author CLI for the Matrix SDK layer.
 
 This package owns the SDK/package-author `matrix` binary. It does not depend on
 provider overlay packages, managed host packages, platform system actors,
diff --git a/packages/cli/src/__tests__/cli.test.ts b/packages/cli/src/__tests__/cli.test.ts
index 2801b39..3bd842b 100644
--- a/packages/cli/src/__tests__/cli.test.ts
+++ b/packages/cli/src/__tests__/cli.test.ts
@@ -6,7 +6,7 @@ import test from 'node:test';
 import { main } from '../cli.js';
 
 test('init, add actor, and configure write package-local SDK state', async () => {
-  const root = await mkdtemp(join(tmpdir(), 'hivecast-sdk-cli-test.'));
+  const root = await mkdtemp(join(tmpdir(), 'matrix-sdk-cli-test.'));
 
   await main(['init', root, '--name', 'demo-package']);
   await main(['add', 'actor', 'greeter', '--dir', root, '--mount', 'demo.greeter']);
@@ -57,15 +57,15 @@ test('init, add actor, and configure write package-local SDK state', async () =>
 });
 
 test('up delegates a host-runnable package to an explicit managed host command', async () => {
-  const root = await mkdtemp(join(tmpdir(), 'hivecast-sdk-cli-up-test.'));
-  const testRuntimeHost = join(root, 'test-runtime-host.mjs');
+  const root = await mkdtemp(join(tmpdir(), 'matrix-sdk-cli-up-test.'));
+  const fakeRuntimeHost = join(root, 'fake-runtime-host.mjs');
   const calledPath = join(root, 'runtime-host-called.json');
 
   await main(['init', root, '--name', 'demo-package']);
   await main(['add', 'actor', 'greeter', '--dir', root, '--mount', 'demo.greeter']);
   await mkdir(join(root, 'dist'), { recursive: true });
   await writeFile(join(root, 'dist', 'index.js'), 'export function createStandaloneGreeterActor() {}\n', 'utf8');
-  await writeFile(testRuntimeHost, `
+  await writeFile(fakeRuntimeHost, `
 import { writeFileSync } from 'node:fs';
 writeFileSync(${JSON.stringify(calledPath)}, JSON.stringify({
   argv: process.argv.slice(2),
@@ -79,7 +79,7 @@ writeFileSync(${JSON.stringify(calledPath)}, JSON.stringify({
     '--key', 'test-key',
     '--cloud', 'https://example.invalid',
     '--space', 'demo-space',
-    '--runtime-host-bin', testRuntimeHost,
+    '--runtime-host-bin', fakeRuntimeHost,
     '--runtime-host-routing', 'workspace-source',
   ]);
   await main(['up', '--dir', root, '--json']);
@@ -91,7 +91,7 @@ writeFileSync(${JSON.stringify(calledPath)}, JSON.stringify({
 });
 
 test('add actor preserves explicit Actor class suffix', async () => {
-  const root = await mkdtemp(join(tmpdir(), 'hivecast-sdk-cli-actor-suffix-test.'));
+  const root = await mkdtemp(join(tmpdir(), 'matrix-sdk-cli-actor-suffix-test.'));
 
   await main(['init', root, '--name', 'demo-package']);
   await main(['add', 'actor', 'GreeterActor', '--dir', root, '--mount', 'demo.greeter']);
diff --git a/packages/core/package.json b/packages/core/package.json
index 0c37d42..5b201ce 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -7,7 +7,7 @@
   "license": "MIT",
   "repository": {
     "type": "git",
-    "url": "https://registry.hivecast.ai/open-matrix/hivecast-sdk.git",
+    "url": "https://github.com/matrix-sdk/matrix-sdk.git",
     "directory": "packages/core"
   },
   "keywords": [
diff --git a/packages/sdk/CONTRACT.md b/packages/sdk/CONTRACT.md
index ff0529a..d01f284 100644
--- a/packages/sdk/CONTRACT.md
+++ b/packages/sdk/CONTRACT.md
@@ -1,6 +1,6 @@
-# @open-matrix/hivecast-sdk Contract
+# @open-matrix/sdk Contract
 
-`@open-matrix/hivecast-sdk` is a package-author facade over the public SDK package set.
+`@open-matrix/sdk` is a package-author facade over the public SDK package set.
 
 It may export from the Node-safe root:
 
diff --git a/packages/sdk/README.md b/packages/sdk/README.md
index 457abf6..5e77567 100644
--- a/packages/sdk/README.md
+++ b/packages/sdk/README.md
@@ -1,6 +1,6 @@
-# @open-matrix/hivecast-sdk
+# @open-matrix/sdk
 
-Public HiveCast actor SDK facade for package authors.
+Public Matrix actor SDK facade for package authors.
 
 Prefer narrow package imports when a package only needs one layer:
 
@@ -12,5 +12,5 @@ Use this umbrella package when a package intentionally needs the combined actor,
 browser host, contracts, federation, and Omega kernel facade.
 
 Import browser app build utilities directly from `@open-matrix/browser-kit` so
-headless actor packages can import `@open-matrix/hivecast-sdk` without loading
+headless actor packages can import `@open-matrix/sdk` without loading
 browser-only custom element code.
diff --git a/packages/sdk/package.json b/packages/sdk/package.json
index 2715257..a6ef74b 100644
--- a/packages/sdk/package.json
+++ b/packages/sdk/package.json
@@ -1,7 +1,7 @@
 {
-  "name": "@open-matrix/hivecast-sdk",
+  "name": "@open-matrix/sdk",
   "version": "0.1.0",
-  "description": "Public HiveCast actor SDK facade for package authors.",
+  "description": "Public Matrix actor SDK facade for package authors.",
   "type": "module",
   "private": true,
   "main": "./dist/index.js",
diff --git a/scripts/clean.mjs b/scripts/clean.mjs
index f6dd41c..ae49fe5 100644
--- a/scripts/clean.mjs
+++ b/scripts/clean.mjs
@@ -31,7 +31,7 @@ for (const pkg of packages) {
     'open-matrix-browser-kit-0.1.0.tgz',
     'open-matrix-cli-0.1.0.tgz',
     'open-matrix-core-0.1.0.tgz',
-    'open-matrix-hivecast-sdk-0.1.0.tgz',
+    'open-matrix-sdk-0.1.0.tgz',
   ];
   for (const tarball of tarballs) {
     rmSync(join(pkgRoot, tarball), { force: true });
diff --git a/scripts/prove-external-consumer.mjs b/scripts/prove-external-consumer.mjs
index c827a3d..e0ccbbb 100644
--- a/scripts/prove-external-consumer.mjs
+++ b/scripts/prove-external-consumer.mjs
@@ -16,7 +16,7 @@ const packages = [
   '@open-matrix/core',
   '@open-matrix/browser-host',
   '@open-matrix/browser-kit',
-  '@open-matrix/hivecast-sdk',
+  '@open-matrix/sdk',
   '@open-matrix/cli',
 ];
 
@@ -70,7 +70,7 @@ async function assertNoSymlinkToHarness(dir) {
 }
 
 async function main() {
-  const proofRoot = await mkdtemp(path.join(tmpdir(), 'hivecast-sdk-consumer-proof.'));
+  const proofRoot = await mkdtemp(path.join(tmpdir(), 'matrix-sdk-consumer-proof.'));
   const tarballDir = path.join(proofRoot, 'tarballs');
   const consumerDir = path.join(proofRoot, 'consumer');
   let keep = process.env.MATRIX_SDK_KEEP_CONSUMER_PROOF === '1';
@@ -94,7 +94,7 @@ async function main() {
     );
 
     await writeFile(path.join(consumerDir, 'package.json'), JSON.stringify({
-      name: 'hivecast-sdk-external-consumer-proof',
+      name: 'matrix-sdk-external-consumer-proof',
       version: '0.0.0',
       private: true,
       type: 'module',
@@ -144,7 +144,7 @@ import {
   MatrixRuntime,
   TopicRouter,
 } from '@open-matrix/core';
-import { MatrixActor as SdkMatrixActor } from '@open-matrix/hivecast-sdk';
+import { MatrixActor as SdkMatrixActor } from '@open-matrix/sdk';
 
 class EchoActor extends MatrixActor {
   static accepts = {
diff --git a/scripts/prove-sdk-cli-uat.mjs b/scripts/prove-sdk-cli-uat.mjs
index 3cdd5fb..5356fbd 100644
--- a/scripts/prove-sdk-cli-uat.mjs
+++ b/scripts/prove-sdk-cli-uat.mjs
@@ -18,7 +18,7 @@ const packages = [
   '@open-matrix/core',
   '@open-matrix/browser-host',
   '@open-matrix/browser-kit',
-  '@open-matrix/hivecast-sdk',
+  '@open-matrix/sdk',
   '@open-matrix/cli',
 ];
 
@@ -157,7 +157,7 @@ async function createProofWorkspace(proofRoot) {
       copied: false,
     };
   }
-  const copiedWorkspace = path.join(proofRoot, 'hivecast-sdk-workspace');
+  const copiedWorkspace = path.join(proofRoot, 'matrix-sdk-workspace');
   await cp(sourceWorkspaceDir, copiedWorkspace, {
     recursive: true,
     dereference: false,
@@ -219,7 +219,7 @@ async function stopChild(child) {
 }
 
 async function main() {
-  const proofRoot = await mkdtemp(path.join(tmpdir(), 'hivecast-sdk-cli-uat.'));
+  const proofRoot = await mkdtemp(path.join(tmpdir(), 'matrix-sdk-cli-uat.'));
   const proofWorkspace = await createProofWorkspace(proofRoot);
   workspaceDir = proofWorkspace.workspaceDir;
   const tarballDir = path.join(proofRoot, 'tarballs');
@@ -271,7 +271,7 @@ async function main() {
     );
 
     await writeFile(path.join(toolingDir, 'package.json'), JSON.stringify({
-      name: 'hivecast-sdk-cli-uat-tooling',
+      name: 'matrix-sdk-cli-uat-tooling',
       version: '0.0.0',
       private: true,
       type: 'module',
@@ -424,7 +424,7 @@ async function main() {
     run('pnpm', ['pack', '--pack-destination', packageTarballDir], { cwd: authorDir, stdio: 'pipe' });
     const authorPackageTarball = await findOnlyTarball(packageTarballDir, 'generated author package');
     await writeFile(path.join(packageConsumerDir, 'package.json'), JSON.stringify({
-      name: 'hivecast-sdk-package-manager-consumer',
+      name: 'matrix-sdk-package-manager-consumer',
       version: '0.0.0',
       private: true,
       type: 'module',