diff --git a/CHANGELOG.md b/CHANGELOG.md
index 104b02f..3e6107e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,7 +11,16 @@ The project publishes 0.x prerelease versions; a stable release line is not yet
 
 - Migrate GitHub repository, Release, issue, badge, and raw-content coordinates
   to the canonical `bytefolk` organization while retaining the published npm
-  scope, MCP identity, and existing cache paths.
+  scope and the existing cache paths.
+- Follow the registry identifier after that rename: `mcpName` becomes
+  `io.github.bytefolk/mem-mcp`, because the official MCP Registry namespace is
+  derived from the repository owner and the previous value, naming the
+  organization this repository used to belong to, cannot resolve. The npm
+  package name and the installer's cache directory are deliberately unchanged,
+  so an existing installation keeps working and keeps its cache.
+  `npm/registry-identity.test.js` now asserts the identifier against the
+  repository coordinate the installer itself uses, so the next rename cannot
+  leave a stale identifier behind unnoticed.
 
 ### Security
 
diff --git a/npm/install.js b/npm/install.js
index 55dcf41..4215cc7 100644
--- a/npm/install.js
+++ b/npm/install.js
@@ -792,6 +792,7 @@ module.exports = {
   isLockContention,
   openResponse,
   releaseAssetLock,
+  REPO,
   sha256File,
   verifyFile,
 };
diff --git a/npm/package.json b/npm/package.json
index 9481628..235e2ee 100644
--- a/npm/package.json
+++ b/npm/package.json
@@ -2,7 +2,7 @@
   "name": "@fullstack-ai-infra/mem-mcp",
   "version": "0.1.1",
   "description": "MCP server for mem — a portable, self-hosted memory plane for AI agents",
-  "mcpName": "io.github.fullstack-ai-infra/mem-mcp",
+  "mcpName": "io.github.bytefolk/mem-mcp",
   "keywords": [
     "mcp",
     "model-context-protocol",
@@ -27,7 +27,7 @@
   "os": ["linux", "darwin", "win32"],
   "cpu": ["x64", "arm64"],
   "scripts": {
-    "test": "node --test install.test.js mem-mcp.test.js windows-shim.test.js",
+    "test": "node --test install.test.js mem-mcp.test.js registry-identity.test.js windows-shim.test.js",
     "test:tarball": "node --test clean-tarball.test.js"
   },
   "files": [
diff --git a/npm/registry-identity.test.js b/npm/registry-identity.test.js
new file mode 100644
index 0000000..298e161
--- /dev/null
+++ b/npm/registry-identity.test.js
@@ -0,0 +1,60 @@
+"use strict";
+
+const assert = require("node:assert/strict");
+const { readFileSync } = require("node:fs");
+const { join } = require("node:path");
+const test = require("node:test");
+const { REPO } = require("./install");
+
+const serverManifest = JSON.parse(
+  readFileSync(join(__dirname, "server.json"), "utf8"),
+);
+const packageManifest = JSON.parse(
+  readFileSync(join(__dirname, "package.json"), "utf8"),
+);
+
+// The registry derives its namespace from the repository owner, so every rename
+// leaves the published identifier pointing at an organization that no longer
+// exists, and the submission is rejected with no hint that a stale string in a
+// manifest caused it. The repository coordinate is therefore asserted here
+// against the identifier the submission carries, rather than repeated in a
+// third file.
+test("the registry namespace follows the repository owner", () => {
+  const [owner] = REPO.split("/");
+  assert.match(REPO, /^[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\/[a-z0-9._-]+$/i);
+  for (const [label, manifest] of [
+    ["server.json", serverManifest],
+    ["package.json", packageManifest],
+  ]) {
+    assert.equal(
+      manifest.mcpName,
+      `io.github.${owner}/${serverManifest.name}`,
+      `${label} mcpName must carry the owner of the repository the installer downloads from (${REPO})`,
+    );
+  }
+});
+
+// Both manifests are published and read by different tools, so a disagreement
+// between them decides which one the validator saw rather than which one is right.
+test("both manifests name the same server", () => {
+  assert.equal(serverManifest.mcpName, packageManifest.mcpName);
+  assert.equal(serverManifest.version, packageManifest.version);
+});
+
+// A registry identifier is a primary key, so the npm scope is allowed to differ
+// from it while the package name is not allowed to drift from it: `mcpName`
+// ends in the unscoped package name by construction, and moving the package
+// without moving the identifier would silently fork the registry record.
+test("the registry name is the unscoped package name", () => {
+  const [, packageName] = packageManifest.name.split("/");
+  assert.equal(
+    serverManifest.mcpName.split("/").pop(),
+    packageName,
+    "the trailing segment of mcpName must be the published package name without its scope",
+  );
+  assert.equal(
+    serverManifest.name,
+    packageName,
+    "server.json name must match the published package name without its scope",
+  );
+});
diff --git a/npm/server.json b/npm/server.json
index f214f7a..aa3fd6e 100644
--- a/npm/server.json
+++ b/npm/server.json
@@ -1,5 +1,5 @@
 {
-  "mcpName": "io.github.fullstack-ai-infra/mem-mcp",
+  "mcpName": "io.github.bytefolk/mem-mcp",
   "name": "mem-mcp",
   "version": "0.1.1",
   "description": "MCP server for mem — a portable, self-hosted memory plane for AI agents",