diff --git a/src/shared/bundled-notify-ownership.test.ts b/src/shared/bundled-notify-ownership.test.ts
index 0690a86a1..0881e5802 100644
--- a/src/shared/bundled-notify-ownership.test.ts
+++ b/src/shared/bundled-notify-ownership.test.ts
@@ -83,6 +83,19 @@ describe("ensureBundledNotifyOwnership", () => {
     expect(readConfig(userConfigPath).plugin).toEqual(["oh-my-openagent", canonicalEntry])
   })
 
+  test("rewrites recognized npm-prefixed external notify with version to bundled owner", () => {
+    // given
+    const userConfigPath = join(userConfigDir, "opencode.json")
+    writeFileSync(userConfigPath, JSON.stringify({ plugin: ["npm:kdco/notify@1.2.3", "oh-my-openagent"] }, null, 2) + "\n")
+
+    // when
+    const result = ensureBundledNotifyOwnership({ projectDirectory: projectDir, packageRoot })
+
+    // then
+    expect(result.changedUserConfig).toBe(true)
+    expect(readConfig(userConfigPath).plugin).toEqual(["oh-my-openagent", canonicalEntry])
+  })
+
   test("rewrites recognized tuple notify in user config when tuple options are empty", () => {
     // given
     const userConfigPath = join(userConfigDir, "opencode.json")
@@ -150,6 +163,19 @@ describe("ensureBundledNotifyOwnership", () => {
     expect(readConfig(userConfigPath).plugin).toEqual(["alias@npm:@custom/opencode-notify@1.2.3", "oh-my-openagent"])
   })
 
+  test("fails loudly for npm alias string spec targeting recognized kdco/notify package", () => {
+    // given
+    const userConfigPath = join(userConfigDir, "opencode.json")
+    writeFileSync(userConfigPath, JSON.stringify({ plugin: ["alias@npm:kdco/notify@1.2.3", "oh-my-openagent"] }, null, 2) + "\n")
+
+    // when
+    const run = () => ensureBundledNotifyOwnership({ projectDirectory: projectDir, packageRoot })
+
+    // then
+    expect(run).toThrow("Unsafe external notify plugin ownership detected")
+    expect(readConfig(userConfigPath).plugin).toEqual(["alias@npm:kdco/notify@1.2.3", "oh-my-openagent"])
+  })
+
   test("fails loudly for npm alias tuple spec targeting custom opencode-notify package", () => {
     // given
     const userConfigPath = join(userConfigDir, "opencode.json")
@@ -166,6 +192,93 @@ describe("ensureBundledNotifyOwnership", () => {
     expect(readConfig(userConfigPath).plugin).toEqual([["alias@npm:@custom/opencode-notify@1.2.3", {}], "oh-my-openagent"])
   })
 
+  test("fails loudly for npm alias tuple spec targeting recognized kdco/notify package", () => {
+    // given
+    const userConfigPath = join(userConfigDir, "opencode.json")
+    writeFileSync(
+      userConfigPath,
+      JSON.stringify({ plugin: [["alias@npm:kdco/notify@1.2.3", {}], "oh-my-openagent"] }, null, 2) + "\n",
+    )
+
+    // when
+    const run = () => ensureBundledNotifyOwnership({ projectDirectory: projectDir, packageRoot })
+
+    // then
+    expect(run).toThrow("Unsafe external notify plugin ownership detected")
+    expect(readConfig(userConfigPath).plugin).toEqual([["alias@npm:kdco/notify@1.2.3", {}], "oh-my-openagent"])
+  })
+
+  test("fails loudly for non-exact recognized-like spec with nested npm alias in string form", () => {
+    // given
+    const userConfigPath = join(userConfigDir, "opencode.json")
+    writeFileSync(userConfigPath, JSON.stringify({ plugin: ["kdco/notify@npm:kdco/notify@1.2.3", "oh-my-openagent"] }, null, 2) + "\n")
+
+    // when
+    const run = () => ensureBundledNotifyOwnership({ projectDirectory: projectDir, packageRoot })
+
+    // then
+    expect(run).toThrow("Unsafe external notify plugin ownership detected")
+    expect(readConfig(userConfigPath).plugin).toEqual(["kdco/notify@npm:kdco/notify@1.2.3", "oh-my-openagent"])
+  })
+
+  test("fails loudly for non-exact recognized-like spec with nested npm alias in tuple form", () => {
+    // given
+    const userConfigPath = join(userConfigDir, "opencode.json")
+    writeFileSync(
+      userConfigPath,
+      JSON.stringify({ plugin: [["kdco/notify@npm:kdco/notify@1.2.3", {}], "oh-my-openagent"] }, null, 2) + "\n",
+    )
+
+    // when
+    const run = () => ensureBundledNotifyOwnership({ projectDirectory: projectDir, packageRoot })
+
+    // then
+    expect(run).toThrow("Unsafe external notify plugin ownership detected")
+    expect(readConfig(userConfigPath).plugin).toEqual([["kdco/notify@npm:kdco/notify@1.2.3", {}], "oh-my-openagent"])
+  })
+
+  test("fails loudly for recognized notify package with file source suffix in string form", () => {
+    // given
+    const userConfigPath = join(userConfigDir, "opencode.json")
+    writeFileSync(userConfigPath, JSON.stringify({ plugin: ["kdco/notify@file:../local", "oh-my-openagent"] }, null, 2) + "\n")
+
+    // when
+    const run = () => ensureBundledNotifyOwnership({ projectDirectory: projectDir, packageRoot })
+
+    // then
+    expect(run).toThrow("Unsafe external notify plugin ownership detected")
+    expect(readConfig(userConfigPath).plugin).toEqual(["kdco/notify@file:../local", "oh-my-openagent"])
+  })
+
+  test("fails loudly for recognized notify package with file source suffix in tuple form", () => {
+    // given
+    const userConfigPath = join(userConfigDir, "opencode.json")
+    writeFileSync(
+      userConfigPath,
+      JSON.stringify({ plugin: [["kdco/notify@file:../local", {}], "oh-my-openagent"] }, null, 2) + "\n",
+    )
+
+    // when
+    const run = () => ensureBundledNotifyOwnership({ projectDirectory: projectDir, packageRoot })
+
+    // then
+    expect(run).toThrow("Unsafe external notify plugin ownership detected")
+    expect(readConfig(userConfigPath).plugin).toEqual([["kdco/notify@file:../local", {}], "oh-my-openagent"])
+  })
+
+  test("fails loudly for npm-prefixed recognized notify package with workspace source suffix", () => {
+    // given
+    const userConfigPath = join(userConfigDir, "opencode.json")
+    writeFileSync(userConfigPath, JSON.stringify({ plugin: ["npm:kdco/notify@workspace:*", "oh-my-openagent"] }, null, 2) + "\n")
+
+    // when
+    const run = () => ensureBundledNotifyOwnership({ projectDirectory: projectDir, packageRoot })
+
+    // then
+    expect(run).toThrow("Unsafe external notify plugin ownership detected")
+    expect(readConfig(userConfigPath).plugin).toEqual(["npm:kdco/notify@workspace:*", "oh-my-openagent"])
+  })
+
   test("migrates stale bundled dist/opencode-notify file URL to canonical bundled entry", () => {
     // given
     const userConfigPath = join(userConfigDir, "opencode.json")
diff --git a/src/shared/bundled-notify-ownership.ts b/src/shared/bundled-notify-ownership.ts
index 8b3f6732b..d77456333 100644
--- a/src/shared/bundled-notify-ownership.ts
+++ b/src/shared/bundled-notify-ownership.ts
@@ -63,7 +63,30 @@ function isPathLikePluginEntry(entry: string): boolean {
 
 function isRecognizedExternalNotifyId(entry: string): boolean {
   const normalized = entry.trim().toLowerCase()
-  return KNOWN_EXTERNAL_NOTIFY_IDS.some((base) => normalized === base || normalized.startsWith(`${base}@`))
+
+  return KNOWN_EXTERNAL_NOTIFY_IDS.some((base) => {
+    if (normalized === base) return true
+    if (!normalized.startsWith(`${base}@`)) return false
+
+    const versionSuffix = normalized.slice(base.length + 1)
+    if (versionSuffix.length === 0) return false
+    if (versionSuffix.includes("@")) return false
+    if (versionSuffix.includes("://")) return false
+    if (versionSuffix.includes(":")) return false
+    if (versionSuffix.includes("/")) return false
+    if (versionSuffix.includes("\\")) return false
+
+    return /^[a-z0-9.*+!~^<>=| -]+$/i.test(versionSuffix)
+  })
+}
+
+function isRecognizedNotifyIdWithUnsupportedSuffix(entry: string): boolean {
+  const normalized = entry.trim().toLowerCase()
+
+  return KNOWN_EXTERNAL_NOTIFY_IDS.some((base) => {
+    if (!normalized.startsWith(`${base}@`)) return false
+    return !isRecognizedExternalNotifyId(normalized)
+  })
 }
 
 function stripNpmPrefix(entry: string): string {
@@ -97,6 +120,18 @@ function extractPackageIdentifierFromSpec(entry: string): string | null {
   return stripVersionSuffix(packageSpec)
 }
 
+function isAliasedRecognizedNotifyTarget(entry: string): boolean {
+  const normalized = stripNpmPrefix(entry.trim().toLowerCase())
+  const aliasSeparatorIndex = normalized.indexOf("@npm:")
+  if (aliasSeparatorIndex <= 0) return false
+
+  const aliasedTargetSpec = normalized.slice(aliasSeparatorIndex + "@npm:".length)
+  if (aliasedTargetSpec.length === 0) return false
+
+  const aliasedPackageIdentifier = stripVersionSuffix(stripNpmPrefix(aliasedTargetSpec))
+  return aliasedPackageIdentifier === "kdco/notify"
+}
+
 function isCustomPackageNotifyCandidate(entry: string): boolean {
   const packageIdentifier = extractPackageIdentifierFromSpec(entry)
   if (!packageIdentifier) return false
@@ -173,6 +208,24 @@ function classifyPluginEntry(entry: OpenCodePluginEntry, index: number, canonica
       }
     }
 
+    if (isRecognizedNotifyIdWithUnsupportedSuffix(entry)) {
+      return {
+        kind: "unsafe-external",
+        entry,
+        index,
+        reason: "recognized notify package uses unsupported source/custom suffix",
+      }
+    }
+
+    if (isAliasedRecognizedNotifyTarget(entry)) {
+      return {
+        kind: "unsafe-external",
+        entry,
+        index,
+        reason: "aliased kdco/notify entries are treated as custom notify owners",
+      }
+    }
+
     if (isCustomPackageNotifyCandidate(entry)) {
       return {
         kind: "unsafe-external",
@@ -221,6 +274,24 @@ function classifyPluginEntry(entry: OpenCodePluginEntry, index: number, canonica
     }
   }
 
+  if (isRecognizedNotifyIdWithUnsupportedSuffix(tupleKey)) {
+    return {
+      kind: "unsafe-external",
+      entry,
+      index,
+      reason: "recognized notify package uses unsupported source/custom suffix",
+    }
+  }
+
+  if (isAliasedRecognizedNotifyTarget(tupleKey)) {
+    return {
+      kind: "unsafe-external",
+      entry,
+      index,
+      reason: "aliased kdco/notify entries are treated as custom notify owners",
+    }
+  }
+
   if (isCustomPackageNotifyCandidate(tupleKey)) {
     return {
       kind: "unsafe-external",