diff --git a/.changeset/fix-expert-scope-versioned-keys.md b/.changeset/fix-expert-scope-versioned-keys.md
new file mode 100644
index 00000000..bc9cb9ce
--- /dev/null
+++ b/.changeset/fix-expert-scope-versioned-keys.md
@@ -0,0 +1,8 @@
+---
+"perstack": patch
+"create-expert": patch
+"@perstack/runtime": patch
+"@perstack/core": patch
+---
+
+Fix getExpertScope to strip @version/@tag suffix from coordinator keys, preventing false "out-of-scope delegate" validation errors for versioned expert keys
diff --git a/packages/core/src/schemas/expert.test.ts b/packages/core/src/schemas/expert.test.ts
index 7146eb3e..125dccd1 100644
--- a/packages/core/src/schemas/expert.test.ts
+++ b/packages/core/src/schemas/expert.test.ts
@@ -153,4 +153,38 @@ describe("@perstack/core: expertSchema", () => {
       }),
     ).toThrow(ZodError)
   })
+
+  it("accepts valid delegation with versioned keys", () => {
+    const result = expertSchema.parse({
+      key: "game-producer@1.0.0",
+      name: "game-producer",
+      version: "1.0.0",
+      instruction: "Test instruction",
+      delegates: ["@game-producer/designer@1.0.0"],
+    })
+    expect(result.delegates).toEqual(["@game-producer/designer@1.0.0"])
+  })
+
+  it("accepts valid delegation with tagged keys (draft ref)", () => {
+    const result = expertSchema.parse({
+      key: "weather-reporter@lho140o3ie8b",
+      name: "weather-reporter",
+      version: "0.0.0",
+      instruction: "Test instruction",
+      delegates: ["@weather-reporter/data-fetcher@lho140o3ie8b"],
+    })
+    expect(result.delegates).toEqual(["@weather-reporter/data-fetcher@lho140o3ie8b"])
+  })
+
+  it("rejects out-of-scope delegation with versioned keys", () => {
+    expect(() =>
+      expertSchema.parse({
+        key: "game-producer@1.0.0",
+        name: "game-producer",
+        version: "1.0.0",
+        instruction: "Test instruction",
+        delegates: ["@other-scope/expert@1.0.0"],
+      }),
+    ).toThrow(ZodError)
+  })
 })
diff --git a/packages/core/src/utils/expert-type.test.ts b/packages/core/src/utils/expert-type.test.ts
index b10234fa..4135fc24 100644
--- a/packages/core/src/utils/expert-type.test.ts
+++ b/packages/core/src/utils/expert-type.test.ts
@@ -31,6 +31,18 @@ describe("getExpertScope", () => {
   it("extracts scope from delegate name", () => {
     expect(getExpertScope("@game-producer/designer")).toBe("game-producer")
   })
+
+  it("strips version suffix from coordinator key", () => {
+    expect(getExpertScope("game-producer@1.0.0")).toBe("game-producer")
+  })
+
+  it("strips tag suffix from coordinator key", () => {
+    expect(getExpertScope("game-producer@lho140o3ie8b")).toBe("game-producer")
+  })
+
+  it("extracts scope from versioned delegate key", () => {
+    expect(getExpertScope("@game-producer/designer@1.0.0")).toBe("game-producer")
+  })
 })
 
 describe("getExpertShortName", () => {
@@ -41,6 +53,14 @@ describe("getExpertShortName", () => {
   it("extracts short name from delegate name", () => {
     expect(getExpertShortName("@game-producer/designer")).toBe("designer")
   })
+
+  it("strips version suffix from coordinator key", () => {
+    expect(getExpertShortName("game-producer@1.0.0")).toBe("game-producer")
+  })
+
+  it("strips version suffix from delegate key", () => {
+    expect(getExpertShortName("@game-producer/designer@1.0.0")).toBe("designer")
+  })
 })
 
 describe("validateDelegation", () => {
@@ -62,6 +82,28 @@ describe("validateDelegation", () => {
     })
   })
 
+  describe("valid cases with versioned keys", () => {
+    it("versioned coordinator -> versioned own scope delegate", () => {
+      expect(validateDelegation("game-producer@1.0.0", "@game-producer/designer@1.0.0")).toBeNull()
+    })
+
+    it("versioned coordinator -> versioned other coordinator", () => {
+      expect(validateDelegation("game-producer@1.0.0", "other-coordinator@2.0.0")).toBeNull()
+    })
+
+    it("versioned delegate -> versioned sibling delegate", () => {
+      expect(
+        validateDelegation("@game-producer/designer@1.0.0", "@game-producer/programmer@1.0.0"),
+      ).toBeNull()
+    })
+
+    it("tagged coordinator -> tagged own scope delegate", () => {
+      expect(
+        validateDelegation("game-producer@draft-ref-id", "@game-producer/designer@draft-ref-id"),
+      ).toBeNull()
+    })
+  })
+
   describe("invalid cases", () => {
     it("self-delegation (coordinator)", () => {
       expect(validateDelegation("game-producer", "game-producer")).toBe(
@@ -93,6 +135,20 @@ describe("validateDelegation", () => {
       )
     })
   })
+
+  describe("invalid cases with versioned keys", () => {
+    it("versioned coordinator -> versioned out-of-scope delegate", () => {
+      expect(validateDelegation("game-producer@1.0.0", "@other-scope/expert@1.0.0")).toBe(
+        'Expert "game-producer@1.0.0" cannot delegate to out-of-scope delegate "@other-scope/expert@1.0.0"',
+      )
+    })
+
+    it("versioned delegate -> versioned own coordinator", () => {
+      expect(validateDelegation("@game-producer/designer@1.0.0", "game-producer@1.0.0")).toBe(
+        'Delegate "@game-producer/designer@1.0.0" cannot delegate to its own coordinator "game-producer@1.0.0"',
+      )
+    })
+  })
 })
 
 describe("validateAllDelegations", () => {
diff --git a/packages/core/src/utils/expert-type.ts b/packages/core/src/utils/expert-type.ts
index 3de34291..b968219e 100644
--- a/packages/core/src/utils/expert-type.ts
+++ b/packages/core/src/utils/expert-type.ts
@@ -14,8 +14,11 @@ export function isDelegateExpert(expertName: string): boolean {
 
 /**
  * Returns the scope of an expert.
+ * Handles both bare names and versioned keys (with @version/@tag suffix).
  * - Coordinator "game-producer" -> "game-producer"
+ * - Coordinator "game-producer@1.0.0" -> "game-producer"
  * - Delegate "@game-producer/designer" -> "game-producer"
+ * - Delegate "@game-producer/designer@1.0.0" -> "game-producer"
  */
 export function getExpertScope(expertName: string): string {
   if (isDelegateExpert(expertName)) {
@@ -23,20 +26,27 @@ export function getExpertScope(expertName: string): string {
     const slashIndex = withoutAt.indexOf("/")
     return slashIndex === -1 ? withoutAt : withoutAt.slice(0, slashIndex)
   }
-  return expertName
+  const atIndex = expertName.indexOf("@")
+  return atIndex === -1 ? expertName : expertName.slice(0, atIndex)
 }
 
 /**
  * Returns the short name of an expert.
+ * Handles both bare names and versioned keys (with @version/@tag suffix).
  * - Coordinator "game-producer" -> "game-producer"
+ * - Coordinator "game-producer@1.0.0" -> "game-producer"
  * - Delegate "@game-producer/designer" -> "designer"
+ * - Delegate "@game-producer/designer@1.0.0" -> "designer"
  */
 export function getExpertShortName(expertName: string): string {
   if (isDelegateExpert(expertName)) {
     const slashIndex = expertName.indexOf("/")
-    return slashIndex === -1 ? expertName : expertName.slice(slashIndex + 1)
+    const shortName = slashIndex === -1 ? expertName : expertName.slice(slashIndex + 1)
+    const atIndex = shortName.indexOf("@")
+    return atIndex === -1 ? shortName : shortName.slice(0, atIndex)
   }
-  return expertName
+  const atIndex = expertName.indexOf("@")
+  return atIndex === -1 ? expertName : expertName.slice(0, atIndex)
 }
 
 /**
@@ -64,7 +74,11 @@ export function validateDelegation(source: string, target: string): string | nul
   }
 
   // A delegate cannot delegate to its own coordinator
-  if (isDelegateExpert(source) && isCoordinatorExpert(target) && target === sourceScope) {
+  if (
+    isDelegateExpert(source) &&
+    isCoordinatorExpert(target) &&
+    getExpertScope(target) === sourceScope
+  ) {
     return `Delegate "${source}" cannot delegate to its own coordinator "${target}"`
   }