diff --git a/src/shared/index.ts b/src/shared/index.ts
index fce869512..39fcc18ea 100644
--- a/src/shared/index.ts
+++ b/src/shared/index.ts
@@ -64,3 +64,4 @@ export * from "./prompt-tools"
 export * from "./internal-initiator-marker"
 export * from "./plugin-command-discovery"
 export { SessionCategoryRegistry } from "./session-category-registry"
+export * from "./plugin-identity"
diff --git a/src/shared/plugin-identity.test.ts b/src/shared/plugin-identity.test.ts
new file mode 100644
index 000000000..e727d5134
--- /dev/null
+++ b/src/shared/plugin-identity.test.ts
@@ -0,0 +1,89 @@
+import { describe, it, expect } from "bun:test"
+import {
+  PLUGIN_NAME,
+  LEGACY_PLUGIN_NAME,
+  CONFIG_BASENAME,
+  LEGACY_CONFIG_BASENAME,
+  LOG_FILENAME,
+  CACHE_DIR_NAME,
+  LEGACY_CACHE_DIR_NAME,
+} from "./plugin-identity"
+
+describe("plugin-identity constants", () => {
+  describe("PLUGIN_NAME", () => {
+    it("equals oh-my-openagent", () => {
+      // given
+
+      // when
+
+      // then
+      expect(PLUGIN_NAME).toBe("oh-my-openagent")
+    })
+  })
+
+  describe("LEGACY_PLUGIN_NAME", () => {
+    it("equals oh-my-opencode", () => {
+      // given
+
+      // when
+
+      // then
+      expect(LEGACY_PLUGIN_NAME).toBe("oh-my-opencode")
+    })
+  })
+
+  describe("CONFIG_BASENAME", () => {
+    it("equals oh-my-openagent", () => {
+      // given
+
+      // when
+
+      // then
+      expect(CONFIG_BASENAME).toBe("oh-my-openagent")
+    })
+  })
+
+  describe("LEGACY_CONFIG_BASENAME", () => {
+    it("equals oh-my-opencode", () => {
+      // given
+
+      // when
+
+      // then
+      expect(LEGACY_CONFIG_BASENAME).toBe("oh-my-opencode")
+    })
+  })
+
+  describe("LOG_FILENAME", () => {
+    it("equals oh-my-openagent.log", () => {
+      // given
+
+      // when
+
+      // then
+      expect(LOG_FILENAME).toBe("oh-my-openagent.log")
+    })
+  })
+
+  describe("CACHE_DIR_NAME", () => {
+    it("equals oh-my-openagent", () => {
+      // given
+
+      // when
+
+      // then
+      expect(CACHE_DIR_NAME).toBe("oh-my-openagent")
+    })
+  })
+
+  describe("LEGACY_CACHE_DIR_NAME", () => {
+    it("equals oh-my-opencode", () => {
+      // given
+
+      // when
+
+      // then
+      expect(LEGACY_CACHE_DIR_NAME).toBe("oh-my-opencode")
+    })
+  })
+})
diff --git a/src/shared/plugin-identity.ts b/src/shared/plugin-identity.ts
new file mode 100644
index 000000000..7a87587e0
--- /dev/null
+++ b/src/shared/plugin-identity.ts
@@ -0,0 +1,7 @@
+export const PLUGIN_NAME = "oh-my-openagent"
+export const LEGACY_PLUGIN_NAME = "oh-my-opencode"
+export const CONFIG_BASENAME = "oh-my-openagent"
+export const LEGACY_CONFIG_BASENAME = "oh-my-opencode"
+export const LOG_FILENAME = "oh-my-openagent.log"
+export const CACHE_DIR_NAME = "oh-my-openagent"
+export const LEGACY_CACHE_DIR_NAME = "oh-my-opencode"