diff --git a/src/shared/migration/agent-names.test.ts b/src/shared/migration/agent-names.test.ts
new file mode 100644
index 000000000..c68d59499
--- /dev/null
+++ b/src/shared/migration/agent-names.test.ts
@@ -0,0 +1,100 @@
+/// <reference types="bun-types" />
+
+import { describe, expect, test } from "bun:test"
+import { AGENT_NAME_MAP, migrateAgentNames } from "./agent-names"
+
+describe("AGENT_NAME_MAP parenthesized aliases", () => {
+  test("maps Sisyphus (Ultraworker) to sisyphus", () => {
+    // given
+    const alias = "Sisyphus (Ultraworker)"
+
+    // when
+    const result = AGENT_NAME_MAP[alias]
+
+    // then
+    expect(result).toBe("sisyphus")
+  })
+
+  test("maps Hephaestus (Deep Agent) to hephaestus", () => {
+    // given
+    const alias = "Hephaestus (Deep Agent)"
+
+    // when
+    const result = AGENT_NAME_MAP[alias]
+
+    // then
+    expect(result).toBe("hephaestus")
+  })
+
+  test("maps Prometheus (Plan Builder) to prometheus", () => {
+    // given
+    const alias = "Prometheus (Plan Builder)"
+
+    // when
+    const result = AGENT_NAME_MAP[alias]
+
+    // then
+    expect(result).toBe("prometheus")
+  })
+
+  test("maps Atlas (Plan Executor) to atlas", () => {
+    // given
+    const alias = "Atlas (Plan Executor)"
+
+    // when
+    const result = AGENT_NAME_MAP[alias]
+
+    // then
+    expect(result).toBe("atlas")
+  })
+
+  test("maps Metis (Plan Consultant) to metis", () => {
+    // given
+    const alias = "Metis (Plan Consultant)"
+
+    // when
+    const result = AGENT_NAME_MAP[alias]
+
+    // then
+    expect(result).toBe("metis")
+  })
+
+  test("maps Momus (Plan Critic) to momus", () => {
+    // given
+    const alias = "Momus (Plan Critic)"
+
+    // when
+    const result = AGENT_NAME_MAP[alias]
+
+    // then
+    expect(result).toBe("momus")
+  })
+})
+
+describe("migrateAgentNames with parenthesized aliases", () => {
+  test("migrates all parenthesized aliases to canonical names", () => {
+    // given
+    const legacyAgents = {
+      "Sisyphus (Ultraworker)": { model: "claude-opus-4" },
+      "Hephaestus (Deep Agent)": { model: "gpt-5.4" },
+      "Prometheus (Plan Builder)": { model: "claude-opus-4" },
+      "Atlas (Plan Executor)": { model: "kimi-k2.5" },
+      "Metis (Plan Consultant)": { model: "claude-opus-4" },
+      "Momus (Plan Critic)": { model: "claude-opus-4" },
+    }
+
+    // when
+    const { migrated, changed } = migrateAgentNames(legacyAgents)
+
+    // then
+    expect(changed).toBe(true)
+    expect(migrated.sisyphus).toEqual({ model: "claude-opus-4" })
+    expect(migrated.hephaestus).toEqual({ model: "gpt-5.4" })
+    expect(migrated.prometheus).toEqual({ model: "claude-opus-4" })
+    expect(migrated.atlas).toEqual({ model: "kimi-k2.5" })
+    expect(migrated.metis).toEqual({ model: "claude-opus-4" })
+    expect(migrated.momus).toEqual({ model: "claude-opus-4" })
+    expect(migrated["Sisyphus (Ultraworker)"]).toBeUndefined()
+    expect(migrated["Hephaestus (Deep Agent)"]).toBeUndefined()
+  })
+})
diff --git a/src/shared/migration/agent-names.ts b/src/shared/migration/agent-names.ts
index 67b9e1dbe..d3c10fff0 100644
--- a/src/shared/migration/agent-names.ts
+++ b/src/shared/migration/agent-names.ts
@@ -3,28 +3,36 @@ export const AGENT_NAME_MAP: Record<string, string> = {
   omo: "sisyphus",
   OmO: "sisyphus",
   Sisyphus: "sisyphus",
+  "Sisyphus (Ultraworker)": "sisyphus",
   sisyphus: "sisyphus",
 
+  // Hephaestus variants → "hephaestus"
+  "Hephaestus (Deep Agent)": "hephaestus",
+
   // Prometheus variants → "prometheus"
   "OmO-Plan": "prometheus",
   "omo-plan": "prometheus",
   "Planner-Sisyphus": "prometheus",
   "planner-sisyphus": "prometheus",
   "Prometheus - Plan Builder": "prometheus",
+  "Prometheus (Plan Builder)": "prometheus",
   prometheus: "prometheus",
 
   // Atlas variants → "atlas"
   "orchestrator-sisyphus": "atlas",
   Atlas: "atlas",
+  "Atlas (Plan Executor)": "atlas",
   atlas: "atlas",
 
   // Metis variants → "metis"
   "plan-consultant": "metis",
   "Metis - Plan Consultant": "metis",
+  "Metis (Plan Consultant)": "metis",
   metis: "metis",
 
   // Momus variants → "momus"
   "Momus - Plan Critic": "momus",
+  "Momus (Plan Critic)": "momus",
   momus: "momus",
 
   // Sisyphus-Junior → "sisyphus-junior"