fix(agents): use list display names for ordered agent config

src/shared/agent-display-names.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from "bun:test"
-import { AGENT_DISPLAY_NAMES, getAgentDisplayName, getAgentConfigKey } from "./agent-display-names"
+import { AGENT_DISPLAY_NAMES, getAgentConfigKey, getAgentDisplayName, getAgentListDisplayName, normalizeAgentForPrompt } from "./agent-display-names"
 
 describe("getAgentDisplayName", () => {
   it("returns display name for lowercase config key (new format)", () => {
@@ -174,6 +174,26 @@ describe("getAgentConfigKey", () => {
     expect(getAgentConfigKey("Momus (Plan Critic)")).toBe("momus")
     expect(getAgentConfigKey("Sisyphus-Junior")).toBe("sisyphus-junior")
   })
+
+  it("resolves atlas even when the UI ordering prefix is present", () => {
+    expect(getAgentConfigKey(getAgentListDisplayName("atlas"))).toBe("atlas")
+  })
+})
+
+describe("getAgentListDisplayName", () => {
+  it("keeps sisyphus unchanged for list display", () => {
+    expect(getAgentListDisplayName("sisyphus")).toBe("Sisyphus (Ultraworker)")
+  })
+
+  it("applies invisible atlas sort prefix for list display", () => {
+    expect(getAgentListDisplayName("atlas")).toBe("\u200BAtlas (Plan Executor)")
+  })
+})
+
+describe("normalizeAgentForPrompt", () => {
+  it("strips atlas UI ordering prefix back to canonical display name", () => {
+    expect(normalizeAgentForPrompt(getAgentListDisplayName("atlas"))).toBe("Atlas (Plan Executor)")
+  })
 })
 
 describe("AGENT_DISPLAY_NAMES", () => {
@@ -200,4 +220,4 @@ describe("AGENT_DISPLAY_NAMES", () => {
     // then contains all expected mappings
     expect(AGENT_DISPLAY_NAMES).toEqual(expectedMappings)
   })
-})
+})

src/shared/agent-display-names.ts

@@ -20,6 +20,14 @@ export const AGENT_DISPLAY_NAMES: Record<string, string> = {
   "council-member": "council-member",
 }
 
+const AGENT_LIST_SORT_PREFIXES: Record<string, string> = {
+  atlas: "\u200B",
+}
+
+function stripAgentListSortPrefix(agentName: string): string {
+  return agentName.replace(/^\u200B+/, "")
+}
+
 /**
  * Get display name for an agent config key.
  * Uses case-insensitive lookup for backward compatibility.
@@ -40,6 +48,13 @@ export function getAgentDisplayName(configKey: string): string {
   return configKey
 }
 
+export function getAgentListDisplayName(configKey: string): string {
+  const displayName = getAgentDisplayName(configKey)
+  const prefix = AGENT_LIST_SORT_PREFIXES[configKey.toLowerCase()]
+
+  return prefix ? `${prefix}${displayName}` : displayName
+}
+
 const REVERSE_DISPLAY_NAMES: Record<string, string> = Object.fromEntries(
   Object.entries(AGENT_DISPLAY_NAMES).map(([key, displayName]) => [displayName.toLowerCase(), key]),
 )
@@ -49,7 +64,7 @@ const REVERSE_DISPLAY_NAMES: Record<string, string> = Object.fromEntries(
  * "Atlas (Plan Executor)" → "atlas", "atlas" → "atlas", "unknown" → "unknown"
  */
 export function getAgentConfigKey(agentName: string): string {
-  const lower = agentName.toLowerCase()
+  const lower = stripAgentListSortPrefix(agentName).toLowerCase()
   const reversed = REVERSE_DISPLAY_NAMES[lower]
   if (reversed !== undefined) return reversed
   if (AGENT_DISPLAY_NAMES[lower] !== undefined) return lower
@@ -67,7 +82,7 @@ export function normalizeAgentForPrompt(agentName: string | undefined): string |
     return undefined
   }
 
-  const trimmed = agentName.trim()
+  const trimmed = stripAgentListSortPrefix(agentName.trim())
   if (!trimmed) {
     return undefined
   }