fix: use -i flag for GitHub Copilot CLI prompt injection (#799)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/renderer/src/components/settings/general-search.ts

@@ -82,7 +82,7 @@ export const GENERAL_AGENT_SEARCH_ENTRIES: SettingsSearchEntry[] = [
   {
     title: 'Default Agent',
     description: 'Pre-select an AI coding agent in the new-workspace composer.',
-    keywords: ['agent', 'default', 'claude', 'codex', 'opencode', 'pi', 'gemini', 'aider']
+    keywords: ['agent', 'default', 'claude', 'codex', 'opencode', 'pi', 'gemini', 'aider', 'copilot']
   }
 ]
 

src/renderer/src/lib/agent-catalog.tsx

@@ -173,6 +173,13 @@ export const AGENT_CATALOG: AgentCatalogEntry[] = [
     cmd: 'hermes',
     faviconDomain: 'nousresearch.com',
     homepageUrl: 'https://hermes-agent.nousresearch.com/docs/'
+  },
+  {
+    id: 'copilot',
+    label: 'GitHub Copilot',
+    cmd: 'copilot',
+    faviconDomain: 'github.com',
+    homepageUrl: 'https://docs.github.com/en/copilot/how-tos/set-up/install-copilot-cli'
   }
 ]
 

src/renderer/src/lib/tui-agent-startup.test.ts

@@ -77,7 +77,7 @@ describe('buildAgentStartupPlan', () => {
     })
   })
 
-  it('passes Copilot prompts with the --prompt flag', () => {
+  it('passes Copilot prompts with the -i flag for an interactive session', () => {
     expect(
       buildAgentStartupPlan({
         agent: 'copilot',
@@ -86,7 +86,7 @@ describe('buildAgentStartupPlan', () => {
         platform: 'darwin'
       })
     ).toEqual({
-      launchCommand: "copilot --prompt 'Fix the bug'",
+      launchCommand: "copilot -i 'Fix the bug'",
       expectedProcess: 'copilot',
       followupPrompt: null
     })
@@ -102,6 +102,21 @@ describe('buildAgentStartupPlan', () => {
       })
     ).toBeNull()
   })
+
+  it('uses -i flag for copilot to start an interactive session with initial prompt', () => {
+    expect(
+      buildAgentStartupPlan({
+        agent: 'copilot',
+        prompt: 'Fix the bug',
+        cmdOverrides: {},
+        platform: 'darwin'
+      })
+    ).toEqual({
+      launchCommand: "copilot -i 'Fix the bug'",
+      expectedProcess: 'copilot',
+      followupPrompt: null
+    })
+  })
 })
 
 describe('isShellProcess', () => {

src/renderer/src/lib/tui-agent-startup.ts

@@ -55,6 +55,14 @@ export function buildAgentStartupPlan(args: {
     }
   }
 
+  if (config.promptInjectionMode === 'flag-interactive') {
+    return {
+      launchCommand: `${baseCommand} -i ${quotedPrompt}`,
+      expectedProcess: config.expectedProcess,
+      followupPrompt: null
+    }
+  }
+
   return {
     launchCommand: baseCommand,
     expectedProcess: config.expectedProcess,

src/shared/tui-agent-config.ts

@@ -4,6 +4,7 @@ export type AgentPromptInjectionMode =
   | 'argv'
   | 'flag-prompt'
   | 'flag-prompt-interactive'
+  | 'flag-interactive'
   | 'stdin-after-start'
 
 export type TuiAgentConfig = {
@@ -156,6 +157,10 @@ export const TUI_AGENT_CONFIG: Record<TuiAgent, TuiAgentConfig> = {
     detectCmd: 'copilot',
     launchCmd: 'copilot',
     expectedProcess: 'copilot',
-    promptInjectionMode: 'flag-prompt'
+    // Why: `copilot --prompt <text>` runs non-interactively and exits on
+    // completion, which would kill the TUI session Orca is hosting.
+    // `-i/--interactive <prompt>` starts an interactive session with the
+    // initial prompt pre-executed — the behavior Orca needs.
+    promptInjectionMode: 'flag-interactive'
   }
 }