diff --git a/src/main/runtime/rpc/methods/orchestration-inject-rejection-message.test.ts b/src/main/runtime/rpc/methods/orchestration-inject-rejection-message.test.ts
new file mode 100644
index 00000000000..a7ae03b00a8
--- /dev/null
+++ b/src/main/runtime/rpc/methods/orchestration-inject-rejection-message.test.ts
@@ -0,0 +1,31 @@
+import { describe, expect, it } from 'vitest'
+import { buildInjectRejectionMessage } from './orchestration-inject-rejection-message'
+import { TUI_AGENT_CONFIG } from '../../../../shared/tui-agent-config'
+import { recognizeAgentProcess } from '../../../../shared/agent-process-recognition'
+
+describe('buildInjectRejectionMessage', () => {
+  const message = buildInjectRejectionMessage('term_a')
+
+  it('keeps the substring callers and scripts match on', () => {
+    expect(message).toContain('Cannot dispatch --inject to terminal term_a')
+    expect(message).toContain('no recognized agent detected')
+  })
+
+  it('names every agent Orca recognizes, including agy', () => {
+    expect(message).toMatch(/\bagy\b/)
+    for (const config of Object.values(TUI_AGENT_CONFIG)) {
+      expect(message).toContain(config.expectedProcess)
+    }
+  })
+
+  it('lists only names detection actually resolves, deduped and sorted', () => {
+    const listed = (/\(([^)]+)\)/.exec(message)?.[1] ?? '').split(', ')
+
+    expect(listed.length).toBeGreaterThan(0)
+    expect(new Set(listed).size).toBe(listed.length)
+    expect([...listed].sort()).toEqual(listed)
+    for (const name of listed) {
+      expect(recognizeAgentProcess(name)).not.toBeNull()
+    }
+  })
+})
diff --git a/src/main/runtime/rpc/methods/orchestration-inject-rejection-message.ts b/src/main/runtime/rpc/methods/orchestration-inject-rejection-message.ts
new file mode 100644
index 00000000000..33d622ca80e
--- /dev/null
+++ b/src/main/runtime/rpc/methods/orchestration-inject-rejection-message.ts
@@ -0,0 +1,16 @@
+import { TUI_AGENT_CONFIG } from '../../../../shared/tui-agent-config'
+
+// Why: the old five-name example read as an allowlist (#15125); derive from the field detection keys on so it cannot drift.
+// Not filtered by `disabledTuiAgents` — that gates Orca's launchers, not detection, so a hand-started disabled agent still injects.
+const RECOGNIZED_AGENT_PROCESS_NAMES = [
+  ...new Set(Object.values(TUI_AGENT_CONFIG).map((config) => config.expectedProcess))
+].sort()
+
+export function buildInjectRejectionMessage(terminal: string): string {
+  return (
+    `Cannot dispatch --inject to terminal ${terminal}: no recognized agent detected. ` +
+    `Orca detects these agent CLIs (${RECOGNIZED_AGENT_PROCESS_NAMES.join(', ')}). ` +
+    'Start one in the terminal and let it finish launching, ' +
+    'or dispatch without --inject and send the prompt manually.'
+  )
+}
diff --git a/src/main/runtime/rpc/methods/orchestration-tasks-dispatch.test.ts b/src/main/runtime/rpc/methods/orchestration-tasks-dispatch.test.ts
index a7b6250595d..8c6c3156c52 100644
--- a/src/main/runtime/rpc/methods/orchestration-tasks-dispatch.test.ts
+++ b/src/main/runtime/rpc/methods/orchestration-tasks-dispatch.test.ts
@@ -3,6 +3,7 @@ import type { RpcContext } from '../core'
 import { createOrchestrationRpcHarness } from './orchestration-rpc-test-harness'
 import type { OrchestrationDb } from '../../orchestration/db'
 import type { OrcaRuntimeService } from '../../orca-runtime'
+import { buildInjectRejectionMessage } from './orchestration-inject-rejection-message'
 
 describe('orchestration RPC methods', () => {
   const h = createOrchestrationRpcHarness()
@@ -389,7 +390,7 @@ describe('orchestration RPC methods', () => {
           to: 'term_a',
           inject: true
         })
-      ).rejects.toThrow('no recognized agent detected')
+      ).rejects.toThrow(buildInjectRejectionMessage('term_a'))
     })
 
     it('rejects dispatch to occupied terminal', async () => {
diff --git a/src/main/runtime/rpc/methods/orchestration.ts b/src/main/runtime/rpc/methods/orchestration.ts
index 30e0b516129..b986fa25148 100644
--- a/src/main/runtime/rpc/methods/orchestration.ts
+++ b/src/main/runtime/rpc/methods/orchestration.ts
@@ -27,6 +27,7 @@ import {
   resolveBareOrchestrationRecipient,
   type SendRecipientWarning
 } from './orchestration-recipient-routing'
+import { buildInjectRejectionMessage } from './orchestration-inject-rejection-message'
 import { resolveRunScope } from './orchestration-run-scope'
 import { ORCHESTRATION_RUN_METHODS } from './orchestration-runs'
 import { ORCHESTRATION_WORKER_METHODS } from './orchestration-worker-methods'
@@ -1643,11 +1644,7 @@ export const ORCHESTRATION_METHODS: RpcMethod[] = [
       if (params.inject) {
         const hasAgent = await runtime.isTerminalRunningAgent(to)
         if (!hasAgent) {
-          throw new Error(
-            `Cannot dispatch --inject to terminal ${to}: no recognized agent detected. ` +
-              'Start an agent CLI (e.g. claude, codex, gemini, droid, cursor) in the terminal first, ' +
-              'or dispatch without --inject and send the prompt manually.'
-          )
+          throw new Error(buildInjectRejectionMessage(to))
         }
       }
 
diff --git a/src/shared/agent-process-recognition.test.ts b/src/shared/agent-process-recognition.test.ts
index 776c7bd5faf..015fb2964a1 100644
--- a/src/shared/agent-process-recognition.test.ts
+++ b/src/shared/agent-process-recognition.test.ts
@@ -360,6 +360,22 @@ describe('agent process recognition', () => {
     expect(isAgentForegroundWrapperProcess('vim.exe')).toBe(false)
   })
 
+  it('recognizes the Antigravity CLI from bare, POSIX and Windows command lines', () => {
+    const agy = { agent: 'antigravity', processName: 'agy' }
+
+    expect(recognizeAgentProcess('agy')).toEqual(agy)
+    expect(recognizeAgentProcess('/Users/dev/.local/bin/agy')).toEqual(agy)
+    expect(recognizeAgentProcess(String.raw`C:\Users\dev\AppData\Local\agy\bin\agy.exe`)).toEqual(
+      agy
+    )
+    expect(
+      recognizeAgentProcessFromCommandLine(
+        String.raw`"C:\Users\dev\AppData\Local\agy\bin\agy.exe" --dangerously-skip-permissions`
+      )
+    ).toEqual(agy)
+    expect(recognizeAgentProcessFromCommandLine('agy --dangerously-skip-permissions')).toEqual(agy)
+  })
+
   it('recognizes versioned Grok process names observed from the installed CLI', () => {
     expect(recognizeAgentProcess('grok-0.2.51')).toEqual({
       agent: 'grok',