diff --git a/src/main/runtime/rpc/dispatcher-computer-errors.test.ts b/src/main/runtime/rpc/dispatcher-computer-errors.test.ts
index 862973e3913..bbc37e57ab1 100644
--- a/src/main/runtime/rpc/dispatcher-computer-errors.test.ts
+++ b/src/main/runtime/rpc/dispatcher-computer-errors.test.ts
@@ -1,4 +1,4 @@
-import { describe, expect, it } from 'vitest'
+import { describe, expect, it, vi } from 'vitest'
 import { z } from 'zod'
 import { RpcDispatcher } from './dispatcher'
 import { defineMethod, InvalidArgumentError, type RpcRequest } from './core'
@@ -37,6 +37,20 @@ const METHODS = [
     handler: () => {
       throw new InvalidArgumentError('Async validation rejected payload')
     }
+  }),
+  defineMethod({
+    name: 'orchestration.inspectCaller',
+    params: z.object({}),
+    handler: (_params, { authenticatedCallerFingerprint }) => ({
+      authenticatedCallerFingerprint
+    })
+  }),
+  defineMethod({
+    name: 'orchestration.federationInspectCaller',
+    params: z.object({}),
+    handler: (_params, { authenticatedCallerFingerprint }) => ({
+      authenticatedCallerFingerprint
+    })
   })
 ]
 
@@ -109,12 +123,16 @@ describe('RpcDispatcher computer-use validation errors', () => {
     })
   })
 
-  it('maps async validation errors to invalid_argument without shadowing Zod formatting', async () => {
+  it('maps async validation errors over streaming transport without shadowing Zod formatting', async () => {
+    const messages: string[] = []
     const dispatcher = new RpcDispatcher({ runtime: makeRuntime(), methods: METHODS })
 
-    const response = await dispatcher.dispatch(makeRequest('orchestration.invalidArgument', {}))
+    await dispatcher.dispatchStreaming(
+      makeRequest('orchestration.invalidArgument', {}),
+      (message) => messages.push(message)
+    )
 
-    expect(response).toMatchObject({
+    expect(JSON.parse(messages[0]!)).toMatchObject({
       ok: false,
       error: {
         code: 'invalid_argument',
@@ -122,4 +140,35 @@ describe('RpcDispatcher computer-use validation errors', () => {
       }
     })
   })
+
+  it('forwards a paired caller fingerprint without requiring local orchestration state', async () => {
+    const dispatcher = new RpcDispatcher({ runtime: makeRuntime(), methods: METHODS })
+
+    const response = await dispatcher.dispatch(makeRequest('orchestration.inspectCaller', {}), {
+      authenticatedCallerFingerprint: 'paired-caller'
+    })
+
+    expect(response).toMatchObject({
+      ok: true,
+      result: { authenticatedCallerFingerprint: 'paired-caller' }
+    })
+  })
+
+  it('provides local identity to read-only federation authorization', async () => {
+    const getOrCreateLocalMutationCallerFingerprint = vi.fn(() => 'local-caller')
+    const runtime = Object.assign(makeRuntime(), {
+      getOrchestrationDb: () => ({ getOrCreateLocalMutationCallerFingerprint })
+    })
+    const dispatcher = new RpcDispatcher({ runtime, methods: METHODS })
+
+    const response = await dispatcher.dispatch(
+      makeRequest('orchestration.federationInspectCaller', {})
+    )
+
+    expect(response).toMatchObject({
+      ok: true,
+      result: { authenticatedCallerFingerprint: 'local-caller' }
+    })
+    expect(getOrCreateLocalMutationCallerFingerprint).toHaveBeenCalledOnce()
+  })
 })
diff --git a/src/main/runtime/rpc/dispatcher.ts b/src/main/runtime/rpc/dispatcher.ts
index b86b30f7c52..7e7ef60f6fb 100644
--- a/src/main/runtime/rpc/dispatcher.ts
+++ b/src/main/runtime/rpc/dispatcher.ts
@@ -10,6 +10,7 @@ import {
 } from './core'
 
 import type { FeatureInteractionId } from '../../../shared/feature-interactions'
+import { isOrchestrationMutation } from '../../../shared/orchestration-rpc-contract'
 import { errorResponse, successResponse } from './errors'
 import { ALL_RPC_METHODS } from './methods'
 import { emulatorProbe, emulatorProbeError } from '../../emulator/emulator-probe'
@@ -93,7 +94,7 @@ export class RpcDispatcher {
       )
       const authenticatedCallerFingerprint =
         options?.authenticatedCallerFingerprint ??
-        (request.method.startsWith('orchestration.')
+        (needsLocalCallerFingerprint(request, effectiveParams)
           ? this.orchestrationMutations.getLocalAuthenticatedCallerFingerprint()
           : undefined)
       const invoke = (mutation?: DurableMutationInvocation) => {
@@ -186,7 +187,7 @@ export class RpcDispatcher {
         )
         const authenticatedCallerFingerprint =
           options?.authenticatedCallerFingerprint ??
-          (request.method.startsWith('orchestration.')
+          (needsLocalCallerFingerprint(request, effectiveParams)
             ? this.orchestrationMutations.getLocalAuthenticatedCallerFingerprint()
             : undefined)
         const invoke = (mutation?: DurableMutationInvocation) => {
@@ -303,3 +304,10 @@ export class RpcDispatcher {
     return { runtimeId: this.runtime.getRuntimeId() }
   }
 }
+
+function needsLocalCallerFingerprint(request: RpcRequest, params: unknown): boolean {
+  return (
+    request.method.startsWith('orchestration.federation') ||
+    (!!request.orchestrationRequestId && isOrchestrationMutation(request.method, params))
+  )
+}