diff --git a/docs/guide/rpc.md b/docs/guide/rpc.md
index 087fdce1..6a185a0c 100644
--- a/docs/guide/rpc.md
+++ b/docs/guide/rpc.md
@@ -231,6 +231,8 @@ declare module 'devframe' {
 
 For server→client calls invoked via `ctx.rpc.broadcast`, augment `DevframeRpcClientFunctions` the same way.
 
+Augment one of the canonical module specifiers where these interfaces live — `declare module 'devframe'` or `declare module 'devframe/types'` (the form `@devframes/hub` uses). A wrapper package that re-exports the interface under a renamed alias (e.g. `DevToolsRpcServerFunctions`) is a different declaration, so augmenting the alias no longer merges into the base interface.
+
 ## Static dumps
 
 For `static` functions, Devframe records the handler's output during `createBuild` and bakes it into the build:
diff --git a/packages/devframe/src/node/__tests__/host-agent.test.ts b/packages/devframe/src/node/__tests__/host-agent.test.ts
index ab8e1521..90379e23 100644
--- a/packages/devframe/src/node/__tests__/host-agent.test.ts
+++ b/packages/devframe/src/node/__tests__/host-agent.test.ts
@@ -2,11 +2,11 @@ import type { RpcFunctionDefinitionAnyWithContext } from '../../rpc/types'
 import type { DevframeNodeContext } from '../../types/context'
 import { describe, expect, it, vi } from 'vitest'
 import { DevframeAgentHost } from '../host-agent'
-import { RpcFunctionsHost } from '../host-functions'
+import { RpcFunctionsHostImpl } from '../host-functions'
 
 function createContext(): DevframeNodeContext {
   const ctx = {} as DevframeNodeContext
-  ctx.rpc = new RpcFunctionsHost(ctx)
+  ctx.rpc = new RpcFunctionsHostImpl(ctx)
   ctx.agent = new DevframeAgentHost(ctx)
   return ctx
 }
diff --git a/packages/devframe/src/node/__tests__/host-functions.test.ts b/packages/devframe/src/node/__tests__/host-functions.test.ts
index 396ddcc5..6c3d0c59 100644
--- a/packages/devframe/src/node/__tests__/host-functions.test.ts
+++ b/packages/devframe/src/node/__tests__/host-functions.test.ts
@@ -1,7 +1,8 @@
 import type { DevframeNodeContext } from 'devframe/types'
+import type { RpcFunctionsHost } from '../host-functions'
 import { defineRpcFunction } from 'devframe'
-import { describe, expect, it } from 'vitest'
-import { RpcFunctionsHost } from '../host-functions'
+import { describe, expect, expectTypeOf, it } from 'vitest'
+import { RpcFunctionsHostImpl } from '../host-functions'
 
 async function emptyHandler() { /* empty */ }
 const returnFirst = async () => 'first'
@@ -15,7 +16,7 @@ describe('rpcFunctionsHost', () => {
 
   describe('register() collision detection', () => {
     it('should register a new RPC function successfully', () => {
-      const host = new RpcFunctionsHost(mockContext)
+      const host = new RpcFunctionsHostImpl(mockContext)
       const fn = defineRpcFunction({
         name: 'test-function',
         type: 'action',
@@ -27,7 +28,7 @@ describe('rpcFunctionsHost', () => {
     })
 
     it('should throw error when registering duplicate RPC function ID', () => {
-      const host = new RpcFunctionsHost(mockContext)
+      const host = new RpcFunctionsHostImpl(mockContext)
       const fn1 = defineRpcFunction({
         name: 'duplicate-fn',
         type: 'action',
@@ -48,7 +49,7 @@ describe('rpcFunctionsHost', () => {
     })
 
     it('should include the duplicate ID in error message', () => {
-      const host = new RpcFunctionsHost(mockContext)
+      const host = new RpcFunctionsHostImpl(mockContext)
       const fn = defineRpcFunction({
         name: 'my-special-function',
         type: 'query',
@@ -64,7 +65,7 @@ describe('rpcFunctionsHost', () => {
 
   describe('update() existence validation', () => {
     it('should throw error when updating non-existent RPC function', () => {
-      const host = new RpcFunctionsHost(mockContext)
+      const host = new RpcFunctionsHostImpl(mockContext)
       const fn = defineRpcFunction({
         name: 'nonexistent',
         type: 'action',
@@ -79,7 +80,7 @@ describe('rpcFunctionsHost', () => {
     })
 
     it('should update existing RPC function successfully', () => {
-      const host = new RpcFunctionsHost(mockContext)
+      const host = new RpcFunctionsHostImpl(mockContext)
       const fn1 = defineRpcFunction({
         name: 'update-test',
         type: 'action',
@@ -100,7 +101,7 @@ describe('rpcFunctionsHost', () => {
     })
 
     it('should validate that update only works on existing entries', () => {
-      const host = new RpcFunctionsHost(mockContext)
+      const host = new RpcFunctionsHostImpl(mockContext)
 
       // Register one function
       host.register(defineRpcFunction({
@@ -131,7 +132,7 @@ describe('rpcFunctionsHost', () => {
 
   describe('broadcast() without rpc group', () => {
     it('should not throw in build mode', async () => {
-      const host = new RpcFunctionsHost({ mode: 'build' } as DevframeNodeContext)
+      const host = new RpcFunctionsHostImpl({ mode: 'build' } as DevframeNodeContext)
       await expect(host.broadcast({
         method: 'devframe:auth:revoked',
         args: [],
@@ -139,7 +140,7 @@ describe('rpcFunctionsHost', () => {
     })
 
     it('should not throw in dev mode when rpc group is not yet set', async () => {
-      const host = new RpcFunctionsHost({ mode: 'dev' } as DevframeNodeContext)
+      const host = new RpcFunctionsHostImpl({ mode: 'dev' } as DevframeNodeContext)
       await expect(host.broadcast({
         method: 'devframe:auth:revoked',
         args: [],
@@ -149,7 +150,7 @@ describe('rpcFunctionsHost', () => {
 
   describe('invokeLocal()', () => {
     it('should invoke a locally registered function', async () => {
-      const host = new RpcFunctionsHost(mockContext)
+      const host = new RpcFunctionsHostImpl(mockContext)
       host.register(defineRpcFunction({
         name: 'test:invoke-local',
         type: 'query',
@@ -162,8 +163,29 @@ describe('rpcFunctionsHost', () => {
     })
 
     it('should throw when invoking a missing local function', async () => {
-      const host = new RpcFunctionsHost(mockContext)
+      const host = new RpcFunctionsHostImpl(mockContext)
       await expect(host.invokeLocal('test:missing' as any)).rejects.toThrow('RPC function "test:missing" is not registered')
     })
   })
+
+  describe('public RpcFunctionsHost type', () => {
+    it('is the structural type that ctx.rpc satisfies', () => {
+      // The `RpcFunctionsHost` exported from `devframe/node` (this
+      // re-export) must be the exact same structural type as
+      // `DevframeNodeContext['rpc']`, so consumers can cast `ctx.rpc`
+      // to it without a TS2352 conversion error.
+      expectTypeOf<DevframeNodeContext['rpc']>().toEqualTypeOf<RpcFunctionsHost>()
+      expectTypeOf<DevframeNodeContext['rpc']>().toMatchTypeOf<RpcFunctionsHost>()
+    })
+
+    it('does not carry the impl-only @internal members', () => {
+      const rpc = {} as RpcFunctionsHost
+      // @ts-expect-error `_rpcGroup` is impl-only and must stay off the public type
+      void rpc._rpcGroup
+      // @ts-expect-error `_asyncStorage` is impl-only and must stay off the public type
+      void rpc._asyncStorage
+      // @ts-expect-error `_emitSessionDisconnected` is impl-only and must stay off the public type
+      void rpc._emitSessionDisconnected
+    })
+  })
 })
diff --git a/packages/devframe/src/node/__tests__/rpc-streaming.test.ts b/packages/devframe/src/node/__tests__/rpc-streaming.test.ts
index 26313c64..d3cdb804 100644
--- a/packages/devframe/src/node/__tests__/rpc-streaming.test.ts
+++ b/packages/devframe/src/node/__tests__/rpc-streaming.test.ts
@@ -9,20 +9,20 @@ import { getPort } from 'get-port-please'
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { WebSocket } from 'ws'
 
-import { RpcFunctionsHost } from '../host-functions'
+import { RpcFunctionsHostImpl } from '../host-functions'
 
 vi.stubGlobal('WebSocket', WebSocket)
 
 interface Harness {
   port: number
-  rpcHost: RpcFunctionsHost
+  rpcHost: RpcFunctionsHostImpl
   close: () => Promise<void>
 }
 
 async function bootHost(): Promise<Harness> {
   const port = await getPort({ host: '127.0.0.1', random: true })
   const mockContext = {} as DevframeNodeContext
-  const rpcHost = new RpcFunctionsHost(mockContext)
+  const rpcHost = new RpcFunctionsHostImpl(mockContext)
 
   const asyncStorage = new AsyncLocalStorage<any>()
 
diff --git a/packages/devframe/src/node/auth/revoke.ts b/packages/devframe/src/node/auth/revoke.ts
index 541505f0..235e099d 100644
--- a/packages/devframe/src/node/auth/revoke.ts
+++ b/packages/devframe/src/node/auth/revoke.ts
@@ -1,6 +1,6 @@
 import type { DevframeNodeContext } from 'devframe/types'
 import type { SharedState } from 'devframe/utils/shared-state'
-import type { RpcFunctionsHost } from '../host-functions'
+import type { RpcFunctionsHostImpl } from '../host-functions'
 import type { InternalAnonymousAuthStorage } from '../hub-internals/context'
 
 /**
@@ -13,7 +13,7 @@ export async function revokeActiveConnectionsForToken(
   context: DevframeNodeContext,
   token: string,
 ): Promise<void> {
-  const rpcHost = context.rpc as unknown as RpcFunctionsHost | undefined
+  const rpcHost = context.rpc as unknown as RpcFunctionsHostImpl | undefined
   if (!rpcHost?._rpcGroup)
     return
 
diff --git a/packages/devframe/src/node/context.ts b/packages/devframe/src/node/context.ts
index 4aa20263..426786c1 100644
--- a/packages/devframe/src/node/context.ts
+++ b/packages/devframe/src/node/context.ts
@@ -4,7 +4,7 @@ import { diagnostics as rpcDiagnostics } from '../rpc/diagnostics'
 import { diagnostics as devframeDiagnostics } from './diagnostics'
 import { DevframeAgentHost } from './host-agent'
 import { DevframeDiagnosticsHost } from './host-diagnostics'
-import { RpcFunctionsHost } from './host-functions'
+import { RpcFunctionsHostImpl } from './host-functions'
 import { DevframeServicesHostImpl } from './host-services'
 import { DevframeViewHost } from './host-views'
 import { BUILTIN_AGENT_RPC } from './rpc'
@@ -47,7 +47,7 @@ export async function createHostContext(options: CreateHostContextOptions): Prom
     scope: undefined!,
   } as unknown as DevframeNodeContext
 
-  const rpcHost = new RpcFunctionsHost(context)
+  const rpcHost = new RpcFunctionsHostImpl(context)
   const viewsHost = new DevframeViewHost(context)
   const diagnosticsHost = new DevframeDiagnosticsHost(context, [devframeDiagnostics, rpcDiagnostics])
   context.rpc = rpcHost
diff --git a/packages/devframe/src/node/host-functions.ts b/packages/devframe/src/node/host-functions.ts
index 6c5b8e33..8eea3c4b 100644
--- a/packages/devframe/src/node/host-functions.ts
+++ b/packages/devframe/src/node/host-functions.ts
@@ -9,7 +9,25 @@ import { createRpcStreamingServerHost } from './rpc-streaming'
 
 const debugBroadcast = createDebug('devframe:rpc:broadcast')
 
-export class RpcFunctionsHost extends RpcFunctionsCollectorBase<DevframeRpcServerFunctions, DevframeNodeContext> implements RpcFunctionsHostType {
+/**
+ * The public, structural shape of `ctx.rpc`. Re-exported from
+ * `devframe/types` so `import { RpcFunctionsHost } from 'devframe/node'`
+ * resolves to the exact same type as `DevframeNodeContext['rpc']` (and the
+ * `devframe` main entry) — free of the `@internal` implementation members
+ * carried by {@link RpcFunctionsHostImpl}.
+ */
+export type { RpcFunctionsHost } from 'devframe/types'
+
+/**
+ * Concrete implementation backing `ctx.rpc`. Internal: consumers should
+ * depend on the structural {@link RpcFunctionsHost} type, never this class.
+ * Its `@internal` members (`_rpcGroup`, `_asyncStorage`,
+ * `_emitSessionDisconnected`) are wired by `startHttpAndWs` and must not
+ * widen the public surface.
+ *
+ * @internal
+ */
+export class RpcFunctionsHostImpl extends RpcFunctionsCollectorBase<DevframeRpcServerFunctions, DevframeNodeContext> implements RpcFunctionsHostType {
   /**
    * @internal
    */
diff --git a/packages/devframe/src/node/index.ts b/packages/devframe/src/node/index.ts
index c904d4f2..69867f47 100644
--- a/packages/devframe/src/node/index.ts
+++ b/packages/devframe/src/node/index.ts
@@ -2,7 +2,10 @@
 export * from './context'
 export * from './host-agent'
 export * from './host-diagnostics'
-export * from './host-functions'
+// `RpcFunctionsHostImpl` stays internal; expose only the structural
+// `RpcFunctionsHost` type so consumers can type/cast `ctx.rpc` without
+// pulling in the implementation's `@internal` members.
+export type { RpcFunctionsHost } from './host-functions'
 export * from './host-h3'
 export * from './host-services'
 export * from './host-views'
diff --git a/packages/devframe/src/node/server.ts b/packages/devframe/src/node/server.ts
index c5b00998..bd60745a 100644
--- a/packages/devframe/src/node/server.ts
+++ b/packages/devframe/src/node/server.ts
@@ -4,7 +4,7 @@ import type { NodeAdapter } from 'crossws/adapters/node'
 import type { ConnectionMeta, DevframeNodeContext, DevframeNodeRpcSession, DevframeNodeRpcSessionMeta, DevframeRpcClientFunctions, DevframeRpcServerFunctions } from 'devframe/types'
 import type { Server as NodeHttpServer } from 'node:http'
 import type { DevframeAuthHandler } from './auth'
-import type { RpcFunctionsHost } from './host-functions'
+import type { RpcFunctionsHostImpl } from './host-functions'
 import { AsyncLocalStorage } from 'node:async_hooks'
 import { createServer } from 'node:http'
 import { createRpcServer } from 'devframe/rpc/server'
@@ -143,7 +143,7 @@ export async function startHttpAndWs(options: StartHttpAndWsOptions): Promise<St
   // otherwise we own a fresh one bound to `app`.
   const ownsHttpServer = !options.server
   const httpServer = options.server ?? createServer(toNodeHandler(app))
-  const rpcHost = context.rpc as unknown as RpcFunctionsHost
+  const rpcHost = context.rpc as unknown as RpcFunctionsHostImpl
 
   const asyncStorage = new AsyncLocalStorage<DevframeNodeRpcSession>()
 
diff --git a/tests/__snapshots__/tsnapi/devframe/node.snapshot.d.ts b/tests/__snapshots__/tsnapi/devframe/node.snapshot.d.ts
index 1b6ad6e2..64e82a9e 100644
--- a/tests/__snapshots__/tsnapi/devframe/node.snapshot.d.ts
+++ b/tests/__snapshots__/tsnapi/devframe/node.snapshot.d.ts
@@ -74,25 +74,14 @@ export declare class DevframeViewHost implements DevframeViewHost$1 {
   constructor(_: DevframeNodeContext);
   hostStatic(_: string, _: string): void;
 }
-export declare class RpcFunctionsHost extends RpcFunctionsCollectorBase<DevframeRpcServerFunctions, DevframeNodeContext> implements RpcFunctionsHost$1 {
-  _rpcGroup: BirpcGroup<DevframeRpcClientFunctions, DevframeRpcServerFunctions, false>;
-  _asyncStorage: AsyncLocalStorage<DevframeNodeRpcSession>;
-  constructor(_: DevframeNodeContext);
-  sharedState: RpcSharedStateHost;
-  streaming: RpcStreamingHost;
-  _emitSessionDisconnected(_: DevframeNodeRpcSessionMeta): void;
-  invokeLocal<T extends keyof DevframeRpcServerFunctions, Args extends Parameters<DevframeRpcServerFunctions[T]>>(_: T, ..._: Args): Promise<Awaited<ReturnType<DevframeRpcServerFunctions[T]>>>;
-  broadcast<T extends keyof DevframeRpcClientFunctions, Args extends Parameters<DevframeRpcClientFunctions[T]>>(_: RpcBroadcastOptions<T, Args>): Promise<void>;
-  getCurrentRpcSession(): DevframeNodeRpcSession | undefined;
-}
 // #endregion
 
 // #region Functions
 export declare function createH3DevframeHost(_: CreateH3DevframeHostOptions): DevframeHost;
 export declare function createHostContext(_: CreateHostContextOptions): Promise<DevframeNodeContext>;
 export declare function createNodeSettings<T extends Record<string, any> = Record<string, any>>(_: DevframeNodeContext, _: string): DevframeSettings<T>;
-export declare function createRpcSharedStateServerHost(_: RpcFunctionsHost$1): RpcSharedStateHost;
-export declare function createRpcStreamingServerHost(_: RpcFunctionsHost$1): RpcStreamingHost;
+export declare function createRpcSharedStateServerHost(_: RpcFunctionsHost): RpcSharedStateHost;
+export declare function createRpcStreamingServerHost(_: RpcFunctionsHost): RpcStreamingHost;
 export declare function createScopedNodeContext<NS extends string = string>(_: DevframeNodeContext, _: NS): DevframeScopedNodeContext<NS>;
 export declare function createStorage<T extends object>(_: CreateStorageOptions<T>): SharedState<T>;
 export declare function formatHostForUrl(_: string): string;
@@ -102,6 +91,7 @@ export declare function toDialableHost(_: string): string;
 // #endregion
 
 // #region Other
+export { RpcFunctionsHost }
 export { StartedServer }
 export { startHttpAndWs }
 export { StartHttpAndWsOptions }
diff --git a/tests/__snapshots__/tsnapi/devframe/node.snapshot.js b/tests/__snapshots__/tsnapi/devframe/node.snapshot.js
index 11afe678..a580513e 100644
--- a/tests/__snapshots__/tsnapi/devframe/node.snapshot.js
+++ b/tests/__snapshots__/tsnapi/devframe/node.snapshot.js
@@ -16,7 +16,6 @@ export { DevframeViewHost }
 export { formatHostForUrl }
 export { isObject }
 export { normalizeHttpServerUrl }
-export { RpcFunctionsHost }
 export { startHttpAndWs }
 export { toDialableHost }
 // #endregion
\ No newline at end of file