diff --git a/runtime/src/main/java/org/capnproto/CallContextHook.java b/runtime/src/main/java/org/capnproto/CallContextHook.java
new file mode 100644
index 0000000..c5aa043
--- /dev/null
+++ b/runtime/src/main/java/org/capnproto/CallContextHook.java
@@ -0,0 +1,19 @@
+package org.capnproto;
+
+import java.util.concurrent.CompletableFuture;
+
+public interface CallContextHook {
+    AnyPointer.Reader getParams();
+
+    void releaseParams();
+
+    AnyPointer.Builder getResults();
+
+    CompletableFuture<java.lang.Void> tailCall(RequestHook request);
+
+    void allowCancellation();
+
+    CompletableFuture<PipelineHook> onTailCall();
+
+    ClientHook.VoidPromiseAndPipeline directTailCall(RequestHook request);
+}
diff --git a/runtime/src/main/java/org/capnproto/ClientHook.java b/runtime/src/main/java/org/capnproto/ClientHook.java
index bda1eaf..8e8ad8d 100644
--- a/runtime/src/main/java/org/capnproto/ClientHook.java
+++ b/runtime/src/main/java/org/capnproto/ClientHook.java
@@ -1,18 +1,35 @@
 package org.capnproto;
 
+import java.util.concurrent.CompletableFuture;
+
 public interface ClientHook {
 
     Object NULL_CAPABILITY_BRAND = new Object();
     Object BROKEN_CAPABILITY_BRAND = new Object();
 
+    Request<AnyPointer.Builder, AnyPointer.Reader> newCall(long interfaceId, short methodId);
+
+    VoidPromiseAndPipeline call(long interfaceId, short methodId, CallContextHook context);
+
     default ClientHook getResolved() {
         return null;
     }
 
+    default CompletableFuture<ClientHook> whenMoreResolved() {
+        return null;
+    }
+
     default Object getBrand() {
         return NULL_CAPABILITY_BRAND;
     }
 
+    default CompletableFuture<java.lang.Void> whenResolved() {
+        var promise = whenMoreResolved();
+        return promise != null
+                ? promise.thenCompose(ClientHook::whenResolved)
+                : CompletableFuture.completedFuture(null);
+    }
+
     default boolean isNull() {
         return getBrand() == NULL_CAPABILITY_BRAND;
     }
@@ -25,6 +42,16 @@ public interface ClientHook {
         return null;
     }
 
+    final class VoidPromiseAndPipeline {
+        public final CompletableFuture<java.lang.Void> promise;
+        public final PipelineHook pipeline;
+
+        VoidPromiseAndPipeline(CompletableFuture<java.lang.Void> promise, PipelineHook pipeline) {
+            this.promise = promise;
+            this.pipeline = pipeline;
+        }
+    }
+
     static ClientHook newBrokenCap(String reason) {
         return newBrokenClient(reason, false, BROKEN_CAPABILITY_BRAND);
     }
@@ -43,6 +70,25 @@ public interface ClientHook {
 
     static private ClientHook newBrokenClient(Throwable exc, boolean resolved, Object brand) {
         return new ClientHook() {
+            @Override
+            public Request<AnyPointer.Builder, AnyPointer.Reader> newCall(long interfaceId, short methodId) {
+                return Request.newBrokenRequest(exc);
+            }
+
+            @Override
+            public VoidPromiseAndPipeline call(long interfaceId, short methodId, CallContextHook context) {
+                return new VoidPromiseAndPipeline(CompletableFuture.failedFuture(exc), null);
+            }
+
+            @Override
+            public CompletableFuture<ClientHook> whenMoreResolved() {
+                if (resolved) {
+                    return null;
+                } else {
+                    return CompletableFuture.failedFuture(exc);
+                }
+            }
+
             @Override
             public Object getBrand() {
                 return brand;
diff --git a/runtime/src/main/java/org/capnproto/PipelineHook.java b/runtime/src/main/java/org/capnproto/PipelineHook.java
new file mode 100644
index 0000000..d242f2d
--- /dev/null
+++ b/runtime/src/main/java/org/capnproto/PipelineHook.java
@@ -0,0 +1,10 @@
+package org.capnproto;
+
+interface PipelineHook {
+
+    ClientHook getPipelinedCap(PipelineOp[] ops);
+
+    static PipelineHook newBrokenPipeline(Throwable exc) {
+        return ops -> ClientHook.newBrokenCap(exc);
+    }
+}
diff --git a/runtime/src/main/java/org/capnproto/PipelineOp.java b/runtime/src/main/java/org/capnproto/PipelineOp.java
new file mode 100644
index 0000000..5232d30
--- /dev/null
+++ b/runtime/src/main/java/org/capnproto/PipelineOp.java
@@ -0,0 +1,25 @@
+package org.capnproto;
+
+final class PipelineOp {
+
+    enum Type {
+        NOOP,
+        GET_POINTER_FIELD
+    }
+
+    final PipelineOp.Type type;
+    final short pointerIndex;
+
+    private PipelineOp(PipelineOp.Type type, short pointerIndex) {
+        this.type = type;
+        this.pointerIndex = pointerIndex;
+    }
+
+    static PipelineOp Noop() {
+        return new PipelineOp(Type.NOOP, (short) 0);
+    }
+
+    static PipelineOp PointerField(short pointerIndex) {
+        return new PipelineOp(Type.GET_POINTER_FIELD, pointerIndex);
+    }
+}
diff --git a/runtime/src/main/java/org/capnproto/RemotePromise.java b/runtime/src/main/java/org/capnproto/RemotePromise.java
new file mode 100644
index 0000000..9664942
--- /dev/null
+++ b/runtime/src/main/java/org/capnproto/RemotePromise.java
@@ -0,0 +1,22 @@
+package org.capnproto;
+
+import java.util.concurrent.CompletableFuture;
+
+class RemotePromise<Results> {
+
+    final CompletableFuture<Response> response;
+    final PipelineHook pipeline;
+
+    RemotePromise(CompletableFuture<Response> response, PipelineHook pipeline) {
+        this.response = response;
+        this.pipeline = pipeline;
+    }
+
+    public CompletableFuture<Response> getResponse() {
+        return response;
+    }
+
+    public PipelineHook getHook() {
+        return pipeline;
+    }
+}
diff --git a/runtime/src/main/java/org/capnproto/Request.java b/runtime/src/main/java/org/capnproto/Request.java
new file mode 100644
index 0000000..bedc248
--- /dev/null
+++ b/runtime/src/main/java/org/capnproto/Request.java
@@ -0,0 +1,42 @@
+package org.capnproto;
+
+import java.util.concurrent.CompletableFuture;
+
+public class Request<Params, Results> {
+
+    private final AnyPointer.Builder params;
+    private final RequestHook hook;
+
+    Request(AnyPointer.Builder params, RequestHook hook) {
+        this.params = params;
+        this.hook = hook;
+    }
+
+    AnyPointer.Builder params() {
+        return params;
+    }
+
+    CompletableFuture<Results> send() {
+        return null;
+    }
+
+    static <T, U> Request<T, U> newBrokenRequest(Throwable exc) {
+        final MessageBuilder message = new MessageBuilder();
+
+        var hook = new RequestHook() {
+            @Override
+            public RemotePromise<AnyPointer.Reader> send() {
+                return new RemotePromise<>(CompletableFuture.failedFuture(exc), null);
+            }
+
+            @Override
+            public Object getBrand() {
+                return null;
+            }
+        };
+
+        var root = message.getRoot(AnyPointer.factory);
+        return new Request<T, U>(root, hook);
+    }
+}
+
diff --git a/runtime/src/main/java/org/capnproto/RequestHook.java b/runtime/src/main/java/org/capnproto/RequestHook.java
new file mode 100644
index 0000000..290aece
--- /dev/null
+++ b/runtime/src/main/java/org/capnproto/RequestHook.java
@@ -0,0 +1,6 @@
+package org.capnproto;
+
+interface RequestHook {
+    RemotePromise<AnyPointer.Reader> send();
+    Object getBrand();
+}
diff --git a/runtime/src/main/java/org/capnproto/Response.java b/runtime/src/main/java/org/capnproto/Response.java
new file mode 100644
index 0000000..8c188da
--- /dev/null
+++ b/runtime/src/main/java/org/capnproto/Response.java
@@ -0,0 +1,16 @@
+package org.capnproto;
+
+class Response {
+
+    final ResponseHook hook;
+    final AnyPointer.Reader results;
+
+    public Response(AnyPointer.Reader reader, ResponseHook hook) {
+        this.hook = hook;
+        this.results = reader;
+    }
+
+    public final <T> T getAs(FromPointerReader<T> factory) {
+        return this.results.getAs(factory);
+    }
+}
\ No newline at end of file
diff --git a/runtime/src/main/java/org/capnproto/ResponseHook.java b/runtime/src/main/java/org/capnproto/ResponseHook.java
new file mode 100644
index 0000000..7111d11
--- /dev/null
+++ b/runtime/src/main/java/org/capnproto/ResponseHook.java
@@ -0,0 +1,4 @@
+package org.capnproto;
+
+interface ResponseHook {
+}