diff --git a/Assets/Scripts/MovementComponent.cs b/Assets/Scripts/MovementComponent.cs
index 7bcdcfe..db4a661 100644
--- a/Assets/Scripts/MovementComponent.cs
+++ b/Assets/Scripts/MovementComponent.cs
@@ -4,6 +4,54 @@ using Network.NetworkApplication;
 using UnityEngine;
 using Vector3 = UnityEngine.Vector3;
 
+public static class ClientGameplayInputFlow
+{
+    public static bool HasPlanarInput(Vector3 input)
+    {
+        return new Vector2(input.x, input.z).sqrMagnitude > 0f;
+    }
+
+    public static bool TryCreateMoveInput(string playerId, long tick, Vector3 input, bool stopMessagePending, out MoveInput message)
+    {
+        if (!HasPlanarInput(input) && !stopMessagePending)
+        {
+            message = null;
+            return false;
+        }
+
+        message = new MoveInput
+        {
+            PlayerId = playerId,
+            Tick = tick,
+            MoveX = input.x,
+            MoveY = input.z
+        };
+        return true;
+    }
+
+    public static ShootInput CreateShootInput(string playerId, long tick, Vector3 aimDirection, string targetId = "")
+    {
+        var planarDirection = new Vector3(aimDirection.x, 0f, aimDirection.z);
+        if (planarDirection.sqrMagnitude <= 0f)
+        {
+            planarDirection = Vector3.forward;
+        }
+        else
+        {
+            planarDirection.Normalize();
+        }
+
+        return new ShootInput
+        {
+            PlayerId = playerId,
+            Tick = tick,
+            DirX = planarDirection.x,
+            DirY = planarDirection.z,
+            TargetId = targetId ?? string.Empty
+        };
+    }
+}
+
 public class MovementComponent : MonoBehaviour
 {
     [SerializeField] private float _sendInterval = 0.05f;
@@ -26,7 +74,10 @@ public class MovementComponent : MonoBehaviour
     private Vector3 _currentPos;
     private float _lerpTime;
     [SerializeField] private float _lerpRate = 0.1f;
-    private MoveInput _cachedInput;
+    private Vector3 _cachedMoveInput;
+    private Vector3 _lastAimDirection = Vector3.forward;
+    private bool _wasMovingLastFrame;
+    private bool _stopMessagePending;
 
     public void Init(bool isControlled, Player master, int speed = 0, long serverTick = 0)
     {
@@ -44,13 +95,33 @@ public class MovementComponent : MonoBehaviour
     {
         if (_isControlled)
         {
-            _cachedInput = CaptureInput();
+            _cachedMoveInput = CaptureMovement();
+            var hasMovement = ClientGameplayInputFlow.HasPlanarInput(_cachedMoveInput);
+            if (hasMovement)
+            {
+                _lastAimDirection = _cachedMoveInput;
+                _stopMessagePending = false;
+            }
+            else if (_wasMovingLastFrame)
+            {
+                _stopMessagePending = true;
+            }
+
+            _wasMovingLastFrame = hasMovement;
+
+            var shootInput = CaptureShootInput();
+            if (shootInput != null)
+            {
+                NetworkManager.Instance.SendShootInput(shootInput);
+            }
 
             if (Time.time - _lastSendTime > _sendInterval)
             {
-                if (_cachedInput != null)
+                if (ClientGameplayInputFlow.TryCreateMoveInput(_master.PlayerId, Tick, _cachedMoveInput, _stopMessagePending, out var moveInput))
                 {
-                    NetworkManager.Instance.SendMoveInput(_cachedInput);
+                    NetworkManager.Instance.SendMoveInput(moveInput);
+                    _predictionBuffer.Record(moveInput);
+                    _stopMessagePending = false;
                 }
 
                 _lastSendTime = Time.time;
@@ -72,11 +143,7 @@ public class MovementComponent : MonoBehaviour
                 _hasServerState = false;
             }
 
-            Simulate(_cachedInput);
-            if (_cachedInput != null)
-            {
-                _predictionBuffer.Record(_cachedInput);
-            }
+            Simulate(_cachedMoveInput);
         }
         else
         {
@@ -98,27 +165,36 @@ public class MovementComponent : MonoBehaviour
         ReplayPendingInputs(replayInputs);
     }
 
-    private MoveInput CaptureInput()
+    private Vector3 CaptureMovement()
     {
-        var input = new Vector3(Input.GetAxisRaw("Horizontal"), 0, Input.GetAxisRaw("Vertical"));
-        if (input == Vector3.zero)
+        return new Vector3(Input.GetAxisRaw("Horizontal"), 0f, Input.GetAxisRaw("Vertical"));
+    }
+
+    private ShootInput CaptureShootInput()
+    {
+        if (!Input.GetMouseButtonDown(0))
         {
             return null;
         }
 
-        return new MoveInput
-        {
-            PlayerId = _master.PlayerId,
-            Tick = Tick,
-            MoveX = input.x,
-            MoveY = input.z
-        };
+        return ClientGameplayInputFlow.CreateShootInput(_master.PlayerId, Tick, ResolveAimDirection());
     }
 
-    private void Simulate(MoveInput input)
+    private Vector3 ResolveAimDirection()
     {
-        var dir = input == null ? Vector3.zero : new Vector3(input.MoveX, 0f, input.MoveY);
-        _rigid.velocity = _speed * dir;
+        if (ClientGameplayInputFlow.HasPlanarInput(_lastAimDirection))
+        {
+            return _lastAimDirection;
+        }
+
+        var forward = _master != null ? _master.transform.forward : transform.forward;
+        var planarForward = new Vector3(forward.x, 0f, forward.z);
+        return ClientGameplayInputFlow.HasPlanarInput(planarForward) ? planarForward : Vector3.forward;
+    }
+
+    private void Simulate(Vector3 input)
+    {
+        _rigid.velocity = _speed * input;
         if (_isControlled)
         {
             MainUI.Instance.OnClientPosChanged(_rigid.position);
@@ -182,4 +258,4 @@ public class MovementComponent : MonoBehaviour
             MainUI.Instance.OnClientPosChanged(_rigid.position);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Assets/Scripts/NetworkFramework.asmdef b/Assets/Scripts/NetworkFramework.asmdef
new file mode 100644
index 0000000..3ee1fa9
--- /dev/null
+++ b/Assets/Scripts/NetworkFramework.asmdef
@@ -0,0 +1,16 @@
+{
+    "name": "NetworkFramework",
+    "rootNamespace": "",
+    "references": [
+        "GUID:d972d56d6b084684b5b0666f4856da75"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}
\ No newline at end of file
diff --git a/Assets/Scripts/NetworkFramework.asmdef.meta b/Assets/Scripts/NetworkFramework.asmdef.meta
new file mode 100644
index 0000000..79c6562
--- /dev/null
+++ b/Assets/Scripts/NetworkFramework.asmdef.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 25ab7ef51eeef1e4ea6e24413cbabdff
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/NetworkManager.cs b/Assets/Scripts/NetworkManager.cs
index 3e6eddc..dd17f3f 100644
--- a/Assets/Scripts/NetworkManager.cs
+++ b/Assets/Scripts/NetworkManager.cs
@@ -13,16 +13,17 @@ public class NetworkManager : MonoBehaviour
     private const int DefaultReliablePort = 8080;
     private const int DefaultSyncPort = 8081;
 
-    public static NetworkManager Instance;
-    private SharedNetworkRuntime _networkRuntime;
-    private IPEndPoint _serverPoint;
-    private uint _sequence = 0;
-    private Task _networkDrainTask = Task.CompletedTask;
     [SerializeField] private GameObject _wrongWindow;
     [SerializeField] private bool _enableNetworkDiagnosticsOverlay = true;
     [SerializeField] private string _serverIp = DefaultServerIp;
     [SerializeField] private int _reliablePort = DefaultReliablePort;
     [SerializeField] private int _syncPort = DefaultSyncPort;
+    
+    public static NetworkManager Instance;
+    private SharedNetworkRuntime _networkRuntime;
+    private IPEndPoint _serverPoint;
+    private uint _sequence = 0;
+    private Task _networkDrainTask = Task.CompletedTask;
 
     private void Awake()
     {
@@ -197,24 +198,23 @@ public class NetworkManager : MonoBehaviour
         Debug.Log($"[NetworkManager] Session {lifecycleEvent.PreviousState} -> {lifecycleEvent.CurrentState} ({lifecycleEvent.Kind}) {lifecycleEvent.Reason}");
     }
 
-    public void SendMoveInput(string playerId, Vector3 input)
-    {
-        var message = new MoveInput
-        {
-            PlayerId = playerId,
-            MoveX = input.x,
-            MoveY = input.z
-        };
-        _networkRuntime.MessageManager.SendMessage(message, MessageType.MoveInput);
-        Debug.Log($"PlayerMoveSeq: {_sequence++}");
-    }
-
     public void SendMoveInput(MoveInput message)
     {
         _networkRuntime.MessageManager.SendMessage(message, MessageType.MoveInput);
         Debug.Log($"PlayerMoveSeq: {_sequence++}");
     }
 
+    public void SendShootInput(string playerId, Vector3 direction, long tick = 0, string targetId = "")
+    {
+        SendShootInput(ClientGameplayInputFlow.CreateShootInput(playerId, tick, direction, targetId));
+    }
+
+    public void SendShootInput(ShootInput message)
+    {
+        _networkRuntime.MessageManager.SendMessage(message, MessageType.ShootInput);
+        Debug.Log($"PlayerShootSeq: {_sequence++}");
+    }
+
     public void SendLoginRequest(string playerId, int speed)
     {
         var request = new LoginRequest()
diff --git a/Assets/Tests/EditMode/Network/MessageManagerTests.cs b/Assets/Tests/EditMode/Network/MessageManagerTests.cs
index c53e011..b273025 100644
--- a/Assets/Tests/EditMode/Network/MessageManagerTests.cs
+++ b/Assets/Tests/EditMode/Network/MessageManagerTests.cs
@@ -86,6 +86,38 @@ namespace Tests.EditMode.Network
             Assert.That(parsed.MoveY, Is.EqualTo(-1));
         }
 
+        [Test]
+        public void SendMessage_ZeroVectorMoveInput_UsesSyncLanePolicy()
+        {
+            var reliableTransport = new FakeTransport();
+            var syncTransport = new FakeTransport();
+            var manager = new MessageManager(
+                reliableTransport,
+                new MainThreadNetworkDispatcher(),
+                new DefaultMessageDeliveryPolicyResolver(),
+                syncTransport);
+            var message = new MoveInput
+            {
+                PlayerId = "player-1",
+                Tick = 13,
+                MoveX = 0f,
+                MoveY = 0f
+            };
+
+            manager.SendMessage(message, MessageType.MoveInput);
+
+            Assert.That(reliableTransport.SendCallCount, Is.EqualTo(0));
+            Assert.That(syncTransport.SendCallCount, Is.EqualTo(1));
+
+            var envelope = Envelope.Parser.ParseFrom(syncTransport.LastSentData);
+            var parsed = MoveInput.Parser.ParseFrom(envelope.Payload);
+            Assert.That(envelope.Type, Is.EqualTo((int)MessageType.MoveInput));
+            Assert.That(parsed.PlayerId, Is.EqualTo("player-1"));
+            Assert.That(parsed.Tick, Is.EqualTo(13));
+            Assert.That(parsed.MoveX, Is.EqualTo(0f));
+            Assert.That(parsed.MoveY, Is.EqualTo(0f));
+        }
+
         [Test]
         public void SendMessage_ShootInput_UsesReliableLanePolicy()
         {
diff --git a/Assets/Tests/EditMode/Network/Network.EditMode.Tests.asmdef b/Assets/Tests/EditMode/Network/Network.EditMode.Tests.asmdef
index 9e24742..a50e3c6 100644
--- a/Assets/Tests/EditMode/Network/Network.EditMode.Tests.asmdef
+++ b/Assets/Tests/EditMode/Network/Network.EditMode.Tests.asmdef
@@ -4,7 +4,8 @@
     "references": [
         "Network.Runtime",
         "UnityEngine.TestRunner",
-        "UnityEditor.TestRunner"
+        "UnityEditor.TestRunner",
+        "NetworkFramework"
     ],
     "includePlatforms": [
         "Editor"
diff --git a/Assets/Tests/EditMode/Network/SyncStrategyTests.cs b/Assets/Tests/EditMode/Network/SyncStrategyTests.cs
index f307676..b55029e 100644
--- a/Assets/Tests/EditMode/Network/SyncStrategyTests.cs
+++ b/Assets/Tests/EditMode/Network/SyncStrategyTests.cs
@@ -6,11 +6,54 @@ using Network.NetworkApplication;
 using Network.NetworkHost;
 using Network.NetworkTransport;
 using NUnit.Framework;
+using UnityEngine;
+using Vector3 = UnityEngine.Vector3;
 
 namespace Tests.EditMode.Network
 {
     public class SyncStrategyTests
     {
+        [Test]
+        public void ClientGameplayInputFlow_StopTransition_EmitsSingleZeroVectorMoveInput()
+        {
+            var released = ClientGameplayInputFlow.TryCreateMoveInput(
+                "player-1",
+                8,
+                Vector3.zero,
+                true,
+                out var stopInput);
+            var continuedIdle = ClientGameplayInputFlow.TryCreateMoveInput(
+                "player-1",
+                9,
+                Vector3.zero,
+                false,
+                out var idleInput);
+
+            Assert.That(released, Is.True);
+            Assert.That(stopInput, Is.Not.Null);
+            Assert.That(stopInput.PlayerId, Is.EqualTo("player-1"));
+            Assert.That(stopInput.Tick, Is.EqualTo(8));
+            Assert.That(stopInput.MoveX, Is.EqualTo(0f));
+            Assert.That(stopInput.MoveY, Is.EqualTo(0f));
+            Assert.That(continuedIdle, Is.False);
+            Assert.That(idleInput, Is.Null);
+        }
+
+        [Test]
+        public void ClientGameplayInputFlow_CreateShootInput_UsesSplitShootMessageFields()
+        {
+            var shootInput = ClientGameplayInputFlow.CreateShootInput(
+                "player-1",
+                21,
+                new Vector3(2f, 0f, 0f));
+
+            Assert.That(shootInput.PlayerId, Is.EqualTo("player-1"));
+            Assert.That(shootInput.Tick, Is.EqualTo(21));
+            Assert.That(shootInput.DirX, Is.EqualTo(1f));
+            Assert.That(shootInput.DirY, Is.EqualTo(0f));
+            Assert.That(shootInput.TargetId, Is.EqualTo(string.Empty));
+        }
+
         [Test]
         public void ClientPredictionBuffer_AuthoritativeState_PrunesAcknowledgedMoveInputs()
         {
@@ -149,4 +192,4 @@ namespace Tests.EditMode.Network
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/.openspec.yaml b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/.openspec.yaml
new file mode 100644
index 0000000..65bf7c9
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/.openspec.yaml
@@ -0,0 +1,2 @@
+schema: spec-driven
+created: 2026-03-28
diff --git a/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/design.md b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/design.md
new file mode 100644
index 0000000..2f4c69f
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/design.md
@@ -0,0 +1,70 @@
+## Context
+
+The repository already has the shared MVP message split in place: `MoveInput` exists for high-frequency movement and `ShootInput` exists for reliable firing intent. The current Unity client path has only implemented part of that contract. `MovementComponent` captures movement every send interval, but it returns `null` for zero input, which means releasing input does not emit an authoritative stop update. The same component also drives immediate local prediction for the controlled player, while `NetworkManager` only exposes `SendMoveInput(...)` and has no shooting send path.
+
+This change is cross-cutting enough to justify a design document because it touches Unity input capture, local prediction timing, message selection, and delivery-lane expectations together. It also needs to preserve the shared/client boundary already established by the networking architecture: Unity input polling stays in Unity-side scripts, while the shared networking layer continues to own message transport policy.
+
+## Goals / Non-Goals
+
+**Goals:**
+- Define an MVP-safe client input flow that sends movement and shooting through `MoveInput` and `ShootInput` only.
+- Preserve immediate local movement prediction for the controlled player.
+- Ensure movement release emits one explicit zero-vector `MoveInput` so the server can stop authoritative motion.
+- Add a `NetworkManager.SendShootInput(...)` API that keeps shooting traffic on the reliable lane through existing delivery-policy resolution.
+- Keep local shooting feedback optional and cosmetic so authoritative combat remains server-driven.
+
+**Non-Goals:**
+- Redesign the shared transport, message envelope, or delivery-policy system.
+- Introduce `UnityEngine` dependencies into shared code under `Assets/Scripts/Network/`.
+- Define full authoritative combat-result handling or client-side rollback for rejected shots.
+- Rework remote-player interpolation or the later authoritative `PlayerState` application steps from the TODO.
+
+## Decisions
+
+### Decision: Keep gameplay input ownership in Unity-side controlled-player components
+Movement capture, release detection, and shooting input polling will stay in Unity-facing scripts such as `MovementComponent` or an adjacent controlled-player helper, with `NetworkManager` acting as the send boundary into shared networking code.
+
+This keeps Unity polling (`Input.*`) out of shared networking code and matches the current architecture, where `MovementComponent` already owns local prediction and `NetworkManager` already owns message submission.
+
+Alternative considered: move gameplay input orchestration into shared networking services. Rejected because shared code cannot depend on Unity input APIs and the TODO step only needs client-side MVP wiring, not a new host-agnostic input abstraction.
+
+### Decision: Represent input release as an edge-triggered zero-vector `MoveInput`
+The client will continue sampling movement every send interval, but it must distinguish between "still idle" and "just released input." On the transition from non-zero movement to idle, it will send one final `MoveInput` whose vector is zero. Continued idle frames will not keep spamming zero messages unless a later movement input starts and stops again.
+
+This satisfies the authoritative-stop acceptance criteria without bloating sync traffic or changing the meaning of `MoveInput`.
+
+Alternative considered: infer stop on the server from missing movement packets. Rejected because it couples stop timing to packet cadence and conflicts with the TODO requirement for an explicit stop message.
+
+### Decision: Keep local movement prediction immediate and independent from send-path branching
+The controlled player should continue applying local movement immediately from the latest captured input, including the zero-vector case on release, while the network send path decides whether that captured input should be transmitted this frame.
+
+This preserves current feel and keeps prediction behavior stable even as the send rules become more explicit.
+
+Alternative considered: simulate only after a message is queued for send. Rejected because it would delay local response and entangle presentation with networking cadence.
+
+### Decision: Add a narrow `SendShootInput(...)` API and leave shot presentation outside authoritative gameplay
+`NetworkManager` will gain a dedicated method for sending `ShootInput`, mirroring the current movement send API. The client capture path will construct `ShootInput` from local fire intent and rely on the existing delivery-policy resolver so the message remains on the reliable lane. Any local muzzle flash, animation, or other feedback remains optional and must not decide damage, hit confirmation, or death state.
+
+This keeps the MVP send surface explicit and ensures the client no longer needs legacy broad gameplay messages for firing.
+
+Alternative considered: reuse a generic "send gameplay action" entry point. Rejected because it weakens the split-message contract and leaves room for `PlayerAction`-style payloads to creep back into client code.
+
+## Risks / Trade-offs
+
+- [Risk] Edge-triggered stop detection can regress if input state tracking mixes "captured this frame" with "sent this frame." → Mitigation: define the release rule around the last non-zero captured movement state and cover it with regression tests.
+- [Risk] Shooting capture may depend on an existing Unity scene/input setup that is less formalized than movement. → Mitigation: keep the MVP contract narrow, allow optional cosmetic feedback, and leave targeting details minimal when no authoritative target is selected.
+- [Risk] Client scripts could accidentally reintroduce legacy gameplay messages while adding fire input. → Mitigation: codify the split-message-only rule in specs and tests around `NetworkManager` send APIs.
+- [Risk] Overloading `MovementComponent` with too many responsibilities could make later TODO steps harder to implement. → Mitigation: keep this step focused on input capture/send semantics and defer broader controller refactors unless implementation friction proves they are necessary.
+
+## Migration Plan
+
+1. Update the specs so the MVP client-input contract, message selection rules, and lane expectations are explicit.
+2. Implement Unity-side input changes for movement release detection, local prediction continuity, and shooting capture.
+3. Add `NetworkManager.SendShootInput(...)` and remove any remaining client gameplay dependence on legacy broad messages.
+4. Add regression coverage for stop-message emission, reliable shooting dispatch, and split-message-only gameplay sends.
+5. Roll back, if needed, by removing the shooting send entry point and returning to movement-only capture while preserving the existing shared message definitions.
+
+## Open Questions
+
+- Which existing Unity input source should drive the initial `ShootInput` direction in MVP: pointer-derived aim, avatar facing, or a simpler fixed forward fallback?
+- Should the first implementation keep shooting capture inside `MovementComponent`, or is a small adjacent controlled-player input script clearer once fire intent is added?
diff --git a/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/proposal.md b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/proposal.md
new file mode 100644
index 0000000..5aa8843
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/proposal.md
@@ -0,0 +1,26 @@
+## Why
+
+The MVP protocol has already been split into `MoveInput` and `ShootInput`, but the client input loop still only emits non-zero movement updates and has no shooting send path. Step 2 is needed now so the client actually drives gameplay through the split message contract before later authoritative state and combat-result work depends on it.
+
+## What Changes
+
+- Define the MVP client gameplay-input flow for movement capture, stop signaling, local prediction, and shooting input capture.
+- Require the controlled player to send an explicit zero-vector `MoveInput` when local movement input is released so authoritative movement can stop cleanly.
+- Add a `NetworkManager.SendShootInput(...)` path and require client gameplay actions to be sent only as `MoveInput` or `ShootInput`.
+- Preserve immediate local movement prediction for the controlled player while keeping local shooting presentation optional and purely cosmetic.
+- Add regression coverage for the client-side input flow and the delivery-lane expectations it depends on.
+
+## Capabilities
+
+### New Capabilities
+- `client-gameplay-input`: Defines how the MVP client captures movement and shooting intent, predicts local movement, and sends gameplay actions through split message types.
+
+### Modified Capabilities
+- `network-gameplay-message-types`: Tighten the gameplay message contract so client gameplay-action send paths use `MoveInput` and `ShootInput` directly instead of legacy broad messages such as `PlayerAction`.
+- `network-sync-strategy`: Clarify that explicit zero-vector `MoveInput` updates remain valid sync-lane traffic while `ShootInput` continues to use the reliable lane from the client send path.
+
+## Impact
+
+- Affected Unity-side client code in `Assets/Scripts/MovementComponent.cs`, `Assets/Scripts/NetworkManager.cs`, and related local input/presentation scripts.
+- Affected shared or integration expectations for gameplay message selection and delivery-lane behavior.
+- Edit-mode regression tests under `Assets/Tests/EditMode/Network/`, plus any focused client-side tests needed for input-flow coverage.
diff --git a/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/specs/client-gameplay-input/spec.md b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/specs/client-gameplay-input/spec.md
new file mode 100644
index 0000000..62de543
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/specs/client-gameplay-input/spec.md
@@ -0,0 +1,30 @@
+## ADDED Requirements
+
+### Requirement: Controlled client movement input preserves immediate prediction and explicit stop signaling
+The MVP client SHALL capture movement intent for the controlled player in Unity-side input code, apply local movement prediction immediately, and send `MoveInput` updates through the networking boundary. When movement input transitions from non-zero to idle, the client MUST send one final zero-vector `MoveInput` so authoritative movement can stop cleanly.
+
+#### Scenario: Controlled player moves locally without waiting for the network
+- **WHEN** the controlled player provides non-zero movement input
+- **THEN** the client applies local movement prediction immediately for presentation
+- **THEN** the client submits a `MoveInput` carrying the current player id, tick, and planar movement vector through the networking send path
+
+#### Scenario: Releasing movement emits an explicit stop update
+- **WHEN** the controlled player releases movement input after previously providing non-zero movement
+- **THEN** the client sends exactly one final `MoveInput` whose movement vector is zero
+- **THEN** local predicted movement also stops immediately without waiting for authoritative correction
+
+### Requirement: Controlled client captures shooting intent as a dedicated gameplay input
+The MVP client SHALL capture local fire intent separately from movement and translate that intent into `ShootInput` messages rather than overloading movement or generic gameplay-action payloads.
+
+#### Scenario: Firing produces a shoot input message
+- **WHEN** the controlled player triggers a fire action
+- **THEN** the client constructs a `ShootInput` containing the current player id, tick, and aim direction used by the MVP client flow
+- **THEN** the message is sent through a dedicated shooting send path instead of a legacy generic gameplay-action message
+
+### Requirement: Local shooting presentation remains cosmetic
+The MVP client SHALL treat any immediate local shooting feedback as optional cosmetic presentation and MUST NOT use it to finalize authoritative combat outcomes.
+
+#### Scenario: Cosmetic firing feedback does not decide gameplay truth
+- **WHEN** the client plays local muzzle flash, animation, or similar fire feedback before server confirmation
+- **THEN** that feedback does not apply authoritative damage, hit confirmation, or death resolution locally
+- **THEN** gameplay truth remains dependent on authoritative server messages
diff --git a/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/specs/network-gameplay-message-types/spec.md b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/specs/network-gameplay-message-types/spec.md
new file mode 100644
index 0000000..c71ec46
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/specs/network-gameplay-message-types/spec.md
@@ -0,0 +1,14 @@
+## ADDED Requirements
+
+### Requirement: Client gameplay actions use split gameplay messages directly
+The client-facing gameplay send path SHALL express MVP gameplay actions directly as `MoveInput` and `ShootInput`. Controlled-player movement and firing MUST NOT depend on legacy broad gameplay messages such as `PlayerAction`.
+
+#### Scenario: Client movement uses MoveInput directly
+- **WHEN** the controlled client sends gameplay movement intent
+- **THEN** the send path uses `MoveInput`
+- **THEN** the client does not wrap that movement intent in `PlayerAction` or another broad gameplay payload
+
+#### Scenario: Client firing uses ShootInput directly
+- **WHEN** the controlled client sends gameplay firing intent
+- **THEN** the send path uses `ShootInput`
+- **THEN** the client does not wrap that firing intent in `PlayerAction` or another broad gameplay payload
diff --git a/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/specs/network-sync-strategy/spec.md b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/specs/network-sync-strategy/spec.md
new file mode 100644
index 0000000..ad9cd6f
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/specs/network-sync-strategy/spec.md
@@ -0,0 +1,14 @@
+## ADDED Requirements
+
+### Requirement: Client gameplay input preserves movement and shooting lane semantics
+The client gameplay-input flow SHALL preserve the MVP delivery-lane contract when sending gameplay actions. Explicit zero-vector `MoveInput` updates generated on input release MUST remain valid high-frequency sync traffic, and `ShootInput` generated from local fire intent MUST use the reliable ordered lane.
+
+#### Scenario: Stop movement update remains sync traffic
+- **WHEN** the controlled client sends a zero-vector `MoveInput` after releasing movement input
+- **THEN** the message is still treated as `MoveInput` for delivery-policy resolution
+- **THEN** the networking stack routes it through the high-frequency sync lane when one is configured
+
+#### Scenario: Shoot input remains reliable traffic
+- **WHEN** the controlled client sends `ShootInput` from the MVP fire-input path
+- **THEN** the networking stack resolves that message to the reliable ordered lane
+- **THEN** firing intent does not share the latest-wins sync delivery behavior used for movement updates
diff --git a/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/tasks.md b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/tasks.md
new file mode 100644
index 0000000..5800866
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-align-client-input-flow-with-mvp/tasks.md
@@ -0,0 +1,17 @@
+## 1. Update Controlled-Player Input Capture
+
+- [x] 1.1 Refine the controlled-player movement input flow so releasing input emits one zero-vector `MoveInput` while continued idle frames do not spam duplicate stop packets.
+- [x] 1.2 Preserve immediate local movement prediction for the controlled player across both non-zero movement and release-to-stop transitions.
+- [x] 1.3 Add an MVP shooting input capture path in the Unity-side controlled-player flow, including direction/target defaults that fit the current scene setup.
+
+## 2. Align Network Send Boundaries With Split Gameplay Messages
+
+- [x] 2.1 Add `NetworkManager.SendShootInput(...)` and route the new client fire path through `ShootInput`.
+- [x] 2.2 Ensure client gameplay actions are sent only as `MoveInput` and `ShootInput`, with no remaining controlled-player dependence on legacy broad gameplay messages such as `PlayerAction`.
+- [x] 2.3 Keep any local shooting feedback optional and cosmetic so authoritative combat still depends on server-driven messages.
+
+## 3. Verify MVP Input-Flow Regressions
+
+- [x] 3.1 Add or update tests covering explicit stop-message emission and the split-message-only gameplay send path.
+- [x] 3.2 Add or update tests covering that `ShootInput` from the client path resolves to the reliable lane while `MoveInput` stop updates remain sync-lane traffic.
+- [x] 3.3 Run `dotnet build Network.EditMode.Tests.csproj -v minimal` and `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal` after implementation.
diff --git a/openspec/specs/client-gameplay-input/spec.md b/openspec/specs/client-gameplay-input/spec.md
new file mode 100644
index 0000000..0bf51df
--- /dev/null
+++ b/openspec/specs/client-gameplay-input/spec.md
@@ -0,0 +1,34 @@
+# client-gameplay-input Specification
+
+## Purpose
+Define how the controlled Unity client captures MVP gameplay intent, preserves immediate local prediction, and sends movement and shooting through split gameplay messages.
+
+## Requirements
+### Requirement: Controlled client movement input preserves immediate prediction and explicit stop signaling
+The MVP client SHALL capture movement intent for the controlled player in Unity-side input code, apply local movement prediction immediately, and send `MoveInput` updates through the networking boundary. When movement input transitions from non-zero to idle, the client MUST send one final zero-vector `MoveInput` so authoritative movement can stop cleanly.
+
+#### Scenario: Controlled player moves locally without waiting for the network
+- **WHEN** the controlled player provides non-zero movement input
+- **THEN** the client applies local movement prediction immediately for presentation
+- **THEN** the client submits a `MoveInput` carrying the current player id, tick, and planar movement vector through the networking send path
+
+#### Scenario: Releasing movement emits an explicit stop update
+- **WHEN** the controlled player releases movement input after previously providing non-zero movement
+- **THEN** the client sends exactly one final `MoveInput` whose movement vector is zero
+- **THEN** local predicted movement also stops immediately without waiting for authoritative correction
+
+### Requirement: Controlled client captures shooting intent as a dedicated gameplay input
+The MVP client SHALL capture local fire intent separately from movement and translate that intent into `ShootInput` messages rather than overloading movement or generic gameplay-action payloads.
+
+#### Scenario: Firing produces a shoot input message
+- **WHEN** the controlled player triggers a fire action
+- **THEN** the client constructs a `ShootInput` containing the current player id, tick, and aim direction used by the MVP client flow
+- **THEN** the message is sent through a dedicated shooting send path instead of a legacy generic gameplay-action message
+
+### Requirement: Local shooting presentation remains cosmetic
+The MVP client SHALL treat any immediate local shooting feedback as optional cosmetic presentation and MUST NOT use it to finalize authoritative combat outcomes.
+
+#### Scenario: Cosmetic firing feedback does not decide gameplay truth
+- **WHEN** the client plays local muzzle flash, animation, or similar fire feedback before server confirmation
+- **THEN** that feedback does not apply authoritative damage, hit confirmation, or death resolution locally
+- **THEN** gameplay truth remains dependent on authoritative server messages
diff --git a/openspec/specs/network-gameplay-message-types/spec.md b/openspec/specs/network-gameplay-message-types/spec.md
index 56d3894..7e3f207 100644
--- a/openspec/specs/network-gameplay-message-types/spec.md
+++ b/openspec/specs/network-gameplay-message-types/spec.md
@@ -38,3 +38,16 @@ The shared networking contract SHALL define the MVP payload fields for gameplay
 - **WHEN** client or server code constructs or parses `CombatEvent`
 - **THEN** the message exposes `tick`, `eventType`, `attackerId`, `targetId`, `damage`, and `hitPosition`
 - **THEN** `CombatEventType` provides explicit combat-result categories for interpreting that event payload
+
+### Requirement: Client gameplay actions use split gameplay messages directly
+The client-facing gameplay send path SHALL express MVP gameplay actions directly as `MoveInput` and `ShootInput`. Controlled-player movement and firing MUST NOT depend on legacy broad gameplay messages such as `PlayerAction`.
+
+#### Scenario: Client movement uses MoveInput directly
+- **WHEN** the controlled client sends gameplay movement intent
+- **THEN** the send path uses `MoveInput`
+- **THEN** the client does not wrap that movement intent in `PlayerAction` or another broad gameplay payload
+
+#### Scenario: Client firing uses ShootInput directly
+- **WHEN** the controlled client sends gameplay firing intent
+- **THEN** the send path uses `ShootInput`
+- **THEN** the client does not wrap that firing intent in `PlayerAction` or another broad gameplay payload
diff --git a/openspec/specs/network-sync-strategy/spec.md b/openspec/specs/network-sync-strategy/spec.md
index 17e32f6..bc0cbf8 100644
--- a/openspec/specs/network-sync-strategy/spec.md
+++ b/openspec/specs/network-sync-strategy/spec.md
@@ -71,3 +71,16 @@ The networking stack SHALL route sync-designated traffic through the sync transp
 #### Scenario: Dedicated sync transport unavailable
 - **WHEN** sync-designated traffic is sent from a session whose integration wiring does not include a sync transport
 - **THEN** the traffic SHALL be dispatched on the primary reliable transport without failing session operation
+
+### Requirement: Client gameplay input preserves movement and shooting lane semantics
+The client gameplay-input flow SHALL preserve the MVP delivery-lane contract when sending gameplay actions. Explicit zero-vector `MoveInput` updates generated on input release MUST remain valid high-frequency sync traffic, and `ShootInput` generated from local fire intent MUST use the reliable ordered lane.
+
+#### Scenario: Stop movement update remains sync traffic
+- **WHEN** the controlled client sends a zero-vector `MoveInput` after releasing movement input
+- **THEN** the message is still treated as `MoveInput` for delivery-policy resolution
+- **THEN** the networking stack routes it through the high-frequency sync lane when one is configured
+
+#### Scenario: Shoot input remains reliable traffic
+- **WHEN** the controlled client sends `ShootInput` from the MVP fire-input path
+- **THEN** the networking stack resolves that message to the reliable ordered lane
+- **THEN** firing intent does not share the latest-wins sync delivery behavior used for movement updates