docs/roadmap.md

@@ -113,7 +113,7 @@
 - [x] создание, чтение, подтверждение и отмена через Operator API;
 - [ ] выполнение, retry, verification и rollback в полной state machine;
 - [x] обязательные idempotency key, audit reason и job TTL;
-- [ ] Agent job channel только для собственного `node_id`;
+- [x] атомарный Agent job channel только для собственного `node_id`;
 - [x] начальные строгие JSON schemas v1 для `preflight` и `system.base-install`;
 - [ ] versioned JSON schemas для остальных action type;
 - [ ] restricted root helper через Unix socket;

src/ServerMonitorManager.Control/Program.cs

@@ -377,6 +377,20 @@ agents.MapPost("/heartbeat", async (
         });
     }
 });
+agents.MapGet("/provisioning/jobs/next", async (
+    HttpContext context,
+    ControlStore controlStore,
+    CancellationToken cancellationToken) =>
+{
+    var nodeId = context.User.FindFirstValue(ClaimTypes.NameIdentifier);
+    if (string.IsNullOrWhiteSpace(nodeId) || !NodeIdValidator.IsValid(nodeId))
+    {
+        return Results.Forbid();
+    }
+
+    var job = await controlStore.ClaimNextProvisioningJobAsync(nodeId, cancellationToken);
+    return job is null ? Results.NoContent() : Results.Ok(job);
+});
 
 var control = app.MapGroup("/api/v1/control").RequireAuthorization("Operator");
 control.MapGet("/agents", async (ControlStore controlStore, CancellationToken cancellationToken) =>

src/ServerMonitorManager.Control/ProvisioningStore.cs

@@ -96,6 +96,56 @@ public sealed partial class ControlStore
         return await reader.ReadAsync(cancellationToken) ? ReadProvisioningJob(reader) : null;
     }
 
+    public async Task<ProvisioningJob?> ClaimNextProvisioningJobAsync(
+        string nodeId,
+        CancellationToken cancellationToken = default)
+    {
+        await using var connection = await OpenAsync(cancellationToken);
+        await using var transaction = (SqliteTransaction)await connection.BeginTransactionAsync(cancellationToken);
+        var now = DateTimeOffset.UtcNow;
+        var command = connection.CreateCommand();
+        command.Transaction = transaction;
+        command.CommandText = """
+            UPDATE provisioning_jobs SET
+                state = $preflight,
+                updated_at = $now,
+                version = version + 1
+            WHERE id = (
+                SELECT id FROM provisioning_jobs
+                WHERE node_id = $node
+                  AND state = $queued
+                  AND expires_at > $now
+                ORDER BY created_at, id
+                LIMIT 1)
+              AND state = $queued
+            RETURNING *;
+            """;
+        command.Parameters.AddWithValue("$node", nodeId);
+        command.Parameters.AddWithValue("$queued", ProvisioningJobStates.Queued);
+        command.Parameters.AddWithValue("$preflight", ProvisioningJobStates.Preflight);
+        command.Parameters.AddWithValue("$now", now.ToString("O"));
+        ProvisioningJob? job;
+        await using (var reader = await command.ExecuteReaderAsync(cancellationToken))
+        {
+            job = await reader.ReadAsync(cancellationToken) ? ReadProvisioningJob(reader) : null;
+        }
+        if (job is null)
+        {
+            await transaction.CommitAsync(cancellationToken);
+            return null;
+        }
+
+        await WriteProvisioningEventAsync(
+            connection, transaction, job.Id, "job.claimed", job.State,
+            "Provisioning job claimed by its assigned Node.", now, cancellationToken);
+        await WriteAuditAsync(
+            connection, transaction, nodeId, "provisioning.job.claimed", job.Id,
+            JsonSerializer.Serialize(new { job.NodeId, job.ActionType, job.SchemaVersion }),
+            cancellationToken);
+        await transaction.CommitAsync(cancellationToken);
+        return job;
+    }
+
     public Task<ProvisioningJob?> ConfirmProvisioningJobAsync(
         string id,
         ProvisioningJobCommandRequest request,
@@ -148,7 +198,9 @@ public sealed partial class ControlStore
         }
         var allowed = requiredState is not null
             ? current.State == requiredState
-            : current.State is ProvisioningJobStates.Queued or ProvisioningJobStates.AwaitingConfirmation;
+            : current.State is ProvisioningJobStates.Queued
+                or ProvisioningJobStates.Preflight
+                or ProvisioningJobStates.AwaitingConfirmation;
         if (!allowed || current.ExpiresAt <= DateTimeOffset.UtcNow)
         {
             throw new ProvisioningTransitionException(current.State, targetState);

src/ServerMonitorManager.Core/Contracts.cs

@@ -176,6 +176,7 @@ public sealed record ProvisioningJob(
 public static class ProvisioningJobStates
 {
     public const string Queued = "Queued";
+    public const string Preflight = "Preflight";
     public const string AwaitingConfirmation = "AwaitingConfirmation";
     public const string Cancelled = "Cancelled";
 }

tests/ServerMonitorManager.Control.Tests/ControlApiTests.cs

@@ -118,6 +118,50 @@ public sealed class ControlApiTests : IAsyncDisposable
             $"/api/v1/control/provisioning/jobs/{job.Id}", cancellationToken)).StatusCode);
     }
 
+    [Fact]
+    public async Task AgentReceivesOnlyItsOwnProvisioningJob()
+    {
+        var nodeId = $"node-{Guid.NewGuid():N}"[..13];
+        var store = _factory.Services.GetRequiredService<ServerMonitorManager.Control.ControlStore>();
+        var cancellationToken = TestContext.Current.CancellationToken;
+        var token = await store.CreateEnrollmentTokenAsync(nodeId, TimeSpan.FromMinutes(10), cancellationToken);
+        await store.EnrollAsync(
+            new ServerMonitorManager.Core.EnrollmentRequest(
+                nodeId, token, "csr", Guid.NewGuid().ToString()),
+            () => new ServerMonitorManager.Control.IssuedCertificate(
+                "certificate", "ca", Guid.NewGuid().ToString("N"), DateTimeOffset.UtcNow.AddDays(1)),
+            cancellationToken);
+        using var parameters = System.Text.Json.JsonDocument.Parse("{}");
+        var created = await store.CreateProvisioningJobAsync(
+            nodeId,
+            new ServerMonitorManager.Core.ProvisioningJobCreateRequest(
+                "preflight", 1, parameters.RootElement.Clone(), 60,
+                "API Agent isolation test", Guid.NewGuid().ToString()),
+            "windows-pc",
+            cancellationToken);
+
+        using var other = _factory.CreateClient();
+        other.DefaultRequestHeaders.Add("X-Test-Identity", "other-node");
+        other.DefaultRequestHeaders.Add("X-Test-Role", "Agent");
+        Assert.Equal(HttpStatusCode.NoContent, (await other.GetAsync(
+            "/api/v1/agents/provisioning/jobs/next", cancellationToken)).StatusCode);
+
+        using var assigned = _factory.CreateClient();
+        assigned.DefaultRequestHeaders.Add("X-Test-Identity", nodeId);
+        assigned.DefaultRequestHeaders.Add("X-Test-Role", "Agent");
+        var response = await assigned.GetAsync(
+            "/api/v1/agents/provisioning/jobs/next", cancellationToken);
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+        var claimed = await response.Content.ReadFromJsonAsync<ServerMonitorManager.Core.ProvisioningJob>(
+            cancellationToken);
+        Assert.NotNull(claimed);
+        Assert.Equal(created.Id, claimed.Id);
+        Assert.Equal(nodeId, claimed.NodeId);
+        Assert.Equal(ServerMonitorManager.Core.ProvisioningJobStates.Preflight, claimed.State);
+        Assert.Equal(HttpStatusCode.NoContent, (await assigned.GetAsync(
+            "/api/v1/agents/provisioning/jobs/next", cancellationToken)).StatusCode);
+    }
+
     public async ValueTask DisposeAsync() => await _factory.DisposeAsync();
 
     private sealed class ControlApiFactory : WebApplicationFactory<controlapp::Program>

tests/ServerMonitorManager.Control.Tests/ControlStoreTests.cs

@@ -83,6 +83,35 @@ public sealed class ControlStoreTests : IAsyncDisposable
         Assert.Equal(ProvisioningJobStates.AwaitingConfirmation, next.State);
     }
 
+    [Fact]
+    public async Task ProvisioningJobCanBeClaimedOnlyOnceByAssignedNode()
+    {
+        var cancellationToken = TestContext.Current.CancellationToken;
+        var store = CreateStore();
+        await store.InitializeAsync(cancellationToken);
+        await EnrollAgentAsync(store, "home", "C3D4", cancellationToken);
+        await EnrollAgentAsync(store, "other", "E5F6", cancellationToken);
+        using var parameters = JsonDocument.Parse("{}");
+        var created = await store.CreateProvisioningJobAsync(
+            "home",
+            new ProvisioningJobCreateRequest(
+                "preflight", 1, parameters.RootElement.Clone(), 60,
+                "Inspect server", Guid.NewGuid().ToString()),
+            "operator",
+            cancellationToken);
+
+        Assert.Null(await store.ClaimNextProvisioningJobAsync("other", cancellationToken));
+        var claims = await Task.WhenAll(
+            store.ClaimNextProvisioningJobAsync("home", cancellationToken),
+            store.ClaimNextProvisioningJobAsync("home", cancellationToken));
+
+        var claimed = Assert.Single(claims, job => job is not null)!;
+        Assert.Equal(created.Id, claimed.Id);
+        Assert.Equal("home", claimed.NodeId);
+        Assert.Equal(ProvisioningJobStates.Preflight, claimed.State);
+        Assert.Null(Assert.Single(claims, job => job is null));
+    }
+
     [Fact]
     public void DiagnosticsExportOmitsRawIdentitiesAndNormalizesStates()
     {