diff --git a/server/NeonSprawl.Server.Tests/Game/Gathering/ResourceNodeDefinitionRegistryTests.cs b/server/NeonSprawl.Server.Tests/Game/Gathering/ResourceNodeDefinitionRegistryTests.cs
new file mode 100644
index 0000000..b334627
--- /dev/null
+++ b/server/NeonSprawl.Server.Tests/Game/Gathering/ResourceNodeDefinitionRegistryTests.cs
@@ -0,0 +1,315 @@
+using System.IO;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging.Abstractions;
+using NeonSprawl.Server.Game.Gathering;
+using NeonSprawl.Server.Tests;
+using Xunit;
+
+namespace NeonSprawl.Server.Tests.Game.Gathering;
+
+public class ResourceNodeDefinitionRegistryTests
+{
+    private static ResourceNodeDefinitionRegistry CreateRegistryFromRows(
+        IReadOnlyDictionary<string, ResourceNodeDefRow> nodesById,
+        IReadOnlyDictionary<string, ResourceYieldRow> yieldsByNodeDefId)
+    {
+        var catalog = new ResourceNodeCatalog(
+            "/tmp/resource-nodes",
+            nodesById,
+            yieldsByNodeDefId,
+            nodeCatalogJsonFileCount: 1,
+            yieldCatalogJsonFileCount: 1);
+        return new ResourceNodeDefinitionRegistry(catalog);
+    }
+
+    [Fact]
+    public void TryGetDefinition_ShouldReturnTrueAndExpectedMetadata_WhenNodeDefIdExists()
+    {
+        // Arrange
+        const string nodeDefId = "prototype_resource_node_alpha";
+        var nodes = new Dictionary<string, ResourceNodeDefRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceNodeDefRow(
+                nodeDefId,
+                "Prototype Salvage Heap",
+                "consumer_salvage",
+                MaxGathers: 10),
+        };
+        var yields = new Dictionary<string, ResourceYieldRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceYieldRow(nodeDefId, "scrap_metal_bulk", Quantity: 1),
+        };
+        var registry = CreateRegistryFromRows(nodes, yields);
+        // Act
+        var found = registry.TryGetDefinition(nodeDefId, out var def);
+        // Assert
+        Assert.True(found);
+        Assert.NotNull(def);
+        Assert.Equal("Prototype Salvage Heap", def.DisplayName);
+        Assert.Equal("consumer_salvage", def.GatherLens);
+        Assert.Equal(10, def.MaxGathers);
+    }
+
+    [Fact]
+    public void TryGetYield_ShouldReturnTrueAndExpectedMetadata_WhenNodeDefIdExists()
+    {
+        // Arrange
+        const string nodeDefId = "prototype_resource_node_alpha";
+        var nodes = new Dictionary<string, ResourceNodeDefRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceNodeDefRow(
+                nodeDefId,
+                "Prototype Salvage Heap",
+                "consumer_salvage",
+                MaxGathers: 10),
+        };
+        var yields = new Dictionary<string, ResourceYieldRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceYieldRow(nodeDefId, "scrap_metal_bulk", Quantity: 1),
+        };
+        var registry = CreateRegistryFromRows(nodes, yields);
+        // Act
+        var found = registry.TryGetYield(nodeDefId, out var yield);
+        // Assert
+        Assert.True(found);
+        Assert.NotNull(yield);
+        Assert.Equal("scrap_metal_bulk", yield.ItemId);
+        Assert.Equal(1, yield.Quantity);
+    }
+
+    [Fact]
+    public void TryGetDefinition_ShouldReturnFalse_WhenNodeDefIdIsNull()
+    {
+        // Arrange
+        const string nodeDefId = "prototype_resource_node_alpha";
+        var nodes = new Dictionary<string, ResourceNodeDefRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceNodeDefRow(
+                nodeDefId,
+                "Prototype Salvage Heap",
+                "consumer_salvage",
+                MaxGathers: 10),
+        };
+        var yields = new Dictionary<string, ResourceYieldRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceYieldRow(nodeDefId, "scrap_metal_bulk", Quantity: 1),
+        };
+        var registry = CreateRegistryFromRows(nodes, yields);
+        // Act
+        var found = registry.TryGetDefinition(null, out var def);
+        // Assert
+        Assert.False(found);
+        Assert.Null(def);
+    }
+
+    [Fact]
+    public void TryGetYield_ShouldReturnFalse_WhenNodeDefIdIsNull()
+    {
+        // Arrange
+        const string nodeDefId = "prototype_resource_node_alpha";
+        var nodes = new Dictionary<string, ResourceNodeDefRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceNodeDefRow(
+                nodeDefId,
+                "Prototype Salvage Heap",
+                "consumer_salvage",
+                MaxGathers: 10),
+        };
+        var yields = new Dictionary<string, ResourceYieldRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceYieldRow(nodeDefId, "scrap_metal_bulk", Quantity: 1),
+        };
+        var registry = CreateRegistryFromRows(nodes, yields);
+        // Act
+        var found = registry.TryGetYield(null, out var yield);
+        // Assert
+        Assert.False(found);
+        Assert.Null(yield);
+    }
+
+    [Fact]
+    public void TryGetDefinition_ShouldReturnFalse_WhenNodeDefIdUnknown()
+    {
+        // Arrange
+        const string nodeDefId = "prototype_resource_node_alpha";
+        var nodes = new Dictionary<string, ResourceNodeDefRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceNodeDefRow(
+                nodeDefId,
+                "Prototype Salvage Heap",
+                "consumer_salvage",
+                MaxGathers: 10),
+        };
+        var yields = new Dictionary<string, ResourceYieldRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceYieldRow(nodeDefId, "scrap_metal_bulk", Quantity: 1),
+        };
+        var registry = CreateRegistryFromRows(nodes, yields);
+        // Act
+        var found = registry.TryGetDefinition("not_a_real_node", out var def);
+        // Assert
+        Assert.False(found);
+        Assert.Null(def);
+    }
+
+    [Fact]
+    public void TryGetYield_ShouldReturnFalse_WhenNodeDefIdUnknown()
+    {
+        // Arrange
+        const string nodeDefId = "prototype_resource_node_alpha";
+        var nodes = new Dictionary<string, ResourceNodeDefRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceNodeDefRow(
+                nodeDefId,
+                "Prototype Salvage Heap",
+                "consumer_salvage",
+                MaxGathers: 10),
+        };
+        var yields = new Dictionary<string, ResourceYieldRow>(StringComparer.Ordinal)
+        {
+            [nodeDefId] = new ResourceYieldRow(nodeDefId, "scrap_metal_bulk", Quantity: 1),
+        };
+        var registry = CreateRegistryFromRows(nodes, yields);
+        // Act
+        var found = registry.TryGetYield("not_a_real_node", out var yield);
+        // Assert
+        Assert.False(found);
+        Assert.Null(yield);
+    }
+
+    [Fact]
+    public void GetDefinitionsInIdOrder_ShouldListAllRowsOrderedByNodeDefId_WhenMultipleNodes()
+    {
+        // Arrange
+        var nodes = new Dictionary<string, ResourceNodeDefRow>(StringComparer.Ordinal)
+        {
+            ["prototype_urban_bulk_delta"] = new ResourceNodeDefRow(
+                "prototype_urban_bulk_delta",
+                "Prototype Urban Bulk",
+                "urban_bulk",
+                MaxGathers: 10),
+            ["prototype_bio_mat_gamma"] = new ResourceNodeDefRow(
+                "prototype_bio_mat_gamma",
+                "Prototype Bio Mat",
+                "bio",
+                MaxGathers: 10),
+            ["prototype_resource_node_alpha"] = new ResourceNodeDefRow(
+                "prototype_resource_node_alpha",
+                "Prototype Salvage Heap",
+                "consumer_salvage",
+                MaxGathers: 10),
+            ["prototype_subsurface_vein_beta"] = new ResourceNodeDefRow(
+                "prototype_subsurface_vein_beta",
+                "Prototype Subsurface Vein",
+                "subsurface",
+                MaxGathers: 10),
+        };
+        var yields = new Dictionary<string, ResourceYieldRow>(StringComparer.Ordinal)
+        {
+            ["prototype_urban_bulk_delta"] = new ResourceYieldRow(
+                "prototype_urban_bulk_delta",
+                "scrap_metal_bulk",
+                Quantity: 5),
+            ["prototype_bio_mat_gamma"] = new ResourceYieldRow(
+                "prototype_bio_mat_gamma",
+                "scrap_metal_bulk",
+                Quantity: 3),
+            ["prototype_resource_node_alpha"] = new ResourceYieldRow(
+                "prototype_resource_node_alpha",
+                "scrap_metal_bulk",
+                Quantity: 1),
+            ["prototype_subsurface_vein_beta"] = new ResourceYieldRow(
+                "prototype_subsurface_vein_beta",
+                "scrap_metal_bulk",
+                Quantity: 2),
+        };
+        var registry = CreateRegistryFromRows(nodes, yields);
+        // Act
+        var list = registry.GetDefinitionsInIdOrder();
+        // Assert
+        Assert.Equal(4, list.Count);
+        Assert.Equal("prototype_bio_mat_gamma", list[0].NodeDefId);
+        Assert.Equal("prototype_resource_node_alpha", list[1].NodeDefId);
+        Assert.Equal("prototype_subsurface_vein_beta", list[2].NodeDefId);
+        Assert.Equal("prototype_urban_bulk_delta", list[3].NodeDefId);
+    }
+
+    [Fact]
+    public void TryGetDefinition_ShouldMatchLoaderCatalog_WhenUsingPrototypeFixture()
+    {
+        // Arrange
+        var root = Directory.CreateTempSubdirectory("neon-sprawl-resource-node-registry-loader-");
+        try
+        {
+            var resourceNodesDir = Path.Combine(root.FullName, "content", "resource-nodes");
+            var schemaDir = Path.Combine(root.FullName, "content", "schemas");
+            Directory.CreateDirectory(resourceNodesDir);
+            Directory.CreateDirectory(schemaDir);
+            var nodeSchemaPath = Path.Combine(schemaDir, "resource-node-def.schema.json");
+            var yieldSchemaPath = Path.Combine(schemaDir, "resource-yield-row.schema.json");
+            File.Copy(ResourceNodeCatalogTestPaths.DiscoverRepoResourceNodeDefSchemaPath(), nodeSchemaPath, overwrite: true);
+            File.Copy(ResourceNodeCatalogTestPaths.DiscoverRepoResourceYieldRowSchemaPath(), yieldSchemaPath, overwrite: true);
+            File.Copy(
+                Path.Combine(ResourceNodeCatalogTestPaths.DiscoverRepoResourceNodesDirectory(), "prototype_resource_nodes.json"),
+                Path.Combine(resourceNodesDir, "prototype_resource_nodes.json"),
+                overwrite: true);
+            File.Copy(
+                Path.Combine(ResourceNodeCatalogTestPaths.DiscoverRepoResourceNodesDirectory(), "prototype_resource_yields.json"),
+                Path.Combine(resourceNodesDir, "prototype_resource_yields.json"),
+                overwrite: true);
+            var itemIds = new HashSet<string>(StringComparer.Ordinal) { "scrap_metal_bulk" };
+            var loaded = ResourceNodeCatalogLoader.Load(
+                resourceNodesDir,
+                nodeSchemaPath,
+                yieldSchemaPath,
+                itemIds,
+                NullLogger.Instance);
+            var registry = new ResourceNodeDefinitionRegistry(loaded);
+            // Act
+            var ok = registry.TryGetDefinition("prototype_resource_node_alpha", out var node);
+            var yieldOk = registry.TryGetYield("prototype_resource_node_alpha", out var yield);
+            // Assert
+            Assert.True(ok);
+            Assert.NotNull(node);
+            Assert.Equal("consumer_salvage", node.GatherLens);
+            Assert.Equal(10, node.MaxGathers);
+            Assert.True(yieldOk);
+            Assert.NotNull(yield);
+            Assert.Equal("scrap_metal_bulk", yield.ItemId);
+            Assert.Equal(1, yield.Quantity);
+        }
+        finally
+        {
+            try
+            {
+                Directory.Delete(root.FullName, recursive: true);
+            }
+            catch (IOException)
+            {
+                // Best-effort: transient lock or race on some hosts; temp dir is unique per run.
+            }
+        }
+    }
+
+    [Fact]
+    public async Task Host_ShouldResolveRegistryFromDi_WhenStartupSucceeds()
+    {
+        // Arrange
+        await using var factory = new InMemoryWebApplicationFactory();
+        using var client = factory.CreateClient();
+        _ = await client.GetAsync("/health");
+        // Act
+        var registry = factory.Services.GetRequiredService<IResourceNodeDefinitionRegistry>();
+        var found = registry.TryGetDefinition("prototype_resource_node_alpha", out var node);
+        var yieldFound = registry.TryGetYield("prototype_resource_node_alpha", out var yield);
+        // Assert
+        Assert.True(found);
+        Assert.NotNull(node);
+        Assert.Equal("consumer_salvage", node.GatherLens);
+        Assert.Equal(10, node.MaxGathers);
+        Assert.True(yieldFound);
+        Assert.NotNull(yield);
+        Assert.Equal("scrap_metal_bulk", yield.ItemId);
+        Assert.Equal(1, yield.Quantity);
+    }
+}
diff --git a/server/NeonSprawl.Server/Game/Gathering/IResourceNodeDefinitionRegistry.cs b/server/NeonSprawl.Server/Game/Gathering/IResourceNodeDefinitionRegistry.cs
new file mode 100644
index 0000000..671b90e
--- /dev/null
+++ b/server/NeonSprawl.Server/Game/Gathering/IResourceNodeDefinitionRegistry.cs
@@ -0,0 +1,32 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace NeonSprawl.Server.Game.Gathering;
+
+/// <summary>
+/// Read-only access to validated resource-node definitions and yield rows loaded at startup
+/// (<see cref="ResourceNodeCatalog"/>).
+/// </summary>
+/// <remarks>
+/// <para><b>E3.M1 (gather / depletion / interact):</b> callers resolving node defs or yields should depend on this
+/// interface rather than <see cref="ResourceNodeCatalog"/> so gather lens, capacity, and yield metadata stay
+/// centralized.</para>
+/// <para><b>NEO-60:</b> HTTP/read-model projections should depend on this interface rather than reaching into the
+/// catalog.</para>
+/// </remarks>
+public interface IResourceNodeDefinitionRegistry
+{
+    /// <summary>
+    /// Attempts to resolve a node def by stable <c>nodeDefId</c> (see <c>resource-node-def.schema.json</c>).
+    /// Unknown ids and <c>null</c> return <c>false</c> without throwing.
+    /// </summary>
+    bool TryGetDefinition(string? nodeDefId, [NotNullWhen(true)] out ResourceNodeDefRow? definition);
+
+    /// <summary>
+    /// Attempts to resolve the fixed yield row for <paramref name="nodeDefId"/> (see
+    /// <c>resource-yield-row.schema.json</c>). Unknown ids and <c>null</c> return <c>false</c> without throwing.
+    /// </summary>
+    bool TryGetYield(string? nodeDefId, [NotNullWhen(true)] out ResourceYieldRow? yield);
+
+    /// <summary>Every loaded node definition, ordered by <see cref="ResourceNodeDefRow.NodeDefId"/> (ordinal).</summary>
+    IReadOnlyList<ResourceNodeDefRow> GetDefinitionsInIdOrder();
+}
diff --git a/server/NeonSprawl.Server/Game/Gathering/ResourceNodeCatalog.cs b/server/NeonSprawl.Server/Game/Gathering/ResourceNodeCatalog.cs
index 40558ad..9d1b6c4 100644
--- a/server/NeonSprawl.Server/Game/Gathering/ResourceNodeCatalog.cs
+++ b/server/NeonSprawl.Server/Game/Gathering/ResourceNodeCatalog.cs
@@ -2,7 +2,7 @@ using System.Collections.ObjectModel;
 
 namespace NeonSprawl.Server.Game.Gathering;
 
-/// <summary>In-memory resource-node catalog loaded at startup (NEO-58). Prefer registry in NEO-59 for game lookups.</summary>
+/// <summary>In-memory resource-node catalog loaded at startup (NEO-58). Game callers should use <see cref="IResourceNodeDefinitionRegistry"/>.</summary>
 public sealed class ResourceNodeCatalog(
     string resourceNodesDirectory,
     IReadOnlyDictionary<string, ResourceNodeDefRow> nodesById,
diff --git a/server/NeonSprawl.Server/Game/Gathering/ResourceNodeCatalogServiceCollectionExtensions.cs b/server/NeonSprawl.Server/Game/Gathering/ResourceNodeCatalogServiceCollectionExtensions.cs
index 5c5f47b..2fea0b1 100644
--- a/server/NeonSprawl.Server/Game/Gathering/ResourceNodeCatalogServiceCollectionExtensions.cs
+++ b/server/NeonSprawl.Server/Game/Gathering/ResourceNodeCatalogServiceCollectionExtensions.cs
@@ -6,10 +6,13 @@ using NeonSprawl.Server.Game.Skills;
 
 namespace NeonSprawl.Server.Game.Gathering;
 
-/// <summary>DI registration for the fail-fast resource-node catalog (NEO-58).</summary>
+/// <summary>DI registration for the fail-fast resource-node catalog and registry (NEO-58, NEO-59).</summary>
 public static class ResourceNodeCatalogServiceCollectionExtensions
 {
-    /// <summary>Binds <see cref="ContentPathsOptions"/> and registers <see cref="ResourceNodeCatalog"/> as a singleton.</summary>
+    /// <summary>
+    /// Binds <see cref="ContentPathsOptions"/> and registers <see cref="ResourceNodeCatalog"/> and
+    /// <see cref="IResourceNodeDefinitionRegistry"/> as singletons.
+    /// </summary>
     public static IServiceCollection AddResourceNodeCatalog(this IServiceCollection services, IConfiguration configuration)
     {
         services.AddOptions<ContentPathsOptions>()
@@ -45,6 +48,9 @@ public static class ResourceNodeCatalogServiceCollectionExtensions
                 logger);
         });
 
+        services.AddSingleton<IResourceNodeDefinitionRegistry>(sp =>
+            new ResourceNodeDefinitionRegistry(sp.GetRequiredService<ResourceNodeCatalog>()));
+
         return services;
     }
 }
diff --git a/server/NeonSprawl.Server/Game/Gathering/ResourceNodeDefinitionRegistry.cs b/server/NeonSprawl.Server/Game/Gathering/ResourceNodeDefinitionRegistry.cs
new file mode 100644
index 0000000..07aab07
--- /dev/null
+++ b/server/NeonSprawl.Server/Game/Gathering/ResourceNodeDefinitionRegistry.cs
@@ -0,0 +1,58 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace NeonSprawl.Server.Game.Gathering;
+
+/// <summary>Adapter over <see cref="ResourceNodeCatalog"/> (NEO-59).</summary>
+public sealed class ResourceNodeDefinitionRegistry(ResourceNodeCatalog catalog) : IResourceNodeDefinitionRegistry
+{
+    /// <inheritdoc />
+    public bool TryGetDefinition(string? nodeDefId, [NotNullWhen(true)] out ResourceNodeDefRow? definition)
+    {
+        if (nodeDefId is null)
+        {
+            definition = null;
+            return false;
+        }
+
+        if (catalog.NodesById.TryGetValue(nodeDefId, out var row))
+        {
+            definition = row;
+            return true;
+        }
+
+        definition = null;
+        return false;
+    }
+
+    /// <inheritdoc />
+    public bool TryGetYield(string? nodeDefId, [NotNullWhen(true)] out ResourceYieldRow? yield)
+    {
+        if (nodeDefId is null)
+        {
+            yield = null;
+            return false;
+        }
+
+        if (catalog.YieldsByNodeDefId.TryGetValue(nodeDefId, out var row))
+        {
+            yield = row;
+            return true;
+        }
+
+        yield = null;
+        return false;
+    }
+
+    /// <inheritdoc />
+    public IReadOnlyList<ResourceNodeDefRow> GetDefinitionsInIdOrder()
+    {
+        var ids = catalog.NodesById.Keys.OrderBy(k => k, StringComparer.Ordinal).ToArray();
+        var list = new List<ResourceNodeDefRow>(ids.Length);
+        foreach (var id in ids)
+        {
+            list.Add(catalog.NodesById[id]);
+        }
+
+        return list;
+    }
+}