diff --git a/client/app.js b/client/app.js
index 9b36abf..2d2da83 100644
--- a/client/app.js
+++ b/client/app.js
@@ -357,6 +357,17 @@ export class App extends decorate(class {}) {
         this.stage.camera = camera;
         // Avoid the initial 'lerp.
         camera.realPosition = camera.position;
+        // Manage held item.
+        entity.on('activeSlotIndexChanged', (oldIndex, newIndex) => {
+          const oldItem = entity.itemInSlot(oldIndex);
+          if (oldItem) {
+            oldItem.wielder = null;
+          }
+          const newItem = entity.itemInSlot(newIndex);
+          if (newItem) {
+            newItem.wielder = entity;
+          }
+        });
       }
     }
   }
diff --git a/common/traits/item.trait.js b/common/traits/item.trait.js
index 3743772..9eaa747 100644
--- a/common/traits/item.trait.js
+++ b/common/traits/item.trait.js
@@ -1,9 +1,15 @@
 import {behaviorItemFromJSON} from '@avocado/behavior';
-import {compose, TickingPromise} from '@avocado/core';
+import {compose, Property, TickingPromise} from '@avocado/core';
 import {StateProperty, Trait} from '@avocado/entity';
 import {Image} from '@avocado/graphics';
 
 const decorate = compose(
+  Property('wielder', {
+    track: true,
+    emit: function (...args) {
+      this.entity.emit(...args);
+    },
+  }),
   StateProperty('qty', {
     track: true,
   }),
diff --git a/common/traits/tool.trait.js b/common/traits/tool.trait.js
new file mode 100644
index 0000000..155f119
--- /dev/null
+++ b/common/traits/tool.trait.js
@@ -0,0 +1,181 @@
+import {compose} from '@avocado/core';
+import {StateProperty, Trait} from '@avocado/entity';
+import {Color, Primitives} from '@avocado/graphics';
+import {Rectangle, Vector} from '@avocado/math';
+
+const decorate = compose(
+);
+
+// Tools.
+export class Tool extends decorate(Trait) {
+
+  static defaultParams() {
+    return {
+      target: {
+        type: 'projection',
+        distance: 1,
+        length: 1,
+        width: 1,
+      },
+    };
+  }
+
+  static type() {
+    return 'tool';
+  }
+
+  constructor(entity, params, state) {
+    super(entity, params, state);
+    if (AVOCADO_CLIENT) {
+      this.guidePrimitives = new Primitives();
+    }
+    if (1 !== this.params.target.length % 2) {
+      throw new Error("Tool::params.target.length must be odd!");
+    }
+    if (1 !== this.params.target.width % 2) {
+      throw new Error("Tool::params.target.width must be odd!");
+    }
+    this.targets = [];
+  }
+
+  calculateTargetStart() {
+    const wielder = this.entity.wielder;
+    if (!wielder) {
+      return;
+    }
+    if (!wielder.is('directional')) {
+      return;
+    }
+    if (!wielder.is('layered')) {
+      return;
+    }
+    const tile = Vector.floor(wielder.tile);
+    const distance = this.params.target.distance;
+    return Vector.add(
+      tile,
+      Vector.directionalProjection(wielder.direction, [0, distance]),
+    );
+  }
+
+  calculateTargets() {
+    this.targets = [];
+    const wielder = this.entity.wielder;
+    if (!wielder) {
+      return;
+    }
+    if (!wielder.is('layered')) {
+      return;
+    }
+    const layer = wielder.layer;
+    if (!layer) {
+      return;
+    }
+    const tile = Vector.floor(wielder.tile);
+    const tileset = layer.tileset;
+    if (!tileset) {
+      return;
+    }
+    if (!wielder.is('directional')) {
+      return;
+    }
+    const direction = wielder.direction;
+    const start = this.calculateTargetStart();
+    const width = (this.params.target.width - 1) / 2;
+    for (let i = -width; i < (width + 1); ++i) {
+      for (let j = 0; j < this.params.target.length; ++j) {
+        this.targets.push(Vector.add(
+          start,
+          Vector.directionalProjection(direction, [i, j]),
+        ));
+      }
+    }
+  }
+
+  onWielderDirectionChanged() {
+    this.calculateTargets();
+    this.renderPrimitives();
+  }
+
+  onWielderPositionChanged() {
+    this.repositionPrimitives();
+  }
+
+  renderPrimitives() {
+    this.guidePrimitives.clear();
+    const wielder = this.entity.wielder;
+    if (!wielder) {
+      return;
+    }
+    if (!wielder.is('layered')) {
+      return;
+    }
+    const layer = wielder.layer;
+    if (!layer) {
+      return;
+    }
+    const tile = Vector.floor(wielder.tile);
+    const tileset = layer.tileset;
+    if (!tileset) {
+      return;
+    }
+    const tileSize = tileset.tileSize;
+    for (let i = 0; i < this.targets.length; ++i) {
+      const target = this.targets[i];
+      const relativeTarget = Vector.sub(target, tile);
+      const scaledRelativeTarget = Vector.mul(relativeTarget, tileSize);
+      this.guidePrimitives.drawRectangle(
+        Rectangle.compose(scaledRelativeTarget, tileSize),
+        Primitives.lineStyle(new Color(255, 255, 255), 1),
+      );
+    }
+  }
+
+  repositionPrimitives() {
+    const wielder = this.entity.wielder;
+    if (!wielder) {
+      return;
+    }
+    if (!wielder.is('layered')) {
+      return;
+    }
+    this.guidePrimitives.position = Vector.scale(wielder.tileOffset, -1);
+  }
+
+  listeners() {
+    return {
+
+      wielderChanged: (oldWielder, newWielder) => {
+        if (oldWielder && oldWielder.is('visible')) {
+          oldWielder.off(
+            'positionChanged',
+            this.onWielderPositionChanged,
+          );
+          oldWielder.off(
+            'directionChanged',
+            this.onWielderDirectionChanged,
+          );
+          oldWielder.container.removeChild(this.guidePrimitives);
+        }
+        if (newWielder && newWielder.is('visible')) {
+          newWielder.on(
+            'positionChanged',
+            this.onWielderPositionChanged,
+            this,
+          );
+          newWielder.on(
+            'directionChanged',
+            this.onWielderDirectionChanged,
+            this,
+          );
+          newWielder.container.addChild(this.guidePrimitives);
+        }
+        this.calculateTargets();
+        this.renderPrimitives();
+        this.repositionPrimitives();
+      },
+
+    };
+  }
+
+}
+
diff --git a/resource/hoe.png b/resource/hoe.png
new file mode 100644
index 0000000..a0de610
Binary files /dev/null and b/resource/hoe.png differ
diff --git a/server/create-entity-for-connection.js b/server/create-entity-for-connection.js
index d3a77de..e7411ea 100644
--- a/server/create-entity-for-connection.js
+++ b/server/create-entity-for-connection.js
@@ -70,6 +70,10 @@ export function createEntityForConnection(socket) {
               qty: 1,
               uri: '/rock.entity.json',
             },
+            2: {
+              qty: 1,
+              uri: '/hoe.entity.json',
+            },
           },
         },
       },
diff --git a/server/create-fixtures.js b/server/create-fixtures.js
index 0655124..c5b28f2 100644
--- a/server/create-fixtures.js
+++ b/server/create-fixtures.js
@@ -30,6 +30,8 @@ import {potionJSON} from './fixtures/potion.entity';
 writeFixture('potion.entity.json', potionJSON());
 import {rockJSON} from './fixtures/rock.entity';
 writeFixture('rock.entity.json', rockJSON());
+import {hoeJSON} from './fixtures/hoe.entity';
+writeFixture('hoe.entity.json', hoeJSON());
 // Write rooms.
 import {kittyFireJSON} from './fixtures/kitty-fire.room';
 writeFixture('kitty-fire.room.json', kittyFireJSON());
diff --git a/server/fixtures/hoe.entity.js b/server/fixtures/hoe.entity.js
new file mode 100644
index 0000000..af5d418
--- /dev/null
+++ b/server/fixtures/hoe.entity.js
@@ -0,0 +1,25 @@
+// Hoe.
+export function hoeJSON() {
+  return {
+    traits: {
+      existent: {},
+      item: {
+        params: {
+          slotImages: {
+            default: '/hoe.png',
+          },
+        },
+      },
+      tool: {
+        params: {
+          target: {
+            type: 'projection',
+            distance: 1,
+            length: 3,
+            width: 1,
+          },
+        },
+      },
+    },
+  };
+}