diff --git a/src/functions/context.ts b/src/functions/context.ts
index c258a45b..8a25f9b8 100644
--- a/src/functions/context.ts
+++ b/src/functions/context.ts
@@ -5,11 +5,17 @@ import type {
   SessionSummary,
   ContextBlock,
   ProjectProfile,
+  MemorySlot,
 } from "../types.js";
 import { KV } from "../state/schema.js";
 import { StateKV } from "../state/kv.js";
 import { recordAccessBatch } from "./access-tracker.js";
 import { logger } from "../logger.js";
+import {
+  isSlotsEnabled,
+  listPinnedSlots,
+  renderPinnedContext,
+} from "./slots.js";
 
 function estimateTokens(text: string): number {
   return Math.ceil(text.length / 3);
@@ -33,9 +39,24 @@ export function registerContextFunction(
       const budget = data.budget || tokenBudget;
       const blocks: ContextBlock[] = [];
 
-      const profile = await kv
-        .get<ProjectProfile>(KV.profiles, data.project)
-        .catch(() => null);
+      const [pinnedSlots, profile] = await Promise.all([
+        isSlotsEnabled()
+          ? listPinnedSlots(kv).catch(() => [] as MemorySlot[])
+          : Promise.resolve([] as MemorySlot[]),
+        kv
+          .get<ProjectProfile>(KV.profiles, data.project)
+          .catch(() => null),
+      ]);
+
+      const slotContent = renderPinnedContext(pinnedSlots);
+      if (slotContent) {
+        blocks.push({
+          type: "memory",
+          content: slotContent,
+          tokens: estimateTokens(slotContent),
+          recency: Date.now(),
+        });
+      }
       if (profile) {
         const profileParts = [];
         if (profile.topConcepts.length > 0) {
diff --git a/test/context-slots.test.ts b/test/context-slots.test.ts
new file mode 100644
index 00000000..808597c4
--- /dev/null
+++ b/test/context-slots.test.ts
@@ -0,0 +1,177 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
+import { registerContextFunction } from "../src/functions/context.js";
+import { KV } from "../src/state/schema.js";
+
+function mockKV() {
+  const store = new Map<string, Map<string, unknown>>();
+  return {
+    get: async <T>(scope: string, key: string): Promise<T | null> => {
+      return (store.get(scope)?.get(key) as T) ?? null;
+    },
+    set: async <T>(scope: string, key: string, data: T): Promise<T> => {
+      if (!store.has(scope)) store.set(scope, new Map());
+      store.get(scope)!.set(key, data);
+      return data;
+    },
+    delete: async (scope: string, key: string): Promise<void> => {
+      store.get(scope)?.delete(key);
+    },
+    list: async <T>(scope: string): Promise<T[]> => {
+      if (!store.has(scope)) return [];
+      return Array.from(store.get(scope)!.values()) as T[];
+    },
+  };
+}
+
+type ContextHandler = (data: {
+  sessionId: string;
+  project: string;
+  budget?: number;
+}) => Promise<{ context: string; blocks: number; tokens: number }>;
+
+function wireContext(kv: ReturnType<typeof mockKV>) {
+  let handler: ContextHandler | undefined;
+  const sdk = {
+    registerFunction: vi.fn((id: string, cb: ContextHandler) => {
+      if (id === "mem::context") handler = cb;
+    }),
+  } as unknown as import("iii-sdk").ISdk;
+  registerContextFunction(sdk, kv as never, 2000);
+  if (!handler) throw new Error("mem::context not registered");
+  return handler;
+}
+
+async function seedPinnedSlot(
+  kv: ReturnType<typeof mockKV>,
+  label: string,
+  content: string,
+  scope: "project" | "global" = "global",
+) {
+  const target = scope === "global" ? KV.globalSlots : KV.slots;
+  await kv.set(target, label, {
+    label,
+    content,
+    description: "",
+    sizeLimit: 2000,
+    pinned: true,
+    readOnly: false,
+    scope,
+    createdAt: new Date().toISOString(),
+    updatedAt: new Date().toISOString(),
+  });
+}
+
+describe("mem::context — pinned slot injection", () => {
+  const ORIGINAL_SLOTS_ENV = process.env["AGENTMEMORY_SLOTS"];
+
+  afterEach(() => {
+    if (ORIGINAL_SLOTS_ENV === undefined) {
+      delete process.env["AGENTMEMORY_SLOTS"];
+    } else {
+      process.env["AGENTMEMORY_SLOTS"] = ORIGINAL_SLOTS_ENV;
+    }
+  });
+
+  describe("when AGENTMEMORY_SLOTS=true", () => {
+    let kv: ReturnType<typeof mockKV>;
+    let handler: ContextHandler;
+
+    beforeEach(() => {
+      process.env["AGENTMEMORY_SLOTS"] = "true";
+      kv = mockKV();
+      handler = wireContext(kv);
+    });
+
+    it("includes pinned global slot content in returned context", async () => {
+      await seedPinnedSlot(kv, "tool_guidelines", "rule-alpha", "global");
+
+      const result = await handler({
+        sessionId: "ses_a",
+        project: "/tmp/proj",
+      });
+
+      expect(result.context).toContain("tool_guidelines");
+      expect(result.context).toContain("rule-alpha");
+      expect(result.blocks).toBeGreaterThan(0);
+    });
+
+    it("renders multiple pinned slots, sorted by label", async () => {
+      await seedPinnedSlot(kv, "user_preferences", "pref-alpha", "global");
+      await seedPinnedSlot(kv, "tool_guidelines", "rule-alpha", "global");
+
+      const result = await handler({
+        sessionId: "ses_b",
+        project: "/tmp/proj",
+      });
+
+      const guidelinesIdx = result.context.indexOf("tool_guidelines");
+      const prefsIdx = result.context.indexOf("user_preferences");
+      expect(guidelinesIdx).toBeGreaterThan(-1);
+      expect(prefsIdx).toBeGreaterThan(-1);
+      expect(guidelinesIdx).toBeLessThan(prefsIdx);
+    });
+
+    it("skips unpinned slots even when they have content", async () => {
+      await kv.set(KV.globalSlots, "self_notes", {
+        label: "self_notes",
+        content: "unpinned-content-alpha",
+        description: "",
+        sizeLimit: 1500,
+        pinned: false,
+        readOnly: false,
+        scope: "global",
+        createdAt: new Date().toISOString(),
+        updatedAt: new Date().toISOString(),
+      });
+
+      const result = await handler({
+        sessionId: "ses_c",
+        project: "/tmp/proj",
+      });
+
+      expect(result.context).not.toContain("unpinned-content-alpha");
+    });
+
+    it("skips empty pinned slots (the seeded defaults)", async () => {
+      await seedPinnedSlot(kv, "persona", "", "global");
+
+      const result = await handler({
+        sessionId: "ses_d",
+        project: "/tmp/proj",
+      });
+
+      expect(result.context).not.toContain("persona");
+    });
+
+    it("project-scoped slot shadows global slot with the same label", async () => {
+      await seedPinnedSlot(kv, "tool_guidelines", "global-value", "global");
+      await seedPinnedSlot(kv, "tool_guidelines", "project-value", "project");
+
+      const result = await handler({
+        sessionId: "ses_e",
+        project: "/tmp/proj",
+      });
+
+      expect(result.context).toContain("project-value");
+      expect(result.context).not.toContain("global-value");
+    });
+  });
+
+  describe("when AGENTMEMORY_SLOTS is off", () => {
+    it("does not include any slot content", async () => {
+      delete process.env["AGENTMEMORY_SLOTS"];
+      const kv = mockKV();
+      const handler = wireContext(kv);
+
+      await seedPinnedSlot(kv, "tool_guidelines", "rule-alpha", "global");
+
+      const result = await handler({
+        sessionId: "ses_f",
+        project: "/tmp/proj",
+      });
+
+      expect(result.context).not.toContain("tool_guidelines");
+      expect(result.context).not.toContain("rule-alpha");
+    });
+  });
+});