diff --git a/.changeset/global-synonym-sets.md b/.changeset/global-synonym-sets.md
new file mode 100644
index 0000000..b849d38
--- /dev/null
+++ b/.changeset/global-synonym-sets.md
@@ -0,0 +1,6 @@
+---
+"@typesensekit/cli": patch
+"@typesensekit/mcp": patch
+---
+
+Add first-class global synonym set operations and guidance from collection synonym 404s.
diff --git a/README.md b/README.md
index f0e61d3..ca6df56 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,13 @@ TypesenseKit covers the common Typesense administration and search surfaces, plu
 | System | health, metrics, stats, debug |
 | Escape hatch | raw HTTP calls through `api.call` |
 
+Typesense v30 global synonym sets are available through `synonym_sets.*`:
+
+```sh
+tsk synonym_sets.list --input '{}' --json
+tsk synonym_sets.items.list --input '{"name":"products-core"}' --json
+```
+
 ## Why It Exists
 
 Typesense work often jumps between dashboards, one-off scripts, local curl commands, and agent experiments. TypesenseKit keeps those workflows on one command and one tool registry:
diff --git a/packages/cli/src/operation-docs.ts b/packages/cli/src/operation-docs.ts
index a192bf6..fcbb08d 100644
--- a/packages/cli/src/operation-docs.ts
+++ b/packages/cli/src/operation-docs.ts
@@ -87,8 +87,22 @@ const EXAMPLES: Record<string, JsonValue[]> = {
   "synonyms.create": [
     {
       collection: "products",
-      id: "sofa-couch",
-      synonyms: ["sofa", "couch"],
+      name: "sofa-couch",
+      value: { synonyms: ["sofa", "couch"] },
+    },
+  ],
+  "synonym_sets.list": [{}],
+  "synonym_sets.create": [
+    {
+      name: "products-core",
+      value: {
+        items: [{ id: "sofa-couch", synonyms: ["sofa", "couch"] }],
+      },
+    },
+  ],
+  "synonym_sets.items.list": [
+    {
+      name: "products-core",
     },
   ],
 };
diff --git a/packages/core/src/operations/index.test.ts b/packages/core/src/operations/index.test.ts
index 111448e..0efc4cc 100644
--- a/packages/core/src/operations/index.test.ts
+++ b/packages/core/src/operations/index.test.ts
@@ -17,6 +17,8 @@ describe("operation registry", () => {
         "collections.fields.add",
         "collections.fields.drop",
         "collections.fields.replace",
+        "synonym_sets.list",
+        "synonym_sets.items.list",
         "api.call",
         "health",
       ]),
diff --git a/packages/core/src/operations/index.ts b/packages/core/src/operations/index.ts
index e188d73..afd7883 100644
--- a/packages/core/src/operations/index.ts
+++ b/packages/core/src/operations/index.ts
@@ -9,6 +9,7 @@ import { overridesOperations } from "./overrides.js";
 import { presetsOperations } from "./presets.js";
 import { searchOperations } from "./search.js";
 import { stopwordsOperations } from "./stopwords.js";
+import { synonymSetOperations } from "./synonym-sets.js";
 import { synonymsOperations } from "./synonyms.js";
 import { systemOperations } from "./system.js";
 import type { Operation } from "./types.js";
@@ -19,6 +20,7 @@ export const operations = [
   ...searchOperations,
   ...aliasesOperations,
   ...synonymsOperations,
+  ...synonymSetOperations,
   ...overridesOperations,
   ...keysOperations,
   ...analyticsOperations,
diff --git a/packages/core/src/operations/synonym-sets.ts b/packages/core/src/operations/synonym-sets.ts
new file mode 100644
index 0000000..8a8b8bd
--- /dev/null
+++ b/packages/core/src/operations/synonym-sets.ts
@@ -0,0 +1,84 @@
+import { z } from "zod";
+import { api, enc } from "./http.js";
+import type { Operation } from "./types.js";
+
+function base(name?: string): string {
+  return name ? `/synonym_sets/${enc(name)}` : "/synonym_sets";
+}
+
+function itemPath(name: string, id?: string): string {
+  const path = `${base(name)}/items`;
+  return id ? `${path}/${enc(id)}` : path;
+}
+
+export const synonymSetOperations = [
+  {
+    name: "synonym_sets.list",
+    summary: "List global synonym sets",
+    category: "synonyms",
+    input: z.object({}),
+    execute: async (client) => api(client).get(base()),
+  },
+  {
+    name: "synonym_sets.create",
+    summary: "Create or upsert a global synonym set",
+    category: "synonyms",
+    input: z.object({
+      name: z.string(),
+      value: z.object({
+        items: z.array(z.record(z.unknown())),
+      }),
+    }),
+    execute: async (client, input) =>
+      api(client).put(base(input.name), input.value),
+  },
+  {
+    name: "synonym_sets.retrieve",
+    summary: "Retrieve a global synonym set",
+    category: "synonyms",
+    input: z.object({ name: z.string() }),
+    execute: async (client, input) => api(client).get(base(input.name)),
+  },
+  {
+    name: "synonym_sets.delete",
+    summary: "Delete a global synonym set",
+    category: "synonyms",
+    input: z.object({ name: z.string() }),
+    execute: async (client, input) => api(client).delete(base(input.name)),
+  },
+  {
+    name: "synonym_sets.items.list",
+    summary: "List items in a global synonym set",
+    category: "synonyms",
+    input: z.object({ name: z.string() }),
+    execute: async (client, input) => api(client).get(itemPath(input.name)),
+  },
+  {
+    name: "synonym_sets.items.create",
+    summary: "Create or upsert an item in a global synonym set",
+    category: "synonyms",
+    input: z.object({
+      name: z.string(),
+      id: z.string(),
+      value: z.record(z.unknown()),
+    }),
+    execute: async (client, input) =>
+      api(client).put(itemPath(input.name, input.id), input.value),
+  },
+  {
+    name: "synonym_sets.items.retrieve",
+    summary: "Retrieve an item in a global synonym set",
+    category: "synonyms",
+    input: z.object({ name: z.string(), id: z.string() }),
+    execute: async (client, input) =>
+      api(client).get(itemPath(input.name, input.id)),
+  },
+  {
+    name: "synonym_sets.items.delete",
+    summary: "Delete an item in a global synonym set",
+    category: "synonyms",
+    input: z.object({ name: z.string(), id: z.string() }),
+    execute: async (client, input) =>
+      api(client).delete(itemPath(input.name, input.id)),
+  },
+] satisfies Operation<z.ZodTypeAny, unknown>[];
diff --git a/packages/core/src/operations/synonyms.test.ts b/packages/core/src/operations/synonyms.test.ts
new file mode 100644
index 0000000..2fac577
--- /dev/null
+++ b/packages/core/src/operations/synonyms.test.ts
@@ -0,0 +1,81 @@
+import { describe, expect, it, vi } from "vitest";
+import type { TypesenseClient } from "../client.js";
+import { synonymSetOperations } from "./synonym-sets.js";
+import { synonymsOperations } from "./synonyms.js";
+
+function getSynonymOperation(name: string) {
+  const operation = synonymsOperations.find(
+    (candidate) => candidate.name === name,
+  );
+  if (!operation) throw new Error(`${name} not found`);
+  return operation;
+}
+
+function getSynonymSetOperation(name: string) {
+  const operation = synonymSetOperations.find(
+    (candidate) => candidate.name === name,
+  );
+  if (!operation) throw new Error(`${name} not found`);
+  return operation;
+}
+
+describe("synonym set operations", () => {
+  it("lists global synonym sets", async () => {
+    const listOperation = getSynonymSetOperation("synonym_sets.list");
+    const get = vi.fn().mockResolvedValue({ synonym_sets: [] });
+    const client = { apiCall: { get } } as unknown as TypesenseClient;
+
+    await listOperation.execute(client, listOperation.input.parse({}));
+
+    expect(get).toHaveBeenCalledWith("/synonym_sets");
+  });
+
+  it("creates global synonym sets with items", async () => {
+    const createOperation = getSynonymSetOperation("synonym_sets.create");
+    const put = vi.fn().mockResolvedValue({ ok: true });
+    const client = { apiCall: { put } } as unknown as TypesenseClient;
+    const value = {
+      items: [{ id: "sofa-couch", synonyms: ["sofa", "couch"] }],
+    };
+
+    await createOperation.execute(
+      client,
+      createOperation.input.parse({ name: "products-core", value }),
+    );
+
+    expect(put).toHaveBeenCalledWith("/synonym_sets/products-core", value);
+  });
+
+  it("lists items in a global synonym set", async () => {
+    const listOperation = getSynonymSetOperation("synonym_sets.items.list");
+    const get = vi.fn().mockResolvedValue({ items: [] });
+    const client = { apiCall: { get } } as unknown as TypesenseClient;
+
+    await listOperation.execute(
+      client,
+      listOperation.input.parse({ name: "products-core" }),
+    );
+
+    expect(get).toHaveBeenCalledWith("/synonym_sets/products-core/items");
+  });
+
+  it("points collection synonym 404s to linked global synonym sets", async () => {
+    const listOperation = getSynonymOperation("synonyms.list");
+    const get = vi
+      .fn()
+      .mockRejectedValueOnce({ httpStatus: 404 })
+      .mockResolvedValueOnce({ synonym_sets: ["products-core"] });
+    const client = { apiCall: { get } } as unknown as TypesenseClient;
+
+    await expect(
+      listOperation.execute(
+        client,
+        listOperation.input.parse({ collection: "products" }),
+      ),
+    ).rejects.toThrow(
+      "This collection is linked to global synonym sets: products-core.",
+    );
+    expect(get).toHaveBeenNthCalledWith(1, "/collections/products/synonyms");
+    expect(get).toHaveBeenNthCalledWith(2, "/collections/products");
+  });
+});
diff --git a/packages/core/src/operations/synonyms.ts b/packages/core/src/operations/synonyms.ts
index e8a7e4f..ae3448f 100644
--- a/packages/core/src/operations/synonyms.ts
+++ b/packages/core/src/operations/synonyms.ts
@@ -2,14 +2,63 @@ import { z } from "zod";
 import { api, collectionPath, enc } from "./http.js";
 import type { Operation } from "./types.js";
 
+type CollectionSchema = {
+  synonym_sets?: unknown;
+};
+
+type ErrorWithStatus = {
+  httpStatus?: unknown;
+  status?: unknown;
+};
+
+function isNotFound(error: unknown): boolean {
+  if (typeof error !== "object" || error === null) return false;
+  const { httpStatus, status } = error as ErrorWithStatus;
+  return httpStatus === 404 || status === 404;
+}
+
+function synonymSetNames(collection: CollectionSchema): string[] {
+  return Array.isArray(collection.synonym_sets)
+    ? collection.synonym_sets.filter(
+        (name): name is string => typeof name === "string",
+      )
+    : [];
+}
+
+function globalSynonymGuidance(collection: string, sets: string[]): string {
+  return [
+    `Collection-level synonyms are unavailable for ${collection}.`,
+    sets.length > 0
+      ? `This collection is linked to global synonym sets: ${sets.join(", ")}.`
+      : "This Typesense version may use global synonym sets.",
+    "Use synonym_sets.list to inspect global synonym sets:",
+    "tsk synonym_sets.list --input '{}' --json",
+  ].join("\n");
+}
+
 export const synonymsOperations = [
   {
     name: "synonyms.list",
     summary: "List synonyms",
     category: "synonyms",
     input: z.object({ collection: z.string() }),
-    execute: async (client, input) =>
-      api(client).get(`${collectionPath(input.collection)}/synonyms`),
+    execute: async (client, input) => {
+      const request = api(client);
+      try {
+        return await request.get(
+          `${collectionPath(input.collection)}/synonyms`,
+        );
+      } catch (error) {
+        if (!isNotFound(error)) throw error;
+
+        const collection = await request.get<CollectionSchema>(
+          collectionPath(input.collection),
+        );
+        throw new Error(
+          globalSynonymGuidance(input.collection, synonymSetNames(collection)),
+        );
+      }
+    },
   },
   {
     name: "synonyms.create",