diff --git a/packages/agentctx/src/mcp/tools.ts b/packages/agentctx/src/mcp/tools.ts
index 7f2f3c8..ee13d6d 100644
--- a/packages/agentctx/src/mcp/tools.ts
+++ b/packages/agentctx/src/mcp/tools.ts
@@ -354,7 +354,9 @@ export function toolDefinitions(): ToolDefinition[] {
           ids: {
             type: "array",
             items: { type: "string" },
-            description: `Record ids from ctx_search/ctx_related (max ${GET_IDS_MAX})`,
+            minItems: 1,
+            maxItems: GET_IDS_MAX,
+            description: `Record ids from ctx_search/ctx_related (at least 1, max ${GET_IDS_MAX})`,
           },
         },
         required: ["ids"],
diff --git a/packages/agentctx/test/mcp/tools.test.ts b/packages/agentctx/test/mcp/tools.test.ts
index e399850..1cd5e9f 100644
--- a/packages/agentctx/test/mcp/tools.test.ts
+++ b/packages/agentctx/test/mcp/tools.test.ts
@@ -207,6 +207,14 @@ describe("ctx_search", () => {
 });
 
 describe("ctx_get", () => {
+  it("declares minItems/maxItems bounds on the ids schema", () => {
+    const schema = tools.find((tool) => tool.name === "ctx_get");
+    const ids = (schema?.inputSchema as { properties: { ids: Record<string, unknown> } })
+      .properties.ids;
+    expect(ids.minItems).toBe(1);
+    expect(ids.maxItems).toBe(GET_IDS_MAX);
+  });
+  
   it("advertises the same id cap as GET_IDS_MAX", () => {
     const schema = tools.find((tool) => tool.name === "ctx_get");
     expect(schema?.description).toContain(`at most ${String(GET_IDS_MAX)} per call`);