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MCP 2026-07-28 allows structuredContent to be any JSON value, including arrays and null. callTool() rejected non-object values, failing the whole tool call. CallToolResult.structuredContent is now unknown, and MCP tools without an output schema declare structuredContent as unknown to codemode. refs #10416
39 lines
1.9 KiB
TypeScript
39 lines
1.9 KiB
TypeScript
import { describe, expect, it } from "vitest";
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import { type ContentBlock, toLlmContent } from "../src/index.ts";
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describe("toLlmContent", () => {
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it("passes text and images through and replaces other blocks with text", () => {
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const blocks: ContentBlock[] = [
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{ type: "text", text: "hello", annotations: { priority: 1 } },
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{ type: "image", data: "aW1n", mimeType: "image/png", _meta: { x: 1 } },
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{ type: "audio", data: "YXVk", mimeType: "audio/wav" },
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{ type: "resource_link", uri: "file:///a.txt", name: "a.txt" },
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{ type: "resource", resource: { uri: "file:///b.txt", text: "inline" } },
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{ type: "resource", resource: { uri: "file:///c.png", mimeType: "image/png", blob: "Yw==" } },
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{ type: "resource", resource: { uri: "file:///d.bin", blob: "ZA==" } },
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];
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expect(toLlmContent({ content: blocks })).toEqual([
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{ type: "text", text: "hello" },
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{ type: "image", data: "aW1n", mimeType: "image/png" },
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{ type: "text", text: "[audio audio/wav omitted]" },
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{ type: "text", text: "a.txt: file:///a.txt" },
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{ type: "text", text: "inline" },
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{ type: "image", data: "Yw==", mimeType: "image/png" },
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{ type: "text", text: "[binary resource file:///d.bin (unknown type) omitted]" },
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]);
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});
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it("falls back to the structured content as JSON when there are no blocks", () => {
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// #10416: structured content may be any JSON value.
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expect(toLlmContent({ content: [], structuredContent: [1, 2] })).toEqual([
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{ type: "text", text: "[\n 1,\n 2\n]" },
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]);
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expect(toLlmContent({ content: [], structuredContent: null })).toEqual([{ type: "text", text: "null" }]);
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expect(toLlmContent({ content: [], structuredContent: { n: 1 } })).toEqual([
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{ type: "text", text: '{\n "n": 1\n}' },
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]);
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expect(toLlmContent({ content: [{ type: "text", text: "n=1" }], structuredContent: { n: 1 } })).toEqual([
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{ type: "text", text: "n=1" },
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]);
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});
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});
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