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import type { Logger } from "@dispatch/kernel";
import { describe, expect, it } from "vitest";
import { adaptTool, flattenContent, namespace } from "./registry.js";
import type { McpCallResult, McpContentItem, McpToolCaller, McpToolInfo } from "./types.js";
const mockSpan = {
id: "span-1",
log: {} as Logger,
setAttributes: () => {},
addLink: () => {},
child: () => mockSpan,
end: () => {},
};
const mockLogger: Logger = {
info: () => {},
warn: () => {},
error: () => {},
debug: () => {},
child: () => mockLogger,
span: () => mockSpan,
};
/**
* A real, minimal McpToolCaller collaborator (not a mock of McpClient).
* It records calls and returns a configurable result.
*/
function makeCaller(
result: McpCallResult,
): McpToolCaller & { calls: Array<{ name: string; args: unknown }> } {
const calls: Array<{ name: string; args: unknown }> = [];
return {
calls,
callTool: async (name: string, args: unknown) => {
calls.push({ name, args });
return result;
},
};
}
describe("namespace", () => {
it("produces <serverId>__<toolName>", () => {
expect(namespace("freecad", "create_object")).toBe("freecad__create_object");
});
it("handles serverId with special chars", () => {
expect(namespace("chrome-devtools", "navigate")).toBe("chrome-devtools__navigate");
});
it("handles empty toolName", () => {
expect(namespace("server", "")).toBe("server__");
});
});
describe("flattenContent", () => {
it("flattens text content", () => {
const content: McpContentItem[] = [{ type: "text", text: "hello world" }];
expect(flattenContent(content)).toBe("hello world");
});
it("flattens image content", () => {
const content: McpContentItem[] = [
{ type: "image", data: "base64data", mimeType: "image/png" },
];
expect(flattenContent(content)).toBe("[image: image/png]");
});
it("flattens resource content with text", () => {
const content: McpContentItem[] = [
{ type: "resource", resource: { uri: "file:///test", text: "resource text" } },
];
expect(flattenContent(content)).toBe("resource text");
});
it("flattens resource content without text", () => {
const content: McpContentItem[] = [{ type: "resource", resource: { uri: "file:///test" } }];
expect(flattenContent(content)).toBe("[resource: file:///test]");
});
it("joins multiple items with newline", () => {
const content: McpContentItem[] = [
{ type: "text", text: "first" },
{ type: "text", text: "second" },
];
expect(flattenContent(content)).toBe("first\nsecond");
});
it("returns empty string for empty content", () => {
expect(flattenContent([])).toBe("");
});
it("handles mixed content types", () => {
const content: McpContentItem[] = [
{ type: "text", text: "here is an image:" },
{ type: "image", data: "data", mimeType: "image/jpeg" },
{ type: "resource", resource: { uri: "file:///x", text: "some data" } },
];
expect(flattenContent(content)).toBe("here is an image:\n[image: image/jpeg]\nsome data");
});
});
describe("adaptTool", () => {
it("maps inputSchema to ToolParameterSchema", () => {
const mcpTool: McpToolInfo = {
name: "create_obj",
description: "Create an object",
inputSchema: {
type: "object",
properties: { name: { type: "string", description: "Object name" } },
required: ["name"],
},
};
const caller = makeCaller({ content: [] });
const adapted = adaptTool("freecad", mcpTool, caller);
expect(adapted.name).toBe("freecad__create_obj");
expect(adapted.description).toBe("[freecad] Create an object");
expect(adapted.parameters.type).toBe("object");
expect(adapted.parameters.properties).toEqual({
name: { type: "string", description: "Object name" },
});
expect(adapted.parameters.required).toEqual(["name"]);
expect(adapted.concurrencySafe).toBe(false);
});
it("execute proxies to callTool", async () => {
const mcpTool: McpToolInfo = {
name: "test_tool",
description: "Test",
inputSchema: { type: "object" },
};
const caller = makeCaller({
content: [{ type: "text", text: "called" }],
isError: false,
});
const adapted = adaptTool("server", mcpTool, caller);
const result = await adapted.execute(
{ input: "value" },
{
toolCallId: "call-1",
onOutput: () => {},
signal: new AbortController().signal,
log: mockLogger,
},
);
expect(result.content).toBe("called");
expect(result.isError).toBe(false);
expect(caller.calls).toEqual([{ name: "test_tool", args: { input: "value" } }]);
});
it("execute propagates isError", async () => {
const caller = makeCaller({
content: [{ type: "text", text: "error occurred" }],
isError: true,
});
const mcpTool: McpToolInfo = {
name: "fail_tool",
description: "Fails",
inputSchema: { type: "object" },
};
const adapted = adaptTool("server", mcpTool, caller);
const result = await adapted.execute(
{},
{
toolCallId: "call-2",
onOutput: () => {},
signal: new AbortController().signal,
log: mockLogger,
},
);
expect(result.isError).toBe(true);
expect(result.content).toBe("error occurred");
});
it("handles inputSchema without optional fields", () => {
const mcpTool: McpToolInfo = {
name: "simple",
description: "Simple tool",
inputSchema: { type: "object" },
};
const caller = makeCaller({ content: [] });
const adapted = adaptTool("server", mcpTool, caller);
expect(adapted.parameters.type).toBe("object");
expect(adapted.parameters.properties).toBeUndefined();
expect(adapted.parameters.required).toBeUndefined();
expect(adapted.parameters.additionalProperties).toBeUndefined();
});
it("preserves additionalProperties", () => {
const mcpTool: McpToolInfo = {
name: "flex",
description: "Flexible",
inputSchema: {
type: "object",
additionalProperties: true,
},
};
const caller = makeCaller({ content: [] });
const adapted = adaptTool("server", mcpTool, caller);
expect(adapted.parameters.additionalProperties).toBe(true);
});
it("execute flattens multi-item content", async () => {
const caller = makeCaller({
content: [
{ type: "text", text: "summary" },
{ type: "image", data: "d", mimeType: "image/png" },
],
isError: false,
});
const mcpTool: McpToolInfo = {
name: "multi",
description: "Multi",
inputSchema: { type: "object" },
};
const adapted = adaptTool("srv", mcpTool, caller);
const result = await adapted.execute(
{},
{
toolCallId: "c",
onOutput: () => {},
signal: new AbortController().signal,
log: mockLogger,
},
);
expect(result.content).toBe("summary\n[image: image/png]");
});
});
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