feat(tool-web-search): Firecrawl-backed web search tool

New standard tool extension with one tool web_search supporting 4 modes
(search, scrape, crawl, map) against a self-hosted Firecrawl instance.

Pure core: validateArgs (discriminated union by mode) + format* functions
+ truncateOutput. Injected edge: FirecrawlClient (injectable fetchFn/sleep/now,
AbortSignal.any for per-request timeout + caller cancellation). concurrencySafe
true, capabilities network. 38 tests, zero vi.mock.

Live-verified: umans-glm-5.2 called web_search → real Firecrawl results (also
the first live Umans API call).

1 files changed, 87 insertions, 0 deletions

diff --git a/packages/tool-web-search/src/format.test.ts b/packages/tool-web-search/src/format.test.ts
new file mode 100644
index 0000000..b98bc02
--- /dev/null
+++ b/packages/tool-web-search/src/format.test.ts
@@ -0,0 +1,87 @@
+import { describe, expect, it } from "vitest";
+import {
+	formatCrawlResults,
+	formatMapResults,
+	formatScrapeResult,
+	formatSearchResults,
+	truncateOutput,
+} from "./format.js";
+
+describe("formatSearchResults", () => {
+	it("formats title + url + description + optional markdown", () => {
+		const out = formatSearchResults([
+			{ title: "T1", url: "http://a", description: "desc", markdown: "md-body" },
+		]);
+		expect(out).toBe("### T1\nhttp://a\n\ndesc\n\nmd-body");
+	});
+
+	it("joins multiple results with ---", () => {
+		const out = formatSearchResults([
+			{ title: "T1", url: "http://a", description: "d1" },
+			{ title: "T2", url: "http://b", description: "d2" },
+		]);
+		expect(out).toBe("### T1\nhttp://a\n\nd1\n\n---\n\n### T2\nhttp://b\n\nd2");
+	});
+
+	it("empty data returns 'No results found.'", () => {
+		expect(formatSearchResults([])).toBe("No results found.");
+		expect(formatSearchResults(null)).toBe("No results found.");
+		expect(formatSearchResults(undefined)).toBe("No results found.");
+	});
+});
+
+describe("formatScrapeResult", () => {
+	it("formats title + markdown", () => {
+		const out = formatScrapeResult({
+			data: { markdown: "body", metadata: { title: "Title" } },
+		});
+		expect(out).toBe("# Title\n\nbody");
+	});
+
+	it("omits title header when absent", () => {
+		const out = formatScrapeResult({ data: { markdown: "body" } });
+		expect(out).toBe("body");
+	});
+});
+
+describe("formatCrawlResults", () => {
+	it("formats multiple pages", () => {
+		const out = formatCrawlResults([
+			{ markdown: "p1", metadata: { title: "P1", sourceURL: "http://p1" } },
+			{ markdown: "p2", metadata: { title: "P2", url: "http://p2" } },
+		]);
+		expect(out).toBe("## P1\nhttp://p1\n\np1\n\n---\n\n## P2\nhttp://p2\n\np2");
+	});
+
+	it("empty data returns 'No pages crawled.'", () => {
+		expect(formatCrawlResults([])).toBe("No pages crawled.");
+		expect(formatCrawlResults(null)).toBe("No pages crawled.");
+	});
+});
+
+describe("formatMapResults", () => {
+	it("formats links as bullet list", () => {
+		const out = formatMapResults(["http://a", "http://b"]);
+		expect(out).toBe("- http://a\n- http://b");
+	});
+
+	it("empty links returns 'No links found.'", () => {
+		expect(formatMapResults([])).toBe("No links found.");
+		expect(formatMapResults(null)).toBe("No links found.");
+	});
+});
+
+describe("truncateOutput", () => {
+	it("truncates with notice when over cap", () => {
+		const output = "a".repeat(100);
+		const result = truncateOutput(output, 50);
+		expect(result).toContain("a".repeat(50));
+		expect(result).toContain("[Output truncated: exceeded 50 characters]");
+		expect(result.length).toBeLessThan(output.length + 100);
+	});
+
+	it("returns as-is when under cap", () => {
+		expect(truncateOutput("short", 100)).toBe("short");
+		expect(truncateOutput("exact", 5)).toBe("exact");
+	});
+});