diff --git a/packages/ai/src/ai/tools/annotations.ts b/packages/ai/src/ai/tools/annotations.ts
index 096f40461..b83985b0f 100644
--- a/packages/ai/src/ai/tools/annotations.ts
+++ b/packages/ai/src/ai/tools/annotations.ts
@@ -1,7 +1,12 @@
 import { tool } from "ai";
 import dayjs from "dayjs";
 import { z } from "zod";
-import { callRPCProcedure, createToolLogger, getAppContext } from "./utils";
+import {
+	callRPCProcedure,
+	createToolLogger,
+	getAppContext,
+	resolveToolWebsite,
+} from "./utils";
 
 const logger = createToolLogger("Annotations Tools");
 
@@ -95,10 +100,11 @@ export function createAnnotationTools() {
 		execute: async ({ websiteId, chartType, chartContext }, options) => {
 			const context = getAppContext(options);
 			try {
+				const resolved = resolveToolWebsite(context, websiteId);
 				const result = await callRPCProcedure(
 					"annotations",
 					"list",
-					{ websiteId, chartType, chartContext },
+					{ websiteId: resolved.websiteId, chartType, chartContext },
 					context
 				);
 				return {
@@ -107,7 +113,7 @@ export function createAnnotationTools() {
 				};
 			} catch (error) {
 				logger.error("Failed to list annotations", {
-					websiteId,
+					websiteId: websiteId,
 					chartType,
 					error,
 				});
@@ -140,6 +146,7 @@ export function createAnnotationTools() {
 			options
 		) => {
 			const context = getAppContext(options);
+			const resolved = resolveToolWebsite(context, websiteId);
 			try {
 				if (!confirmed) {
 					const dateRangePreview = `${chartContext.dateRange.start_date} to ${chartContext.dateRange.end_date} (${chartContext.dateRange.granularity})`;
@@ -149,7 +156,7 @@ export function createAnnotationTools() {
 						message:
 							"Please review the annotation details below and confirm if you want to create it:",
 						annotation: {
-							websiteId,
+							websiteId: resolved.websiteId,
 							chartType,
 							dateRange: dateRangePreview,
 							annotationType,
@@ -170,7 +177,7 @@ export function createAnnotationTools() {
 					"annotations",
 					"create",
 					{
-						websiteId,
+						websiteId: resolved.websiteId,
 						chartType,
 						chartContext,
 						annotationType,
diff --git a/packages/ai/src/ai/tools/utils/context.test.ts b/packages/ai/src/ai/tools/utils/context.test.ts
index 92096cdea..b0258acfe 100644
--- a/packages/ai/src/ai/tools/utils/context.test.ts
+++ b/packages/ai/src/ai/tools/utils/context.test.ts
@@ -86,4 +86,46 @@ describe("resolveToolWebsite", () => {
 
 		expect(() => resolveToolWebsite(ctx)).toThrow(/multiple websites/);
 	});
+
+	it("resolves a domain name matching ctx.websiteDomain to the context websiteId", () => {
+		// Insights agent passes domain names (e.g. "databuddy.cc") because LLM confuses
+		// domain with websiteId after seeing domain-keyed SQL queries.
+		const ctx = makeCtx({
+			websiteId: "internal-id-xyz",
+			websiteDomain: "databuddy.cc",
+		});
+
+		expect(resolveToolWebsite(ctx, "databuddy.cc")).toEqual({
+			websiteId: "internal-id-xyz",
+			domain: "databuddy.cc",
+		});
+	});
+
+	it("resolves a domain name matching an accessible website's domain", () => {
+		const ctx = makeCtx({
+			accessibleWebsites: [
+				{ id: "web_a", domain: "a.com", name: null, isPublic: null, createdAt: null },
+				{ id: "web_b", domain: "b.com", name: null, isPublic: null, createdAt: null },
+			],
+		});
+
+		expect(resolveToolWebsite(ctx, "b.com")).toEqual({
+			websiteId: "web_b",
+			domain: "b.com",
+		});
+	});
+
+	it("still rejects a domain that is not ctx.websiteDomain and not in accessible list", () => {
+		const ctx = makeCtx({
+			websiteId: "internal-id-xyz",
+			websiteDomain: "databuddy.cc",
+			accessibleWebsites: [
+				{ id: "web_a", domain: "a.com", name: null, isPublic: null, createdAt: null },
+			],
+		});
+
+		expect(() => resolveToolWebsite(ctx, "unknown.com")).toThrow(
+			/not in this workspace/
+		);
+	});
 });
diff --git a/packages/ai/src/ai/tools/utils/context.ts b/packages/ai/src/ai/tools/utils/context.ts
index 48b155ecb..767e1f271 100644
--- a/packages/ai/src/ai/tools/utils/context.ts
+++ b/packages/ai/src/ai/tools/utils/context.ts
@@ -27,15 +27,29 @@ export function resolveToolWebsite(
 		(id === ctx.websiteId ? ctx.websiteDomain : undefined);
 
 	if (inputWebsiteId) {
-		const isAccessible =
+		// Try exact ID match
+		const isAccessibleById =
 			accessible.some((w) => w.id === inputWebsiteId) ||
 			inputWebsiteId === ctx.websiteId;
-		if (!isAccessible) {
-			throw new Error(
-				`Website "${inputWebsiteId}" is not in this workspace. Call list_websites to see available websites.`
-			);
+		if (isAccessibleById) {
+			return { websiteId: inputWebsiteId, domain: domainFor(inputWebsiteId) };
 		}
-		return { websiteId: inputWebsiteId, domain: domainFor(inputWebsiteId) };
+
+		// Try domain name match (model may pass a domain instead of an ID)
+		const byDomain = accessible.find((w) => w.domain === inputWebsiteId);
+		if (byDomain) {
+			return { websiteId: byDomain.id, domain: byDomain.domain ?? undefined };
+		}
+		if (ctx.websiteDomain === inputWebsiteId) {
+			const fallbackId = ctx.defaultWebsiteId ?? ctx.websiteId;
+			if (fallbackId) {
+				return { websiteId: fallbackId, domain: ctx.websiteDomain };
+			}
+		}
+
+		throw new Error(
+			`Website "${inputWebsiteId}" is not in this workspace. Call list_websites to see available websites.`
+		);
 	}
 
 	const fallbackId = ctx.defaultWebsiteId ?? ctx.websiteId;