diff --git a/packages/api/src/routes/mcp/tools.ts b/packages/api/src/routes/mcp/tools.ts
index e2a99dae..6aca10e2 100644
--- a/packages/api/src/routes/mcp/tools.ts
+++ b/packages/api/src/routes/mcp/tools.ts
@@ -252,13 +252,18 @@ export const TOOLS: ToolDefinition[] = [
     zodSchema: storeConversationSchema,
     inputSchema: jsonSchema(storeConversationSchema),
     handler: async (c, args: z.infer<typeof storeConversationSchema>) => {
-      const result = await conversationsService.createConversation(c.get("db"), {
-        projectId: c.get("projectId"),
-        externalId: args.external_id ?? null,
-        title: args.title ?? null,
-        metadata: args.metadata ?? null,
-        inputMessages: args.messages,
-      });
+      const result = await conversationsService.createConversation(
+        c.get("db"),
+        {
+          projectId: c.get("projectId"),
+          externalId: args.external_id ?? null,
+          title: args.title ?? null,
+          metadata: args.metadata ?? null,
+          inputMessages: args.messages,
+        },
+        c.executionCtx,
+        c.env.AUTH_CACHE,
+      );
       if (result.error) throw new ToolError(result.error.code, result.error.message);
       return {
         id: result.conversationId,
diff --git a/packages/api/src/services/mcp-conversations.ts b/packages/api/src/services/mcp-conversations.ts
index 320156e2..67a9d9b7 100644
--- a/packages/api/src/services/mcp-conversations.ts
+++ b/packages/api/src/services/mcp-conversations.ts
@@ -10,7 +10,10 @@
 
 import { and, asc, desc, eq, gt, lt, sql } from "drizzle-orm";
 import type { DrizzleD1Database } from "drizzle-orm/d1";
+// Hono's type, not the workers-types v5 global — see services/conversations.ts.
+import type { ExecutionContext } from "hono";
 import { conversations, conversationTags, messages } from "../db/schema";
+import { invalidateAnalyticsCache } from "../lib/analytics-cache";
 import { CACHE_COUNT_TTL_S } from "../lib/config";
 import { generateId } from "../lib/id";
 import { serializeMetadata } from "../lib/serialization";
@@ -118,6 +121,8 @@ export function validateCursor(
 export async function createConversation(
   db: DrizzleD1Database,
   input: CreateConversationInput,
+  executionCtx: ExecutionContext,
+  cache?: KVNamespace,
 ): Promise<CreateConversationResult> {
   const { projectId, externalId, title, metadata, inputMessages } = input;
   const now = Date.now();
@@ -188,6 +193,8 @@ export async function createConversation(
     await db.insert(messages).values(rows);
   }
 
+  invalidateAnalyticsCache(cache, executionCtx, projectId);
+
   return {
     conversationId,
     projectId,
@@ -340,6 +347,9 @@ export async function updateConversation(
 export async function deleteConversation(
   db: DrizzleD1Database,
   conversationId: string,
+  projectId: string,
+  executionCtx: ExecutionContext,
+  cache?: KVNamespace,
 ): Promise<void> {
   // Batch delete: tags → messages → conversation (order respects FK constraints)
   await db.batch([
@@ -347,4 +357,6 @@ export async function deleteConversation(
     db.delete(messages).where(eq(messages.conversationId, conversationId)),
     db.delete(conversations).where(eq(conversations.id, conversationId)),
   ]);
+
+  invalidateAnalyticsCache(cache, executionCtx, projectId);
 }
diff --git a/packages/api/test/analytics.test.ts b/packages/api/test/analytics.test.ts
index 9825a7cd..70c5b27b 100644
--- a/packages/api/test/analytics.test.ts
+++ b/packages/api/test/analytics.test.ts
@@ -161,6 +161,56 @@ describe("Analytics", () => {
       expect(recentIds).toContain(created.id);
     });
 
+    it("counts match after MCP store_conversation, with no stale cache (issue #372)", async () => {
+      const baselineRes = await fetchAnalytics();
+      const baseline = await baselineRes.json<AnalyticsResponse>();
+      const baseConvs = baseline.summary.total_conversations;
+      const baseMsgs = baseline.summary.total_messages;
+      const baseTokens = baseline.summary.total_tokens;
+      const mcpMessages = [
+        { role: "user", content: "Hello", token_count: 4 },
+        { role: "assistant", content: "Hi", token_count: 6 },
+      ];
+
+      const store = await SELF.fetch("http://localhost/api/mcp", {
+        method: "POST",
+        headers: {
+          ...authHeaders(),
+          Accept: "application/json, text/event-stream",
+        },
+        body: JSON.stringify({
+          jsonrpc: "2.0",
+          id: 1,
+          method: "tools/call",
+          params: {
+            name: "store_conversation",
+            arguments: {
+              title: "MCP Analytics Cache Test",
+              messages: mcpMessages,
+            },
+          },
+        }),
+      });
+      expect(store.status).toBe(200);
+      const storeJson = (await store.json()) as {
+        result?: { isError?: boolean; content: Array<{ text: string }> };
+      };
+      expect(storeJson.result?.isError).toBeUndefined();
+      const created = JSON.parse(storeJson.result?.content[0].text ?? "{}") as { id?: string };
+      expect(created.id).toBeTruthy();
+
+      const afterRes = await fetchAnalytics();
+      const after = await afterRes.json<AnalyticsResponse>();
+
+      expect(after.summary.total_conversations).toBe(baseConvs + 1);
+      expect(after.summary.total_messages).toBe(baseMsgs + mcpMessages.length);
+      const expectedTokenDelta = mcpMessages.reduce(
+        (sum, message) => sum + (message.token_count ?? 0),
+        0,
+      );
+      expect(after.summary.total_tokens).toBe(baseTokens + expectedTokenDelta);
+    });
+
     it("reflects deleted conversations immediately, with no stale cache (issue #352)", async () => {
       const createRes = await createConversation({
         title: "To Be Deleted",