From eaf0986c492c4e28de8edf40e44f6d54587f9882 Mon Sep 17 00:00:00 2001
From: Jonathan Norris <jonathan.norris@dynatrace.com>
Date: Thu, 8 Oct 2026 16:20:20 -0400
Subject: [PATCH 1/2] fix(mcp-worker): set explicit fetch cache mode for axios
 1.20

---
 mcp-worker/src/axiosFetchDefaults.ts | 13 +++++++++++++
 mcp-worker/src/index.ts              |  1 +
 2 files changed, 14 insertions(+)
 create mode 100644 mcp-worker/src/axiosFetchDefaults.ts

diff --git a/mcp-worker/src/axiosFetchDefaults.ts b/mcp-worker/src/axiosFetchDefaults.ts
new file mode 100644
index 00000000..5ef9b9c5
--- /dev/null
+++ b/mcp-worker/src/axiosFetchDefaults.ts
@@ -0,0 +1,13 @@
+import axios from 'axios'
+import { axiosClient } from '../../src/api/apiClient'
+
+/**
+ * axios >= 1.20 defaults fetch requests to `cache: 'default'`, which the
+ * Workers runtime rejects ("Unsupported cache mode: default"). Workers only
+ * accept `no-store` / `no-cache`, so set an explicit value on both the global
+ * axios defaults and the shared CLI client instance.
+ */
+const fetchOptions = { cache: 'no-store' as const }
+
+axios.defaults.fetchOptions = fetchOptions
+axiosClient.defaults.fetchOptions = fetchOptions
diff --git a/mcp-worker/src/index.ts b/mcp-worker/src/index.ts
index 736d5522..e8e12a2a 100644
--- a/mcp-worker/src/index.ts
+++ b/mcp-worker/src/index.ts
@@ -1,3 +1,4 @@
+import './axiosFetchDefaults'
 import OAuthProvider from '@cloudflare/workers-oauth-provider'
 import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'
 import type { ToolAnnotations } from '@modelcontextprotocol/sdk/types.js'

From 03942e2c52beda1e3c14be9d1e32d49faeff24c6 Mon Sep 17 00:00:00 2001
From: Jonathan Norris <jonathan.norris@dynatrace.com>
Date: Thu, 8 Oct 2026 16:24:36 -0400
Subject: [PATCH 2/2] test(mcp-worker): cover axios fetch cache defaults

---
 mcp-worker/src/axiosFetchDefaults.test.ts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 mcp-worker/src/axiosFetchDefaults.test.ts

diff --git a/mcp-worker/src/axiosFetchDefaults.test.ts b/mcp-worker/src/axiosFetchDefaults.test.ts
new file mode 100644
index 00000000..6c2048de
--- /dev/null
+++ b/mcp-worker/src/axiosFetchDefaults.test.ts
@@ -0,0 +1,14 @@
+import { describe, expect, test } from 'vitest'
+import axios from 'axios'
+import { axiosClient } from '../../src/api/apiClient'
+import './axiosFetchDefaults'
+
+describe('axiosFetchDefaults', () => {
+    test('sets a Workers-compatible cache mode on global axios defaults', () => {
+        expect(axios.defaults.fetchOptions?.cache).toBe('no-store')
+    })
+
+    test('sets a Workers-compatible cache mode on the shared axiosClient', () => {
+        expect(axiosClient.defaults.fetchOptions?.cache).toBe('no-store')
+    })
+})