diff --git a/__tests__/adapter/MdSourceClient.test.ts b/__tests__/adapter/MdSourceClient.test.ts
index f87a87b..73f9733 100644
--- a/__tests__/adapter/MdSourceClient.test.ts
+++ b/__tests__/adapter/MdSourceClient.test.ts
@@ -37,6 +37,12 @@ describe('MdSourceClient', () => {
     expect(String(vi.mocked(fetch).mock.calls[0]?.[0])).toContain(
       `/incentives/${ca1Fixture.slug}/`,
     );
+    expect(vi.mocked(fetch).mock.calls[0]?.[1]).toMatchObject({
+      headers: {
+        accept: 'application/json',
+        'user-agent': 'cg-api-md/0.1 (+https://github.com/agilesix/cg-api-md)',
+      },
+    });
   });
 
   it('normalizes nullable Compass metadata', async () => {
diff --git a/src/adapter/MdSourceClient.ts b/src/adapter/MdSourceClient.ts
index 1357d6a..bd8f422 100644
--- a/src/adapter/MdSourceClient.ts
+++ b/src/adapter/MdSourceClient.ts
@@ -23,6 +23,10 @@ const DETAIL_CONCURRENCY = 5;
 const MAX_ATTEMPTS = 4;
 const REQUEST_TIMEOUT_MS = 10_000;
 const RETRYABLE_STATUSES = new Set([429, 500, 502, 503, 504]);
+const REQUEST_HEADERS = {
+  accept: 'application/json',
+  'user-agent': 'cg-api-md/0.1 (+https://github.com/agilesix/cg-api-md)',
+} as const;
 
 /** Read-only client for Maryland Community Compass's incentives REST API. */
 export class MdSourceClient implements ISourceClient<MdGrant> {
@@ -105,7 +109,7 @@ export class MdSourceClient implements ISourceClient<MdGrant> {
       const timeout = setTimeout(() => controller.abort(), REQUEST_TIMEOUT_MS);
       try {
         const response = await fetch(url, {
-          headers: { accept: 'application/json' },
+          headers: REQUEST_HEADERS,
           signal: controller.signal,
         });
         if (!RETRYABLE_STATUSES.has(response.status) || attempt === MAX_ATTEMPTS) {