diff --git a/README.md b/README.md
index 31e8928..b20cbc4 100644
--- a/README.md
+++ b/README.md
@@ -102,13 +102,15 @@ curl -X POST 'http://localhost/api/whose-name/query/batch' \
           {"u":"other@example.org","s":"jira","q":"slack"},
           {"u":"unknown","s":"unknown","q":"unknown"}
         ]}'
-[{"username":"U123456"},{"username":"U234567"},{"username":null}]
+[{"u":"test@example.org","s":"jira","q":"slack","a":"U123456"},
+ {"u":"other@example.org","s":"jira","q":"slack","a":"U234567"},
+ {"u":"unknown","s":"unknown","q":"unknown","a":null}]
 ```
 
-The response is an array of `{"username": ...}` results in the **same order** as the
-queries. As with the single endpoint, each `username` is a string, an array of
-strings (when the asked service holds several names), or `null` when no match was
-found. The endpoint returns:
+The response is an array of results in the **same order** as the queries. Each
+result **echoes its query** (`u`, `s`, `q`) and carries the answer in `a` — a
+string, an array of strings (when the asked service holds several names), or `null`
+when no match was found. The endpoint returns:
 
 - `200 OK` when every query resolved to a username,
 - `207 Multi-Status` when at least one query returned `null`,
@@ -132,15 +134,17 @@ their own file (`pools.yml` by default):
 Both pool endpoints take `p` (the pool name) and `q` (the service you ask about).
 
 **Per-member** — `GET /api/whose-name/pool` resolves every member on the asked
-service and returns one `{"username": ...}` result per member, **in pool order**
-(same shape and status semantics as the batch query — a member may resolve to a
-string, an array of names, or `null`):
+service and returns one result per member, **in pool order**, in the same
+`{u, s, q, a}` shape and with the same status semantics as the batch query. For a
+pool, `u` is the member's name, `s` the pool's field, `q` the asked service, and
+`a` the answer (a string, an array of names, or `null`):
 
 ```
 curl 'http://localhost/api/whose-name/pool?p=Everyone&q=jira' \
     -H "Accept: application/json" \
     -H "Authorization: Bearer <YOURTOKEN>"
-[{"username":"jira1"},{"username":["jira2","jira3"]}]
+[{"u":"michal@makimo.pl","s":"email","q":"jira","a":"jira1"},
+ {"u":"alice@makimo.pl","s":"email","q":"jira","a":["jira2","jira3"]}]
 ```
 
 - `200 OK` when every member resolved,
diff --git a/docs/adl/2026-07-06-batch-query-status-and-shape.md b/docs/adl/2026-07-06-batch-query-status-and-shape.md
index 598eb28..20599fc 100644
--- a/docs/adl/2026-07-06-batch-query-status-and-shape.md
+++ b/docs/adl/2026-07-06-batch-query-status-and-shape.md
@@ -1,6 +1,11 @@
 # Batch query returns 200/207 with a lean, index-correlated result array
 
-**Status:** _accepted_.
+**Status:** _superseded_ by
+[2026-07-08-batch-query-echoes-input.md](2026-07-08-batch-query-echoes-input.md)
+for the **response shape** — each result now echoes its query and carries the
+answer under `a` instead of a lean `{"username": ...}`. The **status-code and
+validation** decisions below (`200`/`207`/`422`, strict `1..100` items) still
+hold.
 
 ## Context
 
diff --git a/docs/adl/2026-07-08-batch-query-echoes-input.md b/docs/adl/2026-07-08-batch-query-echoes-input.md
new file mode 100644
index 0000000..d3b1f05
--- /dev/null
+++ b/docs/adl/2026-07-08-batch-query-echoes-input.md
@@ -0,0 +1,67 @@
+# Batch query echoes each query and returns the answer under `a`
+
+**Status:** _accepted_. Supersedes the response-shape half of
+[2026-07-06-batch-query-status-and-shape.md](2026-07-06-batch-query-status-and-shape.md).
+
+## Context
+
+The batch endpoint `POST /api/whose-name/query/batch` returned a **lean array** of
+`{"username": ...}` objects, correlated to the input purely by order. The original
+ADL called this out as a deliberate, reversible trade: _"an input echo or
+client-supplied ids can be added without changing the status semantics"_.
+
+Order-only correlation is fragile for clients: a result carries no record of which
+query produced it, so any reordering, filtering, or logging of individual results
+loses that link, and a single result is not self-describing.
+
+## Decision
+
+Each result item **echoes its query and carries the answer**:
+
+```json
+{"u": "test@example.org", "s": "jira", "q": "slack", "a": "U123456"}
+```
+
+- `u`, `s`, `q` are the query's fields, verbatim.
+- `a` is the answer — a string, an array of strings (when the asked service holds
+  several names), or `null` when no match was found. It replaces the old
+  `username` key.
+- The response stays an array in the **same order** as the queries.
+
+Everything else is unchanged from the superseded ADL: `200` when every query
+resolved, `207` when at least one `a` is `null`, `422` on a malformed body
+(strict `1..100` items, each with non-empty `u`, `s`, `q`). Iteration still lives
+in `QueryService::whatAreTheNamesOf`; the route closure zips the validated queries
+with their answers.
+
+The single endpoint `GET /query` is untouched — it still returns
+`{"username": ...}`.
+
+## Consequences
+
+- Each result is **self-describing**: clients can correlate by content, not just
+  position, and safely reorder, filter, or log individual items.
+- The payload is heavier (four keys per item, echoing input the client already
+  sent). Acceptable for a bounded batch (`max:100`).
+- **Breaking change** for clients: the per-item key changed from `username` to
+  `a`, and the shape gained `u`/`s`/`q`. Consumers of the batch endpoint must
+  migrate. The single endpoint's `{"username": ...}` is intentionally left as-is,
+  so the two endpoints now differ in their result key.
+- The pool per-member endpoint (`GET /pool`) adopts the **same** echoed shape,
+  mapping each member to a query: `u` = member name, `s` = the pool's field,
+  `q` = the asked service, `a` = the answer. The route reads the pool (for its
+  members and field) and zips it with the answers from
+  `PoolService::whatAreTheNamesOf`, which is left returning a plain list so
+  `whoseNamesAreThere` and the flattened `/pool/names` endpoint are unaffected.
+
+## Alternatives
+
+- **Keep the lean array, add a client-supplied `id`** — order-independent with a
+  smaller payload, but pushes correlation bookkeeping onto the client and needs a
+  new input field; rejected in favour of echoing the query the client already has.
+- **Echo input but keep `username` for the answer** — rejected: `a` is short and
+  neutral, and renaming makes the shape change unmistakable at the call site.
+
+## Decision date
+
+> 2026-07-08
diff --git a/routes/api.php b/routes/api.php
index 586861e..c3f1f5e 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -6,6 +6,7 @@
 
 use Domain\WhoseName\QueryService;
 use Domain\WhoseName\PoolService;
+use Domain\WhoseName\PoolQueryRepository;
 
 /*
 |--------------------------------------------------------------------------
@@ -88,32 +89,45 @@
                 'queries.*.q' => 'required|string',
             ]);
 
-            $usernames = $service->whatAreTheNamesOf(array_map(fn ($query) => [
+            $answers = $service->whatAreTheNamesOf(array_map(fn ($query) => [
                 'username'     => $query['u'],
                 'service'      => $query['s'],
                 'askedService' => $query['q'],
             ], $validated['queries']));
 
-            $results = array_map(fn ($username) => ['username' => $username], $usernames);
+            $results = array_map(fn ($query, $answer) => [
+                'u' => $query['u'],
+                's' => $query['s'],
+                'q' => $query['q'],
+                'a' => $answer,
+            ], $validated['queries'], $answers);
 
-            $allResolved = !in_array(null, $usernames, true);
+            $allResolved = !in_array(null, $answers, true);
 
             return response()->json($results, $allResolved ? 200 : 207);
         });
 
-        Route::get('/pool', function (Request $request, PoolService $service) {
-            $responses = $service->whatAreTheNamesOf(
-                $request->input('p', ''),
-                $request->input('q', '')
-            );
+        Route::get('/pool', function (Request $request, PoolService $service, PoolQueryRepository $pools) {
+            $poolName = $request->input('p', '');
+            $askedService = $request->input('q', '');
+
+            $pool = $pools->findByName($poolName);
+            $answers = $service->whatAreTheNamesOf($poolName, $askedService);
 
-            $results = array_map(fn ($username) => ['username' => $username], $responses);
+            // Echo each member as a query (u = member, s = pool field,
+            // q = asked service) alongside its answer, like the batch endpoint.
+            $results = array_map(fn ($member, $answer) => [
+                'u' => $member,
+                's' => $pool->getField(),
+                'q' => $askedService,
+                'a' => $answer,
+            ], $pool->getNames(), $answers);
 
             if (empty($results)) {
                 return response()->json($results, 404);
             }
 
-            $allResolved = !in_array(null, $responses, true);
+            $allResolved = !in_array(null, $answers, true);
 
             return response()->json($results, $allResolved ? 200 : 207);
         });
diff --git a/tests/Application/A1_WhoseNameAPI/QueryWhoseNameBatchEndpoint.php b/tests/Application/A1_WhoseNameAPI/QueryWhoseNameBatchEndpoint.php
index f6d07be..5a91f84 100644
--- a/tests/Application/A1_WhoseNameAPI/QueryWhoseNameBatchEndpoint.php
+++ b/tests/Application/A1_WhoseNameAPI/QueryWhoseNameBatchEndpoint.php
@@ -9,7 +9,7 @@
 uses(RefreshDatabase::class);
 
 
-gest('usage', 'Batch querying returns 200 with a username per query, in order, when all resolve', function () {
+gest('usage', 'Batch querying echoes each query and returns 200 with its answer, in order, when all resolve', function () {
     Sanctum::actingAs(
         User::factory()->create(),
         ['whose-name']
@@ -24,8 +24,8 @@
 
     $response->assertStatus(200);
     $response->assertExactJson([
-        ['username' => 'U123456'],
-        ['username' => 'other@example.org'],
+        ['u' => 'test@example.org', 's' => 'jira',  'q' => 'slack', 'a' => 'U123456'],
+        ['u' => 'U234567',          's' => 'slack', 'q' => 'jira',  'a' => 'other@example.org'],
     ]);
 });
 
@@ -45,8 +45,8 @@
 
     $response->assertStatus(200);
     $response->assertExactJson([
-        ['username' => ['other@example.org', 'new@example.org']],
-        ['username' => 'U234567'],
+        ['u' => 'U234567',        's' => 'slack', 'q' => 'email', 'a' => ['other@example.org', 'new@example.org']],
+        ['u' => 'new@example.org', 's' => 'email', 'q' => 'slack', 'a' => 'U234567'],
     ]);
 });
 
@@ -66,8 +66,8 @@
 
     $response->assertStatus(207);
     $response->assertExactJson([
-        ['username' => 'U123456'],
-        ['username' => null],
+        ['u' => 'test@example.org', 's' => 'jira',    'q' => 'slack',   'a' => 'U123456'],
+        ['u' => 'unknown',          's' => 'unknown', 'q' => 'unknown', 'a' => null],
     ]);
 });
 
diff --git a/tests/Application/A1_WhoseNameAPI/QueryWhoseNamePoolEndpoint.php b/tests/Application/A1_WhoseNameAPI/QueryWhoseNamePoolEndpoint.php
index d53dae3..c64d688 100644
--- a/tests/Application/A1_WhoseNameAPI/QueryWhoseNamePoolEndpoint.php
+++ b/tests/Application/A1_WhoseNameAPI/QueryWhoseNamePoolEndpoint.php
@@ -21,8 +21,8 @@
 
     $response->assertStatus(200);
     $response->assertExactJson([
-        ['username' => 'single@example.org'],
-        ['username' => ['other@example.org', 'new@example.org']],
+        ['u' => 'U123456', 's' => 'slack', 'q' => 'email', 'a' => 'single@example.org'],
+        ['u' => 'U234567', 's' => 'slack', 'q' => 'email', 'a' => ['other@example.org', 'new@example.org']],
     ]);
 });
 
@@ -34,8 +34,8 @@
 
     $response->assertStatus(200);
     $response->assertExactJson([
-        ['username' => 'U123456'],
-        ['username' => 'U234567'],
+        ['u' => 'U123456', 's' => 'slack', 'q' => 'slack', 'a' => 'U123456'],
+        ['u' => 'U234567', 's' => 'slack', 'q' => 'slack', 'a' => 'U234567'],
     ]);
 });
 
@@ -50,8 +50,8 @@
 
     $response->assertStatus(207);
     $response->assertExactJson([
-        ['username' => 'test@example.org'],
-        ['username' => null],
+        ['u' => 'single@example.org', 's' => 'email', 'q' => 'jira', 'a' => 'test@example.org'],
+        ['u' => 'ghost@example.org',  's' => 'email', 'q' => 'jira', 'a' => null],
     ]);
 });