{"messages":[{"content":"You are a constitutional council ranking individual git commits for ownership allocation.\n\nCompare these two commits. Decide which contributed more lasting value to the project.\n\nJudge substance, not spectacle:\n- Prefer correct, lasting design and real bugfixes over churn, formatting, renames, or generated noise.\n- Prefer clarity and necessity over sheer line count. A small precise change can beat a large diffuse one.\n- Do not favor a side merely because its patch is longer or noisier.\n- Weight what the change does for the project, not the contributor's name.\n\nReturn ONLY a JSON object: {\"winner\": \"A\" or \"B\", \"ratio\": \"N:M\", \"explanation\": \"...\"}\nThe explanation must cite concrete differences in the patches (1-3 sentences).\n\nSide A — contributor: tommy-mor\nSide A — commit message:\n[8f69c309] Require Reddit OAuth when credentials are set and refresh on 401/403.\n\nAvoid falling back to the public www.reddit.com API from cloud IPs, which\nreturns Reddit's network-security block page. Also pin SORTER2_BASE_URL in fly.toml.\n\nCo-authored-by: Cursor <cursoragent@cursor.com>\n\nSide A — unified diff (full patch):\ndiff --git a/fly.toml b/fly.toml\nindex f0c6a39f643c204987debc177234d95a8ef44b65..ca7e0088a7efd7d58d29d808f8d89080b2bff233 100644\n--- a/fly.toml\n+++ b/fly.toml\n@@ -5,6 +5,7 @@ primary_region = \"iad\"\n   dockerfile = \"Dockerfile\"\n \n [env]\n+  SORTER2_BASE_URL = \"https://reddit.sorter.social\"\n   SORTER2_DATA_DIR = \"/data\"\n   SORTER2_EVENT_LOG = \"/data/events.jsonl\"\n   PORT = \"8080\"\ndiff --git a/server/src/reddit.rs b/server/src/reddit.rs\nindex a874814f8927192ee62cab2d0db1efd27dcd57b7..f409764c1e1f36216f1b08107043c2eab905694c 100644\n--- a/server/src/reddit.rs\n+++ b/server/src/reddit.rs\n@@ -283,26 +283,35 @@ async fn reddit_worker(\n         );\n         tokio::time::sleep(current_delay).await;\n \n-        if let Some(c) = &creds {\n-            oauth = ensure_oauth_token(&client, &oauth_token_base, c, oauth.take()).await;\n-        }\n-\n-        let token = oauth.as_ref().map(|t| t.access_token.as_str());\n-        let fetch_base = if token.is_some() {\n-            tracing::debug!(\n-                item = %fetch_id,\n-                base = %oauth_api_base,\n-                \"reddit fetch using OAuth bearer\"\n-            );\n-            &oauth_api_base\n-        } else {\n-            &api_base\n-        };\n-        let url = match kind {\n-            FetchKind::SelfEntity => map_item_to_reddit_api(&fetch_id, fetch_base),\n-            FetchKind::Children => map_children_url(&fetch_id, fetch_base),\n+        let outcome = match &creds {\n+            Some(c) => {\n+                // OAuth is required when credentials are configured — never fall\n+                // back to the public www.reddit.com JSON endpoints (cloud IPs\n+                // get blocked with a 403 HTML interstitial).\n+                fetch_with_oauth(\n+                    &client,\n+                    &oauth_token_base,\n+                    &oauth_api_base,\n+                    c,\n+                    &mut oauth,\n+                    &fetch_id,\n+                    kind,\n+                )\n+                .await\n+            }\n+            None => {\n+                let url = match kind {\n+                    FetchKind::SelfEntity => map_item_to_reddit_api(&fetch_id, &api_base),\n+                    FetchKind::Children => map_children_url(&fetch_id, &api_base),\n+                };\n+                match do_fetch(&client, &url, &fetch_id, None).await {\n+                    Ok(FetchOutcome::AuthRejected { status, detail }) => {\n+                        Err(format!(\"Reddit API {status}: {detail}\"))\n+                    }\n+                    other => other,\n+                }\n+            }\n         };\n-        let outcome = do_fetch(&client, &url, &fetch_id, token).await;\n \n         match outcome {\n             Ok(FetchOutcome::Payload(payload)) => {\n@@ -342,6 +351,12 @@ async fn reddit_worker(\n                 current_delay = (current_delay * 2).min(Duration::from_secs(60));\n                 notify(done, FetchJobResult::RateLimited { reset_secs });\n             }\n+            Ok(FetchOutcome::AuthRejected { status, detail }) => {\n+                let e = format!(\"Reddit API {status}: {detail}\");\n+                tracing::warn!(item = %fetch_id, err = %e, \"reddit fetch auth rejected\");\n+                current_delay = (current_delay * 2).min(Duration::from_secs(60));\n+                notify(done, FetchJobResult::Failed(e));\n+            }\n             Err(e) => {\n                 tracing::warn!(item = %fetch_id, err = %e, \"reddit fetch failed\");\n                 current_delay = (current_delay * 2).min(Duration::from_secs(60));\n@@ -357,6 +372,60 @@ enum FetchOutcome {\n     Payload(Value),\n     NotFound,\n     RateLimited { reset_secs: u64 },\n+    /// Bearer rejected — caller should drop the cached token and retry once.\n+    AuthRejected { status: StatusCode, detail: String },\n+}\n+\n+async fn fetch_with_oauth(\n+    client: &Client,\n+    oauth_token_base: &str,\n+    oauth_api_base: &str,\n+    creds: &RedditCredentials,\n+    oauth: &mut Option<OAuthToken>,\n+    fetch_id: &ItemId,\n+    kind: FetchKind,\n+) -> Result<FetchOutcome, String> {\n+    for attempt in 0..2 {\n+        let force_refresh = attempt > 0;\n+        *oauth = Some(\n+            ensure_oauth_token(client, oauth_token_base, creds, oauth.take(), force_refresh)\n+                .await?,\n+        );\n+        let token = oauth\n+            .as_ref()\n+            .expect(\"token set above\")\n+            .access_token\n+            .clone();\n+\n+        tracing::debug!(\n+            item = %fetch_id,\n+            base = %oauth_api_base,\n+            attempt,\n+            \"reddit fetch using OAuth bearer\"\n+        );\n+\n+        let url = match kind {\n+            FetchKind::SelfEntity => map_item_to_reddit_api(fetch_id, oauth_api_base),\n+            FetchKind::Children => map_children_url(fetch_id, oauth_api_base),\n+        };\n+        match do_fetch(client, &url, fetch_id, Some(&token)).await? {\n+            FetchOutcome::AuthRejected { status, detail } if attempt == 0 => {\n+                tracing::warn!(\n+                    item = %fetch_id,\n+                    %status,\n+                    %detail,\n+                    \"reddit OAuth rejected; refreshing token and retrying\"\n+                );\n+                *oauth = None;\n+                continue;\n+            }\n+            FetchOutcome::AuthRejected { status, detail } => {\n+                return Err(format!(\"Reddit API {status}: {detail}\"));\n+            }\n+            other => return Ok(other),\n+        }\n+    }\n+    unreachable!(\"loop always returns\")\n }\n \n async fn ensure_oauth_token(\n@@ -364,35 +433,35 @@ async fn ensure_oauth_token(\n     oauth_base: &str,\n     creds: &RedditCredentials,\n     existing: Option<OAuthToken>,\n-) -> Option<OAuthToken> {\n-    if let Some(t) = existing {\n-        if Instant::now() < t.expires_at - Duration::from_secs(60) {\n-            tracing::debug!(\"reddit OAuth token still valid\");\n-            return Some(t);\n+    force_refresh: bool,\n+) -> Result<OAuthToken, String> {\n+    if !force_refresh {\n+        if let Some(t) = existing {\n+            if Instant::now() < t.expires_at - Duration::from_secs(60) {\n+                tracing::debug!(\"reddit OAuth token still valid\");\n+                return Ok(t);\n+            }\n         }\n     }\n \n     let url = format!(\"{}/api/v1/access_token\", oauth_base.trim_end_matches('/'));\n-    tracing::debug!(%url, \"reddit OAuth token request\");\n+    tracing::debug!(%url, force_refresh, \"reddit OAuth token request\");\n \n     let resp = client\n         .post(&url)\n         .basic_auth(&creds.client_id, Some(&creds.client_secret))\n         .form(&[(\"grant_type\", \"client_credentials\")])\n         .send()\n-        .await;\n-\n-    let resp = match resp {\n-        Ok(r) => r,\n-        Err(e) => {\n-            tracing::warn!(\"reddit OAuth token request failed: {e}\");\n-            return None;\n-        }\n-    };\n+        .await\n+        .map_err(|e| format!(\"Reddit OAuth token request failed: {e}\"))?;\n \n     if !resp.status().is_success() {\n-        tracing::warn!(\"reddit OAuth token HTTP {}\", resp.status());\n-        return None;\n+        let status = resp.status();\n+        let body = resp.text().await.unwrap_or_default();\n+        return Err(format!(\n+            \"Reddit OAuth token HTTP {status}: {}\",\n+            truncate_for_error(&body)\n+        ));\n     }\n \n     #[derive(Deserialize)]\n@@ -401,21 +470,40 @@ async fn ensure_oauth_token(\n         expires_in: u64,\n     }\n \n-    let body: TokenResponse = match resp.json().await {\n-        Ok(b) => b,\n-        Err(e) => {\n-            tracing::warn!(\"reddit OAuth token parse failed: {e}\");\n-            return None;\n-        }\n-    };\n+    let body: TokenResponse = resp\n+        .json()\n+        .await\n+        .map_err(|e| format!(\"Reddit OAuth token parse failed: {e}\"))?;\n \n-    tracing::debug!(expires_in = body.expires_in, \"reddit OAuth token acquired\");\n-    Some(OAuthToken {\n+    tracing::info!(expires_in = body.expires_in, \"reddit OAuth token acquired\");\n+    Ok(OAuthToken {\n         access_token: body.access_token,\n         expires_at: Instant::now() + Duration::from_secs(body.expires_in),\n     })\n }\n \n+fn truncate_for_error(body: &str) -> String {\n+    let compact: String = body.split_whitespace().collect::<Vec<_>>().join(\" \");\n+    if compact.is_empty() {\n+        return \"(empty body)\".into();\n+    }\n+    // Prefer the human-readable block message over dumping Reddit's CSS.\n+    if let Some(idx) = compact.find(\"You've been blocked\") {\n+        let slice: String = compact.chars().skip(idx).take(160).collect();\n+        return if compact.chars().count() > idx + 160 {\n+            format!(\"{slice}…\")\n+        } else {\n+            slice\n+        };\n+    }\n+    let chars: String = compact.chars().take(200).collect();\n+    if compact.chars().count() > 200 {\n+        format!(\"{chars}…\")\n+    } else {\n+        chars\n+    }\n+}\n+\n async fn do_fetch(\n     client: &Client,\n     url: &str,\n@@ -460,15 +548,16 @@ async fn do_fetch(\n \n     if !status.is_success() {\n         let body = resp.text().await.unwrap_or_default();\n+        let detail = truncate_for_error(&body);\n         tracing::debug!(\n             item = %id,\n             %status,\n             body_len = body.len(),\n-            body_prefix = %body.chars().take(240).collect::<String>(),\n+            %detail,\n             \"reddit non-success body\"\n         );\n         if status == StatusCode::FORBIDDEN || status == StatusCode::UNAUTHORIZED {\n-            return Err(format!(\"Reddit API {status}: {body}\"));\n+            return Ok(FetchOutcome::AuthRejected { status, detail });\n         }\n         return Ok(FetchOutcome::NotFound);\n     }\n@@ -716,6 +805,15 @@ fn reddit_direct_image_url(url: &str) -> bool {\n mod tests {\n     use super::*;\n \n+    #[test]\n+    fn truncate_error_prefers_block_message() {\n+        let html = r#\"<style>.x{color:red}</style><div>You've been blocked by network security. To continue, log in</div>\"#;\n+        let msg = truncate_for_error(html);\n+        assert!(msg.starts_with(\"You've been blocked\"));\n+        assert!(msg.len() < 200);\n+        assert!(!msg.contains(\".x{color\"));\n+    }\n+\n     #[test]\n     fn map_subreddit_about_url() {\n         let id = ItemId::from_url(\"https://reddit.com/r/rust\").unwrap();\n\n\nSide B — contributor: tommy-mor\nSide B — commit message:\n[5350388a] Add pool-scoped voting: /vote?pool=<parent> picks pairs from children.\n\n- /vote now accepts an optional `pool` param (parent item path). When\n  provided without left/right, it picks the first unvoted pair from the\n  pool's children. When provided alongside left/right, it constrains\n  \"next pair\" navigation to siblings within the pool.\n- \"vote on children\" button appears on item pages with ≥2 children,\n  linking to /vote?pool=<item>.\n- Pool is threaded through VoteComparePost → success JS so in-page\n  morph after voting keeps the pool context for next-pair navigation.\n\nCo-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>\n\nSide B — unified diff (full patch):\ndiff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs\nindex 5faa642451d69555cb391974beb0ad22c9355c8c..b79efdb4d52bd445a67f38cbfd61d3507d2b3014 100644\n--- a/server/src/api/ui_html.rs\n+++ b/server/src/api/ui_html.rs\n@@ -193,6 +193,7 @@ async fn dispatch_ui_action(\n             ratio_right,\n             explanation,\n             next,\n+            pool,\n             form_action,\n         } => {\n             if form_action != \"/ui\" {\n@@ -239,6 +240,9 @@ async fn dispatch_ui_action(\n                         .into_response();\n                 }\n             };\n+            let pool_id = pool.as_deref().and_then(|p| {\n+                crate::path_types::ItemId::parse(p.trim()).map(|i| i.normalized_storage())\n+            });\n             let mut rl = ratio_left.trim().parse::<i32>().unwrap_or(0).max(0);\n             let mut rr = ratio_right.trim().parse::<i32>().unwrap_or(0).max(0);\n             if rl == 0 && rr == 0 {\n@@ -294,6 +298,7 @@ async fn dispatch_ui_action(\n                         &thread_tag,\n                         &left_id,\n                         &right_id,\n+                        pool_id.as_ref(),\n                         pid.as_str(),\n                         post_index,\n                     )\ndiff --git a/server/src/html/garden/pin.rs b/server/src/html/garden/pin.rs\nindex 5865cfdbc06aeb6555c97380e25591fae6b3d125..1820d7fe7ee167ecbf5ad5124f23b2ab92ffb01f 100644\n--- a/server/src/html/garden/pin.rs\n+++ b/server/src/html/garden/pin.rs\n@@ -79,7 +79,7 @@ pub(super) fn ont_pin_vote_controls(\n                         }\n                     }\n                 } @else {\n-                    a class=\"ont-vote-compare-btn\" href=(vote_compare_href(nav, pi, &current, None)) title=\"Compare and vote\" {\n+                    a class=\"ont-vote-compare-btn\" href=(vote_compare_href(nav, pi, &current, None, None)) title=\"Compare and vote\" {\n                         span class=\"ont-vote-glyph\" aria-hidden=\"true\" { \"⚖\" }\n                         span { \"vote\" }\n                     }\n@@ -121,7 +121,7 @@ pub(super) fn child_row_pin_or_vote(\n                         if nv == 1 { \"\" } else { \"s\" },\n                     );\n                     @let aria = format!(\"Vote; {} pairwise {}\", nv, if nv == 1 { \"vote\" } else { \"votes\" });\n-                    a class=\"ont-garden-vote-ico\" href=(vote_compare_href(nav, pi, row_item, None)) title=(tip) aria-label=(aria) {\n+                    a class=\"ont-garden-vote-ico\" href=(vote_compare_href(nav, pi, row_item, None, None)) title=(tip) aria-label=(aria) {\n                         span class=\"ont-garden-vote-glyph\" aria-hidden=\"true\" { \"⚖\" }\n                         span class=\"ont-garden-vote-count\" { (format!(\"{}\", nv)) }\n                     }\ndiff --git a/server/src/html/garden/render.rs b/server/src/html/garden/render.rs\nindex 5c3986ca36902f6c9019a4b5590f0b3b9d2cb4ff..bd8cbce059ee789de6e8dc9b6f69f54beee2f994 100644\n--- a/server/src/html/garden/render.rs\n+++ b/server/src/html/garden/render.rs\n@@ -29,6 +29,7 @@ use super::{\n     item::{child_depth_from_uri, item_code_label, item_display_path, item_href},\n     item_page::{build_item_page_view_model, sibling_nav_markup},\n     pin::{child_row_pin_or_vote, ont_pin_vote_controls, pinned_item_from_jar},\n+    vote::vote_pool_href,\n };\n \n pub(super) async fn render_scope_view(\n@@ -186,12 +187,21 @@ pub(super) async fn render_scope_view(\n             }\n \n             section class=\"ont-tab-panel ont-tab-panel-children\" {\n+                @let total_children = model.child_rankings.component_rankings\n+                    .iter().map(|c| c.ranked.len()).sum::<usize>()\n+                    + model.child_rankings.unranked_items.len();\n                 h3 {\n                     \"ranked child groups\"\n                     @if model.child_depth > 1 {\n                         \" \"\n                         span class=\"muted\" { (format!(\"(depth {})\", model.child_depth)) }\n                     }\n+                    @if total_children >= 2 {\n+                        \" \"\n+                        a class=\"ont-vote-children-btn\" href=(vote_pool_href(&nav, &model.item)) {\n+                            \"vote on children\"\n+                        }\n+                    }\n                 }\n                 @if model.child_rankings.component_rankings.is_empty() {\n                     p class=\"muted\" { \"no voted pairs yet in this scope\" }\ndiff --git a/server/src/html/garden/tests.rs b/server/src/html/garden/tests.rs\nindex 6900a6795bcde866a176722149d6378e5127b4c3..c2036fca7752aef63d260e36cfe9649f63b5c550 100644\n--- a/server/src/html/garden/tests.rs\n+++ b/server/src/html/garden/tests.rs\n@@ -105,7 +105,7 @@ fn suggest_next_vote_pair_prefers_unvoted_sibling_pair() {\n     let content = content_for_garden_view(&reduced, &ScopeId::Public);\n     let a = ItemId::parse(\"~/topic/a\").unwrap().normalized_storage();\n     let b = ItemId::parse(\"~/topic/b\").unwrap().normalized_storage();\n-    let next = suggest_next_vote_pair(content, &a, &b).expect(\"next sibling pair\");\n+    let next = suggest_next_vote_pair(content, &a, &b, None).expect(\"next sibling pair\");\n     assert_ne!(\n         canonical_edge_items(&next.0, &next.1),\n         canonical_edge_items(&a, &b)\ndiff --git a/server/src/html/garden/vote.rs b/server/src/html/garden/vote.rs\nindex 1d7fc8aa7436bfa9c1186dfd940a8d751ab7e088..2682cfcbd2f834b56459a02831aa225cffe67c58 100644\n--- a/server/src/html/garden/vote.rs\n+++ b/server/src/html/garden/vote.rs\n@@ -211,14 +211,15 @@ pub(crate) async fn vote_compare_post_success_js(\n     _thread_tag: &str,\n     left: &ItemId,\n     right: &ItemId,\n+    pool: Option<&ItemId>,\n     _post_id: &str,\n     _post_idx: Option<usize>,\n ) -> String {\n     let reduced = state.reduced.read().await;\n     let content = content_for_garden_view(&reduced, &nav.scope());\n     let edge_history = vote_edge_history_markup(content, left, right);\n-    let next_pair = suggest_next_vote_pair(content, left, right);\n-    let nav_markup = vote_compare_nav_markup(nav, next_pair.as_ref());\n+    let next_pair = suggest_next_vote_pair(content, left, right, pool);\n+    let nav_markup = vote_compare_nav_markup(nav, next_pair.as_ref(), pool);\n     drop(reduced);\n     JsBuilder::new()\n         .morph_inner_selector(\"#vote-edge-history-region\", edge_history)\n@@ -231,27 +232,39 @@ pub(super) fn vote_compare_href(\n     left: &ItemId,\n     right: &ItemId,\n     thread_override: Option<&str>,\n+    pool: Option<&ItemId>,\n ) -> String {\n     let left_q = urlencoding::encode(left.as_str());\n     let right_q = urlencoding::encode(right.as_str());\n-    let base = format!(\n+    let mut base = format!(\n         \"{}/vote?left={}&right={}\",\n         nav.room_path_prefix_for_vote_compare(),\n         left_q,\n         right_q\n     );\n     if let Some(t) = thread_override.filter(|s| !s.is_empty()) {\n-        format!(\"{}&thread={}\", base, urlencoding::encode(t))\n-    } else {\n-        base\n+        base = format!(\"{}&thread={}\", base, urlencoding::encode(t));\n+    }\n+    if let Some(p) = pool {\n+        base = format!(\"{}&pool={}\", base, urlencoding::encode(p.as_str()));\n     }\n+    base\n+}\n+\n+pub(super) fn vote_pool_href(nav: &ThreadNav, pool_item_str: &str) -> String {\n+    format!(\n+        \"{}/vote?pool={}\",\n+        nav.room_path_prefix_for_vote_compare(),\n+        urlencoding::encode(pool_item_str)\n+    )\n }\n \n fn vote_compare_nav_markup(\n     nav: &ThreadNav,\n     next_pair: Option<&(ItemId, ItemId)>,\n+    pool: Option<&ItemId>,\n ) -> maud::Markup {\n-    let next_pair_href = next_pair.map(|(nl, nr)| vote_compare_href(nav, nl, nr, None));\n+    let next_pair_href = next_pair.map(|(nl, nr)| vote_compare_href(nav, nl, nr, None, pool));\n     html! {\n         div class=\"vote-compare-nav\" {\n             @if let Some(href) = &next_pair_href {\n@@ -267,8 +280,15 @@ pub(super) fn suggest_next_vote_pair(\n     content: &ContentState,\n     current_left: &ItemId,\n     current_right: &ItemId,\n+    pool_parent: Option<&ItemId>,\n ) -> Option<(ItemId, ItemId)> {\n-    let pool: Vec<ItemId> = if current_left.parent().as_ref().map(|p| p.as_str())\n+    let pool: Vec<ItemId> = if let Some(parent) = pool_parent {\n+        content\n+            .item_children\n+            .get(parent)\n+            .map(|s| s.iter().cloned().collect())\n+            .unwrap_or_default()\n+    } else if current_left.parent().as_ref().map(|p| p.as_str())\n         == current_right.parent().as_ref().map(|p| p.as_str())\n     {\n         current_left\n@@ -322,10 +342,14 @@ pub(super) fn vote_compare_item_card(\n }\n #[derive(Debug, Deserialize)]\n pub struct VoteCompareQuery {\n-    pub left: String,\n-    pub right: String,\n+    #[serde(default)]\n+    pub left: Option<String>,\n+    #[serde(default)]\n+    pub right: Option<String>,\n     #[serde(default)]\n     pub thread: Option<String>,\n+    #[serde(default)]\n+    pub pool: Option<String>,\n }\n \n /// Public pairwise vote UI — `/vote?left=&right=&thread=`.\n@@ -376,17 +400,53 @@ async fn vote_compare_inner(\n     jar: CookieJar,\n     uri: Uri,\n ) -> axum::response::Response {\n-    let left = match ItemId::parse(q.left.trim()) {\n-        Some(i) => i.normalized_storage(),\n-        None => return (StatusCode::NOT_FOUND, \"bad left item\").into_response(),\n+    let pool_id: Option<ItemId> = match q.pool.as_deref() {\n+        Some(p) => match ItemId::parse(p.trim()) {\n+            Some(i) => Some(i.normalized_storage()),\n+            None => return (StatusCode::BAD_REQUEST, \"bad pool item\").into_response(),\n+        },\n+        None => None,\n     };\n-    let right = match ItemId::parse(q.right.trim()) {\n-        Some(i) => i.normalized_storage(),\n-        None => return (StatusCode::NOT_FOUND, \"bad right item\").into_response(),\n+\n+    let (left, right) = match (q.left.as_deref(), q.right.as_deref()) {\n+        (Some(l), Some(r)) => {\n+            let left = match ItemId::parse(l.trim()) {\n+                Some(i) => i.normalized_storage(),\n+                None => return (StatusCode::NOT_FOUND, \"bad left item\").into_response(),\n+            };\n+            let right = match ItemId::parse(r.trim()) {\n+                Some(i) => i.normalized_storage(),\n+                None => return (StatusCode::NOT_FOUND, \"bad right item\").into_response(),\n+            };\n+            if left == right {\n+                return (StatusCode::BAD_REQUEST, \"items must differ\").into_response();\n+            }\n+            (left, right)\n+        }\n+        (None, None) => {\n+            let Some(pool) = pool_id.as_ref() else {\n+                return (StatusCode::BAD_REQUEST, \"provide left+right or pool\").into_response();\n+            };\n+            let reduced = state.reduced.read().await;\n+            let content = content_for_garden_view(&reduced, &nav.scope());\n+            let children: Vec<ItemId> = content\n+                .item_children\n+                .get(pool)\n+                .map(|s| s.iter().cloned().collect())\n+                .unwrap_or_default();\n+            if children.len() < 2 {\n+                drop(reduced);\n+                return (StatusCode::BAD_REQUEST, \"pool has fewer than 2 children to compare\").into_response();\n+            }\n+            let pair = suggest_next_pair_in_pool(&content.ranking_group, &children, None);\n+            drop(reduced);\n+            match pair {\n+                Some(p) => p,\n+                None => return (StatusCode::BAD_REQUEST, \"no pairs available in pool\").into_response(),\n+            }\n+        }\n+        _ => return (StatusCode::BAD_REQUEST, \"provide both left and right, or just pool\").into_response(),\n     };\n-    if left == right {\n-        return (StatusCode::BAD_REQUEST, \"items must differ\").into_response();\n-    }\n \n     let reduced = state.reduced.read().await;\n     let content = content_for_garden_view(&reduced, &nav.scope());\n@@ -409,7 +469,7 @@ async fn vote_compare_inner(\n     let left_body = content.item_bodies.get(&left).cloned();\n     let right_body = content.item_bodies.get(&right).cloned();\n     let item_bodies_for_cards = content.item_bodies.clone();\n-    let next_pair = suggest_next_vote_pair(content, &left, &right);\n+    let next_pair = suggest_next_vote_pair(content, &left, &right, pool_id.as_ref());\n     drop(reduced);\n \n     let title = format!(\n@@ -432,6 +492,7 @@ async fn vote_compare_inner(\n         \"ratio_right\": {\"$form\": \"ratio_right\"},\n         \"explanation\": {\"$form\": \"explanation\"},\n         \"next\": next_path,\n+        \"pool\": pool_id.as_ref().map(|p| p.as_str()),\n         \"form_action\": \"/ui\",\n     }))\n     .expect(\"vote compare rpc json\");\n@@ -456,7 +517,7 @@ async fn vote_compare_inner(\n                 Some(&item_bodies_for_cards),\n             ))\n         }\n-        (vote_compare_nav_markup(&nav, next_pair.as_ref()))\n+        (vote_compare_nav_markup(&nav, next_pair.as_ref(), pool_id.as_ref()))\n         div id=\"vote-edge-history-region\" {\n             (edge_history)\n         }\ndiff --git a/server/src/html/ui_action.rs b/server/src/html/ui_action.rs\nindex dd5294202569454acf9f41b458718700bbf96f39..2589a2cc00bb7b18cd19ebcbb938083122d6921d 100644\n--- a/server/src/html/ui_action.rs\n+++ b/server/src/html/ui_action.rs\n@@ -50,6 +50,9 @@ pub enum HtmlUiAction {\n         explanation: String,\n         /// Same-origin path after successful post (JS redirect).\n         next: String,\n+        /// Pool parent item path, if the vote was initiated from a pool URL.\n+        #[serde(default)]\n+        pool: Option<String>,\n         #[serde(default = \"default_ui_form_action\")]\n         form_action: String,\n     },\n","role":"user"}],"model":"openai/gpt-chat-latest"}