{"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[8d8230d1] reddit\n\nSide A — unified diff (full patch):\ndiff --git a/.gitignore b/.gitignore\nindex 4c7073f9fac0c30fd2050d79a60ef447af58ebeb..ada462e900d24a3a6d08165d158c80f79c35a5a5 100644\n--- a/.gitignore\n+++ b/.gitignore\n@@ -7,3 +7,4 @@\n data/\n repomix-output.xml\n dev-data/\n+.env\ndiff --git a/server/Cargo.toml b/server/Cargo.toml\nindex 7906a8547d56b8e6a48ef59c37aa82a8510fdee9..4677fedcb45292eebebe7e9cf6ce2f5738f18ddf 100644\n--- a/server/Cargo.toml\n+++ b/server/Cargo.toml\n@@ -16,6 +16,7 @@ tower = \"0.5\"\n tower-http = { version = \"0.5\", features = [\"trace\"] }\n tracing = \"0.1\"\n tracing-subscriber = { version = \"0.3\", features = [\"env-filter\"] }\n+reqwest = { version = \"0.12\", features = [\"json\"] }\n \n [dev-dependencies]\n reqwest = { version = \"0.12\", features = [\"json\"] }\ndiff --git a/server/src/html/mod.rs b/server/src/html/mod.rs\nindex 2864407ed6e8ec284a1dc663acf1805534566b62..df6505021d9f446c2b453e20e3eb3cf696a111f9 100644\n--- a/server/src/html/mod.rs\n+++ b/server/src/html/mod.rs\n@@ -272,5 +272,16 @@ pub async fn home(State(state): State<AppState>, uri: Uri) -> impl IntoResponse\n \n pub async fn browse(State(state): State<AppState>, uri: Uri) -> impl IntoResponse {\n     let item = ItemId::from_browse_uri(uri.path()).unwrap_or(ItemId::root());\n+    if item.as_str().starts_with(\"reddit.com\") {\n+        let needs_fetch = {\n+            let tree = state.tree.read().await;\n+            tree.get(&item)\n+                .map(|n| n.data.is_none())\n+                .unwrap_or(true)\n+        };\n+        if needs_fetch {\n+            state.reddit.request_fetch(item.clone());\n+        }\n+    }\n     item_page(state, uri, item).await\n }\ndiff --git a/server/src/reddit.rs b/server/src/reddit.rs\nindex d203dca09245daf869b3aa942898447700ae69fb..90053ad03b1d7c8e94f325dd4ee64c2b4f7da900 100644\n--- a/server/src/reddit.rs\n+++ b/server/src/reddit.rs\n@@ -1,4 +1,12 @@\n-//! Reddit API import (async, decoupled from UI request path).\n+//! Reddit API import via a single background worker (rate limits, dedup, backoff).\n+\n+use std::collections::{HashMap, HashSet};\n+use std::sync::Arc;\n+use std::time::{Duration, Instant};\n+\n+use reqwest::{header, Client, StatusCode};\n+use serde::Deserialize;\n+use tokio::sync::{mpsc, RwLock};\n \n use crate::{\n     path_types::ItemId,\n@@ -10,12 +18,401 @@ pub fn ensure_partial_tree(tree: &mut GlobalTree, id: &ItemId) {\n     tree.ensure_path(id);\n }\n \n-/// Placeholder for Reddit JSON import. Returns entity data when implemented.\n-pub async fn fetch_reddit_entity(_id: &ItemId) -> Option<EntityData> {\n-    None\n+pub struct RedditCommand {\n+    pub id: ItemId,\n+}\n+\n+#[derive(Clone)]\n+pub struct RedditBroker {\n+    tx: mpsc::Sender<RedditCommand>,\n+}\n+\n+#[derive(Clone)]\n+struct RedditCredentials {\n+    client_id: String,\n+    client_secret: String,\n+}\n+\n+struct OAuthToken {\n+    access_token: String,\n+    expires_at: Instant,\n+}\n+\n+impl RedditBroker {\n+    pub fn spawn(tree: Arc<RwLock<GlobalTree>>, user_agent: &str) -> Self {\n+        let (tx, rx) = mpsc::channel(100);\n+\n+        let mut headers = header::HeaderMap::new();\n+        headers.insert(\n+            header::USER_AGENT,\n+            header::HeaderValue::from_str(user_agent).expect(\"valid user agent\"),\n+        );\n+\n+        let client = Client::builder()\n+            .default_headers(headers)\n+            .timeout(Duration::from_secs(15))\n+            .build()\n+            .expect(\"reqwest client\");\n+\n+        let creds = RedditCredentials::from_env();\n+        tokio::spawn(reddit_worker(rx, tree, client, creds));\n+\n+        Self { tx }\n+    }\n+\n+    /// Fire-and-forget: queue a fetch; worker updates the tree when done.\n+    pub fn request_fetch(&self, id: ItemId) {\n+        let _ = self.tx.try_send(RedditCommand { id });\n+    }\n+}\n+\n+impl RedditCredentials {\n+    fn from_env() -> Option<Self> {\n+        let client_id = std::env::var(\"REDDIT_CLIENT_ID\").ok()?;\n+        let client_secret = std::env::var(\"REDDIT_CLIENT_SECRET\").ok()?;\n+        if client_id.is_empty() || client_secret.is_empty() {\n+            return None;\n+        }\n+        Some(Self {\n+            client_id,\n+            client_secret,\n+        })\n+    }\n+}\n+\n+pub fn default_user_agent() -> String {\n+    std::env::var(\"REDDIT_USER_AGENT\").unwrap_or_else(|_| {\n+        \"web:sorter2.social:v0.0.1 (by /u/sorter2)\".to_string()\n+    })\n }\n \n-/// Apply fetched entity data to a node (called from async worker).\n-pub fn apply_entity(tree: &mut GlobalTree, id: &ItemId, data: EntityData) {\n-    tree.set_entity_data(id, data);\n+async fn reddit_worker(\n+    mut rx: mpsc::Receiver<RedditCommand>,\n+    tree: Arc<RwLock<GlobalTree>>,\n+    client: Client,\n+    creds: Option<RedditCredentials>,\n+) {\n+    let mut in_flight = HashSet::new();\n+    let mut recently_fetched: HashMap<ItemId, Instant> = HashMap::new();\n+    let mut current_delay = Duration::from_secs(1);\n+    let mut oauth: Option<OAuthToken> = None;\n+    let cache_ttl = Duration::from_secs(300);\n+\n+    while let Some(cmd) = rx.recv().await {\n+        let now = Instant::now();\n+        recently_fetched.retain(|_, t| now.duration_since(*t) < cache_ttl);\n+\n+        if in_flight.contains(&cmd.id) || recently_fetched.contains_key(&cmd.id) {\n+            continue;\n+        }\n+\n+        in_flight.insert(cmd.id.clone());\n+        let fetch_id = cmd.id.clone();\n+\n+        tokio::time::sleep(current_delay).await;\n+\n+        if let Some(c) = &creds {\n+            oauth = ensure_oauth_token(&client, c, oauth.take()).await;\n+        }\n+\n+        let token = oauth.as_ref().map(|t| t.access_token.as_str());\n+        let use_oauth = token.is_some();\n+\n+        match do_fetch(&client, &fetch_id, use_oauth, token).await {\n+            Ok(FetchOutcome::Entity(data)) => {\n+                let mut w = tree.write().await;\n+                w.set_entity_data(&fetch_id, data);\n+                recently_fetched.insert(fetch_id.clone(), Instant::now());\n+                current_delay = Duration::from_millis(600);\n+            }\n+            Ok(FetchOutcome::NotFound) => {\n+                recently_fetched.insert(fetch_id.clone(), Instant::now());\n+            }\n+            Ok(FetchOutcome::RateLimited { reset_secs }) => {\n+                let wait = Duration::from_secs(reset_secs.max(1));\n+                tracing::warn!(\n+                    \"Reddit rate limit for {}; sleeping {}s\",\n+                    fetch_id,\n+                    wait.as_secs()\n+                );\n+                tokio::time::sleep(wait).await;\n+                current_delay = (current_delay * 2).min(Duration::from_secs(60));\n+            }\n+            Err(e) => {\n+                tracing::warn!(\"Reddit fetch failed for {}: {}\", fetch_id, e);\n+                current_delay = (current_delay * 2).min(Duration::from_secs(60));\n+            }\n+        }\n+\n+        in_flight.remove(&fetch_id);\n+    }\n+}\n+\n+enum FetchOutcome {\n+    Entity(EntityData),\n+    NotFound,\n+    RateLimited { reset_secs: u64 },\n+}\n+\n+async fn ensure_oauth_token(\n+    client: &Client,\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+            return Some(t);\n+        }\n+    }\n+\n+    let resp = client\n+        .post(\"https://www.reddit.com/api/v1/access_token\")\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+\n+    if !resp.status().is_success() {\n+        tracing::warn!(\"Reddit OAuth token HTTP {}\", resp.status());\n+        return None;\n+    }\n+\n+    #[derive(Deserialize)]\n+    struct TokenResponse {\n+        access_token: String,\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+\n+    Some(OAuthToken {\n+        access_token: body.access_token,\n+        expires_at: Instant::now() + Duration::from_secs(body.expires_in),\n+    })\n+}\n+\n+async fn do_fetch(\n+    client: &Client,\n+    id: &ItemId,\n+    use_oauth: bool,\n+    bearer: Option<&str>,\n+) -> Result<FetchOutcome, String> {\n+    let url = map_item_to_reddit_api(id, use_oauth);\n+    if url.is_empty() {\n+        return Ok(FetchOutcome::NotFound);\n+    }\n+\n+    let mut req = client.get(&url);\n+    if let Some(token) = bearer {\n+        req = req.bearer_auth(token);\n+    }\n+\n+    let resp = req.send().await.map_err(|e| e.to_string())?;\n+\n+    if resp.status() == StatusCode::TOO_MANY_REQUESTS {\n+        let reset = rate_limit_reset_secs(&resp);\n+        return Ok(FetchOutcome::RateLimited { reset_secs: reset });\n+    }\n+\n+    if resp.status() == StatusCode::SERVICE_UNAVAILABLE {\n+        return Err(\"Reddit unavailable (503)\".to_string());\n+    }\n+\n+    if !resp.status().is_success() {\n+        return Ok(FetchOutcome::NotFound);\n+    }\n+\n+    if rate_limit_remaining(&resp) == Some(0) {\n+        let reset = rate_limit_reset_secs(&resp);\n+        return Ok(FetchOutcome::RateLimited { reset_secs: reset });\n+    }\n+\n+    let bytes = resp.bytes().await.map_err(|e| e.to_string())?;\n+    Ok(parse_reddit_json(id, &bytes)\n+        .map(FetchOutcome::Entity)\n+        .unwrap_or(FetchOutcome::NotFound))\n+}\n+\n+fn rate_limit_remaining(resp: &reqwest::Response) -> Option<u64> {\n+    resp.headers()\n+        .get(\"x-ratelimit-remaining\")\n+        .and_then(|v| v.to_str().ok())\n+        .and_then(|s| s.parse::<f64>().ok())\n+        .map(|f| f.floor() as u64)\n+}\n+\n+fn rate_limit_reset_secs(resp: &reqwest::Response) -> u64 {\n+    resp.headers()\n+        .get(\"x-ratelimit-reset\")\n+        .and_then(|v| v.to_str().ok())\n+        .and_then(|s| s.parse::<f64>().ok())\n+        .map(|f| f.ceil() as u64)\n+        .unwrap_or(5)\n+}\n+\n+/// Map canonical item id to Reddit JSON API URL.\n+pub fn map_item_to_reddit_api(id: &ItemId, oauth: bool) -> String {\n+    let path = id.as_str();\n+    if !path.starts_with(\"reddit.com/\") && path != \"reddit.com\" {\n+        return String::new();\n+    }\n+\n+    let base = if oauth {\n+        \"https://oauth.reddit.com\"\n+    } else {\n+        \"https://www.reddit.com\"\n+    };\n+\n+    let segments: Vec<&str> = path.split('/').collect();\n+\n+    if let Some(i) = segments.iter().position(|&p| p == \"comments\") {\n+        if segments.len() > i + 1 {\n+            let api_path = segments[1..=i + 1].join(\"/\");\n+            return format!(\"{base}/{api_path}.json?raw_json=1\");\n+        }\n+    }\n+\n+    if segments.len() == 3 && segments[1] == \"r\" {\n+        return format!(\"{base}/r/{}/about.json?raw_json=1\", segments[2]);\n+    }\n+\n+    String::new()\n+}\n+\n+fn parse_reddit_json(id: &ItemId, bytes: &[u8]) -> Option<EntityData> {\n+    let v: serde_json::Value = serde_json::from_slice(bytes).ok()?;\n+    let segments: Vec<&str> = id.as_str().split('/').collect();\n+\n+    if segments.iter().any(|&p| p == \"comments\") {\n+        parse_post_listing(&v)\n+    } else {\n+        parse_subreddit_about(&v)\n+    }\n+}\n+\n+fn parse_subreddit_about(v: &serde_json::Value) -> Option<EntityData> {\n+    let data = v.get(\"data\")?;\n+    let title = data\n+        .get(\"title\")\n+        .or_else(|| data.get(\"display_name\"))\n+        .and_then(|t| t.as_str())?\n+        .to_string();\n+    let body_html = data\n+        .get(\"public_description_html\")\n+        .or_else(|| data.get(\"public_description\"))\n+        .and_then(|t| t.as_str())\n+        .map(|s| s.to_string());\n+    let thumb_url = data\n+        .get(\"icon_img\")\n+        .or_else(|| data.get(\"community_icon\"))\n+        .and_then(|t| t.as_str())\n+        .filter(|s| !s.is_empty())\n+        .map(|s| s.to_string());\n+\n+    Some(EntityData {\n+        title,\n+        author: None,\n+        body_html,\n+        thumb_url,\n+    })\n+}\n+\n+fn parse_post_listing(v: &serde_json::Value) -> Option<EntityData> {\n+    let listing = v.as_array()?.first()?;\n+    let child = listing\n+        .pointer(\"/data/children/0/data\")?;\n+    let title = child.get(\"title\")?.as_str()?.to_string();\n+    let author = child\n+        .get(\"author\")\n+        .and_then(|a| a.as_str())\n+        .filter(|a| *a != \"[deleted]\")\n+        .map(|s| s.to_string());\n+    let body_html = child\n+        .get(\"selftext_html\")\n+        .and_then(|t| t.as_str())\n+        .filter(|s| !s.is_empty())\n+        .map(|s| s.to_string());\n+    let thumb_url = child\n+        .get(\"thumbnail\")\n+        .and_then(|t| t.as_str())\n+        .filter(|s| s.starts_with(\"http\"))\n+        .map(|s| s.to_string());\n+\n+    Some(EntityData {\n+        title,\n+        author,\n+        body_html,\n+        thumb_url,\n+    })\n+}\n+\n+#[cfg(test)]\n+mod tests {\n+    use super::*;\n+\n+    #[test]\n+    fn map_subreddit_about_url() {\n+        let id = ItemId::parse(\"reddit.com/r/rust\").unwrap();\n+        assert_eq!(\n+            map_item_to_reddit_api(&id, false),\n+            \"https://www.reddit.com/r/rust/about.json?raw_json=1\"\n+        );\n+        assert_eq!(\n+            map_item_to_reddit_api(&id, true),\n+            \"https://oauth.reddit.com/r/rust/about.json?raw_json=1\"\n+        );\n+    }\n+\n+    #[test]\n+    fn map_post_url() {\n+        let id =\n+            ItemId::parse(\"reddit.com/r/amitheasshole/comments/1trnvdl\").unwrap();\n+        assert_eq!(\n+            map_item_to_reddit_api(&id, false),\n+            \"https://www.reddit.com/r/amitheasshole/comments/1trnvdl.json?raw_json=1\"\n+        );\n+    }\n+\n+    #[test]\n+    fn map_non_reddit_empty() {\n+        let id = ItemId::opaque(\"example.com/foo\");\n+        assert!(map_item_to_reddit_api(&id, false).is_empty());\n+    }\n+\n+    #[test]\n+    fn parse_subreddit_fixture() {\n+        let json = r#\"{\"kind\":\"t5\",\"data\":{\"title\":\"Rust\",\"display_name\":\"rust\",\"public_description\":\"systems\"}}\"#;\n+        let entity = parse_reddit_json(\n+            &ItemId::parse(\"reddit.com/r/rust\").unwrap(),\n+            json.as_bytes(),\n+        )\n+        .unwrap();\n+        assert_eq!(entity.title, \"Rust\");\n+    }\n+\n+    #[test]\n+    fn parse_post_fixture() {\n+        let json = r#\"[{\"kind\":\"Listing\",\"data\":{\"children\":[{\"kind\":\"t3\",\"data\":{\"title\":\"AITA\",\"author\":\"op\",\"selftext_html\":\"&lt;p&gt;hi&lt;/p&gt;\",\"thumbnail\":\"https://b.thumbs.redditmedia.com/x.jpg\"}}]}}]\"#;\n+        let entity = parse_reddit_json(\n+            &ItemId::parse(\"reddit.com/r/x/comments/abc\").unwrap(),\n+            json.as_bytes(),\n+        )\n+        .unwrap();\n+        assert_eq!(entity.title, \"AITA\");\n+        assert_eq!(entity.author.as_deref(), Some(\"op\"));\n+    }\n }\ndiff --git a/server/src/state.rs b/server/src/state.rs\nindex cc1722f5a5bf4d415f2327ea585c488a15a75592..8c03aa60c15aee803a534439400b69935b1a3d84 100644\n--- a/server/src/state.rs\n+++ b/server/src/state.rs\n@@ -5,9 +5,10 @@ use tokio::sync::RwLock;\n use crate::{\n     event_log::EventLog,\n     events::Event,\n+    journal::JournalClient,\n     path_types::ItemId,\n+    reddit::{default_user_agent, RedditBroker},\n     reducer::{GlobalTree, VoteData},\n-    journal::JournalClient,\n     views::ViewStore,\n };\n \n@@ -73,6 +74,7 @@ pub struct AppState {\n     pub views: ViewStore,\n     pub tree: Arc<RwLock<GlobalTree>>,\n     journal: JournalClient,\n+    pub reddit: RedditBroker,\n }\n \n impl AppState {\n@@ -112,6 +114,7 @@ impl AppState {\n \n         let tree = Arc::new(RwLock::new(tree));\n         let journal = JournalClient::spawn(tree.clone(), event_log.clone());\n+        let reddit = RedditBroker::spawn(tree.clone(), &default_user_agent());\n \n         Self {\n             cfg: Arc::new(cfg),\n@@ -119,6 +122,7 @@ impl AppState {\n             views,\n             tree,\n             journal,\n+            reddit,\n         }\n     }\n \n@@ -127,8 +131,11 @@ impl AppState {\n             id: id.as_str().to_string(),\n         };\n         self.event_log.append(&event).await.map_err(|e| e.to_string())?;\n-        let mut w = self.tree.write().await;\n-        w.ensure_path(id);\n+        {\n+            let mut w = self.tree.write().await;\n+            w.ensure_path(id);\n+        }\n+        self.reddit.request_fetch(id.clone());\n         Ok(())\n     }\n \ndiff --git a/todo b/todo\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..d196e8cb4cc80ccb95eeff01c73607d520e13212\n--- /dev/null\n+++ b/todo\n@@ -0,0 +1,7 @@\n+reddit import (only on explicit request)\n+reddit rendering\n+vote redering\n+pair chosing\n+nsfw gate\n+\n+logins (uuid user, two sides, oauths, and pseudonyms)\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":"~x-ai/grok-latest"}