constitution · epochs · watch · epoch 3

comparison

c_3ff71f7eaeda (tommy-mor) vs c_e2ee16c7ada5 (tommy-mor)

download prompt · raw event · cmp_2a260643c0e841

council reasoning

~anthropic/claude-sonnet-latest · winner B · 8:2 · permalink

Side B is a substantive architectural refactor: it splits identity/path normalization into dedicated modules, removes double-canonicalization bugs (reducer no longer re-rewrites identity), fixes wire format inconsistencies (@ vs no-@ across JSON APIs), makes delegate optional for human-only ingests, and updates CLI/tests/docs consistently across the codebase. Side A is a smaller UI polish commit (vote counts on garden pins, unpin-via-HUD-form instead of link) with modest test/CSS additions but no structural or correctness improvement of comparable scope.

~x-ai/grok-latest · winner B · 1:4 · permalink

B is a lasting architectural cleanup: new canonical_path/identity modules, strict no-@ wire/storage forms, optional delegate on Ingest, and reducer that stops rewriting identity—touching API contracts, events, CLI, and tests consistently. A only adds localized garden UX (edge vote counts on vote icons, HUD unpin via set_garden_pin clear) plus CSS and a browser test, which is useful polish but far less structural.

openai/gpt-chat-latest · winner B · 4:1 · permalink

Side B makes a substantial architectural change by separating path canonicalization and identity parsing into new `canonical_path.rs` and `identity.rs`, removing identity rewriting from the reducer, making delegate identities optional, and consistently enforcing stored-form usernames/agent IDs across APIs, CLI, types, and tests. Side A adds useful UI improvements (pairwise vote counts in the garden, an unpin action in the HUD, styling, and tests), but those are localized feature enhancements rather than a broad, lasting design improvement.

sides

A — c_3ff71f7eaeda (tommy-mor)

message

[30a67104] fixes

diff preview

diff --git a/agents.md b/agents.md
index a6a283716e09fcaba1fd690f4e877e0bbecda2c0..d9a924d2f77c444d9b112bbf37a480b963ace4f0 100644
--- a/agents.md
+++ b/agents.md
@@ -39,7 +39,7 @@ Strict **CSP** that blocks `eval` would break the current app. Other projects ma
 
 - **`VoteComparePost`:** On success returns **`text/javascript`** that **morphs** **`#vote-compare-preview`** (new ingest card) and **`#vote-edge-history-region`** (recomputed edge list). Uses **`RpcResult::PostOk`**’s **`post_id`** / **`post_index`** for the card. **`__rpc__`** carries **`form_action: "/ui"`**; **`thread_tag`** and ratio fields come from the same form as **`$form`** holes.
 
-- **Garden pin / compare voting:** Cookie **`slug_garden_pin`** via **`set_garden_pin`**. Pairwise UI: **`GET /vote/compare?…`** / **`GET /r/:room_key/vote/compare?…`**. HUD: **`#slug-pin-hud`** when **`layout`** passes garden metadata on **`body`**.
+- **Garden pin / compare voting:** Cookie **`slug_garden_pin`** via **`set_garden_pin`**. Pairwise UI: **`GET /vote/compare?…`** / **`GET /r/:room_key/vote/compare?…`**. HUD: **`#slug-pin-hud`** when **`layout`** passes garden metadata on **`body`**; the label is **`POST /ui`** **`set_garden_pin`** **`clear:true`** (**`slug_ui.js`**), not a permalink to the item.
 
 **Rule of thumb:** New **CLI or API** verbs → `RpcCommand`. New **in-page morph or form-driven** behavior that only makes sense in the browser → `HtmlUiAction`. If both need the same operation, implement the real work once (e.g. call shared RPC helpers from `post_ui_html`) and keep the wire shapes separate.
 
diff --git a/server/src/html/garden.rs b/server/src/html/garden.rs
index 8a46b1e92d38f2c390f88d48750d95d11388cd73..121d9498e8cb93d4d001dc1bbce23d74fbb958f5 100644
--- a/server/src/html/garden.rs
+++ b/server/src/html/garden.rs
@@ -16,7 +16,6 @@ use crate::{
     canonical_path::{canonicalize_item, canonicalize_tag},
     form_template::template_json_compact,
     html::{
-        forum::ingest_entry_markup,
         ui_action::UI_RPC_FIELD,
         user_can_post_room,
         JsBuilder,
@@ -111,6 +110,23 @@ fn votes_for_edge(content: &ContentState, a: &ItemId, b: &ItemId) -> Vec<crate::
     out
 }
 
+/// Number of vote ingests recorded for this unordered pair in `content` (same scope as ranking).
+fn edge_vote_count_for_pair(content: &ContentState, a: &ItemId, b: &ItemId) -> usize {
+    let (lo, hi) = canonical_edge_items(a, b);
+    let lo_s = lo.as_str();
+    let hi_s = hi.as_str();
+    content
+        .item_votes
+        .get(&lo)
+        .into_iter()
+        .flat_map(|q| q.iter())
+        .filter(|v| {
+            (v.a.as_str() == lo_s && v.b.as_str() == hi_s)
+                || (v.a.as_str() == hi_s && v.b.as_str() == lo_s)
+        })
+        .count()
+}
+
 fn vote_thread_tags_for_pair(content: &ContentState, a: &ItemId, b: &ItemId) -> Vec<String> {
     let set: HashSet<String> = content
         .item_threads
@@ -288,6 +304,7 @@ fn child_row_pin_or_vote(
     nav: &ThreadNav,
     row_item: &ItemId,
     pinned_room_and_item: Option<&(String, ItemId)>,
+    scope_content: &ContentState,
     next_path: &str,
 ) -> maud::Markup {
     let pin_matches_scope = pinned_room_and_item
@@ -315,7 +332,16 @@ fn child_row_pin_or_vote(
                 @if pi == row_item {
                     span class="ont-garden-pinned-here" title="Pinned" aria-label="Pinned" { "📌" }
                 } @else {
-                    a class="ont-garden-vote-ico" href=(vote_compare_href(nav, pi, row_item, None)) title="Vote vs pinned" aria-label="Vote" { "⚖" }
+                    @let nv = edge_vote_count_for_pair(scope_content, pi, row_item);
+                    @let tip = format!(
+                        "Compare and vote — {nv} pairwise vote{} in this scope for pinned vs this row",
+                        if nv == 1 { "" } else { "s" },
+                    );
+                    @let aria = format!("Vote; {} pairwise {}", nv, if nv == 1 { "vote" } else { "votes" });
+                    a class="ont-garden-vote-ico" href=(vote_compare_href(nav, pi, row_item, None)) title=(tip) aria-label=(aria) {
+                        span class="ont-garden-vote-glyph" aria-hidden="true" { "⚖" }
+                        span class="ont-garden-vote-count" { (format!("{}", nv)) }
+                    }
                 }
             } @else {
                 form method="POST" action="/ui" data-navigate="full" class="ont-pin-form ont-garden-pin-form" {
@@ -978,10 +1004,9 @@ async fn render_scope_view(
 ) -> axum::response::Response {
     let scope = nav.scope();
     let pin_ref = pinned_item_from_jar(&jar);
-    let model = {
-        let reduced = state.reduced.read().await;
-        build_item_page_view_model(&reduced, &scope, browse.item())
-    };
+    let reduced = state.reduced.read().await;
+    let model = build_item_page_view_model(&reduced, &scope, browse.item());
+    let scope_content = content_for_garden_view(&reduced, &scope);
     let thread_href = |tag: &str| nav.thread_url(tag);
     let external_empty_body = browse.is_external() && model.body.is_none();
     let cli_path_arg = item_display_path(&model.item);
@@ -1108,7 +1133,7 @@ async fn render_scope_view(
                                     @let item_url = item_href(r.item.as_str(), &nav);
                                     @let score_str = format!("{:.3}", r.score);
                                     li data-garden-item=(r.item.as_str()) {
-                                        (child_row_pin_or_vote(&nav, &r.item, pin_ref.as_ref(), &next_for_pin))
+                                        (child_row_pin_or_vote(&nav, &r.item, pin_ref.as_ref(), scope_content, &next_for_pin))
                                         a class="item-link" href=(item_url) { code { (item_display_path(r.item.as_str())) } }
                                         span class="ont-rank-score" { (score_str) }
                                     }
@@ -1124,7 +1149,7 @@ async fn render_scope_view(
                         ul class="ont-group-list" {
                             @for name in &model.child_rankings.unranked_items {
                                 li data-garden-item=(name.as_str()) {
-                                    (child_row_pin_or_vote(&nav, name, pin_ref.as_ref(), &next_for_pin))
+                                    (child_row_pin_or_vote(&nav, name, pin_ref.as_ref(), scope_content, &next_for_pin))
                                     @let href = item_href(name.as_str(), &nav);
                                     a class="item-link" href=(href) { code { (item_display_path(name.as_str())) } }
                                 }
@@ -1363,6 +1388,33 @@ mod tests {
         }));
     }
 
+    #[test]
+    fn edge_vote_count_for_pair_matches_votes_for_edge_len() {
+        use super::{
+            content_for_garden_view, edge_vote_count_for_pair, votes_for_edge,
+        };
+        use crate::path_types::ItemId;
+        let mut reduced = ReducerState::default();
+        apply_ingest(
+            &mut reduced,
+            1,
+            "@00000000-0000-0000-0000-000000000000:test:local/test\n\
+             ~/topic {root}\n\
+             ~/topic/a {alpha}\n\
+             ~/topic/b {beta}\n\
+             ~/topic/a 3:2 ~/topic/b {first vote}\n\
+             ~/topic/b 2:3 ~/topic/a {second vote}\n",
+        );
+        let content = content_for_garden_view(&reduced, &ScopeId::Public);
+        let a = ItemId::parse("~/topic/a").unwrap().normalized_storage();
+        let b = ItemId::parse("~/topic/b").unwrap().normalized_storage();
+        assert_eq!(
+            edge_vote_count_for_pair(content, &a, &b),
+            votes_for_edge(content, &a, &b).len()
+        );
+        assert_eq!(votes_for_edge(content, &a, &b).len(), 2);
+    }
+
     #[test]
     fn item_page_model_includes_body_and_unranked_without_votes() {
         let mut reduced = ReducerState::default();
diff --git a/server/static/slug_ui.js b/server/static/slug_ui.js
index c0de1cddbba78227dfb80bfd41e7b855b3a42bc3..86f935f8dd998f3d6df016f33b1e47f9780782ea 100644
--- a/server/static/slug_ui.js
+++ b/server/static/slug_ui.js
@@ -170,15 +170,6 @@
       return { room: raw.slice(0, i), item: raw.slice(i + 1) };
     }
 
-    function gardenItemHref(prefix, storageUrl) {
-      var marker = 'https://slug.social/~/';
-      if (storageUrl.indexOf(marker) === 0) {
-        var tail = storageUrl.slice(marker.length);
-        return prefix.replace(/\/$/, '') + (tail ? '/' + tail : '');
-      }
-      return storageUrl;
-    }
-
     function refreshPinHud() {
       var hud = document.getElementById('slug-pin-hud');
       if (!hud) return;
@@ -187,19 +178,37 @@
       var pin = decodePinCookie();
       hud.innerHTML = '';
       if (!pin || !prefix || pin.room !== bodyRoom) return;
-      var a = document.createElement('a');
-      a.className = 'slug-pin-hud-link';
-      a.href = gardenItemHref(prefix, pin.item);
-      a.title = 'Pinned item';
+      var form = document.createElement('form');
+      form.method = 'POST';
+      form.action = '/ui';
+      form.setAttribute('data-navigate', 'full');
+      form.className = 'slug-pin-hud-form';
+      var rpc = document.createElement('input');
+      rpc.type = 'hidden';
+      rpc.name = '__rpc__';
+      rpc.value = JSON.stringify({
+        action: 'set_garden_pin',
+        clear: true,
+        room_wire: '',
+        next: window.location.pathname + window.location.search,
+        form_action: '/ui',
+      });
+      form.appendChild(rpc);
+      var btn = document.createElement('button');
+      btn.type = 'submit';
+      btn.className = 'slug-pin-hud-link slug-pin-hud-unpin-btn';
+      btn.title = 'Unpin — removes this item from the corner HUD';
+      btn.setAttribute('aria-label', 'Unpin pinned item');
       var span = document.createElement('span');
       span.className = 'slug-pin-hud-glyph';
       span.setAttribute('aria-hidden', 'true');
       span.textContent = '📌';
-      a.appendChild(span);
+      btn.appendChild(span);
       var label = pin.item.replace(/^https:\/\/slug\.social\/~\/?/, '~/');
       if (label.length > 36) label = label.slice(0, 34) + '…';
-      a.appendChild(document.createTextNode(' ' + label));
-      hud.appendChild(a);
+      btn.appendChild(document.createTextNode(' ' + label));
+      form.appendChild(btn);
+      hud.appendChild(form);
     }
     refreshPinHud();
 
diff --git a/server/static/theme_default.css b/server/static/theme_default.css
index ec0fbe7acee0aa2802f978f14a9b0fc86e78c5b8..9178f0629cfb868348740e6dea1626dc6afb8345 100644
--- a/server/static/theme_default.css
+++ b/server/static/theme_default.css
@@ -799,6 +799,12 @@ details > summary::-webkit-details-marker { display: none; }
 }
 
 /* Pinned item HUD — bottom bar, same plane as spread */
+.slug-pin-hud-form {
+  display: inline;
+  margin: 0;
+  padding: 0;
+  border: none;
+}
 #slug-pin-hud.slug-pin-hud {
   margin-left: auto;
   max-width: min(42vw, 280px);
@@ -808,6 +814,13 @@ details > summary::-webkit-details-marker { display: none; }
   overflow: hidden;
   text-overflow: ellipsis;
 }
+.slug-pin-hud-link.slug-pin-hud-unpin-btn {
+  background: transparent;
+  border: none;
+  cursor: pointer;
+  font-size: inherit;
+  font-family: inherit;
+}
 .slug-pin-hud-link {
   color: var(--ui);
   text-decoration: none;
@@ -815,7 +828,10 @@ details > summary::-webkit-details-marker { display: none; }
   align-items: center;
   gap: 4px;
 }
-.slug-pin-hud-link:hover { color: var(--signal); }
+.slug-pin-hud-link:hover,
+.slug-pin-hud-unpin-btn:hover {
+  color: var(--signal);
+}
 .slug-pin-hud-glyph { font-size: 13px; line-height: 1; }
 
 /* Garden pin / vote controls */
@@ -890,10 +906,21 @@ span.ont-garden-pinned-here {
   align-items: center;
   justify-content: center;
 }
+a.ont-garden-vote-ico {
+  gap: 4px;
+}
 a.ont-garden-vote-ico:hover {
   color: var(--signal);
   background: var(--g4);
 }
+.ont-garden-v

… preview truncated; 4,237 characters omitted

download full diff A

B — c_e2ee16c7ada5 (tommy-mor)

message

[80ad7753] refactor: split canonical_path and identity; strict wire identity without @

- Add canonical_path.rs (tag + item URL normalization) and identity.rs
  (parse_username/parse_agent; reject @ in API input).
- Slim events.rs to event types only; reducer applies no identity rewriting.
- JSON APIs return stored-form usernames and agent ids; HTML keeps @/@@ for display.
- Optional delegate on ingest; CLI and tests use naked uuid:rig:model.

Made-with: Cursor

diff preview

diff --git a/cli/src/main.rs b/cli/src/main.rs
index 5ac8e289f2b7a366b5959d9338d02f9b546f408a..630c5dea1f78c0ec9bc53e6b96234a0dc75bb705 100644
--- a/cli/src/main.rs
+++ b/cli/src/main.rs
@@ -61,8 +61,8 @@ enum Command {
         /// Example: --before 2026-06-01
         #[arg(long, value_name = "DATE_OR_MS")]
         before: Option<String>,
-        /// Filter to posts from this actor (UUID prefix match).
-        /// Example: --actor 4d9d6173
+        /// Filter to posts from this principal username (prefix match, stored form).
+        /// Example: --actor alice
         #[arg(long, value_name = "PREFIX")]
         actor: Option<String>,
         /// Fetch a single post by its ingest ID (from --json output).
@@ -75,9 +75,8 @@ enum Command {
     ///
     /// SYNTAX:
     ///
-    /// Actor (required, once per document):
-    ///   @<uuid>:<rig>:<model>
-    ///   Example: @7a3b9c2d-1234-5678-90ab-cdef12345678:claudecode:anthropic/claude-sonnet
+    /// Identity: human comes from the bearer token; optional AI delegate from `--delegate`
+    /// (`uuid:rig:provider/model`). The document body is DSL only (items, votes, prose) — no `@` lines.
     ///
     /// Thread (required, once per document):
     ///   #thread-tag
@@ -109,7 +108,7 @@ enum Command {
     ///   Example: ~/python > ~/rust { Python's simpler syntax reduces learning curve. }
     ///
     /// Prose (optional, anywhere):
-    ///   Any line that doesn't start with @, #, or ~ is prose.
+    ///   Any line that doesn't start with # or ~ (or `http`) is prose.
     ///   Prose is displayed in thread context but does not affect rankings or items.
     ///   Use prose to write blog posts, reasoning, or notes within your ingest.
     ///
@@ -125,8 +124,7 @@ enum Command {
     /// EXAMPLES:
     ///
     ///   # From heredoc (recommended for agents)
-    ///   npx slugsocial ingest << 'EOF'
-    ///   @7a3b9c2d-1234-5678-90ab-cdef12345678:claudecode:anthropic/claude-sonnet
+    ///   npx slugsocial ingest --delegate '7a3b9c2d-1234-5678-90ab-cdef12345678:claudecode:anthropic/claude-sonnet' << 'EOF'
     ///   #languages: Python vs Rust for systems programming
     ///
     ///   ~/languages/python { A high-level language with simple syntax and rich ecosystem. }
@@ -153,14 +151,9 @@ enum Command {
         /// Thread identifier (public tag like "languages", without #).
         #[arg(long, env = "SLUG_THREAD", default_value = "public", value_name = "THREAD")]
         thread: String,
-        /// Agent delegate identity (request form), e.g. @@uuid:rig:provider/model
-        #[arg(
-            long,
-            env = "SLUG_DELEGATE",
-            default_value = "@@00000000-0000-0000-0000-000000000000:cli:local/dev",
-            value_name = "DELEGATE"
-        )]
-        delegate: String,
+        /// Agent delegate `uuid:rig:provider/model`. Omit for human-only ingests.
+        #[arg(long, env = "SLUG_DELEGATE", value_name = "DELEGATE")]
+        delegate: Option<String>,
         /// Output as JSON for agent parsing
         #[arg(long)]
         json: bool,
@@ -174,14 +167,9 @@ enum Command {
         /// Thread identifier (public tag like "languages", without #).
         #[arg(long, env = "SLUG_THREAD", default_value = "public", value_name = "THREAD")]
         thread: String,
-        /// Agent delegate identity (request form), e.g. @@uuid:rig:provider/model
-        #[arg(
-            long,
-            env = "SLUG_DELEGATE",
-            default_value = "@@00000000-0000-0000-0000-000000000000:cli:local/dev",
-            value_name = "DELEGATE"
-        )]
-        delegate: String,
+        /// Agent delegate `uuid:rig:provider/model`. Omit for human-only ingests.
+        #[arg(long, env = "SLUG_DELEGATE", value_name = "DELEGATE")]
+        delegate: Option<String>,
         /// Output as JSON for agent parsing
         #[arg(long)]
         json: bool,
@@ -193,10 +181,10 @@ enum Command {
     /// Useful for agents to catch up on activity after a context reset.
     ///
     /// Examples:
-    ///   npx slugsocial feed @<uuid>:<rig>:<model>
-    ///   npx slugsocial feed @<uuid>:<rig>:<model> --since 2026-01-01
+    ///   npx slugsocial feed tommy
+    ///   npx slugsocial feed tommy --since 2026-01-01
     Feed {
-        /// Actor identifier (@uuid:rig:model)
+        /// Principal username (stored form)
         #[arg(value_name = "ACTOR")]
         actor: String,
         /// Override the lower bound. Accepts Unix ms or YYYY-MM-DD.
@@ -455,7 +443,7 @@ fn print_rank_history_response(resp: &slug_types::RankHistoryResponse) {
             label,
         );
         for v in &e.caused_by {
-            println!("    {} {} {} {}", v.a, v.ratio, v.b, v.actor.as_deref().map(|a| format!("  (@{})", a)).unwrap_or_default());
+            println!("    {} {} {} {}", v.a, v.ratio, v.b, v.actor.as_deref().map(|a| format!("  ({})", a)).unwrap_or_default());
             if !v.body.is_empty() {
                 println!("      {}", v.body.lines().next().unwrap_or(&v.body).trim());
             }
@@ -1116,7 +1104,7 @@ async fn main() -> Result<()> {
             IdentityCmd::Start { rig, model, json } => {
                 let client = http_client()?;
                 let uuid = uuid::Uuid::new_v4().to_string();
-                let delegate = format!("@@{}:{}:{}", uuid, rig, model);
+                let delegate = format!("{uuid}:{rig}:{model}");
 
                 let start: PendingSessionStartResponse = expect_json(
                     client
diff --git a/server/src/api/auth.rs b/server/src/api/auth.rs
index cb0faa29b834931e2c2b2f5c174c875e2e2e9346..995ce4a61d29b024c399c656134f541ecfd880cf 100644
--- a/server/src/api/auth.rs
+++ b/server/src/api/auth.rs
@@ -12,10 +12,8 @@ use tokio::sync::RwLock;
 
 use crate::{
     api::helpers::{api_error, now_ms, sha256_hex},
-    events::{
-        canonicalize_username, validate_agent_format, validate_username,
-        Event, TokenIssued, UserRegistered,
-    },
+    events::{Event, TokenIssued, UserRegistered},
+    identity::{parse_agent, parse_username},
     html::{auth_complete_page, auth_signed_in_fragment, choose_username_error_fragment, choose_username_page},
     state::{AppState, PendingSession},
 };
@@ -77,9 +75,9 @@ fn verify_token(reduced: &crate::reducer::ReducerState, bearer: &str) -> Result<
     Ok(username)
 }
 
-fn issue_token_for_user(username: &str) -> (String, TokenIssued, String) {
-    // Returns: (bearer, event, canonical_username)
-    let canonical_user = canonicalize_username(username);
+/// `stored_username` must already be in persisted shape (lowercase slug, no `@`).
+fn issue_token_for_user(stored_username: &str) -> (String, TokenIssued) {
+    let username = stored_username.to_string();
     let token_id = {
         let mut id = String::new();
         let alphabet = b"abcdefghijklmnopqrstuvwxyz0123456789";
@@ -103,13 +101,13 @@ fn issue_token_for_user(username: &str) -> (String, TokenIssued, String) {
     let bearer = format!("slug_{token_id}_{secret}");
     let event = TokenIssued {
         ts: now_ms(),
-        username: canonical_user.clone(),
+        username: username.clone(),
         token_id,
         token_hash,
         salt,
         issued_via: "oauth".to_string(),
     };
-    (bearer, event, canonical_user)
+    (bearer, event)
 }
 
 #[derive(Debug, Deserialize)]
@@ -207,7 +205,7 @@ pub async fn get_auth_callback(Query(q): Query<AuthCallbackQuery>, State(state):
         s.provider = Some("google".to_string());
         s.provider_id = Some(sub.clone());
         if let Some(username) = existing {
-            let (bearer, token_event, canon_user) = issue_token_for_user(&username);
+            let (bearer, token_event) = issue_token_for_user(&username);
             // append token event
             let ev = Event::TokenIssued(token_event);
             if let Err(err) = state.event_log.append(&ev).await {
@@ -217,7 +215,7 @@ pub async fn get_auth_callback(Query(q): Query<AuthCallbackQuery>, State(state):
                 let mut reduced = reduced_arc.write().await;
                 reduced.apply_event(ev);
             }
-            s.complete = Some((canon_user, bearer));
+            s.complete = Some((username, bearer));
             return Redirect::temporary(&format!("{public_url}/auth/complete")).into_response();
         }
     }
@@ -251,9 +249,10 @@ pub async fn post_choose_username(
     State(state): State<AppState>,
     Form(form): Form<ChooseUsernameForm>,
 ) -> impl IntoResponse {
-    if let Err(msg) = validate_username(&form.username) {
-        return api_error(StatusCode::BAD_REQUEST, "invalid username", Some(msg)).into_response();
-    }
+    let canon_user = match parse_username(&form.username) {
+        Ok(u) => u,
+        Err(msg) => return api_error(StatusCode::BAD_REQUEST, "invalid username", Some(msg)).into_response(),
+    };
 
     let sessions = pending_sessions(&state);
     let (provider, provider_id, agent) = {
@@ -270,7 +269,7 @@ pub async fn post_choose_username(
         (provider, provider_id, s.agent.clone())
     };
 
-    if let Err(msg) = validate_agent_format(&agent) {
+    if let Err(msg) = parse_agent(&agent) {
         return api_error(StatusCode::BAD_REQUEST, "invalid agent format", Some(msg)).into_response();
     }
 
@@ -280,7 +279,7 @@ pub async fn post_choose_username(
     if reduced.users_by_provider.contains_key(&provider_key) {
         return api_error(StatusCode::CONFLICT, "provider already registered", None).into_response();
     }
-    if reduced.users_by_provider.values().any(|u| u == &canonicalize_username(&form.username)) {
+    if reduced.users_by_provider.values().any(|u| u == &canon_user) {
         drop(reduced);
         return choose_username_error_fragment(&form.session, "that username is taken — try another").into_response();
     }
@@ -288,12 +287,12 @@ pub async fn post_choose_username(
 
     let ur = Event::UserRegistered(UserRegistered {
         ts: now_ms(),
-        username: canonicalize_username(&form.username),
+        username: canon_user.clone(),
         provider: provider.to_lowercase(),
         provider_id: provider_id.clone(),
     });
 
-    let (bearer, ti, canon_user) = issue_token_for_user(&form.username);
+    let (bearer, ti) = issue_token_for_user(&canon_user);
     let ti_ev = Event::TokenIssued(ti);
 
     // Persist events.
@@ -325,15 +324,18 @@ pub async fn post_pending_session(
     State(state): State<AppState>,
     Json(req): Json<PendingSessionStartRequest>,
 ) -> impl IntoResponse {
-    if let Err(msg) = validate_agent_format(&req.agent) {
-        return api_error(StatusCode::BAD_REQUEST, "invalid agent format", Some(msg)).into_response();
-    }
+    let agent_naked = match parse_agent(&req.agent) {
+        Ok(a) => a,
+        Err(msg) => {
+            return api_error(StatusCode::BAD_REQUEST, "invalid agent format", Some(msg)).into_response();
+        }
+    };
     let session = format!("p_{}", uuid::Uuid::new_v4().simple());
     let public_url = std::env::var("SLUG_PUBLIC_URL").unwrap_or_else(|_| "http://127.0.0.1:8080".to_string());
     let login_url = format!("{public_url}/auth/login?session={}", urlencoding::encode(&session));
     let poll_url = format!("/api/v0/pending-session/{}", session);
     let s = PendingSession {
-        agent: req.agent.clone(),
+        agent: agent_naked,
         created_ts: now_ms(),
         provider: None,
         provider_id: None,
@@ -359,7 +361,7 @@ pub async fn get_pending_session(
         return api_error(StatusCode::NOT_FOUND, "unknown session", None).into_response();
     };
     let (complete, user, token) = match &s.complete {
-        Some((u, t)) => (true, Some(format!("@{}", u)), Some(t.clone())),
+        Some((u, t)) => (true, Some(u.clone()), Some(t.clone())),
         None => (false, None, None),
     };
     Json(PendingSessionPollResponse {
@@ -388,7 +390,7 @@ pub async fn get_whoami(State(state): State<AppState>, headers: HeaderMap) 

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