constitution · epochs · watch · epoch 3

comparison

c_2722a3195825 (tommy-mor) vs c_e2ee16c7ada5 (tommy-mor)

download prompt · raw event · cmp_ed8b4a4a9803c6

council reasoning

~anthropic/claude-sonnet-latest · winner B · 62:38 · permalink

Side B is a substantial, correct architectural refactor (separating canonical_path/identity concerns, making delegate optional, standardizing wire identity to strip @ ambiguity) that touches many call sites consistently and is validated by updated integration tests, providing lasting clarity to a previously conflated events module. Side A is a well-tested but narrower heuristic tweak to pair-selection sub-priorities in one file, useful but of smaller architectural scope and impact than B's identity/API correctness overhaul.

~x-ai/grok-latest · winner A · 2:1 · permalink

A adds real pairing logic (established-component bridges before isolate–isolate, then rank-adjacent zip once connected) plus targeted tests in pair.rs, improving core ranking behavior. B mostly splits/moves canonicalize helpers, strips @ from wire/storage, and propagates optional naked delegates across many call sites—valuable API hygiene, but more contract/refactor churn than new lasting capability.

openai/gpt-chat-latest · winner B · 3:2 · permalink

Side B makes a broad architectural improvement by separating canonical path handling from identity parsing, introducing dedicated `canonical_path.rs` and `identity.rs`, removing identity rewriting from the reducer, enforcing strict stored-form identities without `@` at API boundaries, and updating APIs, HTML, types, and tests consistently. Side A meaningfully improves pair selection with new bridge and rank-refinement heuristics plus targeted tests, but its impact is confined to one algorithm, whereas Side B establishes cleaner long-term boundaries and data handling across the project.

sides

A — c_2722a3195825 (tommy-mor)

message

[5db58b98] Improve vote pair selection for spanning trees and rank refinement.

Prefer attaching unranked items to established components before comparing
isolates, then zip down adjacent rank-centrality pairs once the pool is fully
connected, skipping pairs that already have votes.

Co-authored-by: Cursor <cursoragent@cursor.com>

diff preview

diff --git a/server/src/pair.rs b/server/src/pair.rs
index 54b5d2417e9dba04ed8df422156e274c2b2f76b2..c14de4b0502c8b5a17cddf3746077739d56e03e0 100644
--- a/server/src/pair.rs
+++ b/server/src/pair.rs
@@ -3,13 +3,21 @@
 //! Pair selection prefers **bridge** votes — comparisons between items in
 //! different connected components of the voted-pairs graph — so the pool
 //! merges into one ranking group before refining within it.
+//!
+//! Among unvoted bridges, prefer merging established voted components, then
+//! attaching a never-voted child to an established component, and only then
+//! comparing two never-voted children (so the voted graph grows as one tree).
+//!
+//! Once every pool child sits in one voted component, refinement **zips** down
+//! the rank-centrality order: prefer 1 vs 2, then 2 vs 3, and so on, skipping
+//! pairs that already have a vote.
 
 use rand::seq::SliceRandom;
 use std::collections::{HashMap, HashSet};
 
 use crate::{
     path_types::ItemId,
-    ranking::connected_components_from_voted_pairs,
+    ranking::{connected_components_from_voted_pairs, ranked_items},
     reducer::{GlobalTree, GroupState},
 };
 
@@ -28,36 +36,77 @@ fn pair_is_voted(group: &GroupState, a: &ItemId, b: &ItemId) -> bool {
     group.voted_pairs.contains(&(i, j))
 }
 
-/// Component id per pool item: voted-pairs graph components plus one id per
-/// never-voted child.
-fn component_ids(group: &GroupState, pool: &[ItemId]) -> HashMap<ItemId, usize> {
+/// Voted-pairs layout for pool items: component id per item plus which ids are
+/// multi-node voted components (ranked groups in the UI).
+struct ComponentLayout {
+    ids: HashMap<ItemId, usize>,
+    established: HashSet<usize>,
+}
+
+fn component_layout(group: &GroupState, pool: &[ItemId]) -> ComponentLayout {
     let n = group.idx_to_item.len();
     let (comps, isolates) =
         connected_components_from_voted_pairs(n, group.voted_pairs.iter().copied());
 
-    let mut out: HashMap<ItemId, usize> = HashMap::new();
+    let mut established = HashSet::new();
+    let mut ids: HashMap<ItemId, usize> = HashMap::new();
     for (comp_idx, comp) in comps.iter().enumerate() {
+        if comp.len() >= 2 {
+            established.insert(comp_idx);
+        }
         for &idx in comp {
             if idx < n {
-                out.insert(group.idx_to_item[idx].clone(), comp_idx);
+                ids.insert(group.idx_to_item[idx].clone(), comp_idx);
             }
         }
     }
     let mut next = comps.len();
     for &idx in &isolates {
         if idx < n {
-            out.insert(group.idx_to_item[idx].clone(), next);
+            ids.insert(group.idx_to_item[idx].clone(), next);
             next += 1;
         }
     }
     for item in pool {
-        out.entry(item.clone()).or_insert_with(|| {
+        ids.entry(item.clone()).or_insert_with(|| {
             let id = next;
             next += 1;
             id
         });
     }
-    out
+    ComponentLayout { ids, established }
+}
+
+/// Every pool child shares one multi-node voted component (spanning tree phase done).
+fn pool_fully_connected(layout: &ComponentLayout, pool: &[ItemId]) -> bool {
+    if pool.len() < 2 {
+        return false;
+    }
+    let mut comp_id = None;
+    for item in pool {
+        let Some(id) = layout.ids.get(item) else {
+            return false;
+        };
+        if !layout.established.contains(id) {
+            return false;
+        }
+        match comp_id {
+            None => comp_id = Some(*id),
+            Some(expected) if expected == *id => {}
+            _ => return false,
+        }
+    }
+    comp_id.is_some()
+}
+
+/// Pool children that appear in `group`, sorted best rank first.
+fn ranked_pool_order(group: &GroupState, pool: &[ItemId]) -> Vec<ItemId> {
+    let pool_set: HashSet<_> = pool.iter().collect();
+    ranked_items(group)
+        .into_iter()
+        .map(|r| r.item)
+        .filter(|id| pool_set.contains(id))
+        .collect()
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
@@ -72,19 +121,108 @@ enum PairPriority {
     WithinVoted = 3,
 }
 
-fn pair_priority(
+/// Tie-break among unvoted bridge pairs.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+enum BridgeSubPriority {
+    /// Both endpoints lie in established (multi-node) voted components.
+    MergeEstablished = 0,
+    /// One established component member and one never-voted child.
+    AttachIsolate = 1,
+    /// Two never-voted children (separate singleton components).
+    IsolatePair = 2,
+}
+
+/// Tie-break among within-component pairs once the pool is one connected group.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+struct WithinSubPriority {
+    /// 1 = adjacent ranks (i vs i+1); larger = farther apart in the order.
+    rank_gap: usize,
+    /// min rank index of the two — zip from the top (1 vs 2 before 2 vs 3).
+    zip_index: usize,
+}
+
+const WITHIN_SUB_WORST: WithinSubPriority = WithinSubPriority {
+    rank_gap: usize::MAX,
+    zip_index: usize::MAX,
+};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+struct PairSortKey {
+    priority: PairPriority,
+    bridge_sub: BridgeSubPriority,
+    within_sub: WithinSubPriority,
+}
+
+fn item_in_established(layout: &ComponentLayout, item: &ItemId) -> bool {
+    layout
+        .ids
+        .get(item)
+        .is_some_and(|id| layout.established.contains(id))
+}
+
+fn bridge_sub_priority(layout: &ComponentLayout, a: &ItemId, b: &ItemId) -> BridgeSubPriority {
+    let a_est = item_in_established(layout, a);
+    let b_est = item_in_established(layout, b);
+    match (a_est, b_est) {
+        (true, true) => BridgeSubPriority::MergeEstablished,
+        (true, false) | (false, true) => BridgeSubPriority::AttachIsolate,
+        (false, false) => BridgeSubPriority::IsolatePair,
+    }
+}
+
+fn within_sub_priority(
+    group: &GroupState,
+    pool: &[ItemId],
+    layout: &ComponentLayout,
+    a: &ItemId,
+    b: &ItemId,
+) -> WithinSubPriority {
+    if !pool_fully_connected(layout, pool) {
+        return WITHIN_SUB_WORST;
+    }
+    let order = ranked_pool_order(group, pool);
+    let (Some(i), Some(j)) = (order.iter().position(|x| x == a), order.iter().position(|x| x == b))
+    else {
+        return WITHIN_SUB_WORST;
+    };
+    WithinSubPriority {
+        rank_gap: i.abs_diff(j),
+        zip_index: i.min(j),
+    }
+}
+
+fn pair_sort_key(
     group: &GroupState,
-    components: &HashMap<ItemId, usize>,
+    pool: &[ItemId],
+    layout: &ComponentLayout,
     a: &ItemId,
     b: &ItemId,
-) -> PairPriority {
+) -> PairSortKey {
     let voted = pair_is_voted(group, a, b);
-    let bridge = components.get(a) != components.get(b);
-    match (bridge, voted) {
+    let bridge = layout.ids.get(a) != layout.ids.get(b);
+    let priority = match (bridge, voted) {
         (true, false) => PairPriority::BridgeUnvoted,
         (false, false) => PairPriority::WithinUnvoted,
         (true, true) => PairPriority::BridgeVoted,
         (false, true) => PairPriority::WithinVoted,
+    };
+    let bridge_sub = if priority == PairPriority::BridgeUnvoted {
+        bridge_sub_priority(layout, a, b)
+    } else {
+        BridgeSubPriority::MergeEstablished
+    };
+    let within_sub = if matches!(
+        priority,
+        PairPriority::WithinUnvoted | PairPriority::WithinVoted
+    ) {
+        within_sub_priority(group, pool, layout, a, b)
+    } else {
+        WITHIN_SUB_WORST
+    };
+    PairSortKey {
+        priority,
+        bridge_sub,
+        within_sub,
     }
 }
 
@@ -109,9 +247,12 @@ fn candidate_pairs(pool: &[ItemId], exclude: Option<(&ItemId, &ItemId)>) -> Vec<
 
 /// Pick the next pair to vote on within `pool`.
 ///
-/// 1. Prefer unvoted **bridge** pairs (connect separate ranking components).
-/// 2. Then unvoted within-component pairs (refinement).
-/// 3. Then already-voted pairs (re-compare).
+/// 1. Prefer unvoted **bridge** pairs (connect separate ranking components),
+///    with sub-priority: merge established components, attach an isolate to
+///    established, then compare two isolates.
+/// 2. Then unvoted within-component pairs; when the pool is one connected group,
+///    prefer adjacent ranks (1 vs 2, 2 vs 3, …) in order, skipping voted pairs.
+/// 3. Then already-voted pairs (re-compare), with the same zip ordering.
 pub fn suggest_next_pair_in_pool(
     group: &GroupState,
     pool: &[ItemId],
@@ -121,15 +262,15 @@ pub fn suggest_next_pair_in_pool(
     if candidates.is_empty() {
         return None;
     }
-    let components = component_ids(group, pool);
+    let layout = component_layout(group, pool);
     let best = candidates
         .iter()
-        .map(|(a, b)| (pair_priority(group, &components, a, b), (a, b)))
-        .min_by_key(|(p, _)| *p)?
+        .map(|(a, b)| (pair_sort_key(group, pool, &layout, a, b), (a, b)))
+        .min_by_key(|(k, _)| *k)?
         .0;
     let best_pairs: Vec<(ItemId, ItemId)> = candidates
         .into_iter()
-        .filter(|(a, b)| pair_priority(group, &components, a, b) == best)
+        .filter(|(a, b)| pair_sort_key(group, pool, &layout, a, b) == best)
         .collect();
     best_pairs.choose(&mut rand::thread_rng()).cloned()
 }
@@ -303,6 +444,38 @@ mod tests {
         assert!(from_ab && from_cd, "expected bridge pair, got {:?}", chosen);
     }
 
+    #[test]
+    fn suggest_prefers_attach_over_isolate_pair_among_many_unranked() {
+        let parent = ItemId::parse("reddit.com/r/rust").unwrap();
+        let mut tree = seed_children(
+            &parent,
+            &[
+                "reddit.com/r/rust/a",
+                "reddit.com/r/rust/b",
+                "reddit.com/r/rust/c",
+                "reddit.com/r/rust/d",
+                "reddit.com/r/rust/e",
+            ],
+        );
+        let ab =
+            VoteData::from_recorded(1, "reddit.com/r/rust/a", "reddit.com/r/rust/b", 2, 1).unwrap();
+        tree.apply_vote(&parent, ab);
+        let group = tree.get(&parent).unwrap().local_ranking.clone();
+        let pool = children_of(&tree, &parent);
+        let pair = suggest_next_pair_in_pool(&group, &pool, None).unwrap();
+        let chosen = pair_set(&pair);
+        let from_ab =
+            chosen.contains("reddit.com/r/rust/a") || chosen.contains("reddit.com/r/rust/b");
+        let from_cde = chosen.contains("reddit.com/r/rust/c")
+            || chosen.contains("reddit.com/r/rust/d")
+            || chosen.contains("reddit.com/r/rust/e");
+        assert!(
+            from_ab && from_cde,
+            "expected ranked+unranked attach, got {:?}",
+            chosen
+        );
+    }
+
     #[test]
     fn suggest_connects_isolate_to_existing_component() {
         let parent = ItemId::parse("reddit.com/r/rust").unwrap();
@@ -325,6 +498,65 @@ mod tests {
         assert!(chosen.contains("reddit.com/r/rust/a") || chosen.contains("reddit.com/r/rust/b"));
     }
 
+    #[test]
+    fn suggest_zips_adjacent_ranks_when_tree_complete() {
+        let parent = ItemId::parse("reddit.com/r/rust").unwrap();
+        let mut tree = seed_children(
+            &parent,
+            &[
+                "reddit.com/r/rust/a",
+                "reddit.com/r/rust/b",
+                "reddit.com/r/rust/c",
+            ],
+        );
+        // Star at a connects all three; b-c is the only unvoted adjacent pair left.
+        for (a, b, l, r) in [
+            ("reddit.com/r/rust/a", "reddit.com/r/rust/b", 3, 1),
+            ("reddit.com/r/rust/a", "reddit.com/r/rust/c", 2, 1),
+        ] {
+            let v = VoteData::from_recorded(1, a, b, l, r).unwrap();
+            tree.apply_vote(&parent, v);
+        }
+        let group = tree.get(&parent).unwrap().local_ranking.clone();
+        let pool = children_of(&tree, &parent);
+        let pair = suggest_next_pair_in_pool(&group, &pool, None).unwrap();
+        let chosen = pair_set(&pair);
+        // a-b and a-c voted;

… preview truncated; 1,687 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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