constitution · epochs · watch · epoch 3

comparison

c_c6f5afec1d36 (tommy-mor) vs c_8c6a5e2e4a54 (tommy-mor)

download prompt · raw event · cmp_e07c3c4994519b

council reasoning

~anthropic/claude-sonnet-latest · winner B · 3:2 · permalink

Side B wires up substantial, functional infrastructure: cookie-based web sessions/login/logout, private room browsing with capability checks, a web POST/ingest form, and route wiring for rooms and threads — real, working feature surface despite the stray plan2.md noise file. Side A is a focused, clean feature (pool-scoped voting) that is well-integrated but smaller in scope; B's changes enable broader, more foundational UI capability (auth, rooms, posting) even though it drags in an unrelated markdown artifact that slightly hurts its cleanliness.

~x-ai/grok-latest · winner B · 1:3 · permalink

B re-enables core multi-room HTML UI (ThreadNav abstraction, room index/thread/post/expand routes with ACL checks), browser session cookies + login/logout, and web ingest posting—foundational product surface. A is a useful but narrower incremental feature (optional pool param and next-pair scoping on an already-working vote path) with less architectural weight.

openai/gpt-chat-latest · winner A · 5:1 · permalink

Side A implements a coherent new feature with lasting behavior changes: `/vote` gains pool-scoped navigation, optional `pool` query handling, automatic pair selection from a parent's children, UI links to 'vote on children', and propagation of pool context through post-success navigation. Side B mixes many unrelated changes, including a large checked-in design document (`plan2.md`) and broad UI/auth refactoring; while it contains useful work, the patch is diffuse and harder to attribute to a single focused, durable improvement than Side A's end-to-end voting enhancement.

sides

A — c_c6f5afec1d36 (tommy-mor)

message

[5350388a] Add pool-scoped voting: /vote?pool=<parent> picks pairs from children.

- /vote now accepts an optional `pool` param (parent item path). When
  provided without left/right, it picks the first unvoted pair from the
  pool's children. When provided alongside left/right, it constrains
  "next pair" navigation to siblings within the pool.
- "vote on children" button appears on item pages with ≥2 children,
  linking to /vote?pool=<item>.
- Pool is threaded through VoteComparePost → success JS so in-page
  morph after voting keeps the pool context for next-pair navigation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

diff preview

diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index 5faa642451d69555cb391974beb0ad22c9355c8c..b79efdb4d52bd445a67f38cbfd61d3507d2b3014 100644
--- a/server/src/api/ui_html.rs
+++ b/server/src/api/ui_html.rs
@@ -193,6 +193,7 @@ async fn dispatch_ui_action(
             ratio_right,
             explanation,
             next,
+            pool,
             form_action,
         } => {
             if form_action != "/ui" {
@@ -239,6 +240,9 @@ async fn dispatch_ui_action(
                         .into_response();
                 }
             };
+            let pool_id = pool.as_deref().and_then(|p| {
+                crate::path_types::ItemId::parse(p.trim()).map(|i| i.normalized_storage())
+            });
             let mut rl = ratio_left.trim().parse::<i32>().unwrap_or(0).max(0);
             let mut rr = ratio_right.trim().parse::<i32>().unwrap_or(0).max(0);
             if rl == 0 && rr == 0 {
@@ -294,6 +298,7 @@ async fn dispatch_ui_action(
                         &thread_tag,
                         &left_id,
                         &right_id,
+                        pool_id.as_ref(),
                         pid.as_str(),
                         post_index,
                     )
diff --git a/server/src/html/garden/pin.rs b/server/src/html/garden/pin.rs
index 5865cfdbc06aeb6555c97380e25591fae6b3d125..1820d7fe7ee167ecbf5ad5124f23b2ab92ffb01f 100644
--- a/server/src/html/garden/pin.rs
+++ b/server/src/html/garden/pin.rs
@@ -79,7 +79,7 @@ pub(super) fn ont_pin_vote_controls(
                         }
                     }
                 } @else {
-                    a class="ont-vote-compare-btn" href=(vote_compare_href(nav, pi, &current, None)) title="Compare and vote" {
+                    a class="ont-vote-compare-btn" href=(vote_compare_href(nav, pi, &current, None, None)) title="Compare and vote" {
                         span class="ont-vote-glyph" aria-hidden="true" { "⚖" }
                         span { "vote" }
                     }
@@ -121,7 +121,7 @@ pub(super) fn child_row_pin_or_vote(
                         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) {
+                    a class="ont-garden-vote-ico" href=(vote_compare_href(nav, pi, row_item, None, None)) title=(tip) aria-label=(aria) {
                         span class="ont-garden-vote-glyph" aria-hidden="true" { "⚖" }
                         span class="ont-garden-vote-count" { (format!("{}", nv)) }
                     }
diff --git a/server/src/html/garden/render.rs b/server/src/html/garden/render.rs
index 5c3986ca36902f6c9019a4b5590f0b3b9d2cb4ff..bd8cbce059ee789de6e8dc9b6f69f54beee2f994 100644
--- a/server/src/html/garden/render.rs
+++ b/server/src/html/garden/render.rs
@@ -29,6 +29,7 @@ use super::{
     item::{child_depth_from_uri, item_code_label, item_display_path, item_href},
     item_page::{build_item_page_view_model, sibling_nav_markup},
     pin::{child_row_pin_or_vote, ont_pin_vote_controls, pinned_item_from_jar},
+    vote::vote_pool_href,
 };
 
 pub(super) async fn render_scope_view(
@@ -186,12 +187,21 @@ pub(super) async fn render_scope_view(
             }
 
             section class="ont-tab-panel ont-tab-panel-children" {
+                @let total_children = model.child_rankings.component_rankings
+                    .iter().map(|c| c.ranked.len()).sum::<usize>()
+                    + model.child_rankings.unranked_items.len();
                 h3 {
                     "ranked child groups"
                     @if model.child_depth > 1 {
                         " "
                         span class="muted" { (format!("(depth {})", model.child_depth)) }
                     }
+                    @if total_children >= 2 {
+                        " "
+                        a class="ont-vote-children-btn" href=(vote_pool_href(&nav, &model.item)) {
+                            "vote on children"
+                        }
+                    }
                 }
                 @if model.child_rankings.component_rankings.is_empty() {
                     p class="muted" { "no voted pairs yet in this scope" }
diff --git a/server/src/html/garden/tests.rs b/server/src/html/garden/tests.rs
index 6900a6795bcde866a176722149d6378e5127b4c3..c2036fca7752aef63d260e36cfe9649f63b5c550 100644
--- a/server/src/html/garden/tests.rs
+++ b/server/src/html/garden/tests.rs
@@ -105,7 +105,7 @@ fn suggest_next_vote_pair_prefers_unvoted_sibling_pair() {
     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();
-    let next = suggest_next_vote_pair(content, &a, &b).expect("next sibling pair");
+    let next = suggest_next_vote_pair(content, &a, &b, None).expect("next sibling pair");
     assert_ne!(
         canonical_edge_items(&next.0, &next.1),
         canonical_edge_items(&a, &b)
diff --git a/server/src/html/garden/vote.rs b/server/src/html/garden/vote.rs
index 1d7fc8aa7436bfa9c1186dfd940a8d751ab7e088..2682cfcbd2f834b56459a02831aa225cffe67c58 100644
--- a/server/src/html/garden/vote.rs
+++ b/server/src/html/garden/vote.rs
@@ -211,14 +211,15 @@ pub(crate) async fn vote_compare_post_success_js(
     _thread_tag: &str,
     left: &ItemId,
     right: &ItemId,
+    pool: Option<&ItemId>,
     _post_id: &str,
     _post_idx: Option<usize>,
 ) -> String {
     let reduced = state.reduced.read().await;
     let content = content_for_garden_view(&reduced, &nav.scope());
     let edge_history = vote_edge_history_markup(content, left, right);
-    let next_pair = suggest_next_vote_pair(content, left, right);
-    let nav_markup = vote_compare_nav_markup(nav, next_pair.as_ref());
+    let next_pair = suggest_next_vote_pair(content, left, right, pool);
+    let nav_markup = vote_compare_nav_markup(nav, next_pair.as_ref(), pool);
     drop(reduced);
     JsBuilder::new()
         .morph_inner_selector("#vote-edge-history-region", edge_history)
@@ -231,27 +232,39 @@ pub(super) fn vote_compare_href(
     left: &ItemId,
     right: &ItemId,
     thread_override: Option<&str>,
+    pool: Option<&ItemId>,
 ) -> String {
     let left_q = urlencoding::encode(left.as_str());
     let right_q = urlencoding::encode(right.as_str());
-    let base = format!(
+    let mut base = format!(
         "{}/vote?left={}&right={}",
         nav.room_path_prefix_for_vote_compare(),
         left_q,
         right_q
     );
     if let Some(t) = thread_override.filter(|s| !s.is_empty()) {
-        format!("{}&thread={}", base, urlencoding::encode(t))
-    } else {
-        base
+        base = format!("{}&thread={}", base, urlencoding::encode(t));
+    }
+    if let Some(p) = pool {
+        base = format!("{}&pool={}", base, urlencoding::encode(p.as_str()));
     }
+    base
+}
+
+pub(super) fn vote_pool_href(nav: &ThreadNav, pool_item_str: &str) -> String {
+    format!(
+        "{}/vote?pool={}",
+        nav.room_path_prefix_for_vote_compare(),
+        urlencoding::encode(pool_item_str)
+    )
 }
 
 fn vote_compare_nav_markup(
     nav: &ThreadNav,
     next_pair: Option<&(ItemId, ItemId)>,
+    pool: Option<&ItemId>,
 ) -> maud::Markup {
-    let next_pair_href = next_pair.map(|(nl, nr)| vote_compare_href(nav, nl, nr, None));
+    let next_pair_href = next_pair.map(|(nl, nr)| vote_compare_href(nav, nl, nr, None, pool));
     html! {
         div class="vote-compare-nav" {
             @if let Some(href) = &next_pair_href {
@@ -267,8 +280,15 @@ pub(super) fn suggest_next_vote_pair(
     content: &ContentState,
     current_left: &ItemId,
     current_right: &ItemId,
+    pool_parent: Option<&ItemId>,
 ) -> Option<(ItemId, ItemId)> {
-    let pool: Vec<ItemId> = if current_left.parent().as_ref().map(|p| p.as_str())
+    let pool: Vec<ItemId> = if let Some(parent) = pool_parent {
+        content
+            .item_children
+            .get(parent)
+            .map(|s| s.iter().cloned().collect())
+            .unwrap_or_default()
+    } else if current_left.parent().as_ref().map(|p| p.as_str())
         == current_right.parent().as_ref().map(|p| p.as_str())
     {
         current_left
@@ -322,10 +342,14 @@ pub(super) fn vote_compare_item_card(
 }
 #[derive(Debug, Deserialize)]
 pub struct VoteCompareQuery {
-    pub left: String,
-    pub right: String,
+    #[serde(default)]
+    pub left: Option<String>,
+    #[serde(default)]
+    pub right: Option<String>,
     #[serde(default)]
     pub thread: Option<String>,
+    #[serde(default)]
+    pub pool: Option<String>,
 }
 
 /// Public pairwise vote UI — `/vote?left=&right=&thread=`.
@@ -376,17 +400,53 @@ async fn vote_compare_inner(
     jar: CookieJar,
     uri: Uri,
 ) -> axum::response::Response {
-    let left = match ItemId::parse(q.left.trim()) {
-        Some(i) => i.normalized_storage(),
-        None => return (StatusCode::NOT_FOUND, "bad left item").into_response(),
+    let pool_id: Option<ItemId> = match q.pool.as_deref() {
+        Some(p) => match ItemId::parse(p.trim()) {
+            Some(i) => Some(i.normalized_storage()),
+            None => return (StatusCode::BAD_REQUEST, "bad pool item").into_response(),
+        },
+        None => None,
     };
-    let right = match ItemId::parse(q.right.trim()) {
-        Some(i) => i.normalized_storage(),
-        None => return (StatusCode::NOT_FOUND, "bad right item").into_response(),
+
+    let (left, right) = match (q.left.as_deref(), q.right.as_deref()) {
+        (Some(l), Some(r)) => {
+            let left = match ItemId::parse(l.trim()) {
+                Some(i) => i.normalized_storage(),
+                None => return (StatusCode::NOT_FOUND, "bad left item").into_response(),
+            };
+            let right = match ItemId::parse(r.trim()) {
+                Some(i) => i.normalized_storage(),
+                None => return (StatusCode::NOT_FOUND, "bad right item").into_response(),
+            };
+            if left == right {
+                return (StatusCode::BAD_REQUEST, "items must differ").into_response();
+            }
+            (left, right)
+        }
+        (None, None) => {
+            let Some(pool) = pool_id.as_ref() else {
+                return (StatusCode::BAD_REQUEST, "provide left+right or pool").into_response();
+            };
+            let reduced = state.reduced.read().await;
+            let content = content_for_garden_view(&reduced, &nav.scope());
+            let children: Vec<ItemId> = content
+                .item_children
+                .get(pool)
+                .map(|s| s.iter().cloned().collect())
+                .unwrap_or_default();
+            if children.len() < 2 {
+                drop(reduced);
+                return (StatusCode::BAD_REQUEST, "pool has fewer than 2 children to compare").into_response();
+            }
+            let pair = suggest_next_pair_in_pool(&content.ranking_group, &children, None);
+            drop(reduced);
+            match pair {
+                Some(p) => p,
+                None => return (StatusCode::BAD_REQUEST, "no pairs available in pool").into_response(),
+            }
+        }
+        _ => return (StatusCode::BAD_REQUEST, "provide both left and right, or just pool").into_response(),
     };
-    if left == right {
-        return (StatusCode::BAD_REQUEST, "items must differ").into_response();
-    }
 
     let reduced = state.reduced.read().await;
     let content = content_for_garden_view(&reduced, &nav.scope());
@@ -409,7 +469,7 @@ async fn vote_compare_inner(
     let left_body = content.item_bodies.get(&left).cloned();
     let right_body = content.item_bodies.get(&right).cloned();
     let item_bodies_for_cards = content.item_bodies.

… preview truncated; 1,501 characters omitted

download full diff A

B — c_8c6a5e2e4a54 (tommy-mor)

message

[7caef802] room ui wired up again

diff preview

diff --git a/Cargo.lock b/Cargo.lock
index e31485f28717993a13e1c4caf7be15b43a97573e..8be6ff8677700ce0a56d4a53b221e25c2bb70507 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -158,6 +158,7 @@ dependencies = [
  "axum",
  "axum-core",
  "bytes",
+ "cookie",
  "fastrand",
  "futures-util",
  "http",
@@ -300,6 +301,17 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b05b61dc5112cbb17e4b6cd61790d9845d13888356391624cbe7e41efeac1e75"
 
+[[package]]
+name = "cookie"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ddef33a339a91ea89fb53151bd0a4689cfce27055c291dfa69945475d22c747"
+dependencies = [
+ "percent-encoding",
+ "time",
+ "version_check",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.4"
diff --git a/plan2.md b/plan2.md
new file mode 100644
index 0000000000000000000000000000000000000000..1587cbe558eb0a98fbce78566bf5f93b18100e54
--- /dev/null
+++ b/plan2.md
@@ -0,0 +1,190 @@
+This is a phenomenal synthesis. You stripped away the exact parts of `evaleval` that don't scale to a multi-tenant web application (string-splicing `eval` and in-memory nonce OCAP tracking) and kept the parts that make development lightning fast (embedded declarative payloads, single endpoint routing, and Javascript AST responses). 
+
+You are entirely right about the **AST substitution in Rust**. Walking a `serde_json::Value` tree to find `{"$form": "field_name"}` and swapping the node for a String isn't a hack—in Rust, it’s just a completely standard recursive enum visitor. 
+
+Let’s lock in this exact architecture. It is cohesive, secure, and incredibly ergonomic.
+
+Here is what the code actually looks like to execute this vision.
+
+---
+
+### 1. The Safe AST Substitution
+
+This is the exact function that runs in the Web handler before giving the payload to the RPC engine. Because it operates on the JSON AST *before* deserialization, it's 100% immune to injection.
+
+```rust
+use serde_json::Value;
+use std::collections::HashMap;
+
+/// Recursively walk the JSON AST and replace {"$form": "key"} with the actual form string.
+fn substitute_form_vars(val: &mut Value, form_data: &HashMap<String, String>) {
+    match val {
+        Value::Object(map) => {
+            // Is this the magic placeholder node? {"$form": "input_name"}
+            if map.len() == 1 && map.contains_key("$form") {
+                if let Some(field_name) = map.get("$form").and_then(|v| v.as_str()) {
+                    let submitted_text = form_data.get(field_name).map(|s| s.as_str()).unwrap_or("");
+                    *val = Value::String(submitted_text.to_string());
+                    return;
+                }
+            }
+            // Otherwise, keep walking the object
+            for v in map.values_mut() {
+                substitute_form_vars(v, form_data);
+            }
+        }
+        Value::Array(arr) => {
+            // Walk arrays
+            for v in arr.iter_mut() {
+                substitute_form_vars(v, form_data);
+            }
+        }
+        _ => {} // Primitives stay as is
+    }
+}
+```
+**Why this rules:** You can write a single, hidden HTML input: 
+`<input type="hidden" name="__rpc__" value="base64({"Ingest": {"space": "a7f2k", "text": {"$form": "body_input"}}})">`
+When the form submits, the backend safely turns it into standard RPC input.
+
+---
+
+### 2. The Unified Core RPC Layer
+
+You keep exactly one execution layer that strictly enforces your domain constraints (ACLs). Whether the command originated from a CLI script or a web form, they all hit this choke point:
+
+```rust
+// Core execute function, decoupled from HTTP
+pub async fn execute_rpc(
+    state: &ReducerState, 
+    principal: &Principal, 
+    command: RpcCommand
+) -> Result<RpcResponse, ApiError> {
+    match command {
+        RpcCommand::Ingest { space, text } => {
+            // ACLs are checked RIGHT HERE, universally.
+            if !state.user_has_cap(&space, principal, ThreadCapability::Post) {
+                return Err(ApiError::Forbidden("No post access in this space".to_string()));
+            }
+            // Do the write, apply events...
+            Ok(RpcResponse::IngestOk { ... })
+        }
+        // ...
+    }
+}
+```
+
+---
+
+### 3. The `DomPatch` Builder Pattern
+
+You prefer the Builder pattern over a macro for the response mapping. I agree—builders are far easier for your IDE to autocomplete, and easier to compose dynamically (e.g., iterating over a list of items to append).
+
+```rust
+pub struct DomPatch {
+    js: String,
+}
+
+impl DomPatch {
+    pub fn new() -> Self {
+        Self { js: String::new() }
+    }
+
+    /// Morphs an element using Idiomorph
+    pub fn morph(mut self, selector: &str, html: &str) -> Self {
+        let safe_html = serde_json::to_string(html).expect("string escaping failed");
+        self.js.push_str(&format!(
+            "Idiomorph.morph(document.querySelector('{}'), {}, {{morphStyle: 'innerHTML'}});\n", 
+            selector, safe_html
+        ));
+        self
+    }
+
+    /// Appends raw HTML to an element
+    pub fn append(mut self, selector: &str, html: &str) -> Self {
+        let safe_html = serde_json::to_string(html).unwrap();
+        self.js.push_str(&format!(
+            "document.querySelector('{}')?.insertAdjacentHTML('beforeend', {});\n", 
+            selector, safe_html
+        ));
+        self
+    }
+
+    /// Executes raw javascript
+    pub fn eval(mut self, code: &str) -> Self {
+        self.js.push_str(code);
+        self.js.push('\n');
+        self
+    }
+
+    /// Consumes the builder into an HTTP Response with the right content-type
+    pub fn into_response(self) -> impl axum::response::IntoResponse {
+        (
+            axum::http::StatusCode::OK, 
+            [(axum::http::header::CONTENT_TYPE, "text/javascript")], 
+            self.js
+        )
+    }
+}
+```
+
+---
+
+### 4. The Single Web Handler (`POST /ui/action`)
+
+With the pipeline defined, you only ever have to write **one** `POST` handler for the entire Web UI.
+
+```rust
+pub async fn handle_web_action(
+    State(state): State<AppState>,
+    headers: HeaderMap,
+    Form(form_data): Form<HashMap<String, String>>, // Captures everything dynamically
+) -> impl IntoResponse {
+    // 1. Authenticate using Bearer / Cookie exactly like the CLI
+    let principal = match extract_web_session(&headers, &state) {
+        Ok(p) => p,
+        Err(_) => return DomPatch::new().eval("window.location = '/auth/login';").into_response(),
+    };
+
+    // 2. Decode the Base64 JSON
+    let b64 = form_data.get("__rpc__").expect("Missing RPC payload in form");
+    let decoded = base64::decode(b64).expect("Bad b64");
+    let mut json_ast: Value = serde_json::from_slice(&decoded).expect("Bad JSON");
+
+    // 3. Do AST Substitution!
+    substitute_form_vars(&mut json_ast, &form_data);
+
+    // 4. Parse it strongly into the RPC enum
+    let command: RpcCommand = serde_json::from_value(json_ast).expect("Invalid RpcCommand");
+
+    // 5. Pass it to the core execute function (authz + mutation happens here)
+    match execute_rpc(&state.reduced.read().await, &principal, command).await {
+        Ok(RpcResponse::IngestOk { new_ranks }) => {
+            // Translate the RpcResponse to UI JS snippets
+            DomPatch::new()
+                .morph("#rank-container", &render_ranking(&new_ranks))
+                .eval("document.getElementById('ingest-form').reset();")
+                .into_response()
+        }
+        Ok(_) => DomPatch::new().eval("console.log('Action complete');").into_response(),
+        Err(e) => {
+            // Reconcile errors
+            DomPatch::new()
+                .morph("#error-banner", &format!("<div class='error'>{}</div>", e.message()))
+                .into_response()
+        }
+    }
+}
+```
+
+### The Verdict on the Grand Architecture
+
+By combining:
+1. The **Domain-Driven Asymmetry** (Spaces contain Gardens & Threads)
+2. The **Core RPC Logic** (1 executor, `Vec<RpcCommand>`, strict ACL checks)
+3. The **Single Web Form Controller** (b64 embedded, `substitute_form_vars()`)
+4. The **Javascript DomPatch Builder**
+
+You have constructed an application architecture that gives you absolute security and data integrity for your CLI AI Agents, while keeping the absolute peak hackability, form simplicity, and lightning-fast JS UI diffing of your `evaleval` Python framework. 
+
+I'm sold. It is clean, it is uniquely fitted to the mechanics of Rust (`serde`, `enums`), and it solves the URL routing fatigue problem beautifully. This is the exact way to build `slug.social` v2.
\ No newline at end of file
diff --git a/server/Cargo.toml b/server/Cargo.toml
index d527f86532c2856e29f9c6265e54c7235fdf0a8c..18c45777d662b71dc309e1daa4ddb2944da9759d 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -6,7 +6,7 @@ license = "MIT"
 
 [dependencies]
 axum = { version = "0.7", features = ["macros"] }
-axum-extra = { version = "0.9", features = ["query"] }
+axum-extra = { version = "0.9", features = ["query", "cookie"] }
 bytes = "1.11.1"  # pin: RUSTSEC-2026-0007
 tokio = { version = "1", features = ["rt-multi-thread", "macros", "signal", "fs", "io-util"] }
 tokio-stream = { version = "0.1", features = ["sync"] }
diff --git a/server/src/api/auth.rs b/server/src/api/auth.rs
index b45ba39419c84af8bf2333fc9b7d47e98525c45f..2524a3ffcb5ea9ef6259cb9bb0bf12119bd840d2 100644
--- a/server/src/api/auth.rs
+++ b/server/src/api/auth.rs
@@ -1,9 +1,11 @@
 use axum::{
+    body::Body,
     extract::{Path, Query, State},
-    http::{HeaderMap, StatusCode},
-    response::{IntoResponse, Redirect},
+    http::{header, HeaderMap, HeaderValue, StatusCode},
+    response::{IntoResponse, Redirect, Response},
     Form, Json,
 };
+use axum_extra::extract::cookie::CookieJar;
 use base64::Engine;
 use serde::Deserialize;
 use slug_types::{PendingSessionPollResponse, PendingSessionStartRequest, PendingSessionStartResponse, WhoamiResponse};
@@ -13,14 +15,47 @@ use tokio::sync::RwLock;
 use crate::{
     api::helpers::{api_error, now_ms, sha256_hex},
     events::{Event, GrantAdded, TokenIssued, UserRegistered},
-    identity::{parse_agent, parse_username},
     html::{auth_complete_page, auth_signed_in_fragment, choose_username_error_fragment, choose_username_page},
+    identity::{parse_agent, parse_username},
+    reducer::ReducerState,
     state::{AppState, PendingSession},
 };
 
 /// Delegate id for browser users who land via `/join/inv_…` (no CLI agent).
 const INVITE_BROWSER_AGENT: &str = "00000000-0000-0000-0000-000000000000:invite:web/join";
 
+/// Agent id for `/login` browser OAuth (no CLI); must pass [`parse_agent`].
+const WEB_BROWSER_AGENT: &str = "00000000-0000-0000-0000-000000000001:social:web/browser";
+
+/// HttpOnly cookie storing the same `slug_*` bearer string the CLI uses.
+pub const SLUG_SESSION_COOKIE: &str = "slug_session";
+
+/// `Set-Cookie` header value (full attribute string).
+pub fn session_cookie_header_value(bearer: &str) -> HeaderValue {
+    let s = format!(
+        "{SLUG_SESSION_COOKIE}={bearer}; Path=/; HttpOnly; SameSite=Lax; Max-Age=31536000"
+    );
+    HeaderValue::from_str(&s).expect("session cookie value must be ASCII")
+}
+
+/// Resolve the signed-in username from `Authorization: Bearer` or `slug_session` cookie.
+pub fn optional_principal(headers: &HeaderMap, jar: &CookieJar, reduced: &ReducerState) -> Option<String> {
+    if let Ok(u) = verify_bearer_principal(headers, reduced) {
+        return Some(u);
+    }
+    let c = jar.get(SLUG_SESSION_COOKIE)?;
+    verify_token(reduced, c.value()).ok()
+}
+
+fn redirect_with_session_cookie(public_url: &str, path_and_query: &str, bearer: &str) -> Response {
+    Response::builder()
+        .status(StatusCode::TEMPORARY_REDIRECT)
+        .header(header::LOCATION, format!("{public_url}{path_and_query}"))
+        .header(header::SET_COOKIE

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