In-app agent chat: your own coding agents over ACP, plus OpenAI-compatible endpoints (#1102)

* Agent chat prototype: drive an ACP agent the user already has from a side panel

A desktop-only chat panel (off by default) that starts a coding agent over the
Agent Client Protocol and gives it SolidCraft's MCP server, bridged to the open
window through the token-protected control channel with the default folder
limits. It finds installed agents (Claude Code and Codex adapters, Gemini CLI,
Copilot, Qwen, OpenCode, goose) with version and login state, streams text,
tool calls and plans, shows the agent's permission requests, and when an agent
isn't signed in shows its own login methods without handling any credential.

Design notes and findings: docs/design/in-app-agent-chat.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* docs: say only what the end-to-end run showed

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Agent chat: gate, one undo per message, docking, process groups, discovery polish

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Agent chat: Settings → AI, several agents with a switcher, OpenAI-compatible endpoints, permission modes, toolbar button

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Agent chat: translations, tool cards, Add agent dialog fixes, test agent saves on its own

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Agent chat: third-party licences for the keychain crates; clippy

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Agent chat: badge text from the theme tokens

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Agent chat: Auto-allow model edits is the default permission mode

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/ui-egui/src/toolbar.rs

@@ -650,7 +650,10 @@ pub fn toolbar(app: &mut SolveApp, ui: &mut egui::Ui) {
             if tab == "SKETCH" && panel == "CREATE" { (count.max(1) as f32 * 68.0).max(64.0) + 8.0 } else { panel_width(count) }
         };
         let widths: Vec<f32> = lists.iter().map(|(panel, _, shown)| width_of(panel, shown.len())).collect();
-        let fits = fit(&widths, r.right() - 40.0 - px);
+        // The AI button keeps the toolbar row's right end, whatever the ribbon's width
+        // (docs/agent-chat.md); panels that no longer fit go to the » menu as usual.
+        let right = if crate::agent_chat::toolbar_button_shown(app) { r.right() - AI_BUTTON_ROOM } else { r.right() };
+        let fits = fit(&widths, right - 40.0 - px);
         crate::scenario::publish_count("toolbar_collapsed", fits.iter().filter(|f| **f == Fit::Collapsed).count() as f64);
         crate::scenario::publish_count("toolbar_more", fits.iter().filter(|f| **f == Fit::More).count() as f64);
         for ((panel, cmds, shown), fit) in lists.into_iter().zip(fits) {
@@ -910,7 +913,7 @@ pub fn toolbar(app: &mut SolveApp, ui: &mut egui::Ui) {
             px += 2.0;
         }
         if !overflow.is_empty() {
-            let at = Rect::from_min_size(pos2(px.min(r.right() - 40.0), top + 4.0), vec2(38.0, 52.0));
+            let at = Rect::from_min_size(pos2(px.min(right - 40.0), top + 4.0), vec2(38.0, 52.0));
             ui.scope_builder(egui::UiBuilder::new().max_rect(at), |ui| {
                 let response = ui.menu_button("»", |ui| {
                     for (panel, cmds) in &overflow {
@@ -938,6 +941,9 @@ pub fn toolbar(app: &mut SolveApp, ui: &mut egui::Ui) {
                 response.response.on_hover_text(crate::i18n::tr_label("More toolbar panels"));
             });
         }
+        if right < r.right() {
+            ai_button(app, ui, Rect::from_min_max(pos2(right + 4.0, r.top() + 4.0), pos2(r.right() - 6.0, r.bottom() - 5.0)));
+        }
         painter.line_segment([pos2(r.left(), r.bottom() - 0.5), pos2(r.right(), r.bottom() - 0.5)], Stroke::new(1.0, t.border));
         // Dragging a command: its icon follows the pointer; a toolbar button dragged off the
         // toolbar (or into the open drop-down) shows it will be removed.
@@ -967,6 +973,40 @@ pub fn toolbar(app: &mut SolveApp, ui: &mut egui::Ui) {
     });
 }
 
+/// Room the AI button takes at the toolbar row's right end.
+const AI_BUTTON_ROOM: f32 = 52.0;
+
+/// The AI button: shows and hides the agent chat panel (lit while it is open).
+fn ai_button(app: &mut SolveApp, ui: &mut egui::Ui, at: Rect) {
+    let t = Tokens::get();
+    let resp = ui.interact(at, ui.id().with("ai_button"), Sense::click());
+    crate::scenario::publish_handle("toolbar:ai", at.center());
+    let open = app.agent_chat.open;
+    let painter = ui.painter();
+    painter.line_segment([pos2(at.left() - 4.0, at.top() + 4.0), pos2(at.left() - 4.0, at.bottom() - 4.0)], Stroke::new(1.0, t.border));
+    if open || resp.hovered() {
+        painter.rect_filled(at, 4.0, if open { t.accent_soft } else { t.hover });
+    }
+    icons::paint(
+        painter,
+        Rect::from_center_size(pos2(at.center().x, at.top() + 24.0), vec2(26.0, 26.0)),
+        "agent_chat",
+        t.icon,
+        t.icon_fill,
+        t.accent,
+    );
+    painter.text(pos2(at.center().x, at.top() + 52.0), Align2::CENTER_CENTER, crate::i18n::tr("ui.ai_button"), FontId::proportional(11.0), t.text);
+    let waiting = app.agent_chat.waiting();
+    if waiting > 0 {
+        let c = pos2(at.right() - 6.0, at.top() + 9.0);
+        painter.circle_filled(c, 6.0, t.warning);
+        painter.text(c, Align2::CENTER_CENTER, waiting.min(9).to_string(), FontId::proportional(9.5), t.toolbar);
+    }
+    if resp.on_hover_text(crate::agent_chat::panel_tip()).clicked() {
+        crate::agent_chat::toggle(app);
+    }
+}
+
 /// What a click on a panel drop-down row asks for.
 enum RowAction {
     None,