Let the agent set the merge commit title, defaulting to the task title

web/dist/state.js

@@ -130,6 +130,7 @@ export function handleEvent(ev) {
             void loadProjects();
             break;
         case "task.created":
+        case "task.merge_title":
         case "task.merged":
         case "task.discarded":
             if (ev.project_id) {

web/dist/task.js

@@ -93,7 +93,7 @@ export function mountTranscript(root) {
         const target = state.projects.find((p) => p.id === task.project_id)?.default_branch ?? "the default branch";
         const busy = sess?.state === "running" || sess?.state === "queued";
         const merge = h("button", { disabled: busy, title: `The agent merges ${target} in, then byre squashes into one commit on ${target}; nothing is pushed` }, "Merge");
-        merge.onclick = () => confirmChanges(task, (u) => `Merge "${task.title}" into ${target}? The agent first merges ${target} in and resolves any conflicts; when that turn ends, ${changesText(u)} become one commit on ${target} and the task closes. Nothing is pushed.`, async () => {
+        merge.onclick = () => confirmChanges(task, (u) => `Merge "${task.title}" into ${target}? The agent first merges ${target} in and resolves any conflicts; when that turn ends, ${changesText(u)} become one commit on ${target} titled "${task.merge_title}", and the task closes. Nothing is pushed.`, async () => {
             await post("/api/tasks/{taskId}/merge", { path: { taskId: task.id } });
         });
         const mergeIn = h("button", { disabled: busy, title: `Ask the agent to merge ${target} into this branch and resolve any conflicts` }, `Merge ${target} in`);
@@ -604,6 +604,8 @@ function renderEvent(ev, ctx) {
             }
             return null;
         }
+        case "task.merge_title":
+            return h("div", { class: "note" }, `${ev.actor} set the merge commit title to "${String(p["merge_title"])}" `, when);
         case "task.merged":
             return h("div", { class: "note" }, `${ev.actor} merged the task${p["commit"] ? ` as ${String(p["commit"]).slice(0, 7)}` : ""} `, when);
         case "task.discarded":

web/src/api.gen.ts

@@ -121,7 +121,7 @@ export interface paths {
         };
         get?: never;
         put?: never;
-        /** @description Starts the same agent turn as merge-in. When that turn ends normally, byre squashes the task's worktree into one commit on the project's default branch, fast-forwards the project's checkout to it, then removes the worktree and branch and marks the task merged. Nothing is pushed. Refused while a turn is running or queued. */
+        /** @description Starts the same agent turn as merge-in. When that turn ends normally, byre squashes the task's worktree into one commit titled with the task's merge_title on the project's default branch, fast-forwards the project's checkout to it, then removes the worktree and branch and marks the task merged. Nothing is pushed. Refused while a turn is running or queued. */
         post: operations["mergeTask"];
         delete?: never;
         options?: never;
@@ -473,6 +473,8 @@ export interface components {
             id: string;
             project_id: string;
             title: string;
+            /** @description The title of the squash commit Merge makes: the task title until the agent sets another with set_merge_title. */
+            merge_title: string;
             branch: string;
             worktree_path: string;
             base_ref: string;

web/src/state.ts

@@ -152,6 +152,7 @@ export function handleEvent(ev: ByreEvent): void {
       void loadProjects();
       break;
     case "task.created":
+    case "task.merge_title":
     case "task.merged":
     case "task.discarded":
       if (ev.project_id) {

web/src/task.ts

@@ -125,7 +125,7 @@ export function mountTranscript(root: HTMLElement): () => void {
       confirmChanges(
         task,
         (u) =>
-          `Merge "${task.title}" into ${target}? The agent first merges ${target} in and resolves any conflicts; when that turn ends, ${changesText(u)} become one commit on ${target} and the task closes. Nothing is pushed.`,
+          `Merge "${task.title}" into ${target}? The agent first merges ${target} in and resolves any conflicts; when that turn ends, ${changesText(u)} become one commit on ${target} titled "${task.merge_title}", and the task closes. Nothing is pushed.`,
         async () => {
           await post("/api/tasks/{taskId}/merge", { path: { taskId: task.id } });
         },
@@ -700,6 +700,9 @@ function renderEvent(ev: ByreEvent, ctx: Ctx): HTMLElement | null {
       return null;
     }
 
+    case "task.merge_title":
+      return h("div", { class: "note" }, `${ev.actor} set the merge commit title to "${String(p["merge_title"])}" `, when);
+
     case "task.merged":
       return h("div", { class: "note" }, `${ev.actor} merged the task${p["commit"] ? ` as ${String(p["commit"]).slice(0, 7)}` : ""} `, when);