fix: print the running tool once, not twice (#17)

src/lib/types.ts

@@ -158,6 +158,24 @@ export interface SessionSummary {
  */
 export type VisionSupport = "yes" | "no" | "unknown";
 
+/**
+ * The tool running right now, and how stale it is getting.
+ *
+ * Lives here rather than beside the chat state machine so that `thread.ts` can
+ * carry it into the transcript, which is the only place it is now rendered.
+ */
+export interface ToolActivity {
+  /** Human-readable label, e.g. "Searching the web". */
+  label: string;
+  /**
+   * How many times this turn has now started this *identical* call.
+   *
+   * Counted by the agent over name and arguments together, so two different
+   * searches are two tools doing their job rather than a repeat.
+   */
+  count: number;
+}
+
 /** A model as reported by `GET /api/tags`. */
 export interface ModelInfo {
   name: string;
@@ -204,6 +222,16 @@ export interface ThreadMessage {
   error?: string;
   /** Activity line shown while this message is streaming, e.g. "Searching the web". */
   status?: string;
+  /**
+   * The tool this message is waiting on, when there is one.
+   *
+   * Separate from {@link ThreadMessage.status} because the two are rendered from
+   * different triggers: the status is a stand-in used only while there is no text
+   * to read, while a running tool is worth saying whether or not tokens have
+   * started arriving. Carrying both is what lets one line be printed for one
+   * fact, rather than the same sentence appearing twice at the top of a turn.
+   */
+  activity?: ToolActivity;
   /** Images attached to this question. Only ever non-empty on a user message. */
   attachments: Attachment[];
 }