fix(coding-agent): handle empty session titles and session info metadata (#2304)

* fix(coding-agent): handle empty session titles in tree

* fix(coding-agent): ignore session info in summaries

* docs: update changelog for PR #2304

packages/coding-agent/CHANGELOG.md

@@ -6,6 +6,10 @@
 
 - Changed custom tool system prompt behavior so extension and SDK tools are included in the default `Available tools` section only when they provide `promptSnippet`. Omitting `promptSnippet` now leaves the tool out of that section instead of falling back to `description` ([#2285](https://github.com/badlogic/pi-mono/issues/2285))
 
+### Fixed
+
+- Fixed session title handling in `/tree`, compaction, and branch summarization so empty title clears render correctly and `session_info` entries stay out of summaries ([#2304](https://github.com/badlogic/pi-mono/pull/2304) by [@aliou](https://github.com/aliou))
+
 ## [0.58.4] - 2026-03-16
 
 ### Fixed

packages/coding-agent/src/core/compaction/branch-summarization.ts

@@ -162,6 +162,7 @@ function getMessageFromEntry(entry: SessionEntry): AgentMessage | undefined {
 		case "model_change":
 		case "custom":
 		case "label":
+		case "session_info":
 			return undefined;
 	}
 }

packages/coding-agent/src/core/compaction/compaction.ts

@@ -317,7 +317,10 @@ function findValidCutPoints(entries: SessionEntry[], startIndex: number, endInde
 			case "custom":
 			case "custom_message":
 			case "label":
+			case "session_info":
+				break;
 		}
+
 		// branch_summary and custom_message are user-role messages, valid cut points
 		if (entry.type === "branch_summary" || entry.type === "custom_message") {
 			cutPoints.push(i);

packages/coding-agent/src/core/session-manager.ts

@@ -565,12 +565,10 @@ async function buildSessionInfo(filePath: string): Promise<SessionInfo | null> {
 		let name: string | undefined;
 
 		for (const entry of entries) {
-			// Extract session name (use latest)
+			// Extract session name (use latest, including explicit clears)
 			if (entry.type === "session_info") {
 				const infoEntry = entry as SessionInfoEntry;
-				if (infoEntry.name) {
+				name = infoEntry.name?.trim() || undefined;
-					name = infoEntry.name.trim();
-				}
 			}
 
 			if (entry.type !== "message") continue;
@@ -913,12 +911,13 @@ export class SessionManager {
 
 	/** Get the current session name from the latest session_info entry, if any. */
 	getSessionName(): string | undefined {
-		// Walk entries in reverse to find the latest session_info with a name
+		// Walk entries in reverse to find the latest session_info entry.
+		// Empty names explicitly clear the session title.
 		const entries = this.getEntries();
 		for (let i = entries.length - 1; i >= 0; i--) {
 			const entry = entries[i];
-			if (entry.type === "session_info" && entry.name) {
+			if (entry.type === "session_info") {
-				return entry.name;
+				return entry.name?.trim() || undefined;
 			}
 		}
 		return undefined;

packages/coding-agent/src/modes/interactive/components/tree-selector.ts

@@ -302,7 +302,8 @@ class TreeList implements Component {
 				entry.type === "label" ||
 				entry.type === "custom" ||
 				entry.type === "model_change" ||
-				entry.type === "thinking_level_change";
+				entry.type === "thinking_level_change" ||
+				entry.type === "session_info";
 
 			switch (this.filterMode) {
 				case "user-only":
@@ -535,6 +536,10 @@ class TreeList implements Component {
 			case "branch_summary":
 				parts.push("branch summary", entry.summary);
 				break;
+			case "session_info":
+				parts.push("title");
+				if (entry.name) parts.push(entry.name);
+				break;
 			case "model_change":
 				parts.push("model", entry.modelId);
 				break;
@@ -755,6 +760,11 @@ class TreeList implements Component {
 			case "label":
 				result = theme.fg("dim", `[label: ${entry.label ?? "(cleared)"}]`);
 				break;
+			case "session_info":
+				result = entry.name
+					? [theme.fg("dim", "[title: "), theme.fg("dim", entry.name), theme.fg("dim", "]")].join("")
+					: [theme.fg("dim", "[title: "), theme.italic(theme.fg("dim", "empty")), theme.fg("dim", "]")].join("");
+				break;
 			default:
 				result = "";
 		}