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fix(gateway): safely extract text from content arrays in prompt builder (#24946)

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* fix(gateway): safely extract text from message content arrays in prompt builder

When HistoryEntry.body is a content array (e.g. [{type:"text",
text:"hello"}]) rather than a plain string, template literal
interpolation produces "[object Object]" instead of the actual message
text. This affects users whose session messages were stored with array
content format.

Add a safeBody helper that detects non-string body values and uses
extractTextFromChatContent to extract the text, preventing the
[object Object] serialization in both the current-message return path
and the history formatting path.

Fixes openclaw#24688

Co-authored-by: Cursor <cursoragent@cursor.com>

* fix: format gateway agent prompt helper (#24946)

---------

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>
This commit is contained in:
Sid
2026-02-24 11:33:37 +08:00
committed by GitHub
parent e3da57d956
commit c1fe688d40
1 changed files with 15 additions and 2 deletions
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17
src/gateway/agent-prompt.ts
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@@ -1,10 +1,23 @@
import { buildHistoryContextFromEntries, type HistoryEntry } from "../auto-reply/reply/history.js";
import { extractTextFromChatContent } from "../shared/chat-content.js";
export type ConversationEntry = {
role: "user" | "assistant" | "tool";
entry: HistoryEntry;
};
/**
* Coerce body to string. Handles cases where body is a content array
* (e.g. [{type:"text", text:"hello"}]) that would serialize as
* [object Object] if used directly in a template literal.
*/
function safeBody(body: unknown): string {
if (typeof body === "string") {
return body;
}
return extractTextFromChatContent(body) ?? "";
}
export function buildAgentMessageFromConversationEntries(entries: ConversationEntry[]): string {
if (entries.length === 0) {
return "";
@@ -31,10 +44,10 @@ export function buildAgentMessageFromConversationEntries(entries: ConversationEn
const historyEntries = entries.slice(0, currentIndex).map((e) => e.entry);
if (historyEntries.length === 0) {
return currentEntry.body;
return safeBody(currentEntry.body);
}
const formatEntry = (entry: HistoryEntry) => `${entry.sender}: ${entry.body}`;
const formatEntry = (entry: HistoryEntry) => `${entry.sender}: ${safeBody(entry.body)}`;
return buildHistoryContextFromEntries({
entries: [...historyEntries, currentEntry],
currentMessage: formatEntry(currentEntry),