fix(web-fetch): report actual spill character count

Alix-007 · Alix-007 · commit 9152389df4c6 · 2026-07-07T13:14:47.000+08:00
diff --git a/src/agents/tools/web-fetch.ts b/src/agents/tools/web-fetch.ts
@@ -316,6 +316,7 @@ async function spillWebFetchContent(
   // maxChars/maxCharsCap bound the model-visible return text. Recoverable spill
   // uses this fixed file cap so vanished pages can still be read after truncation.
   const content = truncateUtf16Safe(value, WEB_FETCH_SPILL_MAX_CHARS);
+  const spilledChars = content.length;
   const fullOutputPath = await writePrivateTempFile(
     "openclaw-web-fetch",
     wrapWebContent(content, "web_fetch"),
@@ -325,7 +326,7 @@ async function spillWebFetchContent(
   const spillNote = sourceTruncated
     ? " Spilled available content from truncated response."
     : spillCapped
-      ? ` Spilled first ${WEB_FETCH_SPILL_MAX_CHARS} chars.`
+      ? ` Spilled first ${spilledChars} chars.`
       : "";
   const fullOutputFooter = formatFullOutputFooter(fullOutputPath);
   const footer = `\n\n[Showing truncated web_fetch content. ${fullOutputFooter}.${spillNote}]`;
@@ -345,7 +346,7 @@ async function spillWebFetchContent(
     text,
     wrappedLength: text.length,
     fullOutputPath,
-    spilledChars: content.length,
+    spilledChars,
     spillTruncated,
   };
 }
diff --git a/src/agents/tools/web-tools.fetch.test.ts b/src/agents/tools/web-tools.fetch.test.ts
@@ -516,6 +516,7 @@ describe("web_fetch extraction fallbacks", () => {
 
     const result = await tool?.execute?.("call", { url: "https://example.com/spill-utf16" });
     const details = result?.details as {
+      text?: string;
       fullOutputPath?: string;
       spilledChars?: number;
       spillTruncated?: boolean;
@@ -525,6 +526,7 @@ describe("web_fetch extraction fallbacks", () => {
     }
 
     expect(details.spilledChars).toBe(WEB_FETCH_SPILL_MAX_CHARS - 1);
+    expect(details.text).toContain(`Spilled first ${WEB_FETCH_SPILL_MAX_CHARS - 1} chars.`);
     expect(details.spillTruncated).toBe(true);
     const spilledText = await readFile(details.fullOutputPath, "utf8");
     expect(spilledText).toContain(prefix);
