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refactor: simplify tool output truncation to single config (#18446)

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This commit is contained in:
Sandy Tao
2026-02-06 13:41:19 -08:00
committed by GitHub
parent fd72a8c40f
commit 28805a4b2d
22 changed files with 56 additions and 189 deletions
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packages/core/src/utils/fileUtils.test.ts
+13 -25
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@@ -1125,7 +1125,6 @@ describe('fileUtils', () => {
'shell_123.txt',
);
expect(result.outputFile).toBe(expectedOutputFile);
expect(result.totalLines).toBe(1);
const savedContent = await fsPromises.readFile(
expectedOutputFile,
@@ -1200,43 +1199,32 @@ describe('fileUtils', () => {
expect(result.outputFile).toBe(expectedOutputFile);
});
it('should format multi-line output correctly', () => {
const lines = Array.from({ length: 50 }, (_, i) => `line ${i}`);
const content = lines.join('\n');
it('should truncate showing first 20% and last 80%', () => {
const content = 'abcdefghijklmnopqrstuvwxyz'; // 26 chars
const outputFile = '/tmp/out.txt';
// maxChars=10 -> head=2 (20%), tail=8 (80%)
const formatted = formatTruncatedToolOutput(content, outputFile, 10);
expect(formatted).toContain(
'Output too large. Showing the last 10 of 50 lines.',
);
expect(formatted).toContain('Showing first 2 and last 8 characters');
expect(formatted).toContain('For full output see: /tmp/out.txt');
expect(formatted).toContain('line 49');
expect(formatted).not.toContain('line 0');
expect(formatted).toContain('ab'); // first 2 chars
expect(formatted).toContain('stuvwxyz'); // last 8 chars
expect(formatted).toContain('[16 characters omitted]'); // 26 - 2 - 8 = 16
});
it('should truncate "elephant lines" (long single line in multi-line output)', () => {
const longLine = 'a'.repeat(2000);
const content = `line 1\n${longLine}\nline 3`;
const outputFile = '/tmp/out.txt';
const formatted = formatTruncatedToolOutput(content, outputFile, 3);
expect(formatted).toContain('(some long lines truncated)');
expect(formatted).toContain('... [LINE WIDTH TRUNCATED]');
expect(formatted.length).toBeLessThan(longLine.length);
});
it('should handle massive single-line string with character-based truncation', () => {
it('should format large content with head/tail truncation', () => {
const content = 'a'.repeat(50000);
const outputFile = '/tmp/out.txt';
const formatted = formatTruncatedToolOutput(content, outputFile);
// maxChars=4000 -> head=800 (20%), tail=3200 (80%)
const formatted = formatTruncatedToolOutput(content, outputFile, 4000);
expect(formatted).toContain(
'Output too large. Showing the last 4,000 characters',
'Showing first 800 and last 3,200 characters',
);
expect(formatted.endsWith(content.slice(-4000))).toBe(true);
expect(formatted).toContain('For full output see: /tmp/out.txt');
expect(formatted).toContain('[46,000 characters omitted]'); // 50000 - 800 - 3200
});
});
});