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Merged
wonderwhy-er merged 2 commits into from
Jun 3, 2026
+105 −68
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fix(file-preview): attribute events to source tools #479

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8c8f612
fix(file-preview): attribute events to source tools
edgarsskore May 24, 2026
644ab1c
fix(file-preview): harden editor metadata lookup
edgarsskore May 24, 2026
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9 changes: 9 additions & 0 deletions src/handlers/filesystem-handlers.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@ import {
moveFile,
getFileInfo,
writePdf,
getDefaultEditorMetadata,
type FileResult,
type MultiFileResult
} from '../tools/filesystem.js';
Expand Down Expand Up @@ -137,6 +138,8 @@ export async function handleReadFile(args: unknown): Promise<ServerResult> {
fileName: path.basename(resolvedFilePath),
filePath: resolvedFilePath,
fileType: 'unsupported' as const,
sourceTool: 'read_file',
...await getDefaultEditorMetadata(resolvedFilePath),
Comment on lines +141 to +142

@coderabbitai coderabbitai Bot May 24, 2026

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⚠️ Potential issue | 🔴 Critical | ⚡ Quick win

Make editor metadata enrichment best-effort so it never flip-flops successful operations into errors.

getDefaultEditorMetadata() is optional enrichment, but it currently gates the full response. If it throws after writeFile succeeds, callers can receive an error and retry non-idempotent writes (notably append), causing duplicate content.

Proposed fix 
+const safeDefaultEditorMetadata = async (filePath: string) => {
+    try {
+        return await getDefaultEditorMetadata(filePath);
+    } catch {
+        return {};
+    }
+};
...
-                    ...await getDefaultEditorMetadata(resolvedFilePath),
+                    ...await safeDefaultEditorMetadata(resolvedFilePath),
...
-                    ...await getDefaultEditorMetadata(resolvedFilePath),
+                    ...await safeDefaultEditorMetadata(resolvedFilePath),
...
-                    ...await getDefaultEditorMetadata(resolvedFilePath),
+                    ...await safeDefaultEditorMetadata(resolvedFilePath),
...
-                ...await getDefaultEditorMetadata(resolvedWritePath),
+                ...await safeDefaultEditorMetadata(resolvedWritePath),

Also applies to: 170-171, 191-192, 313-314

🤖 Prompt for AI Agents 
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@src/handlers/filesystem-handlers.ts` around lines 141 - 142, The call to
getDefaultEditorMetadata currently can throw and turn successful
writeFile/append operations into failures; change enrichment to be best-effort
by wrapping each await getDefaultEditorMetadata(resolvedFilePath) in a try/catch
inside the filesystem handler functions (e.g., where sourceTool: 'read_file' is
assembled), so that on error you log/debug the metadata error and continue
returning the successful operation result without throwing; merge metadata only
if the call succeeds. Apply this pattern to all occurrences (the blocks around
the existing getDefaultEditorMetadata calls).

content: pdfContent
.filter((item): item is { type: "text"; text: string } => item.type === "text")
.map((item) => item.text)
Expand Down Expand Up @@ -164,6 +167,8 @@ export async function handleReadFile(args: unknown): Promise<ServerResult> {
fileName: path.basename(resolvedFilePath),
filePath: resolvedFilePath,
fileType: 'image',
sourceTool: 'read_file',
...await getDefaultEditorMetadata(resolvedFilePath),
content: imageData,
imageData,
mimeType: fileResult.mimeType
Expand All @@ -183,6 +188,8 @@ export async function handleReadFile(args: unknown): Promise<ServerResult> {
fileName: path.basename(resolvedFilePath),
filePath: resolvedFilePath,
fileType,
sourceTool: 'read_file',
...await getDefaultEditorMetadata(resolvedFilePath),
content: textContent,
},
};
Expand Down Expand Up @@ -303,6 +310,8 @@ export async function handleWriteFile(args: unknown): Promise<ServerResult> {
fileName: path.basename(resolvedWritePath),
filePath: resolvedWritePath,
fileType: resolvePreviewFileType(resolvedWritePath),
sourceTool: 'write_file',
...await getDefaultEditorMetadata(resolvedWritePath),
},
};
} catch (error) {
Expand Down
10 changes: 8 additions & 2 deletions src/tools/edit.ts
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Expand Up @@ -15,7 +15,7 @@
* 3. Unify the editRange() signature to handle both text search/replace and structured edits
*/

import { readFile, writeFile, readFileInternal, validatePath } from './filesystem.js';
import { getDefaultEditorMetadata, readFile, writeFile, readFileInternal, validatePath } from './filesystem.js';
import fs from 'fs/promises';
import { ServerResult } from '../types.js';
import { recursiveFuzzyIndexOf, getSimilarityRatio } from './fuzzySearch.js';
Expand Down Expand Up @@ -227,6 +227,8 @@ RECOMMENDATION: For large search/replace operations, consider breaking them into
fileName: path.basename(resolvedEditPath),
filePath: resolvedEditPath,
fileType: resolvePreviewFileType(resolvedEditPath),
sourceTool: 'edit_block',
...await getDefaultEditorMetadata(resolvedEditPath),
Comment on lines +230 to +231

@coderabbitai coderabbitai Bot May 24, 2026

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⚠️ Potential issue | 🔴 Critical | ⚡ Quick win

Don’t let optional editor-metadata lookup fail successful edit operations.

These success paths perform the edit first, then await metadata. If metadata lookup fails, the tool returns an error despite a completed mutation, which can trigger duplicate retries.

Proposed fix 
+const safeDefaultEditorMetadata = async (filePath: string) => {
+    try {
+        return await getDefaultEditorMetadata(filePath);
+    } catch {
+        return {};
+    }
+};
...
-                ...await getDefaultEditorMetadata(resolvedEditPath),
+                ...await safeDefaultEditorMetadata(resolvedEditPath),
...
-                        ...await getDefaultEditorMetadata(resolvedRangePath),
+                        ...await safeDefaultEditorMetadata(resolvedRangePath),
...
-                        ...await getDefaultEditorMetadata(resolvedEditRangePath),
+                        ...await safeDefaultEditorMetadata(resolvedEditRangePath),

Also applies to: 443-444, 483-484

🤖 Prompt for AI Agents 
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@src/tools/edit.ts` around lines 230 - 231, The code currently awaits
getDefaultEditorMetadata(resolvedEditPath) and if that throws the entire edit
tool returns an error even though the edit completed; wrap the metadata lookup
in a try/catch around calls that populate metadata (e.g., where sourceTool:
'edit_block' and the other two occurrences at the same pattern), and on error
log a warning and set metadata to null/{} (or omit it) so the function returns
the successful edit result; ensure you only catch errors from
getDefaultEditorMetadata and do not change the edit/mutation result handling.

},
};
}
Expand Down Expand Up @@ -438,6 +440,8 @@ export async function handleEditBlock(args: unknown): Promise<ServerResult> {
fileName: path.basename(resolvedRangePath),
filePath: resolvedRangePath,
fileType: resolvePreviewFileType(resolvedRangePath),
sourceTool: 'edit_block',
...await getDefaultEditorMetadata(resolvedRangePath),
},
};
} catch (error) {
Expand Down Expand Up @@ -476,6 +480,8 @@ export async function handleEditBlock(args: unknown): Promise<ServerResult> {
fileName: path.basename(resolvedEditRangePath),
filePath: resolvedEditRangePath,
fileType: resolvePreviewFileType(resolvedEditRangePath),
sourceTool: 'edit_block',
...await getDefaultEditorMetadata(resolvedEditRangePath),
},
};
}
Expand All @@ -492,4 +498,4 @@ export async function handleEditBlock(args: unknown): Promise<ServerResult> {
search: parsed.old_string,
replace: parsed.new_string
}, parsed.expected_replacements);
}
}
42 changes: 41 additions & 1 deletion src/tools/filesystem.ts
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Expand Up @@ -2,6 +2,8 @@ import fs from "fs/promises";
import path from "path";
import os from 'os';
import fetch from 'cross-fetch';
import { execFile } from 'child_process';
import { promisify } from 'util';
import { capture } from '../utils/capture.js';
import { withTimeout } from '../utils/withTimeout.js';
import { configManager } from '../config-manager.js';
Expand Down Expand Up @@ -1041,4 +1043,42 @@ export async function writePdf(
} else {
throw new Error('Invalid content type for writePdf. Expected string (markdown) or array of operations.');
}
}
}

const execFileAsync = promisify(execFile);
const defaultEditorCache = new Map<string, { defaultEditorName: string; defaultEditorPath: string }>();

function escapeAppleScriptString(value: string): string {
return value.replace(/\\/g, '\\\\').replace(/"/g, '\\"');
}

export async function getDefaultEditorMetadata(filePath: string): Promise<{ defaultEditorName?: string; defaultEditorPath?: string }> {
if (os.platform() !== 'darwin') {
return {};
}

const extension = path.extname(filePath).toLowerCase();
const cacheKey = extension || path.basename(filePath).toLowerCase();
const cached = defaultEditorCache.get(cacheKey);
if (cached) {
return cached;
}

try {
const script = `set appAlias to default application of (info for POSIX file "${escapeAppleScriptString(filePath)}")\nreturn (name of (info for appAlias)) & linefeed & POSIX path of appAlias`;
const { stdout } = await execFileAsync('osascript', ['-e', script], { timeout: 12000 });
const lines = stdout.split('\n').map((line) => line.trim()).filter(Boolean);
const defaultEditorName = lines[lines.length - 2]?.replace(/\.app$/i, '') ?? '';
const defaultEditorPath = lines[lines.length - 1] ?? '';

if (defaultEditorName && defaultEditorPath.startsWith('/')) {
const metadata = { defaultEditorName, defaultEditorPath };
defaultEditorCache.set(cacheKey, metadata);
return metadata;
}
} catch {
// Generic UI fallback is good enough if detection fails.
}

return {};
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}
3 changes: 3 additions & 0 deletions src/types.ts
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Expand Up @@ -76,6 +76,9 @@ export interface FilePreviewStructuredContent {
fileName: string;
filePath: string;
fileType: PreviewFileType;
sourceTool?: string;
defaultEditorName?: string;
defaultEditorPath?: string;
content?: string;
imageData?: string;
mimeType?: string;
Expand Down
38 changes: 21 additions & 17 deletions src/ui/file-preview/src/app.ts
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Expand Up @@ -11,7 +11,7 @@ import { attachDirectoryHandlers } from './directory-controller.js';
import { buildDocumentLayout } from './document-layout.js';
import { getDocumentFullscreenAvailability, parseReadRange, stripReadStatusLine } from './document-workspace.js';
import { getFileTypeCapabilities, renderPayloadBody } from './file-type-handlers.js';
import { buildOpenInEditorCommand, buildOpenInFolderCommand, detectDefaultMarkdownEditor, renderMarkdownEditorAppIcon } from './host/external-actions.js';
import { buildOpenInEditorCommand, buildOpenInFolderCommand, renderMarkdownEditorAppIcon } from './host/external-actions.js';
import { attachSelectionContext } from './host/selection-context.js';
import { createMarkdownController } from './markdown/controller.js';
import {
Expand Down Expand Up @@ -47,7 +47,10 @@ let inlinePayloadBeforeFullscreen: RenderPayload | undefined;
let directoryBackPayload: RenderPayload | undefined;
let selectionAbortController: AbortController | null = null;
const markdownEditorAppCache = new Map<string, { appName: string; appPath?: string }>();
const markdownEditorAppPending = new Set<string>();

function getTelemetryToolName(payload: RenderPayload | undefined): string {
return typeof payload?.sourceTool === 'string' ? payload.sourceTool : 'read_file';
}

async function callToolIfReady(name: string, args: Record<string, unknown>): Promise<unknown | undefined> {
return rpcCallTool ? rpcCallTool(name, args) : undefined;
Expand Down Expand Up @@ -168,7 +171,10 @@ async function readAndResolvePayload(
try {
const freshPayload = await markdownController.readPayload(payload.filePath);
if (freshPayload) {
onReady(freshPayload);
onReady({
...freshPayload,
sourceTool: payload.sourceTool ?? freshPayload.sourceTool,
});
if (freshPayload.fileType === 'markdown') {
void markdownController.refreshFromDisk(freshPayload);
}
Expand Down Expand Up @@ -244,21 +250,16 @@ export function renderApp(
availableDisplayModes: getAvailableDisplayModes(),
}).canFullscreen;

if (payload.fileType === 'markdown' && payload.defaultEditorName) {
markdownEditorAppCache.set(payload.filePath, {
appName: payload.defaultEditorName,
appPath: payload.defaultEditorPath,
});
}

const defaultMarkdownEditor = payload.fileType === 'markdown'
? markdownEditorAppCache.get(payload.filePath)
: undefined;
if (payload.fileType === 'markdown' && !defaultMarkdownEditor) {
void detectDefaultMarkdownEditor({
filePath: payload.filePath,
editorAppCache: markdownEditorAppCache,
editorAppPending: markdownEditorAppPending,
callTool: callToolIfReady,
extractToolText,
onDetected: () => {
rerenderCurrent?.();
},
});
}

const layout = buildDocumentLayout({
payload,
Expand Down Expand Up @@ -477,13 +478,16 @@ export function bootstrapApp(): void {
const result = await app.requestDisplayMode({ mode });
return typeof result.mode === 'string' ? result.mode : null;
};
trackUiEvent = createUiEventTracker(
const filePreviewUiEvent = createUiEventTracker(
(name, args) => app.callServerTool({ name, arguments: args }),
{
component: 'file_preview',
baseParams: { tool_name: 'read_file' },
}
);
trackUiEvent = (event, params = {}) => filePreviewUiEvent(event, {
tool_name: getTelemetryToolName(currentPayload ?? hostPayload),
...params,
});

app.ontoolinput = (params) => {
const requestedPath = typeof params.arguments?.path === 'string' ? params.arguments.path : undefined;
Expand Down
47 changes: 0 additions & 47 deletions src/ui/file-preview/src/host/external-actions.ts
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Expand Up @@ -65,53 +65,6 @@ export function buildOpenInEditorCommand(
return `xdg-open ${shellQuote(trimmedPath)}`;
}

export async function detectDefaultMarkdownEditor(options: {
filePath: string;
editorAppCache: Map<string, { appName: string; appPath?: string }>;
editorAppPending: Set<string>;
callTool?: (name: string, args: Record<string, unknown>) => Promise<unknown | undefined>;
extractToolText: (value: unknown) => string | undefined;
onDetected?: () => void;
}): Promise<void> {
const trimmedPath = options.filePath.trim();
if (!trimmedPath || options.editorAppCache.has(trimmedPath) || options.editorAppPending.has(trimmedPath)) {
return;
}

const userAgent = navigator.userAgent.toLowerCase();
if (!userAgent.includes('mac')) {
return;
}

options.editorAppPending.add(trimmedPath);
try {
const detectCommand = `osascript -e ${shellQuote(`set appAlias to default application of (info for POSIX file "${trimmedPath.replace(/"/g, '\\"')}")
return (name of (info for appAlias)) & linefeed & POSIX path of appAlias`)}`;
const detectResult = await options.callTool?.('start_process', {
command: detectCommand,
timeout_ms: 12000,
});
const text = options.extractToolText(detectResult) ?? '';
if (!text || text.toLowerCase().includes('error') || text.toLowerCase().includes('execution')) {
return;
}
const lines = text.split('\n').map((line) => line.trim()).filter(Boolean);
const appName = lines[lines.length - 2]?.replace(/\.app$/i, '') ?? '';
const appPath = lines[lines.length - 1] ?? '';
if (appName && appPath.startsWith('/')) {
options.editorAppCache.set(trimmedPath, {
appName,
appPath,
});
options.onDetected?.();
}
} catch {
// Fall back to generic editor label.
} finally {
options.editorAppPending.delete(trimmedPath);
}
}

export function renderMarkdownEditorAppIcon(): string {
return '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M12 20h9"/><path d="M16.5 3.5a2.1 2.1 0 1 1 3 3L7 19l-4 1 1-4Z"/></svg>';
}
12 changes: 11 additions & 1 deletion test/test-file-handlers.js
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Expand Up @@ -18,7 +18,7 @@ import { fileURLToPath } from 'url';
import assert from 'assert';
import { readFile, writeFile, getFileInfo } from '../dist/tools/filesystem.js';
import { getFileHandler } from '../dist/utils/files/factory.js';
import { handleReadFile } from '../dist/handlers/filesystem-handlers.js';
import { handleReadFile, handleWriteFile } from '../dist/handlers/filesystem-handlers.js';
import { handleEditBlock } from '../dist/handlers/edit-search-handlers.js';

// Get directory name
Expand Down Expand Up @@ -306,20 +306,23 @@ async function testReadFilePreviewMetadata() {
assert.ok(markdownResult.structuredContent, 'Markdown should include structuredContent');
assert.strictEqual(markdownResult.structuredContent.fileType, 'markdown', 'Markdown fileType should be markdown');
assert.strictEqual(markdownResult.structuredContent.filePath, MD_FILE, 'Markdown file path should be present');
assert.strictEqual(markdownResult.structuredContent.sourceTool, 'read_file', 'Markdown preview should preserve source tool');
assert.strictEqual(markdownResult.structuredContent.content, markdownResult.content[0].text, 'Markdown structuredContent should include returned content');

const textResult = await handleReadFile({ path: TEXT_FILE });
assert.ok(Array.isArray(textResult.content), 'Result should include content array');
assert.ok(textResult.content[0].text.includes(textContent), 'Legacy content should still include text body');
assert.ok(textResult.structuredContent, 'Text should include structuredContent');
assert.strictEqual(textResult.structuredContent.fileType, 'text', 'Text fileType should be text');
assert.strictEqual(textResult.structuredContent.sourceTool, 'read_file', 'Text preview should preserve source tool');
assert.strictEqual(textResult.structuredContent.content, textResult.content[0].text, 'Text structuredContent should include returned content');

const htmlResult = await handleReadFile({ path: HTML_FILE });
assert.ok(Array.isArray(htmlResult.content), 'Result should include content array');
assert.ok(htmlResult.content[0].text.includes('<h1>Preview</h1>'), 'Legacy content should still include html body');
assert.ok(htmlResult.structuredContent, 'HTML should include structuredContent');
assert.strictEqual(htmlResult.structuredContent.fileType, 'html', 'HTML fileType should be html');
assert.strictEqual(htmlResult.structuredContent.sourceTool, 'read_file', 'HTML preview should preserve source tool');
assert.strictEqual(htmlResult.structuredContent.content, htmlResult.content[0].text, 'HTML structuredContent should include returned content');

const imageResult = await handleReadFile({ path: IMAGE_FILE });
Expand All @@ -332,6 +335,7 @@ async function testReadFilePreviewMetadata() {
assert.strictEqual(imageResult.structuredContent.content, imageResult.structuredContent.imageData, 'Image structuredContent should include file content');
assert.strictEqual(imageResult.structuredContent.mimeType, 'image/png', 'Image structured payload should include mimeType');
assert.strictEqual(imageResult.structuredContent.filePath, IMAGE_FILE, 'Image file path should be present');
assert.strictEqual(imageResult.structuredContent.sourceTool, 'read_file', 'Image preview should preserve source tool');

const svgResult = await handleReadFile({ path: SVG_FILE });
assert.ok(Array.isArray(svgResult.content), 'SVG result should include content array');
Expand All @@ -341,6 +345,11 @@ async function testReadFilePreviewMetadata() {
assert.strictEqual(svgResult.structuredContent.mimeType, 'image/svg+xml', 'SVG structured payload should include SVG mimeType');
assert.strictEqual(typeof svgResult.structuredContent.imageData, 'string', 'SVG structured payload should include imageData');
assert.ok(svgResult.structuredContent.imageData.length > 0, 'SVG structured payload should include non-empty imageData');
assert.strictEqual(svgResult.structuredContent.sourceTool, 'read_file', 'SVG preview should preserve source tool');

const writeResult = await handleWriteFile({ path: TEXT_FILE, content: 'written through handler' });
assert.ok(writeResult.structuredContent, 'write_file should include structuredContent');
assert.strictEqual(writeResult.structuredContent.sourceTool, 'write_file', 'write_file preview should preserve source tool');

const nullArgsResult = await handleReadFile(null);
assert.ok(Array.isArray(nullArgsResult.content), 'Null-args result should include content array');
Expand Down Expand Up @@ -375,6 +384,7 @@ async function testMarkdownExactMatchSave() {
assert.strictEqual(result.content[0].type, 'text', 'edit_block result[0] should be text');
assert.ok(result.structuredContent, 'edit_block should return structuredContent');
assert.ok(result.structuredContent.filePath, 'edit_block structuredContent should include filePath');
assert.strictEqual(result.structuredContent.sourceTool, 'edit_block', 'edit_block preview should preserve source tool');
assert.match(
result.content[0].text,
/\[Reading \d+ lines? from/,
Expand Down
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