diff --git a/package.json b/package.json
index 33ffc8d..9d13b91 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
 	"displayName": "commitollama",
 	"description": "AI Commits with ollama",
 	"publisher": "Commitollama",
-	"version": "3.0.0",
+	"version": "3.0.1",
 	"repository": {
 		"type": "git",
 		"url": "https://github.com/anjerodev/commitollama.git"
diff --git a/src/diffFallback.ts b/src/diffFallback.ts
new file mode 100644
index 0000000..da278d1
--- /dev/null
+++ b/src/diffFallback.ts
@@ -0,0 +1,26 @@
+export function buildDiffFallbackSummary(file: string, diff: string): string {
+	const lines = diff.split('\n')
+	const addedLines = lines
+		.filter((line) => line.startsWith('+') && !line.startsWith('+++'))
+		.map((line) => line.slice(1).trim())
+		.filter(Boolean)
+	const removedCount = lines.filter(
+		(line) => line.startsWith('-') && !line.startsWith('---'),
+	).length
+
+	if (addedLines.length > 0) {
+		const preview = addedLines.slice(0, 2).join('; ')
+		const clipped =
+			preview.length > 80 ? `${preview.slice(0, 77)}...` : preview
+		if (removedCount > 0) {
+			return `Update ${file}: add ${addedLines.length} line(s), remove ${removedCount} line(s) — ${clipped}`
+		}
+		return `Update ${file}: add ${addedLines.length} line(s) — ${clipped}`
+	}
+
+	if (removedCount > 0) {
+		return `Update ${file}: remove ${removedCount} line(s)`
+	}
+
+	return `Update ${file}`
+}
diff --git a/src/scheduler.ts b/src/scheduler.ts
index 0bf21a8..10df8de 100644
--- a/src/scheduler.ts
+++ b/src/scheduler.ts
@@ -1,5 +1,6 @@
 import * as vscode from 'vscode'
 import { summaryCache } from './cache'
+import { isLowQualitySummary } from './commitQuality'
 import { config } from './config'
 import { logExtensionError } from './security/log'
 import { summarizeFileDiff } from './summarizer'
@@ -101,7 +102,9 @@ export class BackgroundScanner {
 			}
 
 			const summary = await summarizeFileDiff(workingDiff)
-			summaryCache.set(uri.fsPath, hash, summary)
+			if (!isLowQualitySummary(summary)) {
+				summaryCache.set(uri.fsPath, hash, summary)
+			}
 		} catch (error) {
 			logExtensionError(`backgroundScan ${uri.fsPath}`, error)
 		}
diff --git a/src/test/diffFallback.test.ts b/src/test/diffFallback.test.ts
new file mode 100644
index 0000000..a378a0d
--- /dev/null
+++ b/src/test/diffFallback.test.ts
@@ -0,0 +1,32 @@
+import * as assert from 'node:assert'
+import { buildDiffFallbackSummary } from '../diffFallback'
+
+suite('diff fallback', () => {
+	test('Should summarize added lines from a unified diff', () => {
+		const diff = [
+			'--- a/src/foo.ts',
+			'+++ b/src/foo.ts',
+			'@@ -1,2 +1,3 @@',
+			' const x = 1',
+			'+const y = 2',
+			' return x',
+		].join('\n')
+
+		const summary = buildDiffFallbackSummary('src/foo.ts', diff)
+		assert.match(summary, /add 1 line/)
+		assert.match(summary, /const y = 2/)
+	})
+
+	test('Should summarize removed lines', () => {
+		const diff = [
+			'--- a/src/foo.ts',
+			'+++ b/src/foo.ts',
+			'@@ -1,2 +1,1 @@',
+			'-const y = 2',
+			' const x = 1',
+		].join('\n')
+
+		const summary = buildDiffFallbackSummary('src/foo.ts', diff)
+		assert.match(summary, /remove 1 line/)
+	})
+})
diff --git a/src/utils.ts b/src/utils.ts
index 572f881..cb791cb 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,6 +1,8 @@
+import { relative } from 'node:path'
 import * as vscode from 'vscode'
 import { summaryCache } from './cache'
 import { isLowQualitySummary } from './commitQuality'
+import { buildDiffFallbackSummary } from './diffFallback'
 import { type ChangeSummary, getCommitMessage } from './generator'
 import { ensureModelSelected } from './modelSelection'
 import { formatExtensionError, logExtensionError } from './security/log'
@@ -23,39 +25,62 @@ export function setConfig<K extends keyof ExtensionConfig>(
 		.update(key, value, vscode.ConfigurationTarget.Workspace)
 }
 
+function getRepoRelativePath(repo: Repository, uri: vscode.Uri): string {
+	const rootPath = repo.rootUri.fsPath
+	if (uri.fsPath.startsWith(rootPath)) {
+		return relative(rootPath, uri.fsPath).replace(/\\/g, '/')
+	}
+	return vscode.workspace.asRelativePath(uri, false)
+}
+
 export async function getSummaryUriDiff(
 	repo: Repository,
 	uri: vscode.Uri,
 ): Promise<string> {
-	const path = vscode.workspace.asRelativePath(uri)
+	const path = getRepoRelativePath(repo, uri)
 	return repo.diffIndexWithHEAD(path)
 }
 
+async function resolveSummary(
+	file: string,
+	cacheKey: string,
+	diff: string,
+	diffHash: string,
+): Promise<string> {
+	const cached = summaryCache.get(cacheKey)
+	if (cached?.diffHash === diffHash && !isLowQualitySummary(cached.summary)) {
+		return cached.summary
+	}
+
+	try {
+		const summary = await summarizeFileDiff(diff)
+		if (!isLowQualitySummary(summary)) {
+			summaryCache.set(cacheKey, diffHash, summary)
+			return summary
+		}
+	} catch (error) {
+		logExtensionError('summarizeStagedChange', error)
+	}
+
+	return buildDiffFallbackSummary(file, diff)
+}
+
 async function summarizeStagedChange(
 	repo: Repository,
 	uri: vscode.Uri,
 ): Promise<ChangeSummary | null> {
-	const path = vscode.workspace.asRelativePath(uri)
+	const path = getRepoRelativePath(repo, uri)
 	const diff = await repo.diffIndexWithHEAD(path)
 	if (!diff || diff.trim() === '') {
 		return null
 	}
 
-	const hash = summaryCache.computeHash(diff)
-	const cached = summaryCache.get(uri.fsPath)
-
-	let summary: string
-	if (cached && cached.diffHash === hash) {
-		summary = cached.summary
-	} else {
-		summary = await summarizeFileDiff(diff)
-		summaryCache.set(uri.fsPath, hash, summary)
-	}
-
-	if (isLowQualitySummary(summary)) {
-		return null
-	}
-
+	const summary = await resolveSummary(
+		path,
+		uri.fsPath,
+		diff,
+		summaryCache.computeHash(diff),
+	)
 	return { file: path, summary }
 }
 
@@ -95,13 +120,16 @@ export async function createCommitMessage(repo: Repository) {
 				if (summaries.length === 0) {
 					const fullDiff = await repo.diff(true)
 					if (fullDiff?.trim()) {
-						const summary = await summarizeFileDiff(fullDiff)
-						if (!isLowQualitySummary(summary)) {
-							summaries.push({
-								file: 'staged changes',
-								summary,
-							})
-						}
+						const summary = await resolveSummary(
+							'staged changes',
+							'staged changes',
+							fullDiff,
+							summaryCache.computeHash(fullDiff),
+						)
+						summaries.push({
+							file: 'staged changes',
+							summary,
+						})
 					}
 				}
 
diff --git a/tsconfig.json b/tsconfig.json
index dc2124d..cb503a2 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,6 +3,7 @@
 		"module": "commonjs",
 		"target": "ES2021",
 		"lib": ["ES2021", "DOM"],
+		"typeRoots": ["./node_modules/@types"],
 		"types": ["node", "mocha"],
 		"skipLibCheck": true,
 		"noEmit": true,