diff --git a/src/lib/parsers/default/utils/summarizeDiffs.test.ts b/src/lib/parsers/default/utils/summarizeDiffs.test.ts
index a346b5f9..e1c087d9 100644
--- a/src/lib/parsers/default/utils/summarizeDiffs.test.ts
+++ b/src/lib/parsers/default/utils/summarizeDiffs.test.ts
@@ -112,6 +112,65 @@ describe('summarizeDirectoryDiff', () => {
     expect(result.diffs).toEqual(directory.diffs) // Original diffs preserved
   })
 
+  // LIB-11: this failure used to go to bare console.error, bypassing the
+  // logger entirely (invisible under --quiet, untestable, and on a
+  // different channel than the rest of the run's output).
+  it('reports a directory summarization failure through the logger, not console.error (LIB-11)', async () => {
+    const summarizeMock = jest.requireMock('../../../langchain/chains/summarize').summarize
+    summarizeMock.mockRejectedValueOnce(new Error('provider timed out'))
+    const consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => undefined)
+    const mockLogger = { verbose: jest.fn(), error: jest.fn() }
+
+    const directory = {
+      path: 'src/components',
+      diffs: [{ file: 'src/components/A.tsx', diff: 'a'.repeat(400), summary: 'A', tokenCount: 100 }],
+      tokenCount: 100,
+    }
+
+    const result = await summarizeDirectoryDiff(directory, {
+      chain: mockChain,
+      textSplitter: mockTextSplitter,
+      tokenizer: mockTokenizer,
+      logger: mockLogger as never,
+    })
+
+    // Original directory diff preserved on failure.
+    expect(result).toEqual(directory)
+    expect(mockLogger.error).toHaveBeenCalledWith(
+      expect.stringContaining('src/components')
+    )
+    expect(mockLogger.error).toHaveBeenCalledWith(
+      expect.stringContaining('provider timed out')
+    )
+    expect(consoleErrorSpy).not.toHaveBeenCalled()
+
+    consoleErrorSpy.mockRestore()
+    summarizeMock.mockImplementation(async (docs: unknown[]) => `Summary of ${docs.length} file(s)`)
+  })
+
+  it('does not throw when the failure occurs and no logger was supplied', async () => {
+    const summarizeMock = jest.requireMock('../../../langchain/chains/summarize').summarize
+    summarizeMock.mockRejectedValueOnce(new Error('provider timed out'))
+    const consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => undefined)
+
+    const directory = {
+      path: 'src/components',
+      diffs: [{ file: 'src/components/A.tsx', diff: 'a'.repeat(400), summary: 'A', tokenCount: 100 }],
+      tokenCount: 100,
+    }
+
+    await expect(
+      summarizeDirectoryDiff(directory, {
+        chain: mockChain,
+        textSplitter: mockTextSplitter,
+        tokenizer: mockTokenizer,
+      })
+    ).resolves.toEqual(directory)
+
+    consoleErrorSpy.mockRestore()
+    summarizeMock.mockImplementation(async (docs: unknown[]) => `Summary of ${docs.length} file(s)`)
+  })
+
   describe('diff-summary cache hit/miss reporting (#1958)', () => {
     const summarizeMock = jest.requireMock('../../../langchain/chains/summarize').summarize
     const cacheHitLogger = { verbose: jest.fn() }
diff --git a/src/lib/parsers/default/utils/summarizeDiffs.ts b/src/lib/parsers/default/utils/summarizeDiffs.ts
index 6d06b1d3..c2431add 100644
--- a/src/lib/parsers/default/utils/summarizeDiffs.ts
+++ b/src/lib/parsers/default/utils/summarizeDiffs.ts
@@ -143,7 +143,15 @@ export async function summarizeDirectoryDiff(
       tokenCount: newTokenTotal,
     }
   } catch (error) {
-    console.error(error)
+    // On error, return the original directory diff unchanged. Routed
+    // through the logger (not console.error) so it respects --quiet and
+    // reaches the same channel the rest of the run's output does —
+    // silently, this returns the UNSUMMARIZED diff, which is exactly
+    // what blows the token budget the summarizer exists to protect
+    // (LIB-11).
+    logger?.error?.(
+      `Failed to summarize directory "${directory.path}": ${error instanceof Error ? error.message : String(error)}`,
+    )
     return directory
   }
 }
diff --git a/src/lib/parsers/default/utils/summarizeLargeFiles.test.ts b/src/lib/parsers/default/utils/summarizeLargeFiles.test.ts
index 449bc3a4..ca8cfe03 100644
--- a/src/lib/parsers/default/utils/summarizeLargeFiles.test.ts
+++ b/src/lib/parsers/default/utils/summarizeLargeFiles.test.ts
@@ -27,6 +27,7 @@ describe('summarizeLargeFiles', () => {
   const mockLogger = {
     verbose: jest.fn().mockReturnThis(),
     log: jest.fn().mockReturnThis(),
+    error: jest.fn().mockReturnThis(),
     startSpinner: jest.fn().mockReturnThis(),
     stopSpinner: jest.fn().mockReturnThis(),
     startTimer: jest.fn().mockReturnThis(),
@@ -382,7 +383,6 @@ describe('summarizeLargeFiles', () => {
   })
 
   it('keeps the raw diff when summarize() rejects with an empty-summary error (#1700)', async () => {
-    const consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => undefined)
     mockSummarize.mockRejectedValueOnce(
       new Error('summarize: chain returned an empty summary')
     )
@@ -408,6 +408,36 @@ describe('summarizeLargeFiles', () => {
 
     // Raw diff preserved, not overwritten with an empty summary.
     expect(result[0]).toEqual(diffs[0])
+  })
+
+  // LIB-11: this failure used to go to bare console.error, bypassing the
+  // logger entirely (invisible under --quiet, untestable, and on a
+  // different channel than the rest of the run's output).
+  it('reports a per-file summarization failure through the logger, not console.error (LIB-11)', async () => {
+    const consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => undefined)
+    mockSummarize.mockRejectedValueOnce(new Error('provider timed out'))
+
+    const diffs: FileDiff[] = [
+      { file: 'large.ts', diff: 'a'.repeat(2000), summary: 'large.ts', tokenCount: 600 },
+    ]
+
+    await summarizeLargeFiles(diffs, {
+      maxFileTokens: 500,
+      minTokensForSummary: 400,
+      maxConcurrent: 4,
+      tokenizer: mockTokenizer,
+      logger: mockLogger as never,
+      chain: mockChain,
+      textSplitter: mockTextSplitter,
+    })
+
+    expect(mockLogger.error).toHaveBeenCalledWith(
+      expect.stringContaining('large.ts')
+    )
+    expect(mockLogger.error).toHaveBeenCalledWith(
+      expect.stringContaining('provider timed out')
+    )
+    expect(consoleErrorSpy).not.toHaveBeenCalled()
     consoleErrorSpy.mockRestore()
   })
 
@@ -442,6 +472,7 @@ describe('diff-summary cache hit/miss reporting (#1958)', () => {
   const mockLogger = {
     verbose: jest.fn().mockReturnThis(),
     log: jest.fn().mockReturnThis(),
+    error: jest.fn().mockReturnThis(),
     startSpinner: jest.fn().mockReturnThis(),
     stopSpinner: jest.fn().mockReturnThis(),
     startTimer: jest.fn().mockReturnThis(),
@@ -551,6 +582,7 @@ describe('preprocessLargeFiles', () => {
   const mockLogger = {
     verbose: jest.fn().mockReturnThis(),
     log: jest.fn().mockReturnThis(),
+    error: jest.fn().mockReturnThis(),
     startSpinner: jest.fn().mockReturnThis(),
     stopSpinner: jest.fn().mockReturnThis(),
     startTimer: jest.fn().mockReturnThis(),
diff --git a/src/lib/parsers/default/utils/summarizeLargeFiles.ts b/src/lib/parsers/default/utils/summarizeLargeFiles.ts
index a25469ef..d30959af 100644
--- a/src/lib/parsers/default/utils/summarizeLargeFiles.ts
+++ b/src/lib/parsers/default/utils/summarizeLargeFiles.ts
@@ -309,8 +309,14 @@ async function summarizeFileDiff(
       tokenCount: newTokenCount,
     }
   } catch (error) {
-    // On error, return original diff unchanged
-    console.error(`Failed to summarize file ${fileDiff.file}:`, error)
+    // On error, return original diff unchanged. Routed through the
+    // logger (not console.error) so it respects --quiet and reaches the
+    // same channel the rest of the run's output does — silently, this
+    // returns the UNSUMMARIZED diff, which is exactly what blows the
+    // token budget the summarizer exists to protect (LIB-11).
+    logger.error(
+      `Failed to summarize file ${fileDiff.file}: ${error instanceof Error ? error.message : String(error)}`,
+    )
     return fileDiff
   }
 }