Version 2.0.63

What: New performance monitoring that detects and logs slow filesystem and shell command operations.

How it works:

• All synchronous filesystem operations (20 in total) are now wrapped with timing instrumentation
• Shell command executions via execSyncWithDefaults are similarly monitored
• Operations exceeding 5ms are logged to debug output with the operation name and duration

Details:

• Log format: [SLOW OPERATION DETECTED] fs.readFileSync (12.3ms) or [SLOW OPERATION DETECTED] execSyncWithDefaults (156.7ms): git status...
• Monitored fs operations include: existsSync, statSync, readFileSync, writeFileSync, appendFileSync, copyFileSync, unlinkSync, renameSync, readdirSync, mkdirSync, rmdirSync, rmSync, and others
• For shell commands, the first 100 characters of the command are included in the log
• Logs are written to debug output (controlled by CLAUDE_CODE_DEBUG_LOGS_DIR environment variable)
• Evidence: XX() wrapper function at line 554, threshold Zl2 = 5 at line 605, shell monitoring in MG() at line 16934

What: Automatic retry mechanism when ripgrep encounters "Resource temporarily unavailable" (EAGAIN/error 11) errors.

How it works: When ripgrep fails with an EAGAIN error (common in high-concurrency environments), Claude Code now:

1. Detects the error from stderr output
2. Logs a debug message
3. Retries the search with single-threaded mode (-j 1)
4. Sets a global flag to use single-threaded mode for all subsequent ripgrep calls

Details:

• Error detection function lJ9() checks for "os error 11" or "Resource temporarily unavailable" strings
• Only retries once to prevent infinite loops
• Telemetry event tengu_ripgrep_eagain_retry is logged when this occurs
• Evidence: lJ9() function at line 17125, retry logic at lines 17163-17178

What: Settings are now only written to disk when OAuth account information actually changes.

How it works:

• Previously, every call to update OAuth account settings triggered a disk write
• Now, all five account fields (accountUuid, emailAddress, organizationUuid, displayName, hasExtraUsageEnabled) are compared before writing
• If all fields match the existing stored values, the write is skipped

Details:

• Reduces unnecessary disk I/O during token refresh operations
• Uses strict equality checks with optional chaining for safety
• Evidence: HW1() function at line 74155 with comparison at lines 74170-74176, compared to old unconditional G$1() function

What: Startup performance telemetry sampling rate increased from 0.1% to 0.5% of CLI invocations.

Details:

• Constant changed from OP9 = 0.001 to Xa2 = 0.005
• Provides 5x more data points for analyzing real-world startup performance
• Can still be forced on with CLAUDE_CODE_PROFILE_STARTUP=1 environment variable
• Evidence: Xa2 = 0.005 at line 2661, sampling logic at line 2674

What: Added functions to get and set registered hooks in the global state.

Details:

• New kTA() function to set registered hooks (line 2395)
• New vTA() function to get registered hooks (line 2398)
• New jJA() function to access plan slug cache (line 2401)
• Evidence: Functions at lines 2395-2401

• AWS SDK dependencies restructured with consolidated module patterns
• Import changes for child_process module (now uses named imports for spawn and spawnSync)
• Various internal variable and function renames consistent with minification changes