# Claude Code v2.0.21

> Claude Code v2.0.21, released 16 Oct 2025 (2025-10-16). 3 entries read out of the shipped bundle. Unofficial, and not affiliated with Anthropic.

Web version: https://changelogs.core-directive.com/v/2.0.21

This release improves the plan mode workflow by adding guidance for handling ambiguous requirements, helping Claude better understand when to ask clarifying questions before implementing features.

## Changes

### Enhanced Plan Mode Guidance

**What:** The ExitPlanMode tool now includes comprehensive guidance on handling ambiguous requirements and unclear implementation approaches.

**Details:**

- Added "Handling Ambiguity in Plans" section to help Claude identify when clarification is needed at `OU8() at line 428198`
- Claude will now proactively ask about:
- Multiple valid implementation approaches (e.g., architectural patterns)
- Library or framework choices
- Assumptions that could affect implementation
- Includes a new example demonstrating proper clarification workflow for authentication features
- Claude must now resolve ambiguities before proceeding with implementation

**Impact:** Users will experience fewer instances where Claude makes incorrect assumptions about implementation details. When requirements are unclear, Claude will ask targeted questions to understand the desired approach before writing code.

**Evidence:**

- v2.0.20: Basic ExitPlanMode documentation at `OU8() at line 428188` with 2 examples
- v2.0.21: Enhanced ExitPlanMode documentation at `OU8() at line 428198` with ambiguity handling section and 3 examples

### Improved Signal Handling

**What:** Enhanced initialization sequence to include proper SIGINT/SIGTERM signal handlers for graceful shutdown.

**Details:**

- Added signal handler initialization (`N7()`) to the `uz1` startup function at line 455136
- Ensures proper cleanup when Claude Code is interrupted or terminated
- No user-visible behavior change, but improves reliability

**Evidence:**

- v2.0.20: `uz1` initialization at line 455101 without signal handlers
- v2.0.21: `uz1` initialization at line 455136 now includes `N7()` signal handler

### Code Reorganization

- Internal variable and function renames throughout the codebase (6690 renames total)
- Import statement reorganization for better code structure
- No functional changes to existing features