# Claude Code v2.0.20

> Claude Code v2.0.20, released 16 Oct 2025 (2025-10-16). 12 entries read out of the shipped bundle. Unofficial, and not affiliated with Anthropic.

Web version: https://changelogs.core-directive.com/v/2.0.20

Version 2.0.20 brings significant improvements to plugin management, hook execution visibility, and CLI automation capabilities. The most notable additions include new CLI commands for managing plugins (`install`, `uninstall`, `enable`, `disable`), full implementation of the Skill tool for executing skills directly from conversations, and enhanced real-time feedback during hook execution with detailed progress tracking.

## Changes

### Plugin Management CLI Commands

**What:** Four new commands for managing plugins directly from the command line

**How to use:**

`# Install a plugin from a marketplace claude plugin install <plugin-name> claude plugin install <plugin-name>@<marketplace> # Uninstall a plugin claude plugin uninstall <plugin-name> # Enable a previously disabled plugin claude plugin enable <plugin-name> # Disable an installed plugin claude plugin disable <plugin-name>` **Details:**

- Commands support aliases: `install` → `i`, `uninstall` → `remove`
- Installation automatically searches configured marketplaces
- Telemetry tracks CLI plugin operations separately from UI operations
- **Evidence**: `zSQ()` at line 465305, `CSQ()` at line 465337, `USQ()` at line 465355, `$SQ()` at line 465370

### Skill Tool (Full Implementation)

**What:** Complete implementation of the Skill tool, enabling Claude to execute skills and commands directly during conversations (previously existed only as a stub)

**How to use:** Skills are invoked automatically by Claude when appropriate, or you can configure permission rules:

`# In .claude/settings.local.json { "permissions": { "allow": { "Skill": ["pdf", "xlsx", "custom-skill:*"] } } }` **Details:**

- Supports both mode commands (high-priority) and regular skills
- Includes intelligent token budgeting (15,000 character default via `SLASH_COMMAND_TOOL_CHAR_BUDGET`)
- Permission system with wildcard patterns (e.g., `skill-name:*`)
- Skills are categorized by source: project, user, plugin, or managed
- Mode commands receive priority and full token allocation
- **Evidence**: `Mo1` initialization at line 429046, `W$Q()` prompt generator at line 428983, `nw` variable at line 428903

### Hook Execution Progress Display

**What:** Real-time visual feedback showing hook execution progress during tool operations

**How to use:** Progress appears automatically when hooks are running:

`Running PreToolUse hooks… (3/5 done) · pre-validate: npm run lint · security-check: ./scripts/check-secrets.sh · backup: git stash` **Details:**

- Shows hook event name (e.g., "PreToolUse", "PostToolUse")
- Displays progress counter when multiple hooks run
- Verbose mode shows individual hook names and commands being executed
- Progress UI disappears when all hooks complete
- **Evidence**: `mi1()` at line 366839, `LR5()` at line 366871, `CoB()` at line 455699, `UoB()` at line 455708, `n48()` at line 384434

### Context Usage Markdown Export

**What:** Export detailed context usage statistics as markdown tables for non-interactive sessions

**How to use:**

`# Run context command in non-interactive mode claude --output text context # Output includes markdown tables: # - Categories (with tokens and percentages) # - MCP Tools # - Custom Agents # - Memory Files # - SlashCommand Tool statistics` **Details:**

- Token counts formatted for readability (e.g., "1.5k" instead of "1500")
- Includes model information and total usage percentage
- Shows free space and autocompact buffer separately
- Agent sources identified (Built-in, Project, User, Local, Flag, Policy, Plugin)
- **Evidence**: `Ma6()` at line 301494, `rk()` token formatter at line 301491

### Project-Level MCP Server Configuration

**What:** Refactored project MCP server configuration loading into a dedicated function with enhanced scope handling

**How to use:** Create `.mcp.json` in your project root:

`{ "mcpServers": { "project-server": { "command": "node", "args": ["./server.js"] } } }` **Details:**

- Dedicated function for loading project MCP configuration
- Proper error collection and reporting
- Supports environment variable expansion
- Explicitly scoped as "project" configuration
- **Evidence**: `dR0()` at line 280421

### Configurable Autocompact Threshold

**What:** Override the default autocompact threshold using an environment variable

**How to use:**

`# Set autocompact to trigger at 75% of context capacity export CLAUDE_AUTOCOMPACT_PCT_OVERRIDE=75 claude # Or inline CLAUDE_AUTOCOMPACT_PCT_OVERRIDE=90 claude` **Details:**

- Accepts percentage values from 1-100
- Falls back to default if invalid value provided
- Provides more control over memory management
- Useful for balancing context usage vs. compaction frequency
- **Evidence**: `Gn6()` at line 296137

### GitHub Action Entrypoint Detection

**What:** Automatic detection when Claude Code runs as a GitHub Action

**How to use:** Set the environment variable in your GitHub workflow:

`- name: Run Claude Code env: CLAUDE_CODE_ACTION: true run: claude -p "Review this PR"` **Details:**

- Accepts flexible values: "1", "true", "yes", "on" (case-insensitive)
- Sets entrypoint to "claude-code-github-action" for proper telemetry
- Enables GitHub Action-specific behavior and logging
- **Evidence**: `yT8()` at line 469210, `jA()` validation at line 3336

### Enhanced Bash Security Checks

**What:** Improved detection of backtick command substitution with escape-aware parsing

**Details:**

- Dedicated `CV6()` function properly handles escaped characters
- Backtick checks now execute before other pattern matching
- More accurate detection prevents false positives from escaped backticks
- **Evidence**: `CV6()` at line 205030, `RV6()` at line 205296

### Terminal Output Performance

**What:** Optimized terminal rendering with synchronized updates

**Details:**

- Reduced function complexity in `d50()` at line 71278 (previously `U50()`)
- Removed separate stderr handling for improved performance
- Simplified output buffering logic
- All output now uses synchronized update sequences

### Autocompact Function Signature

**What:** Simplified autocompact summary function parameters

**Details:**

- Added `hasAppendSystemPrompt` parameter to `pi0()` at line 434307 (previously `Ei0()`)
- Better context awareness during compaction operations
- More precise token counting for system prompts

### Permission Checking Function

**What:** Enhanced tool permission checking with additional context parameter

**Details:**

- Updated `_M()` permission checker at line 458051 (previously `wM()`)
- Added fourth parameter for improved context handling
- More robust permission decision-making

## Internal Changes

- Removed stub Skill tool implementation (`ld0` at v2.0.19:410872)
- Removed deprecated hook progress renderer (`aO5` at v2.0.19:366835, `sO5` at v2.0.19:366851)
- Removed unused clear terminal function (`ji2` at v2.0.19:208933)
- Removed empty placeholder functions (`RLQ`, `LRQ`, `eOQ`)
- Added PassThrough stream import for improved stream handling
- Added execSync and spawn imports for child process management
- Refactored Skills loading with enabled state check (function `tw8()` at line 450050)
- Added helper functions for plugin name parsing and matching (`HSQ()` at line 465275, `ms0()` at line 465282, `us0()` at line 465264)
- Added error handler `Ue1()` at line 465298 for plugin CLI operations
- Multiple variable initializations refactored for improved lazy loading