C

Microsoft's lib0xc landed on Hacker News with a practical message: safer systems code often means better C APIs, warnings, bounds checks, and incremental adoption, not a heroic rewrite.

The primary command-line entry point for Claude Code sessions.

Real-time prompt loop with history, completions, and multiline input.

50+ customizable shortcuts for cancel, history, transcript, and more.

Full vim keybindings (normal and insert modes) for prompt editing.

Run Bash commands with Ctrl+B and retrieve output by task ID.

Prefix prompts with ! to run shell commands directly, bypassing Claude.

Per-directory prompt history with Ctrl+R reverse search.

Hold-to-record voice input on macOS, Linux, and Windows.

Shift+Enter, Option+Enter, or backslash+Enter for multi-line prompts.

Context-aware follow-up suggestions derived from git history.

Ask quick side questions without derailing the main task.

Read file contents with line limiting, offset, and binary support.

Create or overwrite files; requires permission for existing paths.

Targeted edits to specific sections without rewriting entire files.

Batch edit multiple files in a single atomic operation.

Modify Jupyter notebook cells directly without touching JSON.

File discovery via pattern matching across the repository.

Search file contents by pattern with regex support.

Jump to definitions, find references, and type-check via language servers.