inshellisense

inshellisense is Microsoft's terminal-native autocomplete runtime: as you type in your shell, it offers IDE-style suggestions for commands, flags, and arguments across 600+ command-line tools. It runs as a background runtime hooked into your shell (bash, zsh, fish, pwsh, PowerShell, xonsh, nushell), so completions feel native rather than bolted on.

It is a small, focused, MIT-licensed tool with 10,700 stars and commits as recent as October 2026 — the kind of quality-of-life install that quietly stays. The honest framing: it is spec-driven autocomplete, not AI — suggestions come from command definitions, not a model — so it will not guess your intent the way an LLM copilot would. It also sits in a crowded space (Fig, Carapace, shell-native plugins), and the plugin must be the last line of your shell rc file or it breaks.

1. Install: npm install -g @microsoft/inshellisense (or brew install inshellisense).
2. Run is init once to verify the install (is doctor to diagnose).
3. Hook it into your shell: is init bash >> ~/.bashrc (or the zsh/fish/pwsh equivalent) — keep it as the last line.
4. Start a session with is (or let the shell plugin start it automatically).
5. Type any supported command and accept suggestions inline.