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cli-discover

cli-discover provides methods to detect installed command-line tools on a host system, retrieve their version information, and verify authentication status. Use this skill when you need to inventory available development tools, determine which cloud provider CLIs are authenticated, or check dependencies before executing automated workflows that require specific tools.

View source Repository: vellum-assistant

Install in Claude Code

Copy

git clone --depth 1 https://github.com/vellum-ai/vellum-assistant /tmp/cli-discover && cp -r /tmp/cli-discover/skills/cli-discover ~/.claude/skills/cli-discover

Then start a new Claude Code session; the skill loads automatically.

Definition

SKILL.md

# CLI Discovery

When you need to discover what CLI tools are available on the system, use `host_bash` to check directly. Do not use sandboxed `bash` for discovery - it may not see host-installed CLIs or auth state, leading to false negatives.

## Checking if a CLI exists

```bash
which <name>        # returns path if found, exits non-zero if missing
command -v <name>   # alternative, works in all POSIX shells
```

## Getting version info

```bash
<name> --version    # most CLIs support this flag
```

Use a 5-second timeout to avoid hanging on unresponsive CLIs.

## Auth-check commands

For CLIs that support authentication, check whether the user is logged in:

| CLI       | Auth check command                                                |
| --------- | ----------------------------------------------------------------- |
| `gh`      | `gh auth status`                                                  |
| `aws`     | `aws sts get-caller-identity`                                     |
| `gcloud`  | `gcloud auth list --filter=status:ACTIVE --format=value(account)` |
| `az`      | `az account show`                                                 |
| `vercel`  | `vercel whoami`                                                   |
| `netlify` | `netlify status`                                                  |
| `fly`     | `fly auth whoami`                                                 |
| `heroku`  | `heroku auth:whoami`                                              |
| `railway` | `railway whoami`                                                  |

## Common CLIs worth checking

When doing a broad discovery, check these categories:

- **Version control & code hosting:** `gh`, `git`, `gitlab`
- **Project management:** `linear`, `jira`
- **Communication:** `slack`
- **Cloud providers:** `aws`, `gcloud`, `az`
- **Containers & infra:** `docker`, `kubectl`, `terraform`
- **Runtimes & package managers:** `node`, `bun`, `deno`, `python3`, `pip3`
- **HTTP clients:** `curl`, `httpie`
- **Hosting & deploy:** `vercel`, `netlify`, `fly`, `heroku`, `railway`

## Output format

Report findings in markdown:

```markdown
## Available CLIs

- **git** (/usr/bin/git) - git version 2.x.x
- **gh** (/usr/bin/gh) - gh version 2.x.x [authenticated: user@example.com]
- **bun** (~/.bun/bin/bun) - 1.x.x

## Not found: jira, linear, slack
```