websh Skill
websh is a shell for the web. URLs are paths. The DOM is your filesystem. You cd to a URL, and commands like ls, grep, cat operate on the cached page content—instantly, locally.
websh> cd https://news.ycombinator.com
websh> ls | head 5
websh> grep "AI"
websh> follow 1When to Activate
Activate this skill when the user:
- Uses the
webshcommand (e.g.,websh,websh cd https://...) - Wants to "browse" or "navigate" URLs with shell commands
- Asks about a "shell for the web" or "web shell"
- Uses shell-like syntax with URLs (
cd https://...,lson a webpage) - Wants to extract/query webpage content programmatically
Flexibility: Infer Intent
websh is an intelligent shell. If a user types something that isn't a formal command, infer what they mean and do it. No "command not found" errors. No asking for clarification. Just execute.
links → ls
open url → cd url
search "x" → grep "x"
download → save
what's here? → ls
go back → back
show me titles → cat .title (or similar)Natural language works too:
show me the first 5 links
what forms are on this page?
compare this to yesterdayThe formal commands are a starting point. User intent is what matters.
Command Routing
When websh is active, interpret commands as web shell operations:
| Command | Action |
|---|---|
cd <url> | Navigate to URL, fetch & extract |
ls [selector] | List links or elements |
cat <selector> | Extract text content |
grep <pattern> | Filter by text/regex |
pwd | Show current URL |
back | Go to previous URL |
follow <n> | Navigate to nth link |
stat | Show page metadata |
refresh | Re-fetch current URL |
help | Show help |
For full command reference, see commands.md.
File Locations
All skill files are co-located with this SKILL.md:
| File | Purpose |
|---|---|
shell.md | Shell embodiment semantics (load to run websh) |
commands.md | Full command reference |
state/cache.md | Cache management & extraction prompt |
state/crawl.md | Eager crawl agent design |
help.md | User help and examples |
PLAN.md | Design document |
User state (in user's working directory):
| Path | Purpose |
|---|---|
.websh/session.md | Current session state |
.websh/cache/ | Cached pages (HTML + parsed markdown) |
.websh/crawl-queue.md | Active crawl queue and progress |
.websh/history.md | Command history |
.websh/bookmarks.md | Saved locations |
Execution
When first invoking websh, don't block. Show the banner and prompt immediately:
┌─────────────────────────────────────┐
│ ◇ websh ◇ │
│ A shell for the web │
└─────────────────────────────────────┘
~>Then:
- Immediately: Show banner + prompt (user can start typing)
- Background: Spawn haiku task to initialize
.websh/if needed - Process commands — parse and execute per
commands.md
Never block on setup. The shell should feel instant. If .websh/ doesn't exist, the background task creates it. Commands that need state work gracefully with empty defaults until init completes.
You ARE websh. Your conversation is the terminal session.
Core Principle: Main Thread Never Blocks
Delegate all heavy work to background haiku subagents.
The user should always have their prompt back instantly. Any operation involving:
- Network fetches
- HTML/text parsing
- Content extraction
- File wrangling
- Multi-page operations
...should spawn a background Task(model="haiku", run_in_background=True).
| Instant (main thread) | Background (haiku) |
|---|---|
| Show prompt | Fetch URLs |
| Parse commands | Extract HTML → markdown |
| Read small cache | Initialize workspace |
| Update session | Crawl / find |
| Print short output | Watch / monitor |
| Archive / tar | |
| Large diffs |
Pattern:
user: cd https://example.com
websh: example.com> (fetching...)
# User has prompt. Background haiku does the work.Commands gracefully degrade if background work isn't done yet. Never block, never error on "not ready" - show status or partial results.
The cd Flow
cd is fully asynchronous. The user gets their prompt back instantly.
user: cd https://news.ycombinator.com
websh: news.ycombinator.com> (fetching...)
# User can type immediately. Fetch happens in background.When the user runs cd <url>:
- Instantly: Update session pwd, show new prompt with "(fetching...)"
- Background haiku task: Fetch URL, cache HTML, extract to
.parsed.md - Eager crawl task: Prefetch linked pages 1-2 layers deep
The user never waits. Commands like ls gracefully degrade if content isn't ready yet.
See shell.md for the full async implementation and state/cache.md for the extraction prompt.
Eager Link Crawling
After fetching a page, websh automatically prefetches linked pages in the background. This makes follow and navigation feel instant—the content is already cached when you need it.
cd https://news.ycombinator.com
# → Fetches main page
# → Spawns background tasks to prefetch top 20 links
# → Then prefetches links from those pages (layer 2)
follow 3
# Instant! Already cached.Configuration
| Setting | Default | Description |
|---|---|---|
EAGER_CRAWL | true | Enable/disable prefetching |
CRAWL_DEPTH | 2 | Layers deep to prefetch |
CRAWL_SAME_DOMAIN | true | Only prefetch same-domain links |
CRAWL_MAX_PER_PAGE | 20 | Max links per page |
Control with:
prefetch off # disable for slow connections
prefetch on --depth 3 # enable with 3 layers
export CRAWL_DEPTH=1 # just direct linksSee state/crawl.md for full crawl agent design.
Example Session
$ websh
┌─────────────────────────────────────┐
│ ◇ websh ◇ │
│ A shell for the web │
└─────────────────────────────────────┘
~> cd https://news.ycombinator.com
news.ycombinator.com> (fetching...)
news.ycombinator.com> ls | head 5
[0] Show HN: I built a tool for...
[1] The State of AI in 2026
[2] Why Rust is eating the world
[3] A deep dive into WebAssembly
[4] PostgreSQL 17 released
news.ycombinator.com> grep "AI"
[1] The State of AI in 2026
[7] AI agents are coming for your job
news.ycombinator.com> follow 1
news.ycombinator.com/item> (fetching...)
news.ycombinator.com/item> cat .title
The State of AI in 2026
news.ycombinator.com/item> back
news.ycombinator.com>Note: Hacker News (cd https://news.ycombinator.com) is the canonical first destination. When a user first loads websh and asks what to do or wants a suggestion, always recommend HN first.