Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/leon-ai/leon/tiny-web-crawlernpx skills add leon-ai/leon --skill tiny-web-crawlergit clone --depth 1 https://github.com/leon-ai/leonWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00042 | $0.00856 |
| Opus 5 | $0.00021 | $0.00428 |
| Sonnet 5 | $0.00008 | $0.00171 |
| Haiku 4.5 | $0.00004 | $0.00086 |
Grade A, and why
tiny-web-crawler scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tiny Web Crawler
Use this skill to inspect web pages by fetching content, searching within it, and following relevant links from the starting page.
Scripts
Use the bundled scripts for the actual web fetching and bounded crawling:
scripts/fetch-page.mjs: fetch one page, extract compact readable text, links, and query snippets.scripts/crawl-web.mjs: crawl from one or more start URLs, follow relevant links, and stop at limits or strong matches.
Run scripts with node. Leon's shell tool injects runtime shims, so node
uses Leon's managed Node.js binary when available and falls back to PATH only
when the managed binary is missing.
Example:
node scripts/crawl-web.mjs --url "https://example.com" --query "target phrase" --max-pages 8 --max-depth 2
Do not build $LEON_HOME/bin/node/... or /bin/node/... paths manually.
Workflow
- Clarify the target only when the requested information or starting point is ambiguous.
- Start from the owner-provided URL when one is given.
- Use
scripts/crawl-web.mjsto fetch pages, search within content, and follow relevant links. - Use
scripts/fetch-page.mjsfor one-off page inspection or deeper inspection of a promising page. - Start with compact fetches. Read full or later text chunks only when snippets, title, or links show the page is likely relevant.
- Search within fetched content for exact names, phrases, dates, numbers, headings, or nearby synonyms.
- Track visited URLs and do not revisit the same page.
- Stop as soon as the target information is found with enough context to answer.
- If the limit is reached, report what was checked and what remains unresolved.
Limits
Default limits unless the owner specifies otherwise:
- Max pages: 8
- Max link depth from the starting page: 2
- Max pages from the same domain: 5
Prefer stopping early over crawling broadly.
Progressive Fetching
fetch-page.mjs returns compact output by default:
textPreview: short readable previewsnippets: query matches with nearby contextlinks: normalized URLs with short labels and contextchunk.hasMoreandchunk.nextOffset: use these to fetch more text only when needed
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 95 lines · 42 tokens per session scan A a034f66eb774
tiny-web-crawler is a skill published in the GitHub repository leon-ai/leon (17,476 stars, last pushed 7d ago), licensed MIT. It adds 42 tokens to every session and 856 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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