Zu built-in tools: web_search, http_fetch, html_parse, render_dom, browser
Project description
zu-tools
Tools — the Tool port: actions the model may take. A tool declares its
tier (the escalation ladder), its JSON schema, a prompt_fragment, and its
capability envelope (capabilities + egress) so its blast radius is
visible in its own code and the gate can bound it.
Registered plugins (zu.tools)
| Name | Class | Tier | Envelope |
|---|---|---|---|
http_fetch |
HttpFetch |
1 | CAP_NET, open egress — a general web fetcher with a host-level SSRF guard (net.check_url). |
html_parse |
HtmlParse |
1 | none — pure CPU on HTML it is handed (least privilege). |
render_dom |
RenderDom |
2 | CAP_NET + CAP_SANDBOX, open egress — renders a URL in a headless browser inside a SandboxBackend (unlocked only after a detector escalates off tier 1). |
The tier ladder
http_fetch and html_parse are tier 1 (cheap, offered from the start).
render_dom is tier 2 — the escalation target when a JavaScript page defeats
tier 1. The loop only offers tools at or below the current tier; a detector
ESCALATE climbs the ladder. The browser runs in a sandbox behind a seam tests
can freeze (a saved rendered page), so the escalation arc is proven offline.
Extend
Implement the Tool shape (see AGENTS.md → Recipe: add a
tool), declare a minimal capabilities/egress, register under zu.tools, and
add a deterministic test (use an httpx.MockTransport to fixture the network).
Tests
uv run pytest packages/zu-tools — offline; the network is fixtured.
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