sleight

Drive any CDP browser like a human. Bezier trajectories with real hand tremor, typing rhythm modelled on keystroke-dynamics research, and exclusive leasing for browser instance pools.

Python ≥ 3.11 · one runtime dependency (websocket-client) · MIT

📖 中文文档手册 — 安装、快速开始、实战场景、CloakBrowser Manager 部署

pip install sleight

30 seconds

from sleight import connect, Text

with connect("http://127.0.0.1:9222") as s:      # opens its own tab, closes it on exit
    s.open("https://example.com", wait=Text("Example Domain"))
    print(s.title(), len(s.content()))

With a browser pool that has real profiles behind it:

from sleight.providers import CloakBrowserManager

mgr = CloakBrowserManager("http://127.0.0.1:19000", token="…")

with mgr.lease() as inst:                    # exclusive lease, released on exit
    with inst.session(human=True) as s:      # every action gets a human trajectory
        s.open("https://example.com")
        s.click("#login")
        s.type("#email", "user@example.com")
        s.click("#submit", human=False)      # …except this one, speed matters here

Target one specific profile — by id, by name, or by tag:

with mgr.lease(instance_id="5edcc28a-…") as inst:            ...
with mgr.lease(where=lambda i: i.name == "Win-US-02") as inst: ...
with mgr.lease(where=lambda i: "us" in i.tags) as inst:        ...

Three providers' worth of instances, one logical pool:

from sleight import Pool
from sleight.providers import CloakBrowserManager, Plain

pool = Pool([
    CloakBrowserManager("http://10.0.0.1:9000", token=T1, name="hk"),
    CloakBrowserManager("http://10.0.0.2:9000", token=T2, name="sg"),
    Plain("http://127.0.0.1:9222", name="local"),
])

with pool.lease(where=lambda i: "us" in i.tags) as inst:
    ...

Why this exists

Fingerprint-level anti-detection is a solved problem — CloakBrowser patches Chromium at the source level, Camoufox patches Firefox. They fix what the browser looks like. Nothing fixes how it moves.

• Playwright and Puppeteer teleport the mouse. mouse.move(steps=N) interpolates a straight line at constant speed — zero jitter, zero acceleration. That is itself a signature.
• The browser will not fill in the trajectory for you. Even with a humanize feature enabled browser-side, an external CDP client produces zero mousemove events between press and release. Measured, not assumed.
• The good trajectory work lives in JavaScript (ghost-cursor). Python ports are thinly maintained.
• Crawlee for Python's BrowserPool does not support remote browsers.

sleight fills exactly that gap: Python + remote CDP + human behaviour + instance leasing.

Relationship to Playwright

Not a replacement — a complement. sleight is a driver layer, not a framework. It deliberately does not do iframes/OOPIF, downloads, video, tracing, or a full locator DSL. When you need those, use Playwright.

The interesting part is that you can use both: sleight's human module is sans-io — it emits (method, params, sleep_after) tuples and never touches a socket — so it drives a Playwright CDPSession just as happily as sleight's own transport.

What makes the motion credible

Parameters are not invented. They come from the WindMouse physical model, ghost-cursor's Fitts-law point budgeting, and published keystroke-dynamics measurements (alternating-hand digraphs average 114 ms, same-hand-different-finger 131 ms, same-finger slowest and most variable).

Scope

Does: navigation and typed wait conditions · rendered-DOM reads · CSS queries · human mouse / keyboard / wheel · instance discovery across providers · cooperative exclusive leasing with TTL renewal · idempotent recovery.

Does not: data extraction · scheduling and queues · fingerprint spoofing (that is the browser's job) · iframe / OOPIF / Shadow DOM piercing · strict fencing · WebDriver BiDi · Firefox.

Status

0.1.0a1 — alpha, the API will move. Every release documents its breaking changes.

License

MIT