WebView Touch & Scroll Debugger Agent Skill

Diagnoses and resolves touch and scroll leakage issues between mobile WebViews and native containers alongside JSBridge debugging.

Context cost
3k tokensestimated from the bundle, loaded when it triggers
Bundle
2 files · 11.9 kBtext throughout, nothing executable
Licence
not declarednone named by its author
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Diagnose and fix touch/scroll leakage between a WebView page (popup, drawer, nested scroll container) and its native host container on mobile (especially Android), and troubleshoot @hupu/api-bridge (or similar JSBridge) native calls that crash or silently no-op. Use when a modal/popup's internal scroll drags the underlying native list, a bridge method call causes a white screen, a bridge method appears to do nothing, or the user asks whether a scroll/gesture bug can be fixed in H5 versus needs native client cooperation.

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

debuggingmobile

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md11.1 kB · preview
--- name: webview-touch-scroll-debug ---
6# WebView 触摸/滚动穿透与 Bridge 调用排查
7
8移动端 H5 页面(尤其是被原生容器承载的 WebView,比如直播间/详情页里嵌的功能 tab)常见两类问题:① 弹窗/抽屉内部滚动会带动外部原生容器一起滚(安卓尤其常见);② 调用 @hupu/api-bridge(或同类 JSBridge)的原生方法时报错、白屏,或调用了但没有任何效果。这两类问题的排查思路和已验证有效的修复模式如下。
9
10## 一、判断这是不是 H5 能解决的问题(先判断天花板,别瞎猜)
11
12**核心事实**:如果外层原生容器在 Android View 层实现了 NestedScrollingParent 协议(很多带"头部收起联动"的原生页面都是这么做的),"要不要拦截这次触摸"这个决策的一部分发生在原生 ViewGroup.onInterceptTouchEvent()——这一步跑在 WebView 收到触摸事件**之前**。也就是说,原生父容器可能在 JS 完全看不到这次触摸的情况下就把它抢走了。这种情况下无论 JS/CSS 怎么 preventDefault() 都够不着,因为 WebView 内部合成器压根没拿到这个事件。
13
14**判断方法**:
151. 先按下文"二、三"把 JS/CSS 侧能做的都做完、验证过(不要在验证之前就下结论"H5搞不定")。
162. 如果做完之后,真机上滚动依旧穿透,且穿透行为和"手指起手瞬间就被原生拿走、页面内容本身几乎不动"这种现象吻合(而不是"滚到边界后才穿透"),基本可以判定是原生层拦截,不是 JS 时序问题。
173. 到这一步应该直接跟客户端同学确认两件事,而不是继续在 H5 侧猜:
18 - 这个 WebView 的宿主容器有没有在自己的触摸拦截逻辑里正确处理 requestDisallowInterceptTouchEvent(Android WebView 标准实现通常会在自己判定"内部消费了这次滚动"时自动调用这个方法告诉父容器别抢;如果外层容器是定制过的手势逻辑,可能压根没走这条标准链路)。
19 - 有没有一个专门的 bridge 方法,让 web 侧在某个 UI 状态下(比如弹窗打开)明确告诉原生"这段时间别抢我的手势",并确认这个方法客户端**真的实现了**(不要凭方法名猜,见下文"四"的教训)。
20
21## 二、JS 滚动锁的正确实现方式
22
23参照 antd-mobile v5 useLockScroll(移植自 vant)的思路,核心是:弹窗打开期间在 document 级监听 touchmove,判断触点是否在允许滚动的区域内、以及是否已经到达滚动边界,决定要不要 preventDefault()。
24
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md551 words
Files2
Licencenot declared
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈140
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
2,835
on trigger
The instruction body and 1 supporting file, read only when the skill fires.
1.5%
of a 200k window
Ten skills this size would take about 15% of the window before you open a file.
050k100k150k200k context window

3k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Middling. Fine to keep on in a project where you use it weekly, worth unloading in one where you never do.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

2 files, 11.9 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md11.1 kB
  • README.md0.8 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 2 files you can review in full before installing.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# WebView Touch & Scroll Debugger · 3k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/webview-touch-scroll-debugger/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/webview-touch-scroll-debugger" ] && { [ ! -e .claude/skills/webview-touch-scroll-debugger ] || { mv .claude/skills/webview-touch-scroll-debugger "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/webview-touch-scroll-debugger" .claude/skills/ && echo "Installed .claude/skills/webview-touch-scroll-debugger"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add letern1ty/webview-touch-scroll-debugger

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/webview-touch-scroll-debugger/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/webview-touch-scroll-debugger/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/webview-touch-scroll-debugger" ] && { [ ! -e ~/.claude/skills/webview-touch-scroll-debugger ] || { mv ~/.claude/skills/webview-touch-scroll-debugger "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/webview-touch-scroll-debugger" ~/.claude/skills/ && echo "Installed ~/.claude/skills/webview-touch-scroll-debugger" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/webview-touch-scroll-debugger/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where. It appears as webview-touch-scroll-debug in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, webview-touch-scroll-debugger.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referenceletern1ty/webview-touch-scroll-debugger

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

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