Detect overlay elements on web pages, including popups and cookie banners, by analyzing z-index and coverage area. Returns a list with suggestions for removal or adjustment.
遮挡物检测 - 在 DOM 层面自动检测页面上的遮挡元素（弹窗、Cookie横幅、浮层、色块遮挡等），分析 z-index、position、覆盖面积等属性，返回遮挡物列表和建议
| Name | Required | Description | Default |
|---|---|---|---|
| format | No | 输出格式：json（默认结构化数据）或 html（HTML 报告） | json |
Changes observed during successful MCP inspections. Dates show when Glama detected each change.
v1.9.5v1.9.1v1.8.5Output schema / (root)Previous value: -{
- "properties": {
- "hasBlockingOverlay": {
- "type": "boolean"
- },
- "nextSteps": {
- "items": {
- "type": "string"
- },
- "type": "array"
- },
- "overlays": {
- "items": {
- "properties": {
- "className": {
- "type": "string"
- },
- "coveragePercent": {
- "type": "number"
- },
- "id": {
- "type": "string"
- },
- "opacity": {
- "type": "number"
- },
- "overlayType": {
- "type": "string"
- },
- "position": {
- "type": "string"
- },
- "rect": {
- "type": "object"
- },
- "tagName": {
- "type": "string"
- },
- "text": {
- "type": "string"
- },
- "zIndex": {
- "type": "number"
- }
- },
- "type": "object"
- },
- "type": "array"
- },
- "paidUpgradeHint": {
- "type": "string"
- },
- "status": {
- "enum": [
- "success",
- "warning"
- ],
- "type": "string"
- },
- "suggestions": {
- "items": {
- "type": "object"
- },
- "type": "array"
- },
- "totalCoveragePercent": {
- "type": "number"
- },
- "totalOverlays": {
- "type": "number"
- },
- "typeCounts": {
- "type": "object"
- },
- "viewportInfo": {
- "type": "object"
- }
- },
- "type": "object"
-}New value: +nullv1.2.1Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description covers basic behavior (detection and analysis) but does not disclose side effects, permissions, or limitations. It adequately describes the main function.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single concise sentence that is front-loaded with the tool's purpose. It is appropriately sized with no redundant text.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (one parameter, no output schema), the description sufficiently explains what the tool does and what output options exist. It could mention working on the current page but that is implied.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% with one parameter (format) having a default and enum. The description does not add meaning beyond the schema, so baseline score applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool detects occluding elements (popups, cookie banners, overlays) at the DOM level, analyzing properties like z-index and coverage. It distinguishes itself from siblings like browser_overlay_dismiss and browser_visual_check.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No explicit when-to-use or when-not-to-use guidance is provided; the description implies usage for overlay detection but does not exclude alternatives or mention context.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
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