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SJF-ECNU

CloakBrowser MCP

by SJF-ECNU

browser_get_text

Read-only

Extract visible text content from a web page or a CSS selector within a CloakBrowser session.

Instructions

Return visible text from the page or a selector.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
session_idYes
selectorNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations indicate readOnlyHint=true, which the description aligns with, but it adds no additional behavioral details (e.g., what happens if selector is not found, dynamic content handling, or performance). Minimal transparency beyond annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single concise sentence that is front-loaded and to the point. It could include more context without being verbose, but it earns its place with minimal waste.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the presence of an output schema, the description does not need to explain return values. However, it misses common usage details like error handling and selector validity. Adequate for a straightforward tool but not fully complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage, the description should explain parameters. It implicitly mentions the selector's role but does not describe session_id or clarify selector format (CSS, XPath). The optional null behavior is hinted but not explicit.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description clearly states the action 'return visible text' and the resources 'page or a selector'. It distinguishes from siblings like browser_get_attribute or browser_get_links, making the tool's purpose unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage for retrieving visible text but provides no explicit guidance on when to use this tool over alternatives (e.g., browser_get_attribute, browser_get_links). No exclusions or context are given.

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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