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ruslanlap

PageSpeed Insights MCP Server

by ruslanlap

get_javascript_analysis

Analyze JavaScript execution to identify bootup time, unused code, and main thread work for web performance optimization.

Instructions

Get JavaScript execution breakdown showing bootup time, unused code, and main thread work

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesThe URL to analyze
strategyNoAnalysis strategymobile
Behavior2/5

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

No annotations exist, and the description only outlines return content without mentioning side effects, authentication needs, or rate limits. The 'get' prefix implies read-only, but this is not explicit.

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

Conciseness5/5

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

Single, front-loaded sentence with no extraneous detail, efficiently stating the tool's purpose and key output fields.

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

Completeness4/5

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

Given the simple parameter set and no output schema, the description sufficiently explains the output, though it could mention response format or limitations for full completeness.

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

Parameters3/5

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

Schema description coverage is 100% with clear parameter descriptions, but the tool description adds no extra meaning beyond what the schema already provides.

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?

The description uses a specific verb 'Get' and resource 'JavaScript execution breakdown', with explicit data points (bootup time, unused code, main thread work), clearly distinguishing it from sibling tools like get_network_analysis.

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 JavaScript analysis but provides no explicit guidance on when to use this tool versus alternatives such as get_full_audit or get_performance_summary.

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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