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NicolasET

MCP PageSpeed Insights

by NicolasET

Get Third-Party Impact

get_third_party_impact

Analyze third-party script impact for a URL by showing loaded providers, transfer sizes, and main thread blocking time to identify facade opportunities.

Instructions

Get third-party script impact analysis for a URL. Shows which third-party providers are loaded, their transfer sizes, main thread blocking time, and facade opportunities to defer loading.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesThe full URL to analyze (e.g., https://example.com)
strategyNoDevice strategy for the analysismobile

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.4/5.0
Behavior3/5

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

No annotations are provided, so the description carries the full behavioral burden. It usefully describes the analysis output (which providers load, transfer sizes, main-thread blocking time, facade opportunities), which matters because no output schema exists. However, it omits authentication requirements, rate limits, and any explicit read-only or side-effect profile, leaving gaps for a tool with zero annotation coverage.

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?

Two tight sentences: the first states the purpose and scope, the second lists the return content. It is front-loaded and every clause earns its place with no filler.

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?

For a simple two-parameter read-only analytics tool with no output schema, the description explains what the tool does and what the analysis returns. It is nearly complete, though it does not clarify strategy parameter behavior or safety context, which is largely acceptable given the 'Get' naming and full schema coverage.

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%, so the schema already documents both parameters including the strategy enum and default. The description only mentions 'for a URL' and adds no format, constraint, or interpretation details beyond what the schema provides. Baseline 3 is appropriate.

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

Purpose4/5

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

States a specific verb 'Get' and resource 'third-party script impact analysis for a URL', and names the concrete outputs (providers, transfer sizes, blocking time, facade opportunities). It distinguishes its scope from siblings like get_network_analysis and get_js_analysis, but does not explicitly differentiate itself from those alternatives.

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

Usage Guidelines2/5

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

No when-to-use or when-not-to-use guidance is provided. It does not mention prerequisites, alternatives, or conditions under which an agent should choose get_network_analysis or get_render_blocking instead. Usage is only implied by the tool's purpose.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.