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react-render-profile-mcp

react-render-profile-mcp

by vola-trebla
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TypeScript
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analyze_compiler_efficacy

Evaluate React Compiler or manual React.memo by tracking spurious renders and calculating an Invalidation Index to identify unstable prop references causing wasteful renders.

Instructions

Evaluates React Compiler or manual React.memo efficacy by tracking spurious renders. Calculates the Invalidation Index for each component to identify where unstable prop references trigger wasteful renders.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "profile_path": "<profile_path>"
    },
    "name": "analyze_compiler_efficacy"
  }
}

Input Schema

NameRequiredDescriptionDefault
profile_pathYesAbsolute path to the React DevTools Profiler export (.json)
invalid_thresholdNoMinimum invalidation index threshold to report (default: 10)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.2

TDQS

A4.2/5.0
Behavior4/5

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

Since no annotations are provided, the description carries the burden of explaining behavior. It does so by stating that it tracks spurious renders and calculates the Invalidation Index per component, giving insight into the analysis process. It does not explicitly mention side effects, but as a pure analysis tool consuming a file, this is acceptable context.

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?

The description is only two sentences, front-loaded with the primary action, and every clause carries substantial meaning. There is no redundant or filler content, making it an exemplar of concise structure.

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?

With only two simple parameters and no output schema, the description adequately conveys what the tool computes and the context (React DevTools profile). It describes the Invalidation Index concept and the input source. It could be more explicit about the return format, but the phrase 'for each component' implies a per-component result, providing sufficient 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 coverage is 100%, so the baseline is 3. The description indirectly references the profile input ('tracking spurious renders') and the threshold concept ('wasteful renders'), but it adds no detail beyond the schema's own descriptions. The schema already labels both parameters clearly, so the description does not enhance parameter understanding.

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 clearly states a specific action ('Evaluates', 'Calculates') on a well-defined resource (React Compiler/manual React.memo efficacy, Invalidation Index). It distinguishes itself from sibling tools by focusing on efficacy evaluation via a calculated metric, not merely finding or suggesting memoization.

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

Usage Guidelines4/5

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

The description implies a clear context: use this when you have a React DevTools Profiler export (profile_path) and want to evaluate compiler/memo efficacy. It does not explicitly name alternatives or exclusion cases, but the intended use case is evident enough that an agent can infer when this tool is appropriate.

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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