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perfonext-render-mcp

perfonext-render-mcp

by souvikdu
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
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Load Render Profile

load_render_profile

Load an exported React DevTools Profiler JSON to start render performance analysis. Returns a profileId for inspecting rerender storms, commit spikes, and slow components.

Instructions

Load a React DevTools Profiler JSON export. This is the entry point for the manual profiling path: open React DevTools in the browser → Profiler tab → Record → interact → Stop → Export JSON → share the file path here. Returns a profileId for use with get_render_summary, get_slow_components, get_rerender_causes, and the other analysis tools.

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": {
      "filePath": "<filePath>"
    },
    "name": "load_render_profile"
  }
}

Input Schema

NameRequiredDescriptionDefault
filePathYesAbsolute or relative path to the exported React Profiler JSON file

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.5.2

TDQS

A4.3/5.0
Behavior4/5

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

With no annotations, the description carries the full burden. It discloses the operation type (load), the input (file path), the output (profileId), and how that output is used by other tools. It does not discuss failure modes or side effects, but for a load tool this is arguably sufficient transparency.

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 concise sentences: the first states the core function, the second provides a clear step-by-step workflow and return-value context. No redundant phrasing or fluff.

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

Completeness5/5

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

The description fully covers how this tool fits into the larger workflow, what input is needed, and what output to expect. Given the tool has a single parameter and no output schema, all essential information is present for an agent to invoke it correctly.

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 schema already documents filePath as an absolute or relative path. The description adds minimal extra meaning ('share the file path here'), staying at the baseline of 3 since the parameter semantics are adequately covered by the schema.

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 ('Load') and resource ('React DevTools Profiler JSON export'), and clearly identifies the tool as 'the entry point for the manual profiling path.' It distinguishes itself from sibling analysis and capture tools by specifying this is the import step that produces a profileId.

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 gives explicit workflow context ('open React DevTools... Export JSON → share the file path here') and lists the downstream analysis tools. It does not explicitly state when not to use this tool or name an alternative for automated capture, but the manual-path framing makes the intended usage clear.

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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