React Native Upgrade Helper MCP Server

by KalinYorgov

Overview Schema Source Related Servers Discussions Admin

JavaScript

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Get Specific File Diff

get_file_diff

Fetch file-level differences between React Native versions to see what changed for a specific file during an upgrade.

Instructions

Get specific file differences for React Native upgrade

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": {
      "fromVersion": "<fromVersion>",
      "toVersion": "<toVersion>",
      "fileName": "<fileName>"
    },
    "name": "get_file_diff"
  }
}

Input Schema

Name	Required	Description	Default
`fileName`	Yes	Specific file to get diff for (e.g., "package.json", "android/build.gradle")
`toVersion`	Yes	Target React Native version
`fromVersion`	Yes	Source React Native version
`packageName`	No	Package name	com.example.app
`projectName`	No	Project name	ExampleApp

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.0Aug 2, 2026

TDQS

B3.4/5.0

Behavior2/5

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

There are no annotations provided, so the description carries the full burden of behavioral disclosure. However, it only states 'Get specific file differences' without explaining what the diff looks like, whether it's read-only, or any potential side effects. This is a significant gap in a tool with no annotation support.

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 a single, front-loaded sentence that states the purpose without any filler or redundancy. It is appropriately concise for its simplicity.

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

Completeness2/5

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

With no output schema and no annotations, the description needs to explain return values and behavioral context, but it does not. Given the tool has 5 parameters and one sibling, the description is too lean to be considered adequately complete, especially since it doesn't clarify what the diff output looks like or how it differs from get_upgrade_info.

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?

The schema provides 100% coverage with descriptions for all parameters, so the schema does the heavy lifting. The description adds no additional parameter information beyond what the schema already offers. Baseline of 3 is appropriate when schema coverage is high.

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 'specific file differences', clearly indicating it retrieves diffs for a particular file. The phrase 'for React Native upgrade' adds context, and it distinguishes from the sibling tool get_upgrade_info, which presumably handles general upgrade information.

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 in the React Native upgrade process, but it does not explicitly state when to use this tool versus get_upgrade_info or any exclusions. It provides minimal usage context but no direct alternatives or when-not-to-use guidance.

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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