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MCP Installer

MCP Installer

by ZNCOU
OverviewSchemaSourceRelated ServersDiscussionsAdmin

install_repo_mcp_server

Install MCP servers from npm or PyPi to expand Claude's capabilities with external tools using npx or uvx commands.

Instructions

Install an MCP server via npx or uvx

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": {
      "name": "<name>"
    },
    "name": "install_repo_mcp_server"
  }
}

Input Schema

NameRequiredDescriptionDefault
nameYesThe package name of the MCP server
argsNoThe arguments to pass along
envNoThe environment variables to set, delimited by =

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

C2.9/5.0
Behavior2/5

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

With no annotations provided, the description carries full burden but lacks behavioral details. It states the installation action but doesn't disclose critical traits like required permissions, side effects (e.g., system changes), error handling, or output format. This leaves significant gaps for an agent to understand the tool's behavior.

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, efficient sentence with zero waste. It's front-loaded with the core action and methods, making it easy to parse quickly without unnecessary elaboration.

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?

Given the complexity of installing software (a mutation operation with potential side effects), no annotations, and no output schema, the description is incomplete. It lacks details on prerequisites, success/failure outcomes, and behavioral context, making it insufficient for safe and effective tool invocation.

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 all parameters (name, args, env). The description adds no additional meaning beyond what the schema provides, such as examples or usage context for parameters. Baseline 3 is appropriate as the schema handles parameter documentation adequately.

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?

The description clearly states the action ('Install') and resource ('MCP server'), specifying the installation methods ('via npx or uvx'). However, it doesn't differentiate from sibling tools like 'install_local_mcp_server', which likely handles local installations versus this tool's package-based approach.

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 explicit guidance on when to use this tool versus alternatives is provided. The description mentions installation methods but doesn't clarify scenarios where 'install_repo_mcp_server' is preferred over 'install_local_mcp_server' or other siblings, leaving usage context ambiguous.

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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