Servidor MCP para consultar datos de compensación de levels.fyi.
Nombre del servidor: MyPlayground
Herramientas:
calculate_addition(a: int, b: int) -> int
get_mock_weather(city: str) -> str (clima simulado, no datos de API reales)
generate_username(base_name: str, add_numbers: bool = true) -> str
Related MCP server: FastMCP Demo Server
Esta sección es para usuarios que solo desean instalar y ejecutar el servidor MCP en Cursor.
Python >=3.11
Utilice uv run para que Cursor utilice el entorno del proyecto directamente.
{
"mcpServers": {
"user-MyPlayground": {
"command": "uv",
"args": ["run", "python", "main.py"],
"cwd": "/absolute/path/to/levels-fyi-mcp"
}
}
}Abra la configuración de MCP en Cursor y añada la configuración del servidor anterior.
Asegúrese de que cwd apunte a su clon local de este repositorio.
Inicie/recargue los servidores MCP en Cursor.
Llame a herramientas como calculate_addition, get_mock_weather y generate_username.
fastmcpSi prefiere command: "fastmcp" en Cursor, instálelo como una herramienta global:
uv tool install fastmcpSi Cursor no puede encontrar fastmcp, utilice la configuración recomendada uv run anterior.
Esta sección es para colaboradores que trabajan en cambios de código.
Desde la raíz del proyecto:
uv syncuv run python main.pyuv add <package>
uv syncuv run python -c "import fastmcp; print('fastmcp ok')".
├── main.py
├── pyproject.toml
└── README.mdCausa: Cursor no puede encontrar el ejecutable fastmcp.
Solución:
Prefiera la configuración de Cursor con uv run python main.py, o
Instale la herramienta global con uv tool install fastmcp y asegúrese de que PATH incluya el binario de la herramienta uv (normalmente ~/.local/bin).
generate_username.add_numbers debe ser booleano (true/false), no números ni cadenas.
get_mock_weather devuelve datos simulados aleatorios para demostraciones.
Los registros de la herramienta se imprimen desde main.py y aparecen en la salida del servidor.
REQUIRED: Call this tool FIRST to find the company's specific level names (e.g., '63', 'L5', 'E4') versus the industry 'Standard' ladder. 'role' must be the full name: 'Software Engineer', 'Product Manager', etc.
| Name | Required | Description | Default |
|---|---|---|---|
| company_name | Yes | ||
| role | No | Software Engineer |
| Name | Required | Description |
|---|---|---|
No output parameters | ||
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries full burden. It discloses that the tool should be called first (a behavioral trait) but does not mention side effects, permissions, rate limits, or output structure beyond 'find level names'. The lack of behavioral details reduces transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences with no fluff. The first sentence front-loads the requirement and purpose. The second gives a concrete parameter rule. Every word earns its place.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the presence of an output schema (though not shown), the description adequately covers the tool's role as a prerequisite mapping function. It explains the core action and parameter requirements, sufficient for an agent to use it correctly in context with its sibling.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 0%, so description must compensate. It adds meaning for 'role' (must be full name, gives examples) and implies 'company_name' as the company. This provides significant guidance beyond the raw schema, though company_name is not explicitly described.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool's purpose: 'find the company's specific level names versus the industry Standard ladder.' It uses a specific verb 'find' and resource 'level mapping', distinguishing it from the sibling tool 'get_recent_offers'.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description explicitly says 'Call this tool FIRST' and specifies that 'role must be the full name'. It implies a prerequisite relationship to other tools, but does not explicitly state when not to use or provide alternatives.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Fetch the most recent specific salary offers for a given role to gauge current market trends. Example: company_name='Amazon', role='Software Engineer', level='SDE II'
Location must be a single city name (e.g., 'Seattle'). If the city is ambiguous, the most major tech hub will be chosen by default
| Name | Required | Description | Default |
|---|---|---|---|
| company_name | Yes | ||
| role | Yes | ||
| level | Yes | ||
| location | No |
| Name | Required | Description |
|---|---|---|
No output parameters | ||
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries full burden. It mentions location ambiguity handling but fails to disclose any other behavioral traits like data freshness, number of offers returned, or authorization needs.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is two concise sentences plus an example, with no redundant information. It is front-loaded and gets straight to the point.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Despite having an output schema, the description lacks important context such as how 'recent' is defined, the number of offers fetched, and any default behavior for the optional location parameter.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, yet the description only adds meaning for 'location' (single city name) and indirectly for the other parameters through the example. It provides minimal additional semantics beyond the parameter names.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb 'Fetch' and the resource 'specific salary offers' with a purpose 'to gauge current market trends'. It distinguishes from the sibling 'get_level_mapping' by focusing on offers for a given role.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides an example and a note on location format and ambiguity resolution, but does not explicitly state when to use this tool versus alternatives or any prerequisites.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
v1.0.0calculate_additiongenerate_usernameget_level_mappingget_mock_weatherget_recent_offersv0.1.0calculate_additiongenerate_usernameget_mock_weatherScored across 2 tools
The two tools have completely distinct purposes: one maps company-specific levels to standard ladders, the other fetches recent salary offers. No overlap in functionality.
Both tools use a consistent verb_noun pattern in snake_case: get_level_mapping and get_recent_offers, following the same style.
With only 2 tools, the server feels underdeveloped for its likely domain (compensation research). More tools like search by company or role would be expected, but the set is not extreme.
The surface covers level mapping and recent offers but lacks tools for discovering companies, roles, or historical salary trends. Some standard operations are missing, but core use cases are addressed.
Generate synthetic random user data for testing, demos, and development without using real persona.
Generate IDs, QR codes, and hashes, encode values, geolocate IPs, plus gated host diagnostics.
Developer utilities: color conversion, WCAG contrast, timestamps, UUIDs, and hashing.
Geocoding, weather forecasts, and timezone lookups
