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contractor-license-mcp-server

by Noquarter6

contractor-license-mcp-server

Verificación de licencias de contratistas en tiempo real en 45 estados de EE. UU. Un servidor MCP que permite a Claude Desktop, Cursor y cualquier agente de IA compatible con MCP verificar la licencia, el estado, la fecha de caducidad y el historial disciplinario de un contratista directamente en los portales de las juntas de licencias estatales.

Envíe {state, license_number, trade} y obtenga la validez, el nombre del titular, la fecha de caducidad, el estado y cualquier acción disciplinaria registrada. Los resultados se obtienen en vivo desde los portales estatales oficiales (sin exportaciones nocturnas obsoletas) y se almacenan en caché durante 24 horas cuando están activos.

Por qué este servidor

  • 45 estados cubiertos a través de portales oficiales de juntas de licencias estatales, no agregadores de datos de terceros

  • Consultas en vivo: cada verificación accede al portal oficial, por lo que las fechas de caducidad y las acciones disciplinarias están tan actualizadas como los propios datos de la junta

  • Verificación por lotes: hasta 25 licencias por llamada, ejecutadas en paralelo

  • Historial disciplinario: se devuelve cuando el portal lo expone

  • Respaldado por TradesAPI, una API HTTP alojada a la que también puede acceder directamente

Related MCP server: license-verifier-mcp

Inicio rápido

Claude Desktop

Agregue esto a su configuración de Claude Desktop:

  • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

  • Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "tradesapi": {
      "command": "npx",
      "args": ["-y", "contractor-license-mcp-server"],
      "env": {
        "CLV_API_URL": "https://www.tradesapi.com",
        "CLV_API_KEY": "your-api-key-here"
      }
    }
  }
}

Reinicie Claude Desktop después de guardar.

Obtención de una clave API

  1. Vaya a www.tradesapi.com y haga clic en Sign up free (Registrarse gratis)

  2. Ingrese su correo electrónico: recibirá un enlace mágico

  3. Haga clic en el enlace y llegará a su panel de control, donde le espera su clave API

Las cuentas nuevas comienzan con 50 créditos de verificación gratuitos, sin necesidad de tarjeta de crédito. Puede comprar paquetes de crédito adicionales desde el panel de control cuando necesite más.

Instalación directa

npm install -g contractor-license-mcp-server

Herramientas

clv_verify_license

Verifica una licencia de contratista individual en un portal de una junta de licencias estatal.

Parámetro

Requerido

Descripción

state

sí

Código de estado de dos letras (CA, TX, FL, ...)

license_number

sí

El número de licencia a verificar

trade

no

general, electrical, plumbing, hvac, mechanical, residential o home_inspection (el valor predeterminado es general)

force_refresh

no

Omite la caché de 24 horas y vuelve a obtener los datos del portal

response_format

no

markdown (predeterminado) o json

Resultado de ejemplo:

## License Verification: VALID

| Field      | Value                    |
|------------|--------------------------|
| Name       | ANDERSON, ORIN RAE       |
| License #  | TACLA00000103C           |
| State      | TX                       |
| Trade      | hvac                     |
| Status     | Active                   |
| Expiration | 05/12/2026               |

clv_batch_verify

Verifica hasta 25 licencias en una sola llamada. Cada verificación se ejecuta de forma independiente: los fallos parciales no bloquean el lote.

Parámetro

Requerido

Descripción

licenses

sí

Matriz de objetos { state, license_number, trade } (1–25 elementos)

response_format

no

markdown (predeterminado) o json

clv_list_supported_states

Enumera todos los estados admitidos, incluidas las URL de los portales y los oficios disponibles. Úselo para ver qué estados y oficios puede consultar.

Parámetro

Requerido

Descripción

response_format

no

markdown (predeterminado) o json

Estados admitidos

Código

Estado

Oficios

AK

Alaska

general, electrical, mechanical

AL

Alabama

general, electrical, plumbing, hvac, residential

AR

Arkansas

general

AZ

Arizona

general, electrical, plumbing, hvac

CA

California

general, electrical, plumbing, hvac

CO

Colorado

electrical, plumbing

CT

Connecticut

general, electrical, plumbing, hvac

DC

Distrito de Columbia

general

DE

Delaware

electrical, plumbing, hvac

FL

Florida

general, electrical, plumbing, hvac

GA

Georgia

general

HI

Hawái

general

IA

Iowa

electrical

ID

Idaho

electrical, plumbing, hvac

IL

Illinois

general, electrical, plumbing, hvac

IN

Indiana

plumbing

KY

Kentucky

general, electrical, hvac, plumbing

LA

Luisiana

general

MA

Massachusetts

general, mechanical

MD

Maryland

general, hvac, electrical, plumbing

ME

Maine

electrical, plumbing

MI

Míchigan

electrical, plumbing, hvac

MN

Minnesota

general, electrical, plumbing

MS

Misisipi

general

NC

Carolina del Norte

general

ND

Dakota del Norte

general, electrical

NE

Nebraska

general, electrical

NH

Nuevo Hampshire

electrical, plumbing

NJ

Nueva Jersey

general, electrical, hvac, plumbing

NM

Nuevo México

general, electrical, plumbing, hvac

NV

Nevada

general, electrical, plumbing, hvac

NY

Nueva York

home_inspection

OH

Ohio

general, electrical, plumbing, hvac

OK

Oklahoma

electrical, plumbing, hvac

OR

Oregón

general

PA

Pensilvania

general, electrical, hvac, plumbing

RI

Rhode Island

general

SC

Carolina del Sur

general, electrical, plumbing, hvac

TN

Tennessee

general, electrical, plumbing

TX

Texas

hvac, electrical, plumbing

UT

Utah

general, electrical, plumbing, hvac

VA

Virginia

general, electrical, plumbing, hvac

VT

Vermont

electrical, plumbing

WA

Washington

general

WV

Virginia Occidental

general, electrical, hvac, plumbing

La cobertura se expande continuamente. Ejecute clv_list_supported_states desde su agente para obtener la lista actual, o consulte la cuadrícula de estados en vivo en www.tradesapi.com.

Configuración

Variable

Requerido

Descripción

CLV_API_URL

sí

URL del backend de la API (use https://www.tradesapi.com)

CLV_API_KEY

sí

Su clave API del panel de control

Créditos

Cada verificación de licencia consume 1 crédito, independientemente de si el resultado es nuevo o está en caché. Las cuentas nuevas reciben 50 créditos gratuitos. Se pueden comprar paquetes de crédito adicionales desde el panel de control en www.tradesapi.com.

Desarrollo

git clone https://github.com/Noquarter6/contractor-license-mcp-server.git
cd contractor-license-mcp-server
npm install
npm run build
npm test

Licencia

MIT

Available Tools

4 tools
clv_batch_verifyA
Read-onlyIdempotent
Inspect

Verify multiple contractor licenses in a single request (max 25). Returns results for each license, with partial failure handling — individual failures don't block others.

ParametersJSON Schema
NameRequiredDescriptionDefault
licensesYesArray of licenses to verify (1-25 items).
response_formatNoResponse format.markdown

TDQS

A4.2/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=true, covering safety and idempotency. The description adds valuable behavioral context beyond annotations: the 25-item maximum limit and partial failure handling where individual failures don't block others. This provides important operational details not captured in annotations.

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 perfectly concise and front-loaded: two sentences that efficiently convey the core functionality (batch verification with limit) and key behavioral trait (partial failure handling). Every word earns its place with zero waste.

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?

Given the tool's moderate complexity (batch operation with partial failures), rich annotations (read-only, non-destructive, idempotent), and 100% schema coverage, the description is mostly complete. The main gap is lack of output schema, so the description doesn't explain return values or format details, but it does mention response format as a parameter.

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 parameters are fully documented in the schema. The description doesn't add any parameter-specific semantics beyond what's in the schema (e.g., it doesn't explain license number formats or trade types). Baseline 3 is appropriate when the schema does the heavy lifting.

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 the tool's purpose: 'Verify multiple contractor licenses in a single request' with a specific maximum (25). It distinguishes from sibling tools by emphasizing batch verification versus single verification (clv_verify_license) or search by name (clv_search_by_name).

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 provides clear context for when to use this tool (batch verification of up to 25 licenses) and mentions partial failure handling, which is useful guidance. However, it doesn't explicitly state when NOT to use it or directly compare it to alternatives like clv_verify_license for single licenses.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

clv_list_supported_statesA
Read-onlyIdempotent
Inspect

List all US states currently supported for contractor license verification, including portal URLs, health status, and available trades.

ParametersJSON Schema
NameRequiredDescriptionDefault
response_formatNoResponse format.markdown

TDQS

A4/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=true, covering safety and idempotency. The description adds valuable context about what data is returned (portal URLs, health status, trades) and the scope ('currently supported'), which helps the agent understand the tool's behavior beyond basic annotations.

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 that front-loads the core purpose and includes all necessary details without redundancy. Every word earns its place, making it appropriately sized for this simple tool.

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?

Given the tool's low complexity (1 optional parameter, no output schema), rich annotations (readOnly, non-destructive, idempotent), and clear purpose, the description is nearly complete. It could slightly improve by mentioning the default response format or when to choose markdown vs. json, but it adequately covers the tool's function and scope.

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%, with the single parameter 'response_format' fully documented in the schema (enum: markdown/json, default: markdown). The description doesn't add any parameter-specific information beyond what the schema provides, so the baseline score of 3 is appropriate.

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 the specific action ('List all US states'), resource ('supported for contractor license verification'), and scope ('including portal URLs, health status, and available trades'). It distinguishes itself from sibling tools like clv_batch_verify, clv_search_by_name, and clv_verify_license by focusing on metadata listing rather than verification operations.

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 context by specifying what information is returned (portal URLs, health status, trades), suggesting it's for discovering available verification options. However, it doesn't explicitly state when to use this tool versus alternatives or mention any prerequisites or exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

clv_search_by_nameA
Read-onlyIdempotent
Inspect

Search for contractors by business or individual name in a state licensing database. Returns matching contractors with license numbers, status, and confidence scores.

ParametersJSON Schema
NameRequiredDescriptionDefault
stateYesTwo-letter US state code (e.g. 'CA', 'TX'). Use clv_list_supported_states to see available states.
nameYesBusiness or individual name to search for in the state licensing database.
tradeNoThe trade/contractor type to filter by (e.g. 'General Contractor', 'Electrical'). Use clv_list_supported_states to see valid values per state.general
limitNoMaximum number of results to return.
response_formatNoResponse format.markdown

TDQS

A4.2/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=true, indicating a safe, non-mutating, repeatable operation. The description adds valuable context beyond this by specifying the database source ('state licensing database') and detailing the return content ('matching contractors with license numbers, status, and confidence scores'), which helps the agent understand the tool's behavior and output format.

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, well-structured sentence that front-loads the core purpose and efficiently lists the return values. There is no wasted verbiage, and every part of the sentence contributes essential information, making it highly concise and clear.

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?

Given the tool's complexity (a search operation with 5 parameters), rich annotations (covering safety and idempotency), and 100% schema coverage, the description is largely complete. It specifies the database source and return content, though without an output schema, it could benefit from more detail on result structure (e.g., pagination or error handling). However, it provides sufficient context for effective use.

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 fully documents all parameters. The description mentions 'business or individual name' and 'state licensing database', which aligns with the schema but doesn't add significant semantic detail beyond it. The baseline score of 3 is appropriate as the schema handles parameter documentation effectively.

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 the specific action ('Search for contractors'), the resource ('in a state licensing database'), and the scope ('by business or individual name'). It distinguishes from siblings like clv_verify_license (which verifies specific licenses) and clv_list_supported_states (which lists states), making the purpose unambiguous and well-differentiated.

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 usage context by specifying 'in a state licensing database' and listing what it returns, but it doesn't explicitly state when to use this tool versus alternatives like clv_batch_verify or clv_verify_license. The input schema references clv_list_supported_states for valid values, providing some guidance, but the description itself lacks explicit when/when-not instructions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

clv_verify_licenseA
Read-onlyIdempotent
Inspect

Verify a contractor's license by checking the state licensing board portal. Returns license validity, holder name, status, expiration, and any disciplinary actions.

ParametersJSON Schema
NameRequiredDescriptionDefault
stateYesTwo-letter US state code (e.g. 'CA', 'TX'). Use clv_list_supported_states to see available states.
license_numberYesThe contractor's license number as shown on their license card. Format varies by state.
tradeNoThe trade/contractor type (e.g. 'General Contractor', 'Electrical'). Use clv_list_supported_states to see valid values per state.general
force_refreshNoBypass cache and fetch fresh data from the state portal.
response_formatNoResponse format.markdown

TDQS

A4.2/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=true, indicating a safe, non-mutating, repeatable operation. The description adds valuable context beyond annotations: it specifies the data source ('state licensing board portal'), mentions caching behavior ('bypass cache' via force_refresh parameter), and lists the specific return fields (e.g., disciplinary actions), enhancing transparency about behavior and output without contradicting annotations.

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, dense sentence that front-loads the core action and resource, followed by a concise list of return values. Every word earns its place, with no redundancy or fluff, making it highly efficient and well-structured for quick comprehension by an AI agent.

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?

Given the tool's moderate complexity (5 parameters, no output schema) and rich annotations (read-only, non-destructive, idempotent), the description is largely complete: it covers purpose, data source, return fields, and caching behavior. However, it lacks details on error handling (e.g., invalid license numbers), rate limits, or authentication requirements, which could be useful for an agent despite the safe annotations. The absence of an output schema means the description must fully explain returns, which it does adequately but not exhaustively.

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%, with each parameter well-documented in the input schema (e.g., state codes, license number format, trade defaults, force_refresh purpose, response_format options). The description does not add significant semantic details beyond the schema, such as explaining parameter interactions or trade-specific nuances. With high schema coverage, the baseline score of 3 is appropriate, as the description relies on the schema for parameter semantics.

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 the specific action ('verify a contractor's license'), resource ('contractor's license'), and scope ('by checking the state licensing board portal'), distinguishing it from sibling tools like clv_batch_verify (batch operations) and clv_search_by_name (search by name). It explicitly mentions the return data (validity, holder name, status, expiration, disciplinary actions), making the purpose highly specific and differentiated.

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 usage context (verifying individual licenses via state portals) and references sibling tools (clv_list_supported_states for valid inputs), providing clear guidance on prerequisites. However, it does not explicitly state when to use this tool versus alternatives like clv_batch_verify (e.g., for single vs. multiple licenses) or clv_search_by_name (e.g., when license number is unknown), missing explicit exclusions or comparisons.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 4 tool updatesv0.6.3
    • First observedclv_batch_verify
    • First observedclv_list_supported_states
    • First observedclv_search_by_name
    • First observedclv_verify_license

TDQS

A4.3/5.0

Scored across 4 tools

Disambiguation5/5

Each tool has a clearly distinct purpose: batch verification, listing supported states, searching by name, and single license verification. There is no overlap in functionality, and an agent can easily differentiate between them based on their specific operations.

Naming Consistency5/5

All tool names follow a consistent 'clv_' prefix and snake_case pattern (e.g., clv_batch_verify, clv_list_supported_states). This uniformity makes the tools predictable and easy to identify within the server's domain.

Tool Count5/5

With 4 tools, the server is well-scoped for contractor license verification, covering key operations like verification, batch processing, state listing, and name searching. Each tool serves a necessary function without redundancy or bloat.

Completeness4/5

The tool set provides strong coverage for core verification workflows, including single and batch checks, state support info, and name searches. A minor gap might be the lack of tools for updating or managing license data, but for a verification-focused server, the surface is largely complete.

Maintenance

ActivityInactive
ResponsivenessNo issues

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