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contractor-license-mcp-server

by Noquarter6

contractor-license-mcp-server

跨 45 个美国州的实时承包商执照验证。 这是一个 MCP 服务器,允许 Claude Desktop、Cursor 以及任何支持 MCP 的 AI 代理直接针对州许可委员会门户网站验证承包商的执照、状态、有效期和纪律处分记录。

发送 {state, license_number, trade} — 即可获取有效性、持证人姓名、到期日期、状态以及存档的任何纪律处分。结果直接从官方州门户网站实时获取(非过期的每日导出数据),并在激活时缓存 24 小时。

为什么选择此服务器

  • 覆盖 45 个州,通过官方州许可委员会门户网站,而非第三方数据聚合器

  • 实时查询 — 每次验证都会访问权威门户网站,因此到期日期和纪律处分与委员会自身的数据一样新鲜

  • 批量验证 — 每次调用最多可验证 25 个执照,并行运行

  • 纪律处分记录 — 在门户网站公开时返回

  • 由 TradesAPI 提供支持,这是一个您也可以直接调用的托管 HTTP API

Related MCP server: license-verifier-mcp

快速入门

Claude Desktop

将此内容添加到您的 Claude Desktop 配置中:

  • 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"
      }
    }
  }
}

保存后重启 Claude Desktop。

获取 API 密钥

  1. 前往 www.tradesapi.com 并点击 Sign up free

  2. 输入您的电子邮件 — 您将收到一个魔法链接

  3. 点击链接进入您的仪表板,您的 API 密钥就在那里

新账户初始包含 50 个免费验证额度,无需信用卡。当您需要更多额度时,可以从仪表板购买额外的额度包。

直接安装

npm install -g contractor-license-mcp-server

工具

clv_verify_license

针对州许可委员会门户网站验证单个承包商执照。

参数

必需

描述

state

是

两位州代码 (CA, TX, FL, ...)

license_number

是

要验证的执照号码

trade

否

general, electrical, plumbing, hvac, mechanical, residential, 或 home_inspection (默认为 general)

force_refresh

否

跳过 24 小时缓存并从门户网站重新获取

response_format

否

markdown (默认) 或 json

结果示例:

## License Verification: VALID

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

clv_batch_verify

在单次调用中验证最多 25 个执照。每次验证独立运行 — 部分失败不会阻塞整个批次。

参数

必需

描述

licenses

是

{ state, license_number, trade } 对象的数组 (1–25 项)

response_format

否

markdown (默认) 或 json

clv_list_supported_states

列出所有支持的州,包括门户网站 URL 和可用行业。使用此工具查看您可以查询哪些州和行业。

参数

必需

描述

response_format

否

markdown (默认) 或 json

支持的州

代码

州

行业

AK

阿拉斯加州

general, electrical, mechanical

AL

阿拉巴马州

general, electrical, plumbing, hvac, residential

AR

阿肯色州

general

AZ

亚利桑那州

general, electrical, plumbing, hvac

CA

加利福尼亚州

general, electrical, plumbing, hvac

CO

科罗拉多州

electrical, plumbing

CT

康涅狄格州

general, electrical, plumbing, hvac

DC

哥伦比亚特区

general

DE

特拉华州

electrical, plumbing, hvac

FL

佛罗里达州

general, electrical, plumbing, hvac

GA

佐治亚州

general

HI

夏威夷州

general

IA

爱荷华州

electrical

ID

爱达荷州

electrical, plumbing, hvac

IL

伊利诺伊州

general, electrical, plumbing, hvac

IN

印第安纳州

plumbing

KY

肯塔基州

general, electrical, hvac, plumbing

LA

路易斯安那州

general

MA

马萨诸塞州

general, mechanical

MD

马里兰州

general, hvac, electrical, plumbing

ME

缅因州

electrical, plumbing

MI

密歇根州

electrical, plumbing, hvac

MN

明尼苏达州

general, electrical, plumbing

MS

密西西比州

general

NC

北卡罗来纳州

general

ND

北达科他州

general, electrical

NE

内布拉斯加州

general, electrical

NH

新罕布什尔州

electrical, plumbing

NJ

新泽西州

general, electrical, hvac, plumbing

NM

新墨西哥州

general, electrical, plumbing, hvac

NV

内华达州

general, electrical, plumbing, hvac

NY

纽约州

home_inspection

OH

俄亥俄州

general, electrical, plumbing, hvac

OK

俄克拉荷马州

electrical, plumbing, hvac

OR

俄勒冈州

general

PA

宾夕法尼亚州

general, electrical, hvac, plumbing

RI

罗德岛州

general

SC

南卡罗来纳州

general, electrical, plumbing, hvac

TN

田纳西州

general, electrical, plumbing

TX

得克萨斯州

hvac, electrical, plumbing

UT

犹他州

general, electrical, plumbing, hvac

VA

弗吉尼亚州

general, electrical, plumbing, hvac

VT

佛蒙特州

electrical, plumbing

WA

华盛顿州

general

WV

西弗吉尼亚州

general, electrical, hvac, plumbing

覆盖范围持续扩大。从您的代理运行 clv_list_supported_states 以获取当前列表,或在 www.tradesapi.com 查看实时状态网格。

配置

变量

必需

描述

CLV_API_URL

是

API 后端 URL (使用 https://www.tradesapi.com)

CLV_API_KEY

是

您从仪表板获取的 API 密钥

额度

每次执照验证消耗 1 个额度,无论结果是实时的还是缓存的。新账户获得 50 个免费额度。额外的额度包可以从 www.tradesapi.com 的仪表板购买。

开发

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

许可证

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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