English Français العربية

Sezzlee SQL Server

Official registry Data and databases

Explore and query Microsoft SQL Server read-only: catalogue search, schema and bounded queries.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package @sezzlee/mssql-mcp
Claude Code 
claude mcp add sezzlee-sql-server -e 'SEZZLEE_MSSQL_SERVER=<SEZZLEE_MSSQL_SERVER>' -e 'SEZZLEE_MSSQL_PORT=1433' -e 'SEZZLEE_MSSQL_DATABASE=<SEZZLEE_MSSQL_DATABASE>' -e 'SEZZLEE_MSSQL_USER=<SEZZLEE_MSSQL_USER>' -e 'SEZZLEE_MSSQL_PASSWORD=<your sezzlee_mssql_password>' -e 'SEZZLEE_MSSQL_ENCRYPT=true' -e 'SEZZLEE_MSSQL_TRUST_SERVER_CERTIFICATE=false' -e 'SEZZLEE_MSSQL_CONNECT_TIMEOUT_MS=15000' -e 'SEZZLEE_MSSQL_QUERY_TIMEOUT_MS=30000' -- npx -y @sezzlee/mssql-mcp@0.2.1
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "sezzlee-sql-server": {
            "command": "npx",
            "args": [
                "-y",
                "@sezzlee/mssql-mcp@0.2.1"
            ],
            "env": {
                "SEZZLEE_MSSQL_SERVER": "<SEZZLEE_MSSQL_SERVER>",
                "SEZZLEE_MSSQL_PORT": "1433",
                "SEZZLEE_MSSQL_DATABASE": "<SEZZLEE_MSSQL_DATABASE>",
                "SEZZLEE_MSSQL_USER": "<SEZZLEE_MSSQL_USER>",
                "SEZZLEE_MSSQL_PASSWORD": "<your sezzlee_mssql_password>",
                "SEZZLEE_MSSQL_ENCRYPT": "true",
                "SEZZLEE_MSSQL_TRUST_SERVER_CERTIFICATE": "false",
                "SEZZLEE_MSSQL_CONNECT_TIMEOUT_MS": "15000",
                "SEZZLEE_MSSQL_QUERY_TIMEOUT_MS": "30000"
            }
        }
    }
}

Environment variables

  • SEZZLEE_MSSQL_SERVER required Database host
  • SEZZLEE_MSSQL_PORT Database port
  • SEZZLEE_MSSQL_DATABASE required Database name
  • SEZZLEE_MSSQL_USER required Login of a read-only principal
  • SEZZLEE_MSSQL_PASSWORD required secret Password of that login
  • SEZZLEE_MSSQL_ENCRYPT Encrypt the connection
  • SEZZLEE_MSSQL_TRUST_SERVER_CERTIFICATE Accept an unverified server certificate
  • SEZZLEE_MSSQL_CONNECT_TIMEOUT_MS Connect timeout in milliseconds
  • SEZZLEE_MSSQL_QUERY_TIMEOUT_MS Query timeout in milliseconds

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Sezzlee MCP
  2. Why
  3. Quick start
  4. Packages
  5. How the HTTP catalog works
  6. Documentation
  7. License

Sezzlee MCP

Swagger for agents. Sezzlee turns what you already have — an HTTP backend, a folder of spreadsheets, PDF and XML documents — into tools an AI agent can find and call over the Model Context Protocol.

It comes in two shapes:

  • The HTTP catalog embeds in a NestJS backend. It exposes your endpoints as a search-first tool catalog and replays every agent call through your backend's own request pipeline, so your authentication, authorization and validation apply unchanged. For a backend on any other stack, an OpenAPI gateway builds the same catalog from its document.
  • Source servers are standalone, read-only MCP servers for local files: Excel, XML and PDF, plus a server that hands bounded language work to a local model.

Status: early. Every package below is on npm; APIs may still change. The spec, the fixture corpus and the NestJS SDK are tested in CI.

Why

A naive MCP adapter turns every endpoint into a tool and forwards calls over the network. That floods the agent's context, loses the caller's identity and silently papers over what it cannot represent. Sezzlee instead:

  • shows the agent three meta-tools (search_tools, load_tool, invoke_tool) rather than the whole catalog, so the size of your API does not grow the agent's context;
  • decides what a caller can see from the backend's own authorization, and still enforces every call in the backend at invoke time;
  • treats every silent resolution — a name collision, an unknown argument, a truncated response — as an error with a code the agent can act on.

The longer argument is on the docs site: why sezzlee is not an OpenAPI adapter.

Quick start

Pick what you need. The servers need Node.js 22+.

I want to…InstallStart here
Expose a NestJS API to agentsnpm install @sezzlee/sdk-nestjssdks/nestjs
Expose any backend that has an OpenAPI filenpx -y @sezzlee/openapi-mcppackages/servers/openapi-mcp
Let an agent read Excel workbooksnpx -y @sezzlee/excel-mcppackages/servers/excel-mcp
Let an agent read XML documentsnpx -y @sezzlee/xml-mcppackages/servers/xml-mcp
Let an agent read PDF documentsnpx -y @sezzlee/pdf-mcppackages/servers/pdf-mcp
Hand bounded text work to a local modelnpx -y @sezzlee/llm-mcppackages/servers/llm-mcp
Build my own read-only MCP servernpm install @sezzlee/mcp-corepackages/cores/mcp-core

Each package README has its own quick start, configuration and limits. To build from source, see CONTRIBUTING.md.

Packages

HTTP catalog
PackageWhat it isStatus
@sezzlee/sdk-nestjsNestJS SDKstable
@sezzlee/openapi-mcpGateway: an OpenAPI document as a catalog over a remote backendstable
@sezzlee/openapiSwagger 2.0 / OpenAPI 3.0–3.2 ingestionstable
@sezzlee/coreTypeScript reference implementation of the specstable
specThe normative spec and JSON Schemas — the single source of truthnormative
conformance480 JSON fixtures across 11 kinds that every implementation must pass—
Source servers and their cores
PackageWhat it isStatus
@sezzlee/excel-mcpReads local Excel workbookspublished
@sezzlee/xml-mcpReads local XML documentspublished
@sezzlee/pdf-mcpReads local PDF documents, with pluggable OCRpublished
@sezzlee/llm-mcpDelegates bounded language work to a local model (Ollama)published
@sezzlee/ocr-ollamaOCR provider for pdf-mcppublished
@sezzlee/pdf-raster-pdfjsPage rasterizer for pdf-mcppublished
@sezzlee/mcp-coreSource-agnostic machinery for read-only MCP serverspublished
@sezzlee/file-coreSandboxed file layer over mcp-corepublished
@sezzlee/ooxml-coreReader for OOXML (zip/OPC) containerspublished

Every package is published from CI with npm provenance; the tarballs are checked and smoke-installed before publication.

Also in this repository
  • apps/docs — the documentation site (TanStack Start). Run it with pnpm --filter @sezzlee/docs dev and open http://localhost:5180.

How the HTTP catalog works

  1. At startup the SDK reads your framework's route and authorization metadata and builds a catalog of tools, named by fixed rules; a name collision fails startup.
  2. An agent calls search_tools, gets compact cards for the tools this caller may use, and load_tool for the full schema of the one it picks, with a version fingerprint of it.
  3. invoke_tool composes an HTTP request from the arguments and replays it through your pipeline as the caller. The response is mapped to a fixed error vocabulary and a size budget before it reaches the agent. A call that passes version back is refused with tool_changed if the server answering it holds a different definition, as can happen mid-deploy. A behaviour change behind an unchanged schema is caught the same way once you declare it as a revision, on the operation, its controller or the whole catalog.

The rules for each step are in the spec, and the conformance corpus pins them so the reference implementation and the NestJS SDK cannot drift apart.

Documentation

License

MIT — see LICENSE.

Frequently asked questions

What is Sezzlee SQL Server?

Explore and query Microsoft SQL Server read-only: catalogue search, schema and bounded queries.

How do I install Sezzlee SQL Server?

It runs on your machine. In Claude Code: claude mcp add sezzlee-sql-server -e 'SEZZLEE_MSSQL_SERVER=<SEZZLEE_MSSQL_SERVER>' -e 'SEZZLEE_MSSQL_PORT=1433' -e 'SEZZLEE_MSSQL_DATABASE=<SEZZLEE_MSSQL_DATABASE>' -e 'SEZZLEE_MSSQL_USER=<SEZZLEE_MSSQL_USER>' -e 'SEZZLEE_MSSQL_PASSWORD=<your sezzlee_mssql_password>' -e 'SEZZLEE_MSSQL_ENCRYPT=true' -e 'SEZZLEE_MSSQL_TRUST_SERVER_CERTIFICATE=false' -e 'SEZZLEE_MSSQL_CONNECT_TIMEOUT_MS=15000' -e 'SEZZLEE_MSSQL_QUERY_TIMEOUT_MS=30000' -- npx -y @sezzlee/mssql-mcp@0.2.1. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Sezzlee SQL Server need an API key?

Yes. It expects SEZZLEE_MSSQL_SERVER, SEZZLEE_MSSQL_DATABASE, SEZZLEE_MSSQL_USER, SEZZLEE_MSSQL_PASSWORD, which you set in its configuration.

Is Sezzlee SQL Server open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Sezzlee SQL Server?

It is published by sezzlee. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.