legacy2mcp

io.github.bvenkata由 GitHub 账号 bvenkata 发布v0.5.1更新于 Nov 6, 2026

Turn a legacy SOAP/WSDL, database, or REST API into a safe, typed, audit-logged MCP server

概览

AI 生成的概览

把遗留的 SOAP/WSDL、数据库或 REST API 转成带类型校验和审计日志的 MCP 服务器,供助手调用。

可以做什么
  • 从 WSDL 地址、REST/OpenAPI 地址、爬取的网站或 GitHub/源码扫描生成配置
  • 检查配置并以 JSON 列出生成的工具,便于审阅或 CI 比对
  • 调用生成的 SOAP 操作、白名单表的查询/插入与命名查询,或白名单 REST 端点
  • 每次调用先按 JSON Schema 校验再发往后端,并写入本地审计日志
  • 打开本地测试聊天页,为每个发现的工具给出示例问题,并打印客户端连接片段
适用场景
当助手需要安全、带类型地访问遗留系统(SOAP 服务、老旧数据库或缺少文档的 REST API),又不想手写适配代码时使用。也适合在 CI 中固定 WSDL 契约,或先加一层 MCP 以便日后替换后端。
运行要求
本地安装 Python 包(pip、pipx 或 uvx)并准备描述适配器的 config.yaml。后端凭据以环境变量名引用(password_env、dsn_env、token_env),运行时读取。源码扫描的可选 LLM 辅助步骤需通过 --llm-api-key-env 提供兼容 OpenAI 的 API 密钥。需能访问 WSDL、REST 基址或被爬取的站点。仅支持 stdio 传输。
安装前请注意
写操作默认被排除,但开启 allow_write_operations 后会暴露插入和标记为写的端点;读写判定只是启发式,接入真实后端前应复核 write 标记。审计日志保存在本地、未加密,参数原样记录,不做个人信息脱敏。发现过程会跟随 HTTP 重定向,可能请求到其他主机。可选的 LLM 步骤会把有歧义的路由片段发给第三方,除非使用 --scan-only。

安装

在 SourceWeft 中

  1. 打开 控制台中的 legacy2mcp,将其添加到工作区。
  2. 为需要使用其工具的对话启用该服务。

Desktop only,通过 STDIO。 STDIO 服务会启动本地进程,因此需要 SourceWeft 桌面宿主。

其他 MCP 客户端

参照 仓库 中的启动说明。

README

legacy2mcp


Quick start

No API key, no cloning — pick whichever matches what you actually have, against live public demo targets:

bash
pip install legacy2mcp
# REST API -- tries OpenAPI/Swagger discoverylegacy2mcp init --rest-url "https://petstore3.swagger.io/api/v3"
# WSDL / SOAP service -- zeep introspects it live, no scan neededlegacy2mcp init --wsdl-url "http://www.dneonline.com/calculator.asmx?WSDL"
# A website with no API docs at all -- crawls it for forms/contentlegacy2mcp init --webpage-url "https://legacy2mcp.com/"

Run any one of those from a real terminal and that's the whole thing: it writes config.yaml, opens a local test-chat page with a clickable example question under every discovered tool — click one and see a real response come back from the live source, no AI key needed, just local keyword matching to sanity-check the server works — and prints a ready-to-paste connection snippet for Claude Desktop, Cursor, VS Code, and Claude Code. Wiring it into a real AI client is a copy-paste, not a separate step. (Prefer the raw tool list instead? legacy2mcp inspect --config config.yaml.)

legacy2mcp discover does the same for sources that benefit from a review step first (a Postman collection, a HAR capture, …): write a contract, open the same test chat, print the same connection snippet — one command either way.

Have your own WSDL, REST API, website, or codebase instead? legacy2mcp init (no flags) walks you through it — see Generate a config automatically. More demos (a local SOAP service, Docker, a WSDL served by raw URL) are listed in examples/.

[!NOTE] legacy2mcp introspects your legacy system live — every WSDL operation, every database table, every REST spec it can find — and builds a real JSON Schema for each tool from it. Every MCP tool call is schema-validated before it reaches your backend, write operations are excluded by default, and every call is audit-logged. No hand-written adapter code, no hand-maintained schemas, no arbitrary SQL from the LLM.

Contents

Install

bash
# Full install (recommended)pip install "legacy2mcp[ai]"
# Or the identical, scan-only-ready core -- AI-assisted `legacy2mcp init`# needs no extra package either way, just an API key at runtime; `[ai]`# above installs nothing extra today, it's just a stable, familiar namepip install legacy2mcp# or:  uv tool install legacy2mcp   ·   pipx install legacy2mcp

Also published to the MCP Registry as io.github.bvenkata/legacy2mcp, so registry-aware MCP clients can discover it directly.

How it works

mermaid
flowchart LR  WSDL["WSDL / XSD"] --> GEN["legacy2mcp<br/>schema generation"]  DB["DB schema<br/>(allowlisted tables)"] --> GEN  GEN --> TOOLS["Typed MCP tools<br/>one per operation / table / query"]  AGENT["AI agent /<br/>MCP client"] -->|tool call| VAL{"schema<br/>validation"}  TOOLS -. defines .-> VAL  VAL -->|invalid args| REJ["rejected, never<br/>reaches SOAP/DB"]  VAL -->|valid and allowed| BACKEND["SOAP endpoint<br/>or database"]  BACKEND --> RESP["plain JSON<br/>back to the agent"]  VAL --> LOG[("audit log")]

SOAP:

  1. Loads the WSDL with zeep, a mature, widely-used Python SOAP client.
  2. For every operation on every port/binding, converts the XSD input type into a JSON Schema (schema/xsd_to_jsonschema.py) — simple types, nested complex types, enums and arrays, recursively, depth-limited for pathological WSDLs.
  3. Registers one MCP tool per operation, named <adapter_id>_<OperationName>.
  4. On a tool call: validates arguments with jsonschema (schemas use additionalProperties: false), calls the operation via zeep, serializes the response to plain JSON, and writes an audit entry.

DB:

  1. Connects with the dialect's driver (psycopg / pyodbc / oracledb, imported lazily) and introspects the live column types for each allowlisted table (adapters/db_dialects.py) into JSON Schema (schema/sql_to_jsonschema.py).
  2. Registers select_<table> / insert_<table> per allowlisted table-and-operation, plus query_<name> per named query in config.
  3. On a tool call: validates arguments, builds SQL from the allowlisted table/columns (or runs the config-supplied named query) using one dialect-neutral :param placeholder convention, executes it, and writes an audit entry. The LLM never sees or writes SQL text.
  4. Operations whose names look like writes are excluded unless allow_write_operations: true.

REST:

  1. There's no live schema to introspect a plain REST API from the way there is a WSDL or a DB catalog, so the endpoint list (method, path, typed params) comes from config -- hand-written, or generated by legacy2mcp init's OpenAPI/Swagger discovery or source-code scan.
  2. Registers one MCP tool per allowlisted endpoint, named <adapter_id>_<name>.
  3. On a tool call: validates arguments, splits them into path/query/body by each param's declared location, substitutes {param} placeholders into the URL, and calls it with requests -- auth applied per the adapter's auth config (basic/bearer/none).
  4. Endpoints marked write: true are excluded unless allow_write_operations: true. legacy2mcp init sets that flag by default on non-GET endpoints and on endpoints whose names look like writes; in a hand-written config, the HTTP method alone does not hide an endpoint.

Why not just write an adapter by hand?

Because a hand-written adapter is a second copy of your system's schema that nobody remembers to update. The first time a WSDL operation's signature shifts or a column changes, your tool's JSON Schema silently drifts from reality — and an LLM calling it finds out by sending arguments that are wrong in a way nothing catches, or by getting a confusing runtime error from deep inside the SOAP/DB client. legacy2mcp builds the schema from the live system every time it starts, so a drifted call fails at validation, before it ever reaches your backend — not after.

Hand-written adapter (FastMCP / raw SDK)Generic OpenAPI-to-MCP proxylegacy2mcp
Schema sourceTyped by hand, per toolThe OpenAPI spec, if one existsThe live WSDL / DB schema, or a discovered OpenAPI spec
Can drift from the real systemYes — nothing re-checks itOnly if the spec itself is staleNo — rebuilt from the live source at startup
Covers SOAP / a databaseYou write that client code yourselfNo — REST/OpenAPI onlyYes, plus REST and plain websites
Write operations hidden by defaultNo — you remember to gate each oneNo — usually exposes everything the spec definesYes — explicit allow_write_operations opt-in
Audit log of every callDIYUsually noBuilt in
Time to a working serverHours to days, per systemMinutes, for a REST API with a specMinutes — legacy2mcp init

Point it at your own WSDL

yaml
# config.yamlserver:  name: my-legacy-mcp
adapters:  - id: legacy    type: soap    config:      wsdl_url: "https://service.example.com/LegacyService?wsdl"      auth:        type: basic        username: "svc-account"        password_env: "SERVICE_PASSWORD"   # value read from the environment, never the file      allow_write_operations: false        # Create*/Update*/Delete*/… stay hidden      include_operations: ["GetRecord", "GetRecordDetails", "SearchRecords"]
security:  audit:    enabled: true    path: "./legacy2mcp-audit.log"
bash
export SERVICE_PASSWORD=...legacy2mcp inspect --config config.yaml   # review the generated toolslegacy2mcp run     --config config.yaml   # start the MCP server (stdio)

A production-shaped template with comments lives at examples/soap/config.template.yaml.

Point it at your own database

bash
pip install "legacy2mcp[db-postgres]"   # or db-mssql / db-oracle
yaml
# config.yamladapters:  - id: orders    type: db    config:      dialect: postgres             # postgres | mssql | oracle      dsn_env: "ORDERS_DB_DSN"      # connection string, read from the environment      allow_write_operations: false # insert_<table> / write: true queries stay hidden      tables:        - name: orders          operations: [select]          columns: [id, status, total, created_at]   # column allowlist          filterable_columns: [status]                # equality filters on select_orders          max_rows: 200      queries:        - name: orders_by_status_since          sql: "SELECT id, status, total FROM orders WHERE status = :status AND created_at >= :since"          params:            - { name: status, type: string, required: true }            - { name: since, type: string, required: true }
bash
export ORDERS_DB_DSN=...legacy2mcp inspect --config config.yaml   # review the generated tools

Columns are introspected from the live schema at startup, the same way SOAP operation schemas come from the WSDL -- there's nothing to hand-maintain. There is no path from the LLM to arbitrary SQL, ever: it can only call select_<table> / insert_<table> for tables listed under tables:, or a query_<name> tool whose SQL you wrote under queries: -- the LLM supplies only the placeholder values a query's params declare, never SQL text. A production-shaped template lives at examples/db/config.template.yaml.

Point it at your own REST API

There's no WSDL or live database schema to introspect a plain REST/JSON API from, so the rest adapter's endpoint list is explicit config -- write it by hand, or generate a starting point with legacy2mcp init (next section).

yaml
# config.yamladapters:  - id: orders    type: rest    config:      base_url: "https://api.example.com"      auth:        type: bearer        token_env: "ORDERS_API_TOKEN"      allow_write_operations: false      endpoints:        - name: get_order          method: GET          path: "/orders/{order_id}"          params:            - { name: order_id, location: path, type: integer, required: true }        - name: create_order          method: POST          path: "/orders"          write: true   # stays hidden unless allow_write_operations: true          params:            - { name: total, location: body, type: number, required: true }

A production-shaped template lives at examples/rest/config.template.yaml.

[!NOTE] Both a non-GET method and an LLM-assisted classification are heuristics, not a guarantee the endpoint is actually safe to call unsupervised -- review write: flags and allow_write_operations before running against a real backend, same caveat as the SOAP adapter's write-verb heuristic below.

Generate a config automatically

legacy2mcp init asks what to point it at, then writes a starting config.yaml for you:

bash
legacy2mcp init
What do you want to point legacy2mcp at?  1) WSDL URL (SOAP service)  2) REST API URL (tries OpenAPI/Swagger discovery)  3) A website with no API docs at all (crawls it for forms/content)  4) GitHub repo URL or a local path to its source codeChoice [1-4]:
OptionWhat happensNeeds an LLM key?
WSDL URLPoints a soap adapter at it directly -- zeep introspects the live WSDL at inspect/run time anyway, so nothing needs scanning up front.No
REST API URLTries the common OpenAPI/Swagger spec locations (/openapi.json, /swagger.json, ...) against that URL and builds the rest adapter's endpoint list from the real spec if one's found; an empty scaffold otherwise.No
WebsiteCrawls same-site pages starting there (--max-pages/--max-depth bound it, default 25/2) the same way legacy2mcp discover --webpage-url does, then goes straight to a config instead of stopping at a contract.yaml. Every operation still lands at confidence: low / needs_review: true in the generated TODOs -- going through init skips a file, not the review.No
GitHub repo / local pathClones (or reads) the repo and statically scans its Python source (AST only, never executed) for a zeep.Client(...) call, a SQLAlchemy/Flask-SQLAlchemy model, or Flask/FastAPI routes -- picking soap/db/rest accordingly.Optional

Each also works non-interactively via a flag -- --wsdl-url, --rest-url, --webpage-url, --github-url, or --local-path -- for scripting or CI. Only the GitHub/source-code path can use an LLM, and only to refine what static analysis already found (ambiguous parameter types, read-vs-write classification) -- never a dump of your repo. It needs no extra dependency, just an OpenAI-compatible API key via --llm-api-key-env, or an interactive hidden prompt if you omit that (never written to disk); pass --scan-only to skip it outright and run static-analysis-only, same as not entering a key.

bash
legacy2mcp init --github-url https://github.com/you/your-api --scan-only --out config.yaml

Whichever path you take, review the generated file before running it -- it's marked up with # TODO comments for anything that couldn't be confidently inferred (an unresolved base_url, an unverified param type, which endpoints got classified write: true), and nothing in it is verified against the real backend until you do:

bash
legacy2mcp inspect --config config.yaml   # review the generated toolslegacy2mcp run     --config config.yaml   # start the MCP server

legacy2mcp init also writes a plain-English HTML report next to the config (e.g. config.yaml -> config.html) -- open it in a browser to see, in sentences rather than YAML, what tools the server will expose (every REST endpoint / DB table / SOAP target it found, which ones can change data and are gated behind allow_write_operations, and the review items above). Pass --html-out to change where it's written, or --no-html-report to skip it.

Run init from a real terminal against a config that's already usable (a live --wsdl-url/--rest-url, or a scan that found something concrete) and it also opens a local test-chat page in your browser, with a clickable example question under every discovered tool (generated from that tool's own name and schema, e.g. getPetById -> "get pet by id 4") so you don't have to guess what to type. Click one, or type your own, and it matches it to a discovered tool, calls the real adapter, and shows you the real response. No AI/API key needed for this -- it's local keyword matching against the tool names/descriptions, not an LLM, just enough to sanity-check that the server actually works before you wire up a real MCP client. It's skipped automatically when the config still has TODOs to fill in (nothing to connect to yet), and never opens at all in non-interactive/scripted runs. Pass --no-chat to opt out.

See docs/security.md for exactly what this heuristic does and doesn't guarantee before pointing it at anything real.

Discover a legacy interface before generating a server

init covers a live WSDL, a live REST URL, a website (--webpage-url), and a repo it can scan -- all of those go straight to a config, no separate step needed. For everything else -- a Postman collection someone already built, an OpenAPI spec file sitting in a repo with no server running yet, a database's stored-procedure catalog, a HAR capture of real traffic, or queues you already know about -- there's an explicit step first:

bash
legacy2mcp discover --postman-file my-collection.json --out contract.yamllegacy2mcp discover --openapi-file spec.yaml --out contract.yamllegacy2mcp discover --har-file traffic.har --out contract.yamllegacy2mcp discover --stored-procs --db-dialect postgres --db-dsn-env LEGACY_DB_DSN --out contract.yamllegacy2mcp discover --queue-config queues.yaml --out contract.yaml

A website can go through discover --webpage-url too (see below) if you want to review the contract before anything gets built -- init --webpage-url runs the identical crawl, it just doesn't pause there.

Each writes a Legacy Interface Contract (contract.yaml): every operation's inputs, outputs, enums, error codes, whether it reads or writes, and a confidence level -- high for a live schema/catalog, medium for a curated artifact like a Postman collection, low for anything inferred from sampled traffic -- plus needs_review flags and notes on anything uncertain. Review it like you'd review config.yaml's # TODOs.

Run that same command from a real terminal, though, and discover doesn't stop at the contract: if the contract has anything invocable in it (not every source does yet -- see below), it also writes a runnable config.yaml, opens the same no-API-key test-chat page init can auto-launch, and prints the same ready-to-paste MCP client JSON -- discover, try it, and get the connection snippet, in the one command you already ran. Pass --no-chat to skip that and just get the contract (the default in non-interactive/CI runs already), or --no-write-config to skip only the config.yaml write.

Prefer to review the contract first before anything gets built or run? Skip straight to either step yourself instead:

bash
legacy2mcp init --from-contract contract.yaml --out config.yamllegacy2mcp demo --from-contract contract.yaml

demo is the same "try it" step discover can auto-launch, just callable on its own (also works from an existing --config config.yaml, not only a contract) -- it saves a standalone chat.html pointing at the server it just started (opened automatically unless --no-open), and prints the client JSON once a config exists to point it at. The command has to keep running (Ctrl+C to stop) for that page to work; it's a thin client page with no backend of its own, so the real HTTP calls still have to be made by something, same reason the browser can't just open a config file and call a REST API directly.

A few things worth knowing:

  • No raw secret is ever written into a contract. A Postman collection's saved bearer token, a HAR capture's Authorization/Cookie header values -- none of it gets persisted; only a note that auth was present, for you to configure yourself. The one controlled exception is a small, non-sensitive-looking enum (e.g. a status field that only ever took a handful of values across enough samples to mean something) -- see docs/security.md.
  • For --har-file, legacy2mcp never drives a capture proxy itself -- point it at a HAR produced by anything: your browser devtools' "Export HAR", Postman's own traffic capture, or mitmproxy's built-in exporter (mitmdump --set hardump=out.har, or "Export as HAR" in the GUI). This is the lowest-confidence source (inferred from whatever was sampled, not a declared contract) -- every operation comes back flagged for review.
  • --webpage-url is for a legacy web app or content site with no API docs at all -- just a URL. It crawls same-site pages from there (--max-pages/--max-depth bound it, default 25 pages / depth 2, never leaving the starting host), turning every <form> into an operation (a <select>'s options, or a shared-name radio/checkbox group, become an enum) and every form-less page with real content into a read-only "get this page" tool. No JavaScript is executed and nothing is ever submitted; non-GET forms get a note to confirm the backend accepts a JSON body (the REST adapter always sends one, even though a real browser would POST application/x-www-form-urlencoded). Same lowest-confidence posture as --har-file -- but unlike every other discover source, base_url fills in automatically (it's the host just fetched), so the test-chat page opens right away. Full crawl mechanics: docs/security.md.
  • Stored procedures and queue descriptions are documented, not runnable yet. --stored-procs and --queue-config still produce real contract entries -- there's no adapter to actually call either today (see docs/roadmap.md), so init --from-contract skips them with a clear TODO rather than pretending they work. Same reason discover's auto-demo (above) has nothing to launch for a contract made up only of those -- it says so and just exits with the contract already written, rather than failing the whole command.
  • Every generated server also gets a describe_capabilities tool for free -- a connected agent can call it to ask "what can this system do?" (every tool's description, side effect, confidence, required fields, known error codes) before calling anything for real.
  • --out contract.html writes a human-readable report instead of the plain YAML -- the same operations, as a table, in your browser. It's still a valid --from-contract/demo --from-contract input: the full contract is embedded in the page (in a <script type="application/json"> tag), not just summarized for reading.

Teach your AI coding agent about legacy2mcp

The sections above are about the MCP servers legacy2mcp produces. This one is different: it's for when an AI coding agent (Claude Code, Cursor, Codex CLI, Gemini CLI, GitHub Copilot, ...) is helping you build the integration in the first place, and you want it to already know how.

bash
legacy2mcp install-skill

This writes short, command-first legacy2mcp instructions directly into the current repo's own agent context files — a Claude Code slash command (.claude/commands/legacy2mcp.md), a Cursor rule (.cursor/rules/legacy2mcp.mdc), and a ## legacy2mcp section appended (or updated in place) in AGENTS.md, GEMINI.md, and .github/copilot-instructions.md. The agent then already knows the core workflow — which init flag fits which source, review the # TODOs before trusting a generated config, check inspect before running anything live — without you re-explaining it every session. It's idempotent: re-running it replaces its own section rather than duplicating it, so it's safe to run again after an upgrade. Review what it writes and commit it so your whole team gets the same instructions (this repo does exactly that — see AGENTS.md).

There's also a standalone SKILL.md in this repo, written to the open Agent Skills standard — the same know-how in a form marketplaces like Agensi can list independently of any particular repo, for agents that discover skills that way instead.

Common commands

bash
# Print the installed legacy2mcp versionlegacy2mcp --version
# Generate a config from a live REST API (tries OpenAPI/Swagger discovery)legacy2mcp init --rest-url "https://api.example.com" --out config.yaml
# Generate a config from a WSDL URL directly -- no scan neededlegacy2mcp init --wsdl-url "https://service.example.com/Legacy?wsdl" --out config.yaml
# Generate a config from a website with no API docs at all -- crawls itlegacy2mcp init --webpage-url "https://your-legacy-app.example.com" --out config.yaml
# Generate a config by statically scanning a GitHub repo (no AI, no API key)legacy2mcp init --github-url https://github.com/you/your-api --scan-only --out config.yaml
# Same, with AI-assisted refinement of ambiguous parameter types / read-vs-writelegacy2mcp init --github-url https://github.com/you/your-api --llm-api-key-env OPENAI_API_KEY --out config.yaml
# Review a source before generating anything -- a Postman collection, OpenAPI# file, HAR capture, stored-procedure catalog, or queue descriptionlegacy2mcp discover --postman-file my-collection.json --out contract.yaml
# Try a config or contract in a chat page right now, no separate init steplegacy2mcp demo --from-contract contract.yamllegacy2mcp demo --config config.yaml
# Review the tools a config generates -- no server startedlegacy2mcp inspect --config config.yaml
# Print the tool list as JSON, for scripting or a CI diff checklegacy2mcp inspect --config config.yaml > tools.json
# Show only one exact tool namelegacy2mcp inspect --config config.yaml --tool legacy_get_order
# Start the MCP server (stdio)legacy2mcp run --config config.yaml
# Teach the AI coding agent working in *this* repo how to drive legacy2mcp# (see "Teach your AI coding agent about legacy2mcp" above)legacy2mcp install-skill

Client support

[Verified: Claude Desktop] [Verified: Cursor] [Verified: VS Code] [Claude Code] [Tested with MCP Inspector] [MCP compatibility]

"Verified" here means a specific, narrow thing: the exact command + config shape shown below was actually spawned and completed a real MCP initialize handshake over stdio -- not just "MCP should be compatible." For MCP Inspector, the loop was driven further: a real tools/list, a real tools/call, and the resulting audit log entry, all headlessly via the Inspector's own --cli mode. The last badge is what keeps that claim honest over time rather than a one-time snapshot: a CI job (mcp-compatibility.yml) re-runs that same tools/list / tools/call / audit-log loop on every push and fails the build if the server can't start or exposes the wrong tools. Every client below talks to legacy2mcp over stdio only -- there's no HTTP/SSE transport yet (it's on the roadmap, not shipped), so an http://localhost:... MCP URL won't work here.

ClientStatusHow it was verified
Claude DesktopVerifiedSpawned the exact claude_desktop_config.json command, completed a real initialize handshake, confirmed tools listed
CursorVerifiedSame, via .cursor/mcp.json's exact command
VS CodeVerifiedSame, via .vscode/mcp.json's exact command
Claude CodeDocumentedUses the identical launch command verified above via claude mcp add; that command itself wasn't independently re-run in this environment
MCP InspectorTestedFull CLI loop -- tools/list, tools/call, and the audit log entry it produced

This repo also ships the checked-in configs themselves -- .mcp.json, .cursor/mcp.json, and .vscode/mcp.json -- pointed at the bundled Petstore demo, so opening this repo in one of these tools gets you a working server with no setup. Copy whichever matches your tool into your own project and point --config at your own config.yaml.

Claude Desktop — claude_desktop_config.json

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%\Claude\claude_desktop_config.json

json
{  "mcpServers": {    "legacy2mcp": {      "command": "uvx",      "args": ["legacy2mcp", "run", "--config", "/absolute/path/to/config.yaml"]    }  }}

If you installed with pip/pipx instead of uv, use "command": "legacy2mcp" and drop the first element of args.

Cursor — .cursor/mcp.json

Project-local (.cursor/mcp.json) or global (~/.cursor/mcp.json):

json
{  "mcpServers": {    "legacy2mcp": {      "command": "uvx",      "args": ["legacy2mcp", "run", "--config", "/absolute/path/to/config.yaml"]    }  }}
VS Code — .vscode/mcp.json
json
{  "servers": {    "legacy2mcp": {      "type": "stdio",      "command": "uvx",      "args": ["legacy2mcp", "run", "--config", "/absolute/path/to/config.yaml"]    }  }}
Claude Code — CLI
bash
claude mcp add legacy2mcp -- uvx legacy2mcp run --config /absolute/path/to/config.yaml

Add --scope project to write a shared .mcp.json for your team (keep secrets out of it); check with claude mcp list.

MCP Inspector — a validation tool, not an AI client
bash
npx @modelcontextprotocol/inspector uvx legacy2mcp run --config /absolute/path/to/config.yaml

Opens a local web UI: connect to the server, confirm tools are listed, run one read-only tool, and check legacy2mcp-audit.log for the matching entry. That exact loop -- tool discovery, one real call, the audit log it produces -- is what the "Tested with MCP Inspector" badge above is actually backed by, driven headlessly through the Inspector's own --cli mode rather than just opened in a browser.

Passing secrets and troubleshooting: docs/clients.md.

What's handled

AreaCovered
Type mappingstring / int / long / decimal / boolean / date / dateTime / base64Binary / … → JSON Schema types + formats
Structurenested complex types, repeated elements → arrays, xsd:enumeration → enum, recursion depth-limited
Discoveryevery service → port → binding → operation; duplicate tool names rejected at startup
Invocationargument validation, zeep call, response serialized to plain JSON, single-field responses re-wrapped to a named result
ErrorsSOAP faults and transport errors caught and returned as clean messages — no stack traces to the caller
AuthHTTP basic (username + *_env password); bearer token (*_env); anonymous
Transportstdio (the transport Claude Desktop and most agent frameworks spawn)
DB dialectsPostgres, SQL Server, Oracle — table allowlist (select/insert) with live schema introspection, plus named parameterized queries
RESTexplicit endpoint allowlist (method + path + typed params) from config or legacy2mcp init — no live schema to introspect, so nothing here is verified until you run it
Discover sourcesPostman collections, local OpenAPI/Swagger files, a live DB's stored-procedure catalog, HAR traffic captures, declarative queue descriptions, and websites (--webpage-url, crawled for forms/content) → a reviewable contract.yaml (confidence, enums, error codes) → legacy2mcp init --from-contract or straight into init --webpage-url/demo
describe_capabilitiesevery generated server exposes this meta-tool for free — an agent can ask what the server can do before calling anything
Try it + connectinit/discover/demo all auto-open a no-API-key test-chat page and print a ready-to-paste connection snippet for Claude Desktop, Cursor, VS Code, and Claude Code

See docs/security.md for the full, honest security model — what's covered today and what isn't yet.

Safety model

LayerWhat it does
Schema validationNo arguments reach the SOAP/DB layer without passing jsonschema.validate against that tool's generated schema.
Read-only by defaultSOAP: operation names are matched against write-verb prefixes (Create, Update, Delete, Cancel, Void, Submit, Pay, …). DB: tables/queries are explicit opt-in, and insert/write-marked queries additionally require it. Neither is exposed unless you set allow_write_operations: true.
Explicit allow / denySOAP: include_operations / exclude_operations. DB: a table/column allowlist — there's no equivalent of "all tables" or arbitrary SQL.
Audit logOne JSON line per call — tool, arguments, timestamp, outcome, duration.
Secret hygieneCredentials and DB connection strings come from named environment variables; the YAML stays safe to commit.

[!WARNING] The SOAP write-operation filter is a name heuristic, not semantic analysis — an operation called ProcessRecord that deletes data would not be caught. For any system where a wrong call has real consequences, set include_operations explicitly and don't rely on the heuristic. The DB adapter's allowlist is explicit by construction, but there's no column-level data masking — an allowlisted column's values are always returned as-is. There is also no auth/authz on the MCP server itself yet — don't expose a server to untrusted callers. Details in docs/security.md.

Data flow and privacy

  • No telemetry. legacy2mcp collects no usage data and phones home to nothing. Every network call it makes is one you configured it to make — verified by checking every outbound HTTP call site in the source before writing this sentence.
  • Adapter calls go exactly where you pointed them, nowhere else. SOAP calls go to your wsdl_url, DB calls go to your dsn_env connection, REST calls go to your base_url.
  • legacy2mcp init's discovery calls are scoped to what you gave it. The WSDL path only contacts the URL you passed. The REST path probes the usual OpenAPI/Swagger locations under that URL. --webpage-url crawls same-site pages from the URL you passed, bounded by --max-pages and --max-depth. Both follow HTTP redirects, so a server that redirects can send a request to another host. The GitHub/source-code path clones the repo you specify and parses it locally with ast — nothing from it is ever executed.
  • The optional LLM-assist step sends only already-detected, ambiguous fragments — never your repo. It only runs on the GitHub/source-code path of legacy2mcp init, only if you provide an API key, and only sends the specific route names/paths/params the static scan already flagged as ambiguous, not a dump of your source. Skip it entirely with --scan-only.
  • legacy2mcp discover reads local files, except --stored-procs and --webpage-url. Postman, OpenAPI, HAR, and queue sources never touch the network — they read a file you passed. --stored-procs connects to the DSN in the env var you named, the same way the db adapter does, only to read the procedure/function catalog. --webpage-url fetches the URL you passed and same-site pages linked from it, following HTTP redirects. No raw secret or sampled value is ever written into the resulting contract.yaml — see docs/security.md.
  • Secrets never live in config.yaml. Passwords, DSNs, and API tokens are all referenced by environment-variable name (password_env, dsn_env, token_env) and read at runtime — the YAML stays safe to commit.
  • The audit log stays local and is not encrypted at rest. Every tool call is appended as one JSON line to security.audit.path. Arguments are logged as-is — there's no PII redaction; see docs/security.md for the full list of what the audit log does and doesn't do.

Use cases

DomainShape
Systems of recordAn agent reads status/detail records from a legacy back-office platform, read-only, every lookup logged.
Financial servicesExpose account and transaction reads without exposing transfers or adjustments.
Supply chain / ERPSurface order status, inventory, shipment tracking from an old SOAP middleware layer.
Internal support toolingA support copilot gets safe, typed access to the system of record instead of a scraped UI.
Migration & modernizationPut an MCP layer in front of a legacy service now; swap the backend later without touching the agent.

Real-world usage

In CI/CD — catch WSDL drift before it reaches production

legacy2mcp inspect loads the config, contacts the WSDL, builds every schema, and exits non-zero if anything fails:

yaml
- name: Check the WSDL still generates valid MCP tools  env:    SERVICE_PASSWORD: ${{ secrets.SERVICE_PASSWORD }}  run: |    pip install legacy2mcp    legacy2mcp inspect --config config/legacy.yaml > tools.json    git diff --exit-code --no-index tools/legacy.snapshot.json tools.json  # optional: pin the contract

Exit codes:

CodeMeaning
0Success
1A config, source, or runtime error — bad WSDL/DB/REST config, a repo that couldn't be cloned, a missing required environment variable, and so on
2Invalid command-line arguments (argparse's own default)

As a sidecar / long-running MCP server

legacy2mcp run speaks MCP over stdio. Package it with your config using the provided Dockerfile and let your MCP client launch it.

In a data pipeline

Call the same generated, validated tools from your own code via any MCP client library to pull records on a schedule — the audit log records exactly what was fetched.

Configuration reference

KeyDefaultMeaning
server.namelegacy2mcpMCP server name reported to clients
server.transportstdioonly stdio is implemented so far
adapters[].id—prefix for this adapter's tool names
adapters[].type—soap, db, or rest (implemented); queue is on the roadmap

SOAP adapter config:

KeyDefaultMeaning
adapters[].config.wsdl_url—WSDL location (http(s)://…?wsdl or a file path)
adapters[].config.auth{type: none}none or {type: basic, username, password_env}
adapters[].config.allow_write_operationsfalseexpose write-like operations
adapters[].config.include_operationsallallowlist of operation names
adapters[].config.exclude_operations[]denylist of operation names
adapters[].config.timeout_seconds15per-call SOAP timeout

DB adapter config:

KeyDefaultMeaning
adapters[].config.dialect—postgres, mssql, or oracle
adapters[].config.dsn_env—env var holding the connection string/DSN
adapters[].config.allow_write_operationsfalseexpose insert_<table> and write: true queries
adapters[].config.timeout_seconds15connection timeout
adapters[].config.tables[].name / .schema—table (and optional schema/owner) to allowlist
adapters[].config.tables[].operations[select]select and/or insert
adapters[].config.tables[].columnsall introspectedcolumn allowlist
adapters[].config.tables[].filterable_columns[]columns usable as equality filters on select_<table>
adapters[].config.tables[].max_rows200row cap, enforced after the query runs
adapters[].config.queries[].name / .sql / .params—a named query; sql uses :param_name placeholders
adapters[].config.queries[].writefalsegates this query behind allow_write_operations

REST adapter config:

KeyDefaultMeaning
adapters[].config.base_url—base URL the configured endpoints are relative to
adapters[].config.auth{type: none}none, {type: basic, username, password_env}, or {type: bearer, token_env}
adapters[].config.allow_write_operationsfalseexpose endpoints marked write: true
adapters[].config.timeout_seconds15per-call HTTP timeout
adapters[].config.endpoints[].name / .method / .path / .description—one allowlisted endpoint; path uses {param} placeholders for path params
adapters[].config.endpoints[].params[].name / .location / .type / .required—location is path, query, or body
adapters[].config.endpoints[].params[].enumunseta closed set of allowed values, enforced by schema validation — not just descriptive
adapters[].config.endpoints[].writefalsegates this endpoint behind allow_write_operations
adapters[].config.endpoints[].confidence / .error_codes / .needs_reviewunset / [] / falseonly ever populated by legacy2mcp discover + init --from-contract — how much to trust the finding, known error responses, and whether a human should look at it

Security config:

KeyDefaultMeaning
security.audit.enabledtruewrite the audit log
security.audit.path./legacy2mcp-audit.logaudit log location

Documentation

DocWhat it covers
docs/security.mdThe full, honest security model — what's validated and audited today, and what isn't yet
docs/roadmap.mdShipped vs. planned, version by version
docs/clients.mdConnecting every supported MCP client, secrets, troubleshooting
docs/releasing.mdThe PyPI / MCP Registry release process
docs/registry-submissions.mdRegistry / awesome-list submission status and reusable copy
examples/README.mdEvery runnable demo config (SOAP, REST, Docker)
llms.txtA machine-readable project summary for LLMs and agents
skill/legacy2mcp/A SKILL.md for coding agents (Claude Code, Cursor, Copilot, ...) — teaches an agent when and how to drive legacy2mcp itself
CHANGELOG.mdNotable changes, release by release
CONTRIBUTING.mdDev setup, how to add an adapter, PR expectations

Roadmap

VersionScopeStatus
v0.1SOAP/WSDL adapter, schema generation, validation, read-only default, audit log, run + inspect CLI, basic auth, stdio✅ shipped
v0.2Database adapter (Postgres / SQL Server / Oracle; table/operation allowlists + named parameterized queries, no arbitrary SQL ever)✅ shipped
v0.2.xREST adapter (explicit endpoint allowlist); legacy2mcp init -- scans a repo (SOAP client / ORM models / Flask/FastAPI routes) and generates a starter config, with optional OpenAI-compatible LLM assist for ambiguous bits✅ shipped
v0.3.xlegacy2mcp discover (Postman / OpenAPI file / HAR / stored-procs / queue / --webpage-url) → reviewable contract.yaml; --webpage-url crawls a whole site, not just one page; describe_capabilities meta-tool✅ shipped
v0.4.xlegacy2mcp demo -- try a contract/config in a chat page with no separate init step; discover --out contract.html✅ shipped
v0.5.xdiscover/init/demo all auto-open the test chat and print a ready-to-paste MCP client connection snippet; init --webpage-url goes straight to a config✅ shipped
plannedHTTP/SSE transport, role→tool authorization, OAuth2 for SOAPplanned
ideasQueue adapter (Kafka/RabbitMQ/SQS), workflow composition with approval gates, OpenTelemetry exportideas

Full detail in docs/roadmap.md. The BaseAdapter interface (discover_tools() + invoke()) is the extension point — the server core handles validation, dispatch and audit for any adapter.

Development

bash
pip install -e ".[dev]"pytest tests/ -v

Tests run against an in-process mock SOAP service and an in-process SQLite-backed stand-in for the DB adapter — no network, no real Postgres/SQL Server/Oracle required. The DB adapter's Postgres/SQL Server/Oracle dialects (db_dialects.py) have their SQL-translation logic covered by driver-free unit tests; connecting to a real instance of each is not part of the default suite.

CI runs the suite on Python 3.10–3.12 (ci.yml). Releases to PyPI and the MCP Registry are tag-triggered — see docs/releasing.md. The demo GIF is regenerated with vhs demo/demo.tape (demo/).

Contributing

Adapters for new legacy systems are the highest-value contribution — implement BaseAdapter and the core handles the rest. See CONTRIBUTING.md for dev setup, how adapters are structured, and PR expectations. This project follows the Code of Conduct. Issues and PRs welcome.

License

Apache 2.0

来源:README.md,提交 817384b

工具

0
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版本历史

8
  1. v0.5.1最新Oct 23, 2026
  2. v0.4.0Oct 22, 2026
  3. v0.2.6Oct 15, 2026
  4. v0.2.5Oct 14, 2026
  5. v0.2.3Oct 14, 2026
  6. v0.2.2Oct 13, 2026
  7. v0.2.1Oct 11, 2026
  8. v0.1.0Sep 16, 2026

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