leanmcp-sdk
LeanMCP is a modular TypeScript toolkit for building and deploying MCP (Model Context Protocol) servers, providing an HTTP server runtime plus decorators-based tool/prompt/resource definitions. The README indicates optional modules for authentication, multi-tenancy, request logging, observability, and env/secret injection, along with a CLI for scaffolding and managing MCP projects.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
The README mentions authentication and request-scoped environment/secret injection modules, but it does not specify TLS enforcement, token types, scope granularity, secure storage patterns, or logging redaction. Dependency hygiene cannot be assessed from the provided content (package manifest in the prompt is incomplete/empty dependencies).
⚡ Reliability
Best When
You are already operating an MCP server (or plan to) and want a TypeScript SDK with decorators plus optional enterprise capabilities like auth and multi-tenancy.
Avoid When
You need explicit, verified details about authentication methods, scopes, rate limits, and error codes from the README alone, or you require an OpenAPI/SDK-first REST contract without running your own HTTP server.
Use Cases
- • Building MCP servers that expose tools, prompts, and resource endpoints from TypeScript
- • Creating enterprise/multi-tenant agent backends with authentication and isolation
- • Adding request logging and observability around MCP tool execution
- • Scaffolding new MCP services quickly using a CLI
Not For
- • Standalone public REST/GraphQL services unrelated to MCP
- • Projects that require a prebuilt hosted managed API as opposed to running your own server
- • Use cases needing a fully specified and documented OpenAPI/Swagger contract from the provided README alone
Interface
Authentication
README shows a @requireAuth() pattern but does not document the actual authentication method(s) (e.g., API key, JWT, OAuth), nor how scopes/permissions are represented.
Pricing
No pricing information is provided for the SDK itself or any hosted service in the supplied README content.
Agent Metadata
Known Gotchas
- ⚠ README indicates multiple optional modules (auth, env injection, observability) but the provided content does not specify behaviors, error formats, or retry semantics; agents may need to inspect the actual package docs/source for reliable handling.
- ⚠ Tool inputs/outputs rely on decorators and schema constraints; agents should validate payload shapes against the defined input classes to avoid schema-validation failures.
Alternatives
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Scores are editorial opinions as of 2026-03-30.