MCP Server — cyanheads/mcp-ts-core

TypeScript framework for building MCP servers with declarative definitions and observability.

What you get

@cyanheads/mcp-ts-core is the infrastructure layer for TypeScript MCP servers. Install it as a dependency — don't fork it. Your agent collaborates with you to design and build the tools, resources, and prompts for your server.

• Declarative definitions — — tool(), resource(), prompt() builders with Zod schemas; appTool()/appResource() add interactive HTML UIs
• Server-level orientation — — instructions on createApp/createWorkerHandler rides every initialize for the model. Cross-tool composition hints, regional notes, scope guidance — without leaking text into every tool description
• Server identity — — optional title, websiteUrl, description, icons (SEP-973) on createApp/createWorkerHandler flow to initialize serverInfo, the /.well-known/mcp.json server card, and the landing page
• Unified Context — — one ctx for logging, tenant-scoped storage, elicitation, cancellation, and task progress
• Auth — — auth: ['scope'] on definitions, checked before dispatch (no wrapper code). Modes: none, jwt, or oauth (local secret or JWKS)
• Task tools — — task: true for long-running ops; framework manages create/poll/progress/complete/cancel

More MCP options

Compare MCP servers by category, or browse hosted MCP servers if you prefer an endpoint over a local process.

Maintainer setup documentation.