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* fix(skills): move version into metadata and normalize to semver 29 skills declared `version` at the top level of their frontmatter. The schema reads it from `metadata`, so tooling that follows the schema either misses it or has to special-case the top level. Three motion skills also declared `version: 1.0`, which is not a valid semantic version; normalized to `1.0.0`. No behavioral change — frontmatter metadata only. * fix(skills): state activation triggers in skill descriptions 148 skills described what they cover but never named the situation that should trigger them. Since the description is what Claude matches against to decide whether to load a skill, a description without a trigger makes activation guesswork — the skill is either missed or loaded at the wrong time. Added a "Use when ..." clause to each, derived from the skill's own body (most already stated the trigger under "## When to Use" or in the opening line; that intent is now reflected in the frontmatter where it is actually read from). Descriptions were only appended to; no existing wording was removed. * fix(skills): sync activation triggers into the Codex skill mirror 10 of the skills whose descriptions changed are also mirrored under `.agents/skills/`, where the description was previously a verbatim copy. Left alone, the two surfaces would disagree about when the skill applies. Only the description line is synced; the Codex copies keep their reduced frontmatter, since that validator accepts only name, description, metadata, license, and allowed-tools. * fix(skills): correct three activation clauses from review - autonomous-loops: the clause pulled new loop work into a skill that its own body marks as a compatibility shim retained for one release. It now points at the canonical continuous-agent-loop instead. - continuous-learning: the description carried the v1 routing directive twice; collapsed to one. - homelab-pihole-dns: the clause fired on any broken home DNS. Narrowed to tasks that actually involve Pi-hole. * chore: retain current main lockfile --------- Co-authored-by: Çağrı Solakoğlu <cagri.solakoglu@vtcenerji.com> Co-authored-by: haelyra <49814733+haelyra@users.noreply.github.com>
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name, description, metadata
| name | description | metadata | ||
|---|---|---|---|---|
| mcp-server-patterns | Build MCP servers with Node/TypeScript SDK — tools, resources, prompts, Zod validation, stdio vs Streamable HTTP. Use Context7 or official MCP docs for latest API. Use when building or debugging an MCP server — tools, resources, prompts, validation, or transport choice. |
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MCP Server Patterns
The Model Context Protocol (MCP) lets AI assistants call tools, read resources, and use prompts from your server. Use this skill when building or maintaining MCP servers. The SDK API evolves; check Context7 (query-docs for "MCP") or the official MCP documentation for current method names and signatures.
For the broader routing decision of when a capability should be a rule, a skill, MCP, or a plain CLI/API workflow, see docs/capability-surface-selection.md.
When to Use
Use when: implementing a new MCP server, adding tools or resources, choosing stdio vs HTTP, upgrading the SDK, or debugging MCP registration and transport issues.
How It Works
Core concepts
- Tools: Actions the model can invoke (e.g. search, run a command). Register with
registerTool()ortool()depending on SDK version. - Resources: Read-only data the model can fetch (e.g. file contents, API responses). Register with
registerResource()orresource(). Handlers typically receive auriargument. - Prompts: Reusable, parameterised prompt templates the client can surface (e.g. in Claude Desktop). Register with
registerPrompt()or equivalent. - Transport: stdio for local clients (e.g. Claude Desktop); Streamable HTTP is preferred for remote (Cursor, cloud). Legacy HTTP/SSE is for backward compatibility.
The Node/TypeScript SDK may expose tool() / resource() or registerTool() / registerResource(); the official SDK has changed over time. Always verify against the current MCP docs or Context7.
Connecting with stdio
For local clients, create a stdio transport and pass it to your server’s connect method. The exact API varies by SDK version (e.g. constructor vs factory). See the official MCP documentation or query Context7 for "MCP stdio server" for the current pattern.
Keep server logic (tools + resources) independent of transport so you can plug in stdio or HTTP in the entrypoint.
Remote (Streamable HTTP)
For Cursor, cloud, or other remote clients, use Streamable HTTP (single MCP HTTP endpoint per current spec). Support legacy HTTP/SSE only when backward compatibility is required.
Examples
Install and server setup
npm install @modelcontextprotocol/sdk zod
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { z } from "zod";
const server = new McpServer({ name: "my-server", version: "1.0.0" });
Register tools and resources using the API your SDK version provides: some versions use server.tool(name, description, schema, handler) (positional args), others use server.tool({ name, description, inputSchema }, handler) or registerTool(). Same for resources — include a uri in the handler when the API provides it. Check the official MCP docs or Context7 for the current @modelcontextprotocol/sdk signatures to avoid copy-paste errors.
Use Zod (or the SDK’s preferred schema format) for input validation.
Best Practices
- Schema first: Define input schemas for every tool; document parameters and return shape.
- Errors: Return structured errors or messages the model can interpret; avoid raw stack traces.
- Idempotency: Prefer idempotent tools where possible so retries are safe.
- Rate and cost: For tools that call external APIs, consider rate limits and cost; document in the tool description.
- Versioning: Pin SDK version in package.json; check release notes when upgrading.
Official SDKs and Docs
- JavaScript/TypeScript:
@modelcontextprotocol/sdk(npm). Use Context7 with library name "MCP" for current registration and transport patterns. - Go: Official Go SDK on GitHub (
modelcontextprotocol/go-sdk). - C#: Official C# SDK for .NET.