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Use when creating a new MCP (Model Context Protocol) server, extending an existing one, or debugging tool discoverability/performance. Guides through research → implementation → test → eval phases with TypeScript-first guidance matching our stack. Trigger on phrases like "build an MCP server", "expose X as an MCP tool", "write MCP tools for Y", "integrate Z via MCP".
Passed 20 of 22 test cases with the skill, and 10 of 22 without it.
and 15 more in the full report
10 fixed10 passed either way2 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 10 test cases the skill fixed. Same model, same prompt, with and without the skill.
We need a standalone CLI bundle for a remote model context server that has no local CLI binary, allowing us to dispatch single-shot tool calls without adding a standing entry to configuration files. Which CLI wrapper tool and command accomplish this?
| Checked | Without skill | With skill |
|---|---|---|
| Recommend the mcporter utility. | Missed | Passed |
| Use mcporter call or mcporter generate-cli for tool execution. | Missed | Passed |
The instructions your model reads when the skill loads.
Adapted from anthropics/skills/mcp-builder. MCP-server quality is measured by how well it lets LLMs accomplish real-world tasks — not by endpoint count.
stdio for local tools, Streamable HTTP (stateless JSON) for remote@modelcontextprotocol/sdkAPI coverage vs. workflow tools. Balance comprehensive endpoint coverage with specialized workflow shortcuts. Default to coverage unless you have a clear reason — agents compose basic tools well; workflow tools ossify.
Tool naming & discoverability. Consistent prefix + action verb. Examples:
github_create_issue, github_list_reposgitlab_search_issues, gitlab_close_mrContext management. Return focused, paginated data. Agents suffer when a single tool call floods context.
Actionable error messages. Errors must guide the next action:
❌ "Invalid input"
✅ "Field 'project_id' is required. Call gitlab_list_projects to enumerate available IDs."
https://modelcontextprotocol.io/sitemap.xml.md to any page URL for markdown (e.g. https://modelcontextprotocol.io/specification/draft.md)Focus on: tool definitions, resource definitions, transport mechanisms.
https://raw.githubusercontent.com/modelcontextprotocol/typescript-sdk/main/README.mdtest cases passed, vs 10 / 22 without
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