Individual skill
mcp-server-spec
Design an MCP server for a product — the tool surface, auth model, and safety boundaries that make it genuinely usable by AI agents. Use when asked to spec an MCP server, expose a product to agents, design tools for Claude or other MCP clients, or review why an existing MCP server performs badly. Produces a complete server spec: a small task-shaped toolset with agent-tested descriptions, auth and scoping decisions, error design, and an explicit not-exposed list.
skills/mcp-server-spec/SKILL.md
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SKILL.mdcore · 5,618 bytes
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# MCP Server Spec Skill
Every SaaS is shipping an MCP server; most dump their REST API as forty tools and wonder why agents flail. This skill designs the server as what it actually is: a *user interface for a non-human user* — few tools, task-shaped, with descriptions written for a model deciding under uncertainty.
## What This Skill Produces
- A **toolset design**: 3-10 tools mapped to agent *tasks*, not API endpoints
- **Per-tool specs**: name, description (the routing surface), parameters, returns, error behaviour
- **Auth & scoping decisions**: how credentials flow, what a token can never do
- An explicit **not-exposed list** with reasons — the most load-bearing section
- A **test plan**: the agent-eval loop that proves the toolset works
## Required Inputs
