mcp-server-builder skillA
mcp-server-builder is agent-read markdown (skill) from yeaight7/agent-powerups: Design high-quality MCP servers around workflows, narrow schemas, context-aware outputs, and actionable errors. Use when building or reviewing MCP tools for real agent tasks..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# MCP Server Builder Use this skill when designing or implementing an MCP server. ## When to Use - Building a new MCP server from scratch. - Refactoring a weak or over-thin MCP tool surface. - Reviewing whether a server exposes the right workflows. - Designing evaluation cases for MCP usability. ## Core Principles - Build **workflow tools**, not thin endpoint wrappers — one tool should complete a meaningful agent task, not expose a single API method. - Keep input schemas **narrow and typed** — reject unknown fields; use enums over free strings where possible. - Return **high-signal, size-bounded outputs** — default to concise; add `detail` or `verbose` flags when larger payloads are occasionally useful. - Make error messages **corrective** — tell the agent what to do next, not just what went wrong. - Prefer **human-meaningful identifiers** over opaque IDs when both are available. - Design **evaluation cases** before declaring the server "done". ## Workflow ### 1. Map the workflow - Identify the real tasks an agent must complete, not the underlying API surface. …
Read the whole file at its exact version.
How to install
mdr add yeaight7/agent-powerups/mcp-server-builder@git:20260606.37ed5ecmdr add yeaight7/agent-powerups/mcp-server-builder@sha256:b04c7f9432547240Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_664arafsrwghkpqz)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260606.37ed5ec latest | 2026-06-06 | 37ed5ec | 3,624 B | A | view · diff |
| git:20260515.fc6f9ad | 2026-05-15 | fc6f9ad | 3,614 B | A | view · diff |
| git:20260512.a615139 | 2026-05-12 | a615139 | 2,113 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3624 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
yeaight7/agent-powerups · 6 stars · license Apache-2.0 · pushed 2026-09-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_664arafsrwghkpqz GET https://markdownregistry.com/api/v1/resolve?ref=yeaight7/agent-powerups/mcp-server-builder GET https://markdownregistry.com/api/v1/blob/b04c7f94325472401807621c7ded8f9190e735faed1e4a5e20dddc52c416212e
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