mcp-server-builder SKILL.md skillA
mcp-server-builder from yeaight7/agent-powerups is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add yeaight7/agent-powerups/mcp-server-builder@git:20260602.a5b7eebPins git:20260602.a5b7eeb in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- yeaight7/agent-powerups
- Path
skills/mcp-server-builder/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260602.a5b7eeb, committed Jun 2, 2026
- First version recorded
- May 12, 2026
- Size
- 3,624 bytes
- Repository stars
- 8
- License
- Apache-2.0
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.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file 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@sha256:b04c7f9432547240The line at the top of this page pins the label git:20260602.a5b7eeb, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_3vftmzxxrvgstja7)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between May 12, 2026 and Jun 2, 2026, about one every 10 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260602.a5b7eeb latest | 2026-06-02 | a5b7eeb | 3,624 B | A | view · diff |
| git:20260515.3c2fbea | 2026-05-15 | 3c2fbea | 3,614 B | A | view · diff |
| git:20260512.476dc4e | 2026-05-12 | 476dc4e | 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 · 8 stars · license Apache-2.0 · pushed 2026-09-27 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_3vftmzxxrvgstja7 GET https://markdownregistry.com/api/v1/resolve?ref=yeaight7/agent-powerups/mcp-server-builder GET https://markdownregistry.com/api/v1/blob/b04c7f94325472401807621c7ded8f9190e735faed1e4a5e20dddc52c416212e
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from yeaight7/agent-powerups
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