Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Morningstar202604/awesome-skillkit --skill mcp-server-buildergit clone --depth 1 https://github.com/Morningstar202604/awesome-skillkitWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/morningstar202604/awesome-skillkit/mcp-server-builder)<a href="https://agentmods.dev/skills/morningstar202604/awesome-skillkit/mcp-server-builder"><img src="https://agentmods.dev/badge/skills/morningstar202604/awesome-skillkit/mcp-server-builder/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/morningstar202604/awesome-skillkit/mcp-server-builder"><img src="https://agentmods.dev/badge/skills/morningstar202604/awesome-skillkit/mcp-server-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00071 | $0.00864 |
| Opus 5 | $0.00036 | $0.00432 |
| Sonnet 5 | $0.00014 | $0.00173 |
| Haiku 4.5 | $0.00007 | $0.00086 |
Grade A, and why
mcp-server-builder scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Server Builder
Tier: POWERFUL · Category: Engineering · Domain: AI / API Integration
Overview
Use this skill to design and ship production-ready MCP servers from API contracts instead of hand-written one-off tool wrappers. It focuses on fast scaffolding, schema quality, validation, and safe evolution.
The workflow supports both Python and TypeScript MCP implementations and treats OpenAPI as the source of truth.
Core Capabilities
- Convert OpenAPI paths/operations into MCP tool definitions
- Generate starter server scaffolds (Python or TypeScript)
- Enforce naming, descriptions, and schema consistency
- Validate MCP tool manifests for common production failures
- Apply versioning and backward-compatibility checks
- Separate transport/runtime decisions from tool contract design
When to Use
- You need to expose an internal/external REST API to an LLM agent
- You are replacing brittle browser automation with typed tools
- You want one MCP server shared across teams and assistants
- You need repeatable quality checks before publishing MCP tools
- You want to bootstrap an MCP server from existing OpenAPI specs
Key Workflows
1. OpenAPI to MCP Scaffold
- Start from a valid OpenAPI spec.
- Generate tool manifest + starter server code.
- Review naming and auth strategy.
- Add endpoint-specific runtime logic.
python3 scripts/openapi_to_mcp.py \
--input openapi.json \
--server-name billing-mcp \
--language python \
--output-dir ./out \
--format text
Supports stdin as well:
cat openapi.json | python3 scripts/openapi_to_mcp.py --server-name billing-mcp --language typescript
2. Validate MCP Tool Definitions
Run validator before integration tests:
python3 scripts/mcp_validator.py --input out/tool_manifest.json --strict --format text
Checks include duplicate names, invalid schema shape, missing descriptions, empty required fields, and naming hygiene.
3. Runtime Selection
- Choose Python for fast iteration and data-heavy backends.
- Choose TypeScript for unified JS stacks and tighter frontend/backend contract reuse.
- Keep tool contracts stable even if transport/runtime changes.
What ships with it
8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- README.md 1.2 KB
- references/openapi-extraction-guide.md 867 B
- references/production-hardening-guide.md 2.9 KB
- references/python-server-template.md 610 B
- references/typescript-server-template.md 346 B
- references/validation-checklist.md 1.3 KB
- scripts/mcp_validator.py 5.5 KB runs code
- scripts/openapi_to_mcp.py 9.3 KB runs code
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 106 lines · 71 tokens per session scan A dbea23246b29
mcp-server-builder is a skill published in the GitHub repository Morningstar202604/awesome-skillkit (1 stars, last pushed yesterday), licensed Apache-2.0. It adds 71 tokens to every session and 864 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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