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 | $0.00110 | $0.01617 |
| Opus 5.5 | $0.00044 | $0.00647 |
| Sonnet 5.5 | $0.00022 | $0.00323 |
| Haiku 4.5 | $0.00011 | $0.00162 |
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 1mo 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 — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Server Builder
Design and deliver production-ready MCP servers from API contracts, replacing hand-written throwaway tool wrappers. Focused on fast scaffolding, schema quality, validation, and safe evolution. The workflow supports both Python and TypeScript MCP implementations, treating OpenAPI as the single source of truth.
Input Checklist
| Input | Required | Description |
|---|---|---|
| OpenAPI spec | Yes | --input openapi.json (or passed via stdin); must be a valid OpenAPI document |
| Server name | Yes | --server-name, e.g. billing-mcp; determines the generated directory and tool prefix |
| Language | No | --language python|typescript, default python |
| Output directory | No | --output-dir, default ./out |
| Runtime config | No | Optional runtime-config path for mcp_validator to validate |
When something is missing, ask for it all at once:
"Please provide: (1) OpenAPI spec path (or paste the content via stdin); (2) server name --server-name; (3) language python/typescript; (4) output directory (default ./out). I'll use defaults for everything else; once confirmed, I'll start."
Pre-flight Checks
- Python 3.8+ is available:
python3 --version→ prints a version number ≥3.8. Otherwise prompt to install, then STOP. - The two scripts are on disk:
test -f scripts/openapi_to_mcp.py && test -f scripts/mcp_validator.py→ both exist; if either is missing → STOP and report the filename. - The OpenAPI spec is readable:
test -r <input>or stdin has content. Otherwise report the error and ask the user to provide it.
Workflow
Step 1: Generate the MCP scaffold from OpenAPI
python3 scripts/openapi_to_mcp.py --input examples/mini-openapi.json --server-name billing-mcp --language python --output-dir out --format text # bundled sample spec; swap in your real spec with --input openapi.json
stdin is also supported (shown here as a comment to avoid clashing with the runnable example above):
cat openapi.json | python3 scripts/openapi_to_mcp.py --server-name billing-mcp --language typescript --output-dir out
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.
- 1mo ago Changed · -12 tokens per session 0d263af580aa
- 1mo ago Changed · -8 lines 0458460f4f35
- 1mo ago Changed · +25 lines · +51 tokens per session 1999817be5bb
- 1mo 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 (0 stars, last pushed 25d ago), licensed Apache-2.0. It adds 110 tokens to every session and 1,617 once invoked, about $0.0004 per session on Opus 5.5. 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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