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 cyanheads/met-museum-mcp-server --skill api-configgit clone --depth 1 https://github.com/cyanheads/met-museum-mcp-serverWrote 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/cyanheads/met-museum-mcp-server/api-config)<a href="https://agentmods.dev/skills/cyanheads/met-museum-mcp-server/api-config"><img src="https://agentmods.dev/badge/skills/cyanheads/met-museum-mcp-server/api-config/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/cyanheads/met-museum-mcp-server/api-config"><img src="https://agentmods.dev/badge/skills/cyanheads/met-museum-mcp-server/api-config.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 | $0.00043 | $0.07251 |
| Opus 5.5 | $0.00017 | $0.02900 |
| Sonnet 5.5 | $0.00009 | $0.01450 |
| Haiku 4.5 | $0.00004 | $0.00725 |
Grade A, and why
api-config 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 12d 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.
This is a copy
100% identical to api-config — 54 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 310 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Overview
Configuration has two layers: core config (managed by the framework, env-driven) and server config (your own Zod schema for domain-specific env vars). Never merge them.
Import: AppConfig, config, parseConfig, resetConfig, ConfigSchema from @cyanheads/mcp-ts-core/config.
Core config
Managed by @cyanheads/mcp-ts-core. Validated via Zod from environment variables. Uses a lazy proxy — parsing is deferred until the first property read.
Priority (highest to lowest):
name/version/title/websiteUrl/description/iconsoptions passed tocreateApp()orcreateWorkerHandler()- Environment variables
sessionMode.defaultpassed tocreateApp()— a default, so it sits below the env var it seeds, unlike the identity options abovepackage.jsonfields
Where package.json is read from: the application root — the nearest package.json at or above the process entry module (process.argv[1]), which is the served package on every launch path (npx, .mcpb, a client config naming dist/index.js), none of which run from the package root. The launching client's working directory is never the anchor: a stdio client starts the server from wherever it happens to be, so reading identity from there makes a server report a foreign project's name and version. When the entry module is a tool installed under a node_modules tree and the process runs from the directory owning that tree — a test runner is the usual case — the nearest manifest at or above the working directory wins instead. That also covers a workspace monorepo, where the runner is hoisted to the repo root while the process runs from a package directory: an owner that is a strict ancestor of the working directory qualifies only when it declares a workspace (a workspaces field in its manifest, or a pnpm-workspace.yaml beside it), which is what keeps a cache prefix or a plain project root — equally ancestors of a working directory inside them — from overriding an installed package's own identity. The owner is the outermost node_modules boundary, so a transitively-installed runner and a pnpm isolated layout resolve the same way. With no manifest reachable, the framework's own identity is the fallback.
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.
- 12d ago Changed · +1 lines 6b06eafa1792
- 22d ago Changed · +9 lines 38196ef39f16
- 26d ago Changed · +5 lines d00bd7a1b5db
- 1mo ago Changed 437f472735b4
- 1mo ago Changed · +18 lines 7c0f6ef176d2
- 1mo ago Changed · -12 lines 4d72f2efde5c
- 1mo ago First seen · 289 lines · 43 tokens per session scan A 9b2ee869e324
api-config is a skill published in the GitHub repository cyanheads/met-museum-mcp-server (4 stars, last pushed 10d ago), licensed Apache-2.0. It adds 43 tokens to every session and 7,251 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to api-config, differing in 54 lines, and is treated as a copy.
Other skills, from other repositories
design-mcp-server
Design the tool surface, resources, and service layer for a new MCP server. Use when starting a new server, planning a major feature expansion, or when the user describes a domain/API they want to expose via MCP. Produces a design doc at docs/design.md that drives implementation.
api-context
Canonical reference for the unified Context object passed to every tool and resource handler in @cyanheads/mcp-ts-core. Covers the full interface, its RequestContext base, all sub-APIs (ctx.log, ctx.state, ctx.requestInput, ctx.inputs, ctx.clientCapabilities, ctx.enrich, ctx.content), and when to use each.
api-errors
McpError constructor, JsonRpcErrorCode reference, and error handling patterns for @cyanheads/mcp-ts-core. Use when looking up error codes, understanding where errors should be thrown vs. caught, or using ErrorHandler.tryCatch in services.
api-config
Reference for core and server configuration in @cyanheads/mcp-ts-core. Covers env var tables with defaults, priority order, server-specific Zod schema pattern, and Workers lazy-parsing requirement.
api-workers
Cloudflare Workers deployment using createWorkerHandler from @cyanheads/mcp-ts-core/worker. Covers the full handler signature, binding types, CloudflareBindings extensibility, runtime compatibility guards, and wrangler.toml requirements.
add-service
Scaffold a new service integration. Use when the user asks to add a service, integrate an external API, or create a reusable domain module with its own initialization and state.