api-testing

api-testing is a skill for Claude Code from cyanheads/bls-labor-mcp-server. It costs 46 tokens per session (5,902 once invoked), scanned A, original, no licence file.

A collection of testing patterns for MCP tool and resource handlers using Vitest, a JavaScript and TypeScript test runner.

In plain words
What is it for?
Use it to test MCP handlers, mock their context, assert McpError results, test formatted responses, and set up Vitest.
Why use it?
It provides consistent ways to create test contexts, check errors, verify output formatting, configure tests, and keep tests isolated.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the bls-labor-mcp-server plugin — 32 skills, 1 MCP server shipped together

Install

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.

agentmods
npx agentmods add skills/cyanheads/bls-labor-mcp-server/api-testing
Any agent
npx skills add cyanheads/bls-labor-mcp-server --skill api-testing
Clone the repo
git clone --depth 1 https://github.com/cyanheads/bls-labor-mcp-server

Made for: Claude Code.

Or install bls-labor-mcp-server, the plugin that ships this one along with the rest of its 32 skills, 1 MCP server.

Wrote 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.

agentmods badge for api-testing

README.md
[![agentmods](https://agentmods.dev/badge/skills/cyanheads/bls-labor-mcp-server/api-testing.svg)](https://agentmods.dev/skills/cyanheads/bls-labor-mcp-server/api-testing)
Your own site
<a href="https://agentmods.dev/skills/cyanheads/bls-labor-mcp-server/api-testing"><img src="https://agentmods.dev/badge/skills/cyanheads/bls-labor-mcp-server/api-testing.svg" alt="Measured on agentmods" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,902 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00046 $0.05902
Opus 5 $0.00023 $0.02951
Sonnet 5 $0.00009 $0.01180
Haiku 4.5 $0.00005 $0.00590

Measured 5d ago against content hash 1958f0095306, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

api-testing 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 5d 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.

skills/api-testing/SKILL.md · 528 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Changes

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.

  1. 5d ago First seen · 528 lines · 46 tokens per session scan A 1958f0095306

Subscribe to this mod's changes

api-testing is a skill published in the GitHub repository cyanheads/bls-labor-mcp-server (1 stars, last pushed 6d ago), with no licence file. It adds 46 tokens to every session and 5,902 once invoked, about $0.0002 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.

Related

Other skills, from other repositories

api-testing

Testing patterns for MCP tool/resource handlers using createMockContext and Vitest. Covers mock context options, handler testing, McpError assertions, format testing, Vitest config setup, and test isolation conventions.

cyanheads/eia-energy-mcp-server · 46 tokens

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.

cyanheads/federal-reserve-mcp-server · 62 tokens

add-tool

Scaffold a new MCP tool definition. Use when the user asks to add a tool, create a new tool, or implement a new capability for the server.

cyanheads/federal-reserve-mcp-server · 35 tokens

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.enrich, ctx.content), and when to use each.

cyanheads/federal-reserve-mcp-server · 79 tokens

api-linter

MCP definition linter rules reference. Use when bun run lint:mcp or bun run devcheck reports a lint error or warning (format-parity, schema-is-object, name-format, server-json-, etc.) and you need to understand the rule, its severity, and how to fix it. Every rule ID the linter emits has an entry in this doc.

cyanheads/federal-reserve-mcp-server · 86 tokens

api-canvas

DataCanvas primitive reference — a Tier 3 SQL/analytical workspace for tabular MCP servers, backed by DuckDB. Use when registering tables from upstream APIs, running ad-hoc SQL across them, and exporting results. Covers the acquire → register → query → export flow, per-table TTL, the token-sharing pattern for…

cyanheads/federal-reserve-mcp-server · 85 tokens