Endpoint Validator

What it does

When your agent uses it

• Tasks that involve REST APIs

Example prompts

• “/endpoint-validator”

Requirements

• Pre-approved tools (allowed-tools): Bash, Read, Write, Glob, Edit

Workflow steps

3 steps, taken from the step headings in SKILL.md.

1. 1DISCOVER
2. 2VALIDATE
3. 3REPORT

What it can do on your machine

Read from SKILL.md and the folder at commit 5218674. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Bash
  • Read
  • Write
  • Glob
  • Edit

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • curl
  • jq

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use curl, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Endpoint Validator loads about 1.1k tokens when it runs, and up to ~6.3k if it reads all its reference files. Until then it costs about 21 tokens; SKILL.md has 354 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~21

When it runs · the whole SKILL.md, loaded when a task matches

~1.1k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~6.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NotePre-approves every shell command (allowed-tools: Bash)SKILL.md

  allowed-tools: Bash, Read, Write, Glob, Edit

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from notque/vexjoy-agent at commit 5218674, republished under its MIT licence (© notque). 354 words, ~1,072 tokens.

name

endpoint-validator

description

Deterministic API endpoint validation with pass/fail reporting.

allowed-tools

Bash, Read, Write, Glob, Edit

promoted_to

deploy

user-invocable

false

routing.triggers

validate endpoints, smoke test API, health check endpoints, test endpoint, check API, smoke test

routing.category

infrastructure

routing.not_for

process/service uptime or daemon liveness (use service-health-check); only HTTP/API endpoint request validation

routing.pairs_with

assessment, testing

{
  "base_url": "http://localhost:8000",
  "endpoints": [
    {"path": "/health", "expect_status": 200},
    {"path": "/api/v1/users", "expect_key": "data", "timeout": 10},
    {"path": "/api/v1/search?q=test", "max_time": 2.0}
  ]
}

ENDPOINT VALIDATION REPORT
==========================
Base URL: http://localhost:8000
  /api/health                    200 OK      45ms
  /api/products                  500 FAIL   "Internal Server Error"
  /api/slow                      200 SLOW   3.2s > 2.0s threshold

SUMMARY: Passed 13/15 (86.7%), Failed 1, Slow 1

# Pre-deployment gate with curl
jq -r '.endpoints[].path' endpoints.json | while read path; do
  curl -sf "http://localhost:8000$path" > /dev/null || { echo "FAIL: $path"; exit 1; }
done

© notque, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (references) in skills/infrastructure/endpoint-validator of notque/vexjoy-agent.

• SKILL.md
• references/auth-endpoint-patterns.md
• references/endpoint-config-preferred-patterns.md
• references/security-headers.md

Open the folder on GitHubat commit 5218674