What is rf-restinstance?

Guidance for writing Robot Framework tests with RESTinstance, a library for testing web APIs and checking their responses.

Use it to create API tests for requests, responses, CRUD flows, JSON Schema validation, and OpenAPI or Swagger specifications.

It reduces the need to write separate checks for JSON structure, response fields, data types, and API specifications.

rf-restinstance — Skill by manykarim

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/manykarim/robotframework-agentskills/robotframework-restinstance-skill

Any agent

npx skills add manykarim/robotframework-agentskills --skill robotframework-restinstance-skill

Clone the repo

git clone --depth 1 https://github.com/manykarim/robotframework-agentskills

Made for: Claude Code, Codex.

Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,300 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin 92% copy Near-identical to another mod 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.

Model	Per session	Once invoked
Fable 5	$0.00041	$0.02300
Opus 5	$0.00020	$0.01150
Sonnet 5	$0.00008	$0.00460
Haiku 4.5	$0.00004	$0.00230

Measured 2d ago against content hash 2113e31e01ff, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

rf-restinstance 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 2d 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.

Origin

This is a copy

92% identical to restinstance — 14 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.

skills/robotframework-restinstance-skill/SKILL.md · 380 lines

How it starts

The opening of the file, as written. The whole thing — 380 lines — stays where its author put it; the contents beside it link to each section on GitHub.

RESTinstance Library Skill

Quick Reference

RESTinstance is a REST API testing library with built-in JSON validation, schema support, and OpenAPI/Swagger spec integration. It provides a fluent interface for API testing with automatic response validation.

Installation

pip install RESTinstance

Library Import

*** Settings ***
Library    REST    ${API_URL}

Key Differentiators from RequestsLibrary

Feature	RESTinstance	RequestsLibrary
Built-in assertions	Yes	No (use RF assertions)
JSON Schema validation	Yes	No (need JSONLibrary)
OpenAPI/Swagger support	Yes	No
Response type validation	Yes (String, Integer, etc.)	Manual
State management	Automatic instance tracking	Session-based

Basic Usage

Simple GET Request

GET    /users/1
Integer    response status    200
String     response body name    John
Integer    response body id    1

POST with JSON Body

POST    /users    {"name": "John", "email": "[email protected]"}
Integer    response status    201
Integer    response body id
String     response body name    John

Complete CRUD Example

*** Test Cases ***
CRUD User Lifecycle
    # Create
    POST    /users    {"name": "John"}
    Integer    response status    201
    ${id}=    Integer    response body id

    # Read
    GET    /users/${id}
    Integer    response status    200
    String    response body name    John

    # Update
    PUT    /users/${id}    {"name": "John Updated"}
    Integer    response status    200
    String    response body name    John Updated

    # Delete
    DELETE    /users/${id}
    Integer    response status    204

Core Keywords Quick Reference

HTTP Methods

Keyword	Usage	Description
`GET`	`GET /endpoint`	GET request
`POST`	`POST /endpoint {"json": "body"}`	POST with JSON
`PUT`	`PUT /endpoint {"json": "body"}`	Replace resource
`PATCH`	`PATCH /endpoint {"json": "body"}`	Partial update
`DELETE`	`DELETE /endpoint`	Delete resource
`HEAD`	`HEAD /endpoint`	Headers only
`OPTIONS`	`OPTIONS /endpoint`	Get allowed methods

Read the full file on GitHub · 380 lines

Files

What ships with it

9 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.

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.

2d ago First seen · 380 lines · 41 tokens per session scan A 2113e31e01ff

Subscribe to this mod's changes

rf-restinstance is a skill published in the GitHub repository manykarim/robotframework-agentskills (30 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 41 tokens to every session and 2,300 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 92% identical to restinstance, differing in 14 lines, and is treated as a copy.

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