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Grok Bot+18 agentsProduction-Ready API Builder
Turn requirements into secure, validated, and documented production-ready API designs and implementations.
$19.99
Production-Ready API Builder
Example session with this skill installed
Design a REST API for a task management system. I need endpoints to create tasks, assign users, and track status. Use Node.js and PostgreSQL.
- Read your context and instructions
- Compiled the production-ready api builder
I have designed the task management API contract focused on resource ownership and data integrity.
Task Management API Design
API Resource Model
| Method | Path | Purpose | Auth | Success |
|---|---|---|---|---|
| GET | /api/v1/tasks | List tasks (filtered by user/status) | Required | 200 |
| POST | /api/v1/tasks | Create a new task | Required | 201 |
| GET | /api/v1/tasks/{id} | Retrieve task details | Required | 200 |
| PATCH | /api/v1/tasks/{id} | Update status or assign user | Required | 200 |
| DELETE | /api/v1/tasks/{id} | Archive/Delete task | Required | 204 |
Implementation Schema (Node.js/PostgreSQL)
// Request Validation Schema (Joi/Zod style)
const taskSchema = {
title: string().min(3).max(255).required(),
description: string().allow(''),
priority: string().valid('low', 'medium', 'high').default('medium'),
assignee_id: uuid().optional()
};
// Repository Layer Logic
async function updateTaskStatus(taskId, status, userId) {
const query = `
UPDATE tasks
SET status = $1, updated_at = NOW()
WHERE id = $2 AND (owner_id = $3 OR assignee_id = $3)
RETURNING *;
`;
const values = [status, taskId, userId];
return await db.query(query, values);
}
Security & Validation Strategy
Ownership Enforcement: The WHERE clause in all update/delete queries includes owner_id to prevent ID guessing attacks.
2. Input Sanitization: Use of parameterized queries to prevent SQL injection.
3.
Status Transitions: Logic ensures tasks cannot move from "Completed" back to "Draft" without specific permissions.
Next steps
- Generate the full OpenAPI 3.0 specification file.
- Initialize the database migration scripts for the tasks and assignments tables.
- Configure the JWT middleware for the
assignee_idvalidation.
Connects securely to your tools. The creator never sees your data.
About this skill
Building APIs for production often results in fragmented documentation, inconsistent error handling, and overlooked security boundaries. This skill acts as a Senior API Architect to bridge the gap between product requirements and hardened code. It forces a design-first approach, ensuring every endpoint has a clear contract, validated schemas, and an explicit authorization plan before a single line of implementation is written.
What it does
- API modeling defines RESTful resources, actions, and relationships using consistent HTTP methods and status codes.
- Contract generation produces OpenAPI specifications including request parameters, body schemas, and response envelopes.
- Security architecture designs authentication flows, role-based access, and per-resource authorization logic.
- Schema validation builds rigorous input checks for types, formats, and ranges to prevent mass assignment or injection.
- Error handling creates a uniform error structure with stable codes, request IDs, and safe messages.
- Testing strategy generates unit, integration, and contract tests for both success and failure states.
How it works
- Requirements Intake evaluates your business goals, consumer types (mobile, web, internal), and technical stack.
- Contract Design models the resources and builds the endpoint specification table.
- Implementation Scaffolding generates the service layer, repository patterns, and middleware in your preferred language.
- Readiness Review audits the design against production checklists for logging, rate limiting, and observability.
Frameworks & tools
This skill is language-agnostic and adapts to your stack, whether using Node.js (Express/Fastify), Python (FastAPI/Django), Go, or Java. It produces standard OpenAPI/Swagger documentation and works with any SQL or NoSQL database.
Why this beats prompting it yourself
Generic prompts often produce "hello world" endpoints that lack input validation, use inconsistent naming, and ignore authorization boundaries. This skill follows a multi-phase engineering workflow that treats security, pagination, and error handling as first-class requirements rather than afterthoughts.
Use cases
- Drafting a secure public-facing API for a third-party developer ecosystem.
- Refactoring a monolithic backend into documented, versioned microservices.
- Designing high-concurrency internal APIs with strict rate limits and logging.
- Converting loose product requirements into a technical specification for a sprint.
Known limitations
This skill provides architecture and code guidance only. It cannot execute code, perform live security scans, or deploy to production environments. Real secrets must be managed externally.
Guidance only. Cannot execute code, run live security scans, or manage deployments. Requires external secret management.
How to use
- 1
Connect your agent to the Agensi MCP
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- 2
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- 3
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