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© 2026 a21e. All rights reserved.

For Developers

Ship better code. Every time.

15 autonomous agents for PRs, tests, security, and CI. CodeShield for repo audits. Multi-model routing across 12 providers. And an OpenAI-compatible API you can adopt in one line.

Start free — $5Read the docs

One API call. Expert-level output.

a21e is to prompts what a compiler is to assembly. Drop-in compatible with the OpenAI API.

curl
curl https://api.a21e.com/v1/execute \
  -H "Authorization: Bearer a21e_your_key" \
  -d '{
    "input": "Review this PR for security issues",
    "model_tier": "standard"
  }'

Works with any HTTP client. SDKs for JS, Python, Go, Rust, C#, and PHP.

  1. Home
  3. For Developers

Built for the way you work

Every prompt is purpose-built for developer workflows. No generic output.

Code Reviews

Get consistent, thorough reviews that catch bugs, suggest improvements, and enforce your team's conventions.

Architecture Decisions

Evaluate trade-offs, document ADRs, and get recommendations grounded in your stack and constraints.

Documentation Generation

Generate accurate docs from code. READMEs, API references, inline comments — all matching your style.

Debugging Assistance

Describe the symptom, get structured root-cause analysis with suggested fixes ranked by likelihood.

API Design

Design REST, GraphQL, or RPC interfaces with consistent naming, versioning, and error handling patterns.

Test Generation

Produce meaningful test cases — unit, integration, E2E — that cover edge cases, not only happy paths.

Fits into your stack

Use a21e from wherever you write code. CLI, editor, API, or MCP — your choice.

CLI

Run a21e from your terminal. Pipe in code, get results.

VS Code Extension

Right-click enhance. Inline suggestions. Zero context switching.

MCP Plugin

Give your AI coding assistant access to a21e tools over MCP.

REST API

Full API with JSON-RPC and OpenAI-compatible shim.

6 SDKs

JavaScript, Python, Go, Rust, C#, PHP. First-class support for each.

Full API documentation

Quick start

Three lines of code. Expert-level output.

JavaScript
import { a21e } from '@a21e/sdk';
const result = await a21e.execute('Review this PR for security issues');
console.log(result.output);
Python
from a21e import A21e
result = a21e.execute("Review this PR for security issues")
print(result.output)

The difference is clear

Stop wrestling with generic AI. Get purpose-built developer tooling.

Without a21e

  • Write prompts from scratch
  • Switch between 5 AI tabs
  • No quality checks
  • Debug hallucinations manually

With a21e

  • Expert prompts selected automatically
  • One API, 12 providers
  • Quality gates on every output
  • Automatic retry on low scores

Get started in 5 minutes

1

Get your API key

Sign up and create an API key from Settings → API Keys

2

Install the SDK

Add the a21e SDK to your project with your package manager.

npm install @a21e/sdk
3

Execute your first task

Call execute with a natural-language intent. a21e picks the expert prompt, routes to the best model, and returns quality-gated output.

const result = await a21e.execute("Review this PR")

Also explore

a21e for other teams

For Teams

Shared memory, workspace policies, and usage controls for your engineering org.

Learn more

For Enterprise

SSO, audit trails, data residency, and centralized governance.

Learn more

Better code starts here.

Stop writing prompts from scratch. Get expert-level AI output tuned for developers. $5 to start.

Start free — $5