# LLM-Safe Adoption

APOPHIS is designed to be safe and predictable for LLM-generated Fastify services.

It applies the invariant-driven approach from [Invariant-Driven Automated Testing](https://arxiv.org/abs/2602.23922) (Malhado Ribeiro, 2021) to LLM-assisted development: constrained vocabulary, deterministic replay, and executable contracts give coding agents a verifiable loop between generated changes and behavioral correctness.

## Why APOPHIS Is Good for LLM-Generated Services

Coding agents benefit from:

- **Constrained vocabulary**: Small set of CLI commands and config options
- **Official scaffolds**: Tested templates that produce valid config
- **Policy guards**: CI catches unsafe modes and malformed setup
- **Deterministic output**: Fixed seed, config, schemas, and deterministic handlers produce repeatable output
- **Behavioral contracts**: Agents write `x-ensures` clauses, APOPHIS verifies them

## Official Scaffolds

Use `apophis init` with a preset:

| Preset | Use Case |
|---|---|
| `safe-ci` | Minimal CI-safe preset (default) |
| `llm-safe` | Minimal preset for LLM-generated codebases |
| `platform-observe` | Production-ready with observe mode |
| `protocol-lab` | Multi-step flow and stateful testing |

```bash
apophis init --preset llm-safe
```

## apophis doctor Checks

Run `apophis doctor` to validate your setup:

- **Dependencies**: Checks for `fastify`, `@fastify/swagger`
- **Config validation**: Rejects unknown keys, unsafe modes
- **Route discovery**: Confirms routes are discoverable
- **Safety checks**: Blocks qualify in production, missing sinks
- **Docs drift**: Validates examples in CI mode

```bash
apophis doctor
```

## CI Policy Guards

Add these checks to your CI pipeline:

```yaml
name: APOPHIS Checks

on: [push, pull_request]

jobs:
  apophis:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'
      - run: npm ci
      - run: npx apophis doctor
      - run: npx apophis verify --profile ci --changed
```

## Template Examples

### Minimal LLM-Safe Config

```javascript
// apophis.config.js
export default {
  mode: 'verify',
  profile: 'llm-check',
  profiles: {
    'llm-check': {
      name: 'llm-check',
      mode: 'verify',
      preset: 'llm-safe',
      routes: []
    }
  },
  presets: {
    'llm-safe': {
      name: 'llm-safe',
      timeout: 3000,
      parallel: false,
      chaos: false,
      observe: false
    }
  },
  environments: {
    local: {
      name: 'local',
      allowVerify: true,
      allowObserve: false,
      allowQualify: false,
      allowChaos: false,
      allowBlocking: false,
      requireSink: false
    }
  }
};
```

### Route Template with Behavioral Contract

```javascript
import crypto from 'crypto';

app.post('/users', {
  schema: {
    'x-category': 'constructor',
    'x-ensures': [
      // BEHAVIORAL: Creating a user must make it retrievable
      'response_code(GET /users/{response_body(this).id}) == 200'
    ],
    body: {
      type: 'object',
      properties: {
        name: { type: 'string', minLength: 1 }
      },
      required: ['name']
    },
    response: {
      201: {
        type: 'object',
        properties: {
          id: { type: 'string' },
          name: { type: 'string' }
        }
      }
    }
  }
}, async (request, reply) => {
  const { name } = request.body;
  const id = `usr-${crypto.createHash('sha256').update(name).digest('hex').slice(0, 8)}`;
  reply.status(201);
  return { id, name };
});
```

### CI Policy Guard Script

```javascript
// scripts/apophis-ci-guard.js
import { execSync } from 'node:child_process';

// Run doctor
const doctorResult = execSync('npx apophis doctor', { encoding: 'utf-8' });
console.log(doctorResult);

// Run verify
const verifyResult = execSync('npx apophis verify --profile ci --changed', { encoding: 'utf-8' });
console.log(verifyResult);
```

## Best Practices

1. **Start with presets**: Avoid raw manual config until the project needs explicit overrides.
2. **Run doctor first**: Catch setup issues before running verify.
3. **Use `--changed` in CI**: Only verify routes that changed in the PR.
4. **Commit config**: Store `apophis.config.js` in version control.
5. **Pin versions**: Pin `apophis-fastify` version in `package.json`.

## Troubleshooting

### "Unknown config key"

APOPHIS rejects unknown keys to prevent hallucinated config. Check the key name against the config schema.

### "Qualify blocked in production"

Qualify mode is blocked in production by default. Use a non-production environment or explicitly allow it in your environment policy.

### "Missing sink config"

Observe mode requires a sink config in staging/production. Add `requireSink: true` to your environment policy and configure a sink.