> ## Documentation Index
> Fetch the complete documentation index at: https://evoke-f0bfabff.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Agent 00 — Environment

> Discovers installed tools, checks environment variables, and produces environment_report.json.

<Info>
  **File:** `agents/sdlc/00-environment.md` · **Model:** Sonnet · **Tools:** Bash, Read, Write
</Info>

## Purpose

Agent Zero is the SDLC entry point. It runs before any planning or implementation decision is made. It produces an honest snapshot of exactly what the current machine has — so every downstream agent can plan accordingly.

## What it does

1. Detects installed tools (Node, Python, Docker, databases, cloud CLIs, etc.)
2. Checks required environment variables
3. Installs free fallback alternatives for missing tools
4. Produces `environment_report.json`

## Why it matters

Every downstream agent's decisions flow from this report:

* Architecture choices depend on what runtimes are available
* Test runner selection depends on what testing tools exist
* Deployment strategy depends on whether Docker/Kubernetes are present

An honest `DONE_WITH_CONCERNS` beats a blocked pipeline every time.

## Outputs

```json theme={null}
// .rstack/runs/<run_id>/environment_report.json
{
  "node_version": "20.11.0",
  "npm_version": "10.2.4",
  "docker_available": true,
  "docker_version": "24.0.6",
  "git_version": "2.43.0",
  "python_version": "3.11.7",
  "missing_tools": [],
  "fallbacks_installed": [],
  "env_vars_present": ["DATABASE_URL", "PORT"],
  "env_vars_missing": ["AWS_ACCESS_KEY_ID"],
  "warnings": ["AWS credentials not found — deployment to AWS will fail"]
}
```

## Run order

Always run first:

```
00-environment → 01-transcript → 02-requirements → ...
```