# PRD: {{PROJECT_NAME}}

---
prd_id: {{PROJECT_NAME_KEBAB}}
title: {{PROJECT_NAME}}
version: 1.0
status: DRAFT
created: {{DATE}}
author: Quick Start Wizard
last_updated: {{DATE}}

# DEPENDENCIES (for inter-PRD coordination)
dependencies:
  requires: []
  recommends: []
  blocks: []
  shared_with: []

tags: [cli, tool]
priority: high
layers: [backend]
---

---

## 1. Overview

### 1.1 Problem Statement

{{PROJECT_DESC}}

### 1.2 Proposed Solution

Build a command-line tool with clear argument parsing, structured output, proper exit codes, and comprehensive help text. The tool follows Unix philosophy: do one thing well, support piping, and provide machine-readable output.

### 1.3 Success Metrics

| Metric | Current | Target | How to Measure |
|--------|---------|--------|----------------|
| Feature completeness | 0% | 100% | All commands implemented |
| Test coverage | 0% | 80%+ | Automated test suite |
| Command execution time | N/A | < 1s typical | Performance benchmarks |
| Exit code correctness | N/A | 100% | All error paths return correct codes |

---

## 2. User Stories

### Primary User: Developer / Power User

| ID | As a... | I want to... | So that... | Priority |
|----|---------|--------------|------------|----------|
| US-001 | user | run the tool with `--help` | I can see all available commands and options | MUST |
| US-002 | user | get structured output (JSON, table, plain) | I can parse results programmatically or read them | MUST |
| US-003 | user | get meaningful exit codes on errors | I can use the tool in scripts and CI/CD | MUST |
| US-004 | user | pass configuration via flags, env vars, or config file | I can customize behavior without editing code | MUST |
| US-005 | user | see colored output in terminals that support it | the output is easy to scan | SHOULD |
| US-006 | user | pipe input/output to other tools | I can compose workflows | SHOULD |
| US-007 | user | see a progress indicator for long operations | I know the tool is working | COULD |

---

## 3. Functional Requirements

### 3.1 Core Features

| ID | Requirement | Description | Acceptance Criteria |
|----|-------------|-------------|---------------------|
| FR-001 | Argument Parsing | Positional args, flags, subcommands | Given `tool --flag value`, When parsed, Then correct values assigned |
| FR-002 | Help System | Auto-generated help for all commands | Given `tool --help`, When executed, Then usage, options, examples shown |
| FR-003 | Output Formats | Support JSON, table, and plain text output | Given `--format=json`, When executed, Then valid JSON output |
| FR-004 | Exit Codes | Consistent exit codes for all error types | Given an error, When tool exits, Then correct exit code returned |
| FR-005 | Configuration | Config file + env var + flag precedence | Given config at all levels, When running, Then flag > env > file > default |
| FR-006 | Logging | Verbosity levels (quiet, normal, verbose, debug) | Given `-v`, When running, Then verbose output shown |

### 3.2 Command Structure

```
{{PROJECT_NAME_KEBAB}} [global-flags] <command> [command-flags] [arguments]

Commands:
  {{PROJECT_NAME_KEBAB}} init           Initialize configuration
  {{PROJECT_NAME_KEBAB}} run            Execute primary operation
  {{PROJECT_NAME_KEBAB}} status         Show current status
  {{PROJECT_NAME_KEBAB}} version        Show version information

Global Flags:
  -h, --help              Show help
  -v, --verbose           Verbose output
  -q, --quiet             Suppress non-error output
  --format=<format>       Output format: json, table, plain (default: table)
  --config=<path>         Config file path (default: ~/.config/{{PROJECT_NAME_KEBAB}}/config.yaml)
  --no-color              Disable colored output
```

### 3.3 Exit Codes

| Code | Meaning | When Used |
|------|---------|-----------|
| 0 | Success | Operation completed successfully |
| 1 | General error | Unspecified error |
| 2 | Usage error | Invalid arguments or flags |
| 3 | Configuration error | Missing or invalid config |
| 4 | Input error | Invalid input data |
| 5 | Network error | Connection or timeout failure |
| 10 | Permission denied | Insufficient permissions |
| 126 | Not executable | Command found but not executable |
| 127 | Not found | Command or resource not found |

---

## 4. Non-Functional Requirements

### 4.1 Performance

| Metric | Requirement |
|--------|-------------|
| Startup time | < 200ms |
| Typical command execution | < 1s |
| Memory usage | < 50MB for typical operations |
| Binary size | < 10MB (compiled languages) |

### 4.2 Security

| Aspect | Requirement |
|--------|-------------|
| Credentials | Never log or display secrets; read from env or secure config |
| Input Validation | Validate all user input before processing |
| File Operations | Validate paths, prevent directory traversal |
| Dependencies | Minimal dependency tree, audited for vulnerabilities |

### 4.3 Compatibility

| Platform | Support |
|----------|---------|
| Linux (x86_64, arm64) | Full |
| macOS (x86_64, arm64) | Full |
| Windows (x86_64) | Full |

---

## 5. Technical Specifications

### 5.1 Architecture

```
CLI Entry Point --> Argument Parser --> Command Router --> Command Handler --> Output Formatter
                                                               |
                                                         Config Loader
```

### 5.2 Configuration Precedence

```
1. Command-line flags (highest priority)
2. Environment variables ({{PROJECT_NAME_UPPER}}_*)
3. Config file (~/.config/{{PROJECT_NAME_KEBAB}}/config.yaml)
4. Built-in defaults (lowest priority)
```

### 5.3 Dependencies

<!-- CRITICAL: Verify every version exists before freezing. Run: npm view <pkg> versions --json | tail -5 -->

| Dependency | Version | Verified | Peer Conflicts | Purpose | Risk if Unavailable |
|------------|---------|----------|----------------|---------|---------------------|
| Argument parser library | Latest stable | [ ] | None | CLI arg parsing | Cannot run |
| Config library | Latest stable | [ ] | None | Config file support | Limited config |

### 5.4 Compatibility Notes

| Package A | Package B | Conflict | Resolution | Verified |
|-----------|-----------|----------|------------|----------|

### 5.5 Environment Variables

<!-- Source of truth for .env.example. /generate auto uses this to create secrets. -->

| Variable | Example / Format | Generation Method | Required | Notes |
|----------|-----------------|-------------------|----------|-------|
| [VAR_NAME] | [format] | [/generate ... or Manual] | [Yes/No] | |

---

## 6. Constraints & Assumptions

### 6.1 Constraints
- **Technical:** Must run without network access for local operations
- **UX:** Must follow GNU/POSIX conventions for flags and arguments

### 6.2 Out of Scope
- [ ] GUI or TUI interface
- [ ] Daemon/service mode
- [ ] Web server / API endpoint
- [ ] Plugin system
- [ ] Auto-update mechanism

---

## 7. Risks & Mitigations

| ID | Risk | Likelihood | Impact | Mitigation Strategy |
|----|------|------------|--------|---------------------|
| R-001 | Cross-platform path handling issues | M | M | Use path abstraction library, test on all platforms |
| R-002 | Breaking changes in CLI interface | M | H | Semantic versioning, deprecation warnings |
| R-003 | Large output overwhelming terminal | L | L | Pagination support, pipe-friendly output |

---

## 8. Implementation Plan

### 8.1 Phases

| Phase | Name | Scope | Prerequisites |
|-------|------|-------|---------------|
| 1 | Core CLI | Arg parsing, config, help system, output formatters | None |
| 2 | Commands | Implement all subcommands with business logic | Phase 1 |
| 3 | Polish | Error handling, cross-platform testing, packaging | Phase 2 |

### 8.2 Effort Estimate

| Phase | Effort | Complexity | Risk |
|-------|--------|------------|------|
| 1 | S | Low | Low |
| 2 | M | Med | Low |
| 3 | S | Low | Med |

---

## 9. Acceptance Criteria

### 9.1 Definition of Done

- [ ] All commands implemented and tested
- [ ] `--help` shows accurate usage for every command
- [ ] All exit codes documented and tested
- [ ] JSON output is valid and parseable
- [ ] Config file, env var, and flag precedence works correctly
- [ ] Unit test coverage >= 80%
- [ ] Cross-platform tested (Linux, macOS, Windows)
- [ ] No critical/high severity bugs open
