# How reverse-skill's refresh-tool-index Script Ensures Accurate Tool Paths: A Complete Technical Breakdown

> Learn how reverse-skill's refresh-tool-index script ensures accurate tool paths through dynamic discovery, filesystem validation, and structured output. Get a complete technical breakdown.

- Repository: [ZhaoXu/reverse-skill](https://github.com/zhaoxuya520/reverse-skill)
- Tags: deep-dive
- Published: 2026-08-14

---

**The `refresh-tool-index.ps1` script guarantees accurate tool paths by combining dynamic environment discovery, filesystem validation against actual skill definitions, and deterministic structured output generation.**

The `refresh-tool-index` script is the backbone of path accuracy in the [zhaoxuya520/reverse-skill](https://github.com/zhaoxuya520/reverse-skill) repository. It eliminates stale entries, verifies executable availability, and produces both human-readable and machine-readable indexes that downstream routing logic trusts.

## Why Path Accuracy Matters in reverse-skill

Reverse-engineering and penetration-testing workflows depend on precise tool locations. A misconfigured path breaks automation, corrupts skill routing, and wastes debugging time. The `refresh-tool-index` script solves this by treating the filesystem as the single source of truth rather than trusting static configuration files.

## Step 1: Dynamic Tool Discovery via ToolDiscovery.ps1

The script begins by importing its discovery engine at [skills/scripts/refresh-tool-index.ps1#L20](https://github.com/zhaoxuya520/reverse-skill/blob/main/skills/scripts/refresh-tool-index.ps1#L20):

```powershell
. (Join-Path $PSScriptRoot 'lib\ToolDiscovery.ps1')

```

This module provides three critical functions that probe the host environment:

- **`Get-ReverseToolReport`** – Scans registered tool specifications and queries each for availability
- **`Resolve-ReverseToolSpec`** – Converts abstract tool definitions into concrete filesystem paths using `Get-Command`, registry lookups, and well-known installation directories
- **Version detection** – Executes tools with `--version` or `-v` flags and parses output to capture exact build numbers

The discovery layer handles cross-platform variations (Windows registry vs. Unix `PATH`) and normalizes results into a consistent PowerShell object structure.

## Step 2: Validation Against Real Skill Files

Raw discovery produces candidate entries. The script filters these against the actual repository structure at [skills/scripts/refresh-tool-index.ps1#L66-L70](https://github.com/zhaoxuya520/reverse-skill/blob/main/skills/scripts/refresh-tool-index.ps1#L66-L70):

```powershell
$skillMd = Join-Path $PSScriptRoot "..\..\$($report.Skill)\SKILL.md"
if (-not (Test-Path -LiteralPath $skillMd)) {
    Write-Warning "Skipping $($report.Name): SKILL.md not found at $skillMd"
    continue
}

```

This **existence check** guarantees that:

- Every indexed tool maps to an active skill definition
- Deleted or renamed skills automatically disappear from the index
- Orphaned tool installations do not pollute the output

## Step 3: Structured Output Generation

Vetted reports flow into dual output pipelines. The script iterates at [skills/scripts/refresh-tool-index.ps1#L87-L96](https://github.com/zhaoxuya520/reverse-skill/blob/main/skills/scripts/refresh-tool-index.ps1#L87-L96):

```powershell
foreach ($report in $reports) {
    $mdLine = "| ``$($report.Name)`` | ``$($report.Skill)`` | $($report.Purpose) | $(if ($report.Available) { "yes" } else { "no" }) | ``$($report.ResolvedPath)`` | $($report.Version) | $($report.Source) | $($scriptRefs[$report.Name] -join ", ") |"
    Add-Content -Path $OutputMarkdown -Value $mdLine
}

```

### Markdown Table Output

The generated [`tool-index.md`](https://github.com/zhaoxuya520/reverse-skill/blob/main/tool-index.md) provides at-a-glance verification:

| Tool | Skill | Purpose | Available | Path | Version | Source | Script References |
|---|---|---|---|---|---|---|---|
| `jadx` | `apk-reverse` | APK decompilation | yes | `C:\Program Files\jadx\bin\jadx.exe` | 1.4.7 | GitHub | `apk-reverse/scripts/decode.ps1` |
| `frida` | `apk-reverse` | Dynamic instrumentation | yes | `C:\Python38\Scripts\frida.exe` | 16.2.0 | pip | `apk-reverse/scripts/frida-run.ps1` |

### JSON Machine Output

Simultaneously, the script builds [`tool-index.json`](https://github.com/zhaoxuya520/reverse-skill/blob/main/tool-index.json) at [skills/scripts/refresh-tool-index.ps1#L56-L78](https://github.com/zhaoxuya520/reverse-skill/blob/main/skills/scripts/refresh-tool-index.ps1#L56-L78):

```powershell
$jsonEntry = @{
    name           = $report.Name
    skill          = $report.Skill
    purpose        = $report.Purpose
    available      = $report.Available
    is_executable  = $report.IsExecutable
    resolved_path  = $report.ResolvedPath
    version        = $report.Version
    source         = $report.Source
    script_refs    = $scriptRefs[$report.Name]
}
$jsonOutput += $jsonEntry

```

This JSON enables programmatic capability checking:

```json
{
  "name": "jadx",
  "skill": "apk-reverse",
  "purpose": "APK decompilation",
  "available": true,
  "is_executable": true,
  "resolved_path": "C:\\Program Files\\jadx\\bin\\jadx.exe",
  "version": "1.4.7",
  "source": "GitHub",
  "script_refs": ["apk-reverse/scripts/decode.ps1"]
}

```

## Running the refresh-tool-index Script

Default execution generates indexes in standard locations:

```powershell

# From repository root

.\skills\scripts\refresh-tool-index.ps1

```

Custom output paths support documentation pipelines:

```powershell
.\skills\scripts\refresh-tool-index.ps1 `
    -OutputMarkdown ".\docs\tool-index.md" `
    -OutputJson    ".\docs\tool-index.json"

```

## Core Architecture Files

| File | Responsibility | Line Reference |
|------|---------------|----------------|
| `skills/scripts/refresh-tool-index.ps1` | Orchestrates discovery, validation, and output | [Main script](https://github.com/zhaoxuya520/reverse-skill/blob/main/skills/scripts/refresh-tool-index.ps1) |
| `skills/scripts/lib/ToolDiscovery.ps1` | Implements `Get-ReverseToolReport`, `Resolve-ReverseToolSpec`, and version detection | [Discovery module](https://github.com/zhaoxuya520/reverse-skill/blob/main/skills/scripts/lib/ToolDiscovery.ps1) |
| [`tool-index.md`](https://github.com/zhaoxuya520/reverse-skill/blob/main/tool-index.md) (generated) | Human-readable reference for routing logic | Produced by script |
| [`tool-index.json`](https://github.com/zhaoxuya520/reverse-skill/blob/main/tool-index.json) (generated) | Machine-readable capability data | Produced by script |

## Summary

- **Dynamic discovery** probes the actual runtime environment rather than trusting static configuration
- **Filesystem validation** cross-checks every tool against existing [`SKILL.md`](https://github.com/zhaoxuya520/reverse-skill/blob/main/SKILL.md) definitions, eliminating stale entries
- **Dual output format** serves both human reviewers and automated routing systems with identical underlying data
- **Deterministic regeneration** ensures the index reflects current system state every time the script runs

## Frequently Asked Questions

### How does refresh-tool-index handle tools that are installed but not referenced by any skill?

The script's `Test-Path` check against [`SKILL.md`](https://github.com/zhaoxuya520/reverse-skill/blob/main/SKILL.md) filters these out. Only tools with active skill definitions survive to the output stage.

### What happens if a tool's executable moves or is uninstalled between index runs?

`Resolve-ReverseToolSpec` detects the missing path during the next discovery phase. The `available` flag becomes `false` and the entry either disappears (if strict filtering is enabled) or appears as unavailable in the output.

### Can the script detect version downgrades or upgrades automatically?

Yes. The discovery module executes version flags on every run and captures the output string. Comparing successive [`tool-index.json`](https://github.com/zhaoxuya520/reverse-skill/blob/main/tool-index.json) files reveals version changes without manual tracking.

### Is refresh-tool-index cross-platform compatible?

The underlying `ToolDiscovery.ps1` implements platform-specific resolvers for Windows (registry, Program Files) and Unix-like systems (`which`, `command -v`). The main script remains portable PowerShell Core syntax.