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

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 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:

. (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:

$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:

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 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 at skills/scripts/refresh-tool-index.ps1#L56-L78:

$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:

{
  "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:

# From repository root

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

Custom output paths support documentation pipelines:

.\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
skills/scripts/lib/ToolDiscovery.ps1	Implements Get-ReverseToolReport, Resolve-ReverseToolSpec, and version detection	Discovery module
tool-index.md (generated)	Human-readable reference for routing logic	Produced by script
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 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 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 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.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}