Trx Analysis Agent Skill

Parse and analyze Visual Studio TRX test result files. Use when asked about slow tests, test durations, test frequency, flaky tests, failure analysis, or test execution patterns from TRX files.

2k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

967

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/microsoft/vstest --skill trx-analysis

The instruction itself

15 sections, as written by the author

TRX Test Results Analysis

Parse .trx files (Visual Studio Test Results XML) to answer questions about test performance, frequency, failures, and patterns.

TRX File Format

TRX files use XML namespace http://microsoft.com/schemas/VisualStudio/TeamTest/2010. Key elements:

TestRun.Results.UnitTestResult — individual test executions with testName, duration (HH:mm:ss.fffffff), outcome (Passed/Failed/NotExecuted)
TestRun.TestDefinitions.UnitTest — test metadata including class and method info
TestRun.ResultSummary — aggregate pass/fail/skip counts

Loading a TRX File

[xml]$trx = Get-Content "path/to/file.trx"
$results = $trx.TestRun.Results.UnitTestResult

Common Queries

Top N slowest tests

$results | ForEach-Object {
    [PSCustomObject]@{
        Test     = $_.testName
        Seconds  = [TimeSpan]::Parse($_.duration).TotalSeconds
        Outcome  = $_.outcome
    }
} | Sort-Object Seconds -Descending | Select-Object -First 25 |
  Format-Table @{L='Sec';E={'{0,6:N1}' -f $_.Seconds}}, Outcome, Test -AutoSize

Slowest test from each distinct class (top N)

$results | ForEach-Object {
    $parts = $_.testName -split '\.'
    [PSCustomObject]@{
        Test      = $_.testName
        ClassName = ($parts[0..($parts.Length-2)] -join '.')
        Seconds   = [TimeSpan]::Parse($_.duration).TotalSeconds
    }
} | Sort-Object Seconds -Descending |
  Group-Object ClassName | ForEach-Object { $_.Group | Select-Object -First 1 } |
  Sort-Object Seconds -Descending | Select-Object -First 10 |
  Format-Table @{L='Sec';E={'{0,6:N1}' -f $_.Seconds}}, ClassName, Test -AutoSize

Most-executed tests (parameterization frequency)

Extract the base method name before parameterization and count runs:

$results | ForEach-Object {
    $name = $_.testName
    if ($name -match '^(\S+?)[\s(]') { $base = $Matches[1] } else { $base = $name }
    [PSCustomObject]@{ Base = $base; Seconds = [TimeSpan]::Parse($_.duration).TotalSeconds }
} | Group-Object Base | ForEach-Object {
    [PSCustomObject]@{
        Runs     = $_.Count
        TotalSec = ($_.Group | Measure-Object Seconds -Sum).Sum
        Test     = $_.Name
    }
} | Sort-Object TotalSec -Descending | Select-Object -First 20 |
  Format-Table @{L='Runs';E={$_.Runs}}, @{L='TotalSec';E={'{0,7:N1}' -f $_.TotalSec}}, Test -AutoSize

Failed tests

$results | Where-Object { $_.outcome -eq 'Failed' } | ForEach-Object {
    [PSCustomObject]@{
        Test    = $_.testName
        Seconds = [TimeSpan]::Parse($_.duration).TotalSeconds
        Error   = $_.Output.ErrorInfo.Message
    }
} | Format-Table -Wrap

Summary statistics

$summary = $trx.TestRun.ResultSummary.Counters
[PSCustomObject]@{
    Total    = $summary.total
    Passed   = $summary.passed
    Failed   = $summary.failed
    Skipped  = $summary.notExecuted
    Duration = $trx.TestRun.Times.finish
} | Format-List

Cross-File Duplicate Analysis

Compare two TRX files to find tests that appear in both and ran (were not skipped) in both. Useful for identifying redundant CI work across different configurations (e.g., net9.0 x64 vs net48 x86).

Load and find duplicates that ran in both files

[xml]$trx1 = Get-Content "path/to/file1.trx"
[xml]$trx2 = Get-Content "path/to/file2.trx"

$r1 = $trx1.TestRun.Results.UnitTestResult
$r2 = $trx2.TestRun.Results.UnitTestResult

# Build lookup: testName -> (outcome, duration) keeping best outcome per name
function Get-TestLookup($results) {
    $lookup = @{}
    foreach ($r in $results) {
        $name = $r.testName
        $outcome = $r.outcome
        $dur = [TimeSpan]::Parse($r.duration)
        if (-not $lookup.ContainsKey($name) -or ($lookup[$name].Outcome -eq 'NotExecuted' -and $outcome -ne 'NotExecuted')) {
            $lookup[$name] = [PSCustomObject]@{ Outcome = $outcome; Duration = $dur }
        }
    }
    $lookup
}

$t1 = Get-TestLookup $r1
$t2 = Get-TestLookup $r2

$skipped = @('NotExecuted','Pending','Disconnected','Warning','InProgress','Inconclusive')
$common = $t1.Keys | Where-Object { $t2.ContainsKey($_) -and $t1[$_].Outcome -notin $skipped -and $t2[$_].Outcome -notin $skipped }

Separate non-parametrized vs parametrized duplicates

Parametrized tests contain ( in their name (e.g., RunAllTests (Row: 0, Runner = net10.0, ...)). The base method name is everything before the first (.

$nonParam = $common | Where-Object { $_ -notmatch '\(' }
$param    = $common | Where-Object { $_ -match '\(' }

Non-parametrized duplicates ordered by duration

$nonParam | ForEach-Object {
    $d1 = $t1[$_].Duration; $d2 = $t2[$_].Duration
    [PSCustomObject]@{
        Test       = $_
        File1Sec   = $d1.TotalSeconds
        File2Sec   = $d2.TotalSeconds
        TotalSec   = $d1.TotalSeconds + $d2.TotalSeconds
    }
} | Sort-Object TotalSec -Descending |
  Format-Table @{L='File1';E={'{0,6:N1}' -f $_.File1Sec}},
               @{L='File2';E={'{0,6:N1}' -f $_.File2Sec}},
               @{L='Total';E={'{0,6:N1}' -f $_.TotalSec}}, Test -AutoSize

Parametrized duplicates squashed by base method

Tests with (Row: ...) or other parameterization are instances of the same test. Squash them into one row per base method, showing variant count, max single-instance duration, and total duration across all instances in both files.

$param | ForEach-Object {
    if ($_ -match '^(.+?)\s*\(') { $base = $Matches[1] } else { $base = $_ }
    $d1 = $t1[$_].Duration; $d2 = $t2[$_].Duration
    [PSCustomObject]@{ Base = $base; D1 = $d1.TotalSeconds; D2 = $d2.TotalSeconds; Max = [Math]::Max($d1.TotalSeconds, $d2.TotalSeconds) }
} | Group-Object Base | ForEach-Object {
    [PSCustomObject]@{
        Test         = $_.Name
        Variants     = $_.Count
        OneInstance   = ($_.Group | Measure-Object Max -Maximum).Maximum
        AllInstances  = ($_.Group | Measure-Object { $_.D1 + $_.D2 } -Sum).Sum
    }
} | Sort-Object AllInstances -Descending |
  Format-Table @{L='Variants';E={$_.Variants}},
               @{L='1 Instance';E={'{0,7:N1}s' -f $_.OneInstance}},
               @{L='All Instances';E={'{0,7:N1}s' -f $_.AllInstances}}, Test -AutoSize

Tips

Parameterized tests appear as separate UnitTestResult entries. Use regex '^(\S+?)[\s(]' to extract the base method name.
Sort by TotalSec (runs × avg duration) to find tests that consume the most CI time overall, even if each individual run is fast.
When comparing files, filter out NotExecuted tests — many parameterized tests are skipped in one configuration but not the other, so raw name overlap overstates true duplication.
TRX files from CI are typically found in TestResults/ or as pipeline artifacts.

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How to use it

Copy the folder

Take microsoft/trx-analysis from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

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