pipeline-investigation

pipeline-investigation is a skill for Claude Code from ANcpLua/ancplua-claude-plugins. It costs 159 tokens per session (4,334 once invoked), scanned A, original, MIT.

A guide for investigating failures in Azure DevOps pipelines, which automate building and checking software. It covers failures outside Helix tests, such as build errors, infrastructure crashes, flaky validation tests, scan failures, and missing artifacts.

In plain words
What is it for?
Use it to find why an Azure DevOps build failed, inspect task logs, measure how often a failure occurs, and assess overall pipeline health.
Why use it?
It helps identify the actual failing pipeline step instead of treating every later error as a separate problem caused by the same failed build.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the dotnet-dnceng plugin — 10 skills, 1 agent shipped together

Good fit Use it to find why an Azure DevOps build failed, inspect task logs, measure how often a failure occurs, and assess overall pipeline health.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ancplua/ancplua-claude-plugins/pipeline-investigation
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add ANcpLua/ancplua-claude-plugins --skill pipeline-investigation
Clone the repo
git clone --depth 1 https://github.com/ANcpLua/ancplua-claude-plugins

Made for: Claude Code.

Or install dotnet-dnceng, the plugin that ships this one along with the rest of its 10 skills, 1 agent.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for pipeline-investigation

README.md
[![agentmods](https://agentmods.dev/badge/skills/ancplua/ancplua-claude-plugins/pipeline-investigation/github.svg)](https://agentmods.dev/skills/ancplua/ancplua-claude-plugins/pipeline-investigation)
Your own site
<a href="https://agentmods.dev/skills/ancplua/ancplua-claude-plugins/pipeline-investigation"><img src="https://agentmods.dev/badge/skills/ancplua/ancplua-claude-plugins/pipeline-investigation/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for pipeline-investigation

Your own site · 80×15
<a href="https://agentmods.dev/skills/ancplua/ancplua-claude-plugins/pipeline-investigation"><img src="https://agentmods.dev/badge/skills/ancplua/ancplua-claude-plugins/pipeline-investigation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 159 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,334 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00159 $0.04334
Opus 5 $0.00079 $0.02167
Sonnet 5 $0.00032 $0.00867
Haiku 4.5 $0.00016 $0.00433

Measured 12d ago against content hash f8b808a0ab68, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

pipeline-investigation scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- `curl` for downloading task logs and build artifacts
plugins/dotnet-dnceng/skills/pipeline-investigation/SKILL.md · 317 lines

How it starts

The opening of the file, as written. The whole thing — 317 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Pipeline Investigation

Investigate AzDO pipeline failures that aren't Helix test failures — build errors, infrastructure tooling crashes, validation test flakiness, and artifact cascade failures. Complements helix-investigation by covering everything else in the pipeline.

When to Use This Skill

  • User has an AzDO build URL with a non-Helix failure (build step, validation, infra task)
  • User asks "why did the pipeline fail" and the failure is in a build/scan/validation task
  • User wants to know how often a specific failure occurs (frequency/trend analysis)
  • User sees exit code null, 1ES PT errors, or MSBuild failures
  • User wants to understand artifact cascade failures ("missing artifacts from prior build")
  • User asks about SourcelinkTests, Binary Analysis Scan, or installer validation failures

Output Formats

This skill produces two distinct report types. Match the format to the request:

Health Assessment ("pipeline health", "are builds passing", "pipeline status")

Follow references/health-assessment-format.md. Output MUST include these two tables:

  1. Failed Builds Table — every failed build, classified and investigated: | Build | Type | Source | Failure Detail |

    • Type: Rolling, Forward Flow, or Other PR (classify via gh pr view)
    • Source: Rolling → branch name. Forward Flow → target ← source-repo. Other PR → short description.
  2. Summary Table — pass/fail breakdown by build type: | Type | Completed | ✅ Pass | ❌ Fail | Pass Rate |

  3. Failure Trends Table (conditional — include when 3+ builds in scope and at least one pattern recurs; cap at top 5): | Pattern | Hits | Window | Status |

    • Status: ❌ No issue filed, ✅ Fix merged, 🔄 Known issue (link), ⏳ Fix in progress

See the reference for build classification rules, branch filtering, and codeflow analysis methodology.

Save the report: After presenting the health assessment, save it to reviews/pipeline-health-<slug>-YYYY-MM-DD-HHMM.md in the repo, where <slug> identifies the pipeline or scope (e.g., unified-build, runtime-ci). Include the timestamp to ensure uniqueness across multiple investigations per day. Include a Methodology section at the end documenting data sources and classification approach.

Read the full file on GitHub · 317 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 317 lines · 159 tokens per session scan A f8b808a0ab68

Subscribe to this mod's changes

pipeline-investigation is a skill published in the GitHub repository ANcpLua/ancplua-claude-plugins (6 stars, last pushed 26d ago), licensed MIT. It adds 159 tokens to every session and 4,334 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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