Official agent skill

Macios CI Postmortem

Post-mortem analysis of CI failures across recent PRs in dotnet/macios.

OfficialCustom licenceAuto-check passedTesting & QA

Install Macios CI Postmortem

skills CLI

$ npx skills add dotnet/macios --skill macios-ci-postmortem -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install dotnet/macios macios-ci-postmortem --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/dotnet/macios.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/macios-ci-postmortem .claude/skills/macios-ci-postmortem && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "macios-ci-postmortem" agent skill from https://github.com/dotnet/macios/tree/main/.agents/skills/macios-ci-postmortem into .claude/skills/macios-ci-postmortem/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "macios-ci-postmortem", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/dotnet/macios/tree/main/.agents/skills/macios-ci-postmortem

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add dotnet/macios --skill macios-ci-postmortem -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install dotnet/macios macios-ci-postmortem --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/dotnet/macios.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/macios-ci-postmortem .agents/skills/macios-ci-postmortem && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "macios-ci-postmortem" agent skill from https://github.com/dotnet/macios/tree/main/.agents/skills/macios-ci-postmortem into .agents/skills/macios-ci-postmortem/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "macios-ci-postmortem", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add dotnet/macios --skill macios-ci-postmortem -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install dotnet/macios macios-ci-postmortem --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/dotnet/macios.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/macios-ci-postmortem .cursor/skills/macios-ci-postmortem && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "macios-ci-postmortem" agent skill from https://github.com/dotnet/macios/tree/main/.agents/skills/macios-ci-postmortem into .cursor/skills/macios-ci-postmortem/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "macios-ci-postmortem", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/dotnet/macios.git --path .agents/skills/macios-ci-postmortem

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add dotnet/macios --skill macios-ci-postmortem -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install dotnet/macios macios-ci-postmortem --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/dotnet/macios.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/macios-ci-postmortem .gemini/skills/macios-ci-postmortem && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "macios-ci-postmortem" agent skill from https://github.com/dotnet/macios/tree/main/.agents/skills/macios-ci-postmortem into .gemini/skills/macios-ci-postmortem/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "macios-ci-postmortem", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install dotnet/macios macios-ci-postmortem

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add dotnet/macios --skill macios-ci-postmortem -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/dotnet/macios.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/macios-ci-postmortem .github/skills/macios-ci-postmortem && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "macios-ci-postmortem" agent skill from https://github.com/dotnet/macios/tree/main/.agents/skills/macios-ci-postmortem into .github/skills/macios-ci-postmortem/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "macios-ci-postmortem", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add dotnet/macios --skill macios-ci-postmortem -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install dotnet/macios macios-ci-postmortem --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/dotnet/macios.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/macios-ci-postmortem .opencode/skills/macios-ci-postmortem && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "macios-ci-postmortem" agent skill from https://github.com/dotnet/macios/tree/main/.agents/skills/macios-ci-postmortem into .opencode/skills/macios-ci-postmortem/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "macios-ci-postmortem", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: macios-ci-postmortem
GitHub stars: 2.9k
Token cost: ~7.8k tokens
SKILL.md length: 2,441 words
Files: 2 (incl. references)
Skills in repo: 9
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: Custom licence

At a glance

Post-mortem analysis of CI failures across recent PRs in dotnet/macios.

Works in 4 steps: Discovery — Collect Recent Builds → Extraction — Get Failure Details → Classification → …
Asked to find flaky tests
SKILL.md covers References, Overview, Phase 1: Discovery — Collect… and Phase 2: Extraction — Get…, plus 2 more sections
Calls az, gh and python3; reaches devdiv.visualstudio.com

What it does

Macios CI Postmortem is an agent skill from dotnet/macios, published by the product's own GitHub organization. Post-mortem analysis of CI failures across recent PRs in dotnet/macios. Identifies flaky tests, infrastructure issues, and shared regressions by analyzing builds from the last week. Files or updates GitHub issues for failures unrelated to any specific PR. Use when asked to "find flaky tests", "CI post-mortem", "what's been failing in CI", or "file issues for flaky failures".

Its SKILL.md is about 7.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/azure-devops-cli.md`).

It sits in Testing & QA, covering Failing and flaky tests and Runbooks and postmortems. It works with .NET, GitHub and C#. The repository describes itself as: .NET for iOS, Mac Catalyst, macOS, and tvOS provide open-source bindings of the Apple SDKs for use with .NET managed languages such as C.

When your agent uses it

Asked to find flaky tests
Whats been failing in CI
File issues for flaky failures

Example prompts

“find flaky tests”
“CI post-mortem”
“s been failing in CI”
“/macios-ci-postmortem”

Requirements

Python 3

Workflow steps

4 steps, taken from the step headings in SKILL.md.

Discovery — Collect Recent Builds
Extraction — Get Failure Details
Classification
Issue Actions

What it can do on your machine

Read from SKILL.md and the folder at commit 354c2a6. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- az
- gh
- python3
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
- devdiv.visualstudio.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Macios CI Postmortem loads about 7.8k tokens when it runs, and up to ~8.7k if it reads all its reference files. Until then it costs about 100 tokens; SKILL.md has 2,441 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~100
When it runs · the whole SKILL.md, loaded when a task matches: ~7.8k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~8.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 2,441 words (~7,782 tokens).

“Analyze CI failures across recent PRs to identify flaky tests, infrastructure issues, and shared regressions that are not caused by any specific PR. File or update GitHub issues for these.”

— opening of SKILL.md by dotnet, Custom licence

name: macios-ci-postmortem

Outline of SKILL.md

macios CI Post-Mortem
References
Overview
Phase 1: Discovery — Collect Recent Builds
Step 1.1: List recent PR-validation builds
Step 1.2: Parse and filter builds
Step 1.3: Group builds for rerun detection
Phase 2: Extraction — Get Failure Details
Step 2.1: Set up failure tracking
Step 2.2: For each build, get the timeline and TestSummary artifacts
Step 2.3: Download TestSummary artifacts (fast triage)
Step 2.4: Download HtmlReport artifacts (deep analysis)
Step 2.5: Parse NUnit XML for individual test failures
Step 2.6: Handle crashes and build failures
Step 2.6a: Collect detailed information for build failures
Step 2.7: For infrastructure/setup failures without TestSummary
Step 2.8: Normalize failure signatures
Phase 3: Classification
Step 3.1: Identify flaky tests (same commit, different outcomes)
Step 3.2: Identify shared regressions (same failure across unrelated PRs)
Step 3.3: Identify infrastructure failures and bot-specific issues
Step 3.4: Exclude known-noisy and PR-specific failures
Step 3.5: File one issue per test
Step 3.5: Produce classification summary
Phase 4: Issue Actions
Step 4.1: Search for existing issues
Step 4.2: Collect issue-specific information
Step 4.3: Decide whether to reopen closed issues
Step 4.4: Propose actions to the user
Step 4.5: Execute confirmed actions

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file (references) in .agents/skills/macios-ci-postmortem of dotnet/macios.

SKILL.md
references/azure-devops-cli.md

Open the folder on GitHubat commit 354c2a6

Compare with similar skills

Macios CI Postmortem next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Macios CI Postmortem compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Macios CI Postmortem this skilldotnet/macios	2.9k	—	~7.8k	Automated safety check: Pass	Custom licence	today
MAUI CI Investigatordotnet/maui	23k	—	~2k	Automated safety check: Pass	MIT	today
MAUI UI Test Writerdotnet/maui	23k	—	~3k	Automated safety check: Pass	MIT	today
GreptimeDB Fuzz CI Failure InvestigationGreptimeTeam/greptimedb	6.7k	—	~4.4k	Automated safety check: Pass	Apache-2.0	2 days ago
Code Reviewjonathanpeppers/dotnes	780	—	~2.1k	Automated safety check: Pass	MIT	13 days ago
Release Roslynatordotnet/roslynator	3.5k	—	~1k	Automated safety check: Pass	Custom licence	2 days ago

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Questions about Macios CI Postmortem

What does Macios CI Postmortem do?

Post-mortem analysis of CI failures across recent PRs in dotnet/macios. Macios CI Postmortem is an agent skill from dotnet/macios, published by the product's own GitHub organization. Post-mortem analysis of CI failures across recent PRs in dotnet/macios.

When should I use Macios CI Postmortem?

Macios CI Postmortem fits situations like: asked to find flaky tests; whats been failing in CI; file issues for flaky failures.

How do I install Macios CI Postmortem in Claude Code?

Run `npx skills add dotnet/macios --skill macios-ci-postmortem -a claude-code`. Or copy the skill folder (.agents/skills/macios-ci-postmortem in dotnet/macios) into .claude/skills/macios-ci-postmortem in your project. Claude Code loads it when a task matches its description.

How do I install Macios CI Postmortem in Codex?

Run `npx skills add dotnet/macios --skill macios-ci-postmortem -a codex`. Or copy the skill folder (.agents/skills/macios-ci-postmortem in dotnet/macios) into .agents/skills/macios-ci-postmortem in your project. Codex loads it when a task matches its description.

Can I use Macios CI Postmortem in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add dotnet/macios --skill macios-ci-postmortem -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/macios-ci-postmortem, .gemini/skills/macios-ci-postmortem, .github/skills/macios-ci-postmortem and .opencode/skills/macios-ci-postmortem in your project.

What does Macios CI Postmortem need to run?

Going by SKILL.md and its folder, Macios CI Postmortem needs the command-line tools its instructions call (az, gh and python3). Our summary lists: Python 3.

Does Macios CI Postmortem access the network?

SKILL.md names 1 domain. In commands or code: devdiv.visualstudio.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Macios CI Postmortem safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Macios CI Postmortem use?

Macios CI Postmortem has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Macios CI Postmortem use?

About 7.8k tokens (SKILL.md is roughly 31k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 876 tokens, read only when the agent opens those files.

What are the alternatives to Macios CI Postmortem?

Skills that share tags, products or a category with Macios CI Postmortem: MAUI CI Investigator (dotnet/maui, 23k stars), MAUI UI Test Writer (dotnet/maui, 23k stars), GreptimeDB Fuzz CI Failure Investigation (GreptimeTeam/greptimedb, 6.7k stars) and Code Review (jonathanpeppers/dotnes, 780 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Macios CI Postmortem?

dotnet (a GitHub organization, an official publisher) maintains it in dotnet/macios, which has 2,906 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on October 7, 2026.

Source: dotnet/macios on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Macios CI Postmortem

Install Macios CI Postmortem

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

MAUI CI Investigator

MAUI UI Test Writer

GreptimeDB Fuzz CI Failure Investigation

Code Review

Release Roslynator

Babysit PR

More from dotnet/macios

Code Review

Macios CI Failure Inspector

Macios Xcode Beta Update

Fix Random CI Test Failure

Gh Stack

Macios Binding Creator

Questions about Macios CI Postmortem

Install Macios CI Postmortem

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

More from dotnet/macios

Related

Questions about Macios CI Postmortem