MAUI CI Investigator
dotnet/maui
Adds dotnet/maui-specific context for investigating failing PR checks and broken nightly builds: pipelines, Helix logs, binlogs and merge-readiness verdicts.
Suggests using Microsoft Testing Platform (MTP) hot reload to iterate fixes on failing tests without rebuilding.
Install Mtp Hot Reload
$ npx skills add microsoft/testfx --skill mtp-hot-reload -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install microsoft/testfx mtp-hot-reload --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/microsoft/testfx.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/mtp-hot-reload .claude/skills/mtp-hot-reload && rm -rf skills-srcUse ~/.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/
Install the "mtp-hot-reload" agent skill from https://github.com/microsoft/testfx/tree/main/.agents/skills/mtp-hot-reload into .claude/skills/mtp-hot-reload/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mtp-hot-reload", 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 install https://github.com/microsoft/testfx/tree/main/.agents/skills/mtp-hot-reloadType 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.
$ npx skills add microsoft/testfx --skill mtp-hot-reload -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install microsoft/testfx mtp-hot-reload --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/microsoft/testfx.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/mtp-hot-reload .agents/skills/mtp-hot-reload && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "mtp-hot-reload" agent skill from https://github.com/microsoft/testfx/tree/main/.agents/skills/mtp-hot-reload into .agents/skills/mtp-hot-reload/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mtp-hot-reload", 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.
$ npx skills add microsoft/testfx --skill mtp-hot-reload -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install microsoft/testfx mtp-hot-reload --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/microsoft/testfx.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/mtp-hot-reload .cursor/skills/mtp-hot-reload && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "mtp-hot-reload" agent skill from https://github.com/microsoft/testfx/tree/main/.agents/skills/mtp-hot-reload into .cursor/skills/mtp-hot-reload/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mtp-hot-reload", 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 https://github.com/microsoft/testfx.git --path .agents/skills/mtp-hot-reload--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add microsoft/testfx --skill mtp-hot-reload -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install microsoft/testfx mtp-hot-reload --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/microsoft/testfx.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/mtp-hot-reload .gemini/skills/mtp-hot-reload && rm -rf skills-srcUse ~/.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/
Install the "mtp-hot-reload" agent skill from https://github.com/microsoft/testfx/tree/main/.agents/skills/mtp-hot-reload into .gemini/skills/mtp-hot-reload/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mtp-hot-reload", 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.
$ gh skill install microsoft/testfx mtp-hot-reloadInstalls 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).
$ npx skills add microsoft/testfx --skill mtp-hot-reload -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/microsoft/testfx.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/mtp-hot-reload .github/skills/mtp-hot-reload && rm -rf skills-srcUse ~/.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/
Install the "mtp-hot-reload" agent skill from https://github.com/microsoft/testfx/tree/main/.agents/skills/mtp-hot-reload into .github/skills/mtp-hot-reload/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mtp-hot-reload", 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.
$ npx skills add microsoft/testfx --skill mtp-hot-reload -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install microsoft/testfx mtp-hot-reload --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/microsoft/testfx.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/mtp-hot-reload .opencode/skills/mtp-hot-reload && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "mtp-hot-reload" agent skill from https://github.com/microsoft/testfx/tree/main/.agents/skills/mtp-hot-reload into .opencode/skills/mtp-hot-reload/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mtp-hot-reload", 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
mtp-hot-reload- GitHub stars
- 1k
- Token cost
- ~1.5k tokens
- SKILL.md length
- 654 words
- Files
- 1
- Skills in repo
- 50
- Repo updated
- First seen
- Licence
- MIT
At a glance
Suggests using Microsoft Testing Platform (MTP) hot reload to iterate fixes on failing tests without rebuilding.
- Works in 6 steps: Verify the project uses Microsoft… → Add the hot reload NuGet package → Enable hot reload → …
- User says hot reload tests
- SKILL.md covers When to Use, When Not to Use, Inputs and Workflow, plus 2 more sections
- Calls dotnet
What it does
Mtp Hot Reload is an agent skill from microsoft/testfx, published by the product's own GitHub organization. Suggests using Microsoft Testing Platform (MTP) hot reload to iterate fixes on failing tests without rebuilding. Use when user says "hot reload tests", "iterate on test fix", "run tests without rebuilding", "speed up test loop", "fix test faster", or needs to set up MTP hot reload to rapidly iterate on test failures. Covers setup (NuGet package, environment variable, launchSettings.json) and the iterative workflow for fixing tests. DO NOT USE FOR: writing test code, diagnosing test failures, running tests…
Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in DevOps & Cloud, covering Failing and flaky tests, Secrets management and CI/CD. It works with .NET. The repository describes itself as: This repository holds the source code of Microsoft.Testing.Platform (MTP), a lightweight alternative to VSTest, as well as MSTest adapter and framework. The licence is MIT.
When your agent uses it
- User says hot reload tests
- Iterate on test fix
- Run tests without rebuilding
- Speed up test loop
Example prompts
- “hot reload tests”
- “iterate on test fix”
- “run tests without rebuilding”
- “/mtp-hot-reload”
Workflow steps
6 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 19d717a. 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:
dotnet
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
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
Mtp Hot Reload loads about 1.5k tokens when it runs. Until then it costs about 180 tokens; SKILL.md has 654 words of instructions outside code blocks.
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
The full file from microsoft/testfx at commit 19d717a, republished under its MIT licence (© microsoft). 654 words, ~1,504 tokens.
Download SKILL.mdSave it as
.claude/skills/mtp-hot-reload/SKILL.md (or your agent's skills folder).- name
- mtp-hot-reload
- description
- Suggests using Microsoft Testing Platform (MTP) hot reload to iterate fixes on failing tests without rebuilding. Use when user says "hot reload tests", "iterate on test fix", "run tests without rebuilding", "speed up test loop", "fix test faster", or needs to set up MTP hot reload to rapidly iterate on test failures. Covers setup (NuGet package, environment variable, launchSettings.json) and the iterative workflow for fixing tests. DO NOT USE FOR: writing test code, diagnosing test failures, running tests normally with dotnet test (use run-tests), applying test filters, producing TRX reports, CI/CD pipeline configuration, or Visual Studio Test Explorer hot reload (which is a different feature).
- license
- MIT
MTP Hot Reload for Iterative Test Fixing
Set up and use Microsoft Testing Platform hot reload to rapidly iterate fixes on failing tests without rebuilding between each change.
When to Use
- User has one or more failing tests and wants to iterate fixes quickly
- User wants to avoid rebuild overhead while fixing test code or production code
- User asks about hot reload for tests or speeding up the test-fix loop
- User needs to set up MTP hot reload in their project
When Not to Use
- User needs to write new tests from scratch (use general coding assistance)
- User needs to diagnose why a test is failing (use diagnostic skills)
- User wants Visual Studio Test Explorer hot reload (different feature, built into VS)
- Project uses VSTest -- hot reload requires Microsoft Testing Platform (MTP)
- User needs CI/CD pipeline configuration
Inputs
| Input | Required | Description |
|---|---|---|
| Test project path | No | Path to the test project (.csproj). Defaults to current directory. |
| Failing test name or filter | No | Specific test(s) to iterate on |
Workflow
Step 1: Verify the project uses Microsoft Testing Platform
Hot reload requires MTP. It does not work with VSTest.
Follow the detection procedure in the platform-detection skill to determine the test platform.
If the project uses VSTest, inform the user that MTP hot reload is not available and suggest migrating to MTP first (see migrate-vstest-to-mtp), or using Visual Studio's built-in Test Explorer hot reload feature instead.
Step 2: Add the hot reload NuGet package
Install the Microsoft.Testing.Extensions.HotReload package:
dotnet add <project-path> package Microsoft.Testing.Extensions.HotReloadNote: When using
Microsoft.Testing.Platform.MSBuild(included transitively by MSTest, NUnit, and xUnit runners), the extension is auto-registered when you install its NuGet package -- no code changes needed.
Step 3: Enable hot reload
Hot reload is activated by setting the TESTINGPLATFORM_HOTRELOAD_ENABLED environment variable to 1.
Option A -- Set it in the shell before running tests:
# PowerShell
$env:TESTINGPLATFORM_HOTRELOAD_ENABLED = "1"
# bash/zsh
export TESTINGPLATFORM_HOTRELOAD_ENABLED=1Option B -- Add it to launchSettings.json (recommended for repeatable use):
Create or update Properties/launchSettings.json in the test project:
{
"profiles": {
"<ProjectName>": {
"commandName": "Project",
"environmentVariables": {
"TESTINGPLATFORM_HOTRELOAD_ENABLED": "1"
}
}
}
}Step 4: Run the tests with hot reload
Run the test project directly (not through dotnet test) to use hot reload in console mode:
dotnet run --project <project-path>To filter to specific failing tests, pass the filter after --. The syntax depends on the test framework -- see the filter-syntax skill for full details. Quick examples:
| Framework | Filter syntax |
|---|---|
| MSTest | dotnet run --project <path> -- --filter "FullyQualifiedName~TestMethodName" |
| NUnit | dotnet run --project <path> -- --filter "FullyQualifiedName~TestMethodName" |
| xUnit v3 | dotnet run --project <path> -- --filter-method "*TestMethodName" |
| TUnit | dotnet run --project <path> -- --treenode-filter "/*/*/ClassName/TestMethodName" |
The test host will start, run the tests, and remain running waiting for code changes.
Show full SKILL.md (241 more words)Show less
Step 5: Iterate on the fix
- Edit the source code (test code or production code) in your editor
- The test host detects the changes and re-runs the affected tests automatically
- Review the updated results in the console
- Repeat until all targeted tests pass
Important: Hot reload currently works in console mode only. There is no support for hot reload in Test Explorer for Visual Studio or Visual Studio Code.
Step 6: Finalize
Once all tests pass:
- Stop the test host (Ctrl+C)
- Run a full
dotnet testto confirm all tests pass with a clean build - Optionally remove
TESTINGPLATFORM_HOTRELOAD_ENABLEDfrom the environment or keeplaunchSettings.jsonfor future use
Validation
- Project uses Microsoft Testing Platform (not VSTest)
-
Microsoft.Testing.Extensions.HotReloadpackage is installed -
TESTINGPLATFORM_HOTRELOAD_ENABLEDenvironment variable is set to1 - Tests run and the host remains active waiting for changes
- Code changes are picked up without manual restart
Common Pitfalls
| Pitfall | Solution |
|---|---|
Using dotnet test instead of dotnet run | Hot reload requires dotnet run --project <path> to run the test host directly in console mode |
| Project uses VSTest, not MTP | Hot reload requires MTP. Migrate to MTP first or use VS Test Explorer hot reload |
| Forgetting to set the environment variable | Set TESTINGPLATFORM_HOTRELOAD_ENABLED=1 before running |
| Expecting Test Explorer integration | Console mode only -- no VS/VS Code Test Explorer support |
| Making unsupported code changes (rude edits) | Some changes (adding new types, changing method signatures) require a restart. Stop and re-run |
© microsoft, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .agents/skills/mtp-hot-reload of microsoft/testfx.
Open the folder on GitHubat commit 19d717a
Compare with similar skills
Mtp Hot Reload 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Mtp Hot Reload this skillmicrosoft/testfx | 1k | — | ~1.5k | Automated safety check: Pass | MIT | |
| MAUI CI Investigatordotnet/maui | 23k | — | ~2k | Automated safety check: Pass | MIT | |
| Azure Pipelines Log Downloaderansible/ansible | 71k | — | ~825 | Automated safety check: Pass | GPL-3.0 | |
| CI Failure Triage and RepairChachamaru127/claude-code-harness | 3.2k | 1 repos | ~1.1k | Automated safety check: Notes | MIT | |
| CI Watchdoglatitude-dev/latitude-llm | 4.7k | — | ~1.6k | Automated safety check: Pass | MIT | |
| Megatron-LM CI Failure TriageNVIDIA/Megatron-LM | 18k | — | ~1.6k | Automated safety check: Pass | Apache-2.0 |
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Related
Works with
Categories
Questions about Mtp Hot Reload
What does Mtp Hot Reload do?
Suggests using Microsoft Testing Platform (MTP) hot reload to iterate fixes on failing tests without rebuilding. Mtp Hot Reload is an agent skill from microsoft/testfx, published by the product's own GitHub organization. Suggests using Microsoft Testing Platform (MTP) hot reload to iterate fixes on failing tests without rebuilding.
When should I use Mtp Hot Reload?
Mtp Hot Reload fits situations like: user says hot reload tests; iterate on test fix; run tests without rebuilding; speed up test loop.
How do I install Mtp Hot Reload in Claude Code?
Run `npx skills add microsoft/testfx --skill mtp-hot-reload -a claude-code`. Or copy the skill folder (.agents/skills/mtp-hot-reload in microsoft/testfx) into .claude/skills/mtp-hot-reload in your project. Claude Code loads it when a task matches its description.
How do I install Mtp Hot Reload in Codex?
Run `npx skills add microsoft/testfx --skill mtp-hot-reload -a codex`. Or copy the skill folder (.agents/skills/mtp-hot-reload in microsoft/testfx) into .agents/skills/mtp-hot-reload in your project. Codex loads it when a task matches its description.
Can I use Mtp Hot Reload 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 microsoft/testfx --skill mtp-hot-reload -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mtp-hot-reload, .gemini/skills/mtp-hot-reload, .github/skills/mtp-hot-reload and .opencode/skills/mtp-hot-reload in your project.
What does Mtp Hot Reload need to run?
Going by SKILL.md and its folder, Mtp Hot Reload needs the command-line tools its instructions call (dotnet).
Does Mtp Hot Reload access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Mtp Hot Reload 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 Mtp Hot Reload use?
Mtp Hot Reload is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Mtp Hot Reload use?
About 1.5k tokens (SKILL.md is roughly 6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Mtp Hot Reload?
Skills that share tags, products or a category with Mtp Hot Reload: MAUI CI Investigator (dotnet/maui, 23k stars), Azure Pipelines Log Downloader (ansible/ansible, 71k stars), CI Failure Triage and Repair (Chachamaru127/claude-code-harness, 3.2k stars) and CI Watchdog (latitude-dev/latitude-llm, 4.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Mtp Hot Reload?
microsoft (a GitHub organization, an official publisher) maintains it in microsoft/testfx, which has 1,047 GitHub stars. The repository holds 50 skills in this directory. The repository was last updated on October 9, 2026.
Source: microsoft/testfx on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.