PR Deep Verification
QwenLM/qwen-code
Runs a sandboxed, evidence-based check of one qwen-code pull request, proving its main change against the base build and writing a report with a machine-readable verdict.
Checks a pull request for lines that undo a recent bug fix by comparing what the PR removes with what labeled bug-fix PRs added to the same files.
Install Find Regression Risk
$ npx skills add dotnet/maui --skill find-regression-risk -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install dotnet/maui find-regression-risk --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/dotnet/maui.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.github/skills/find-regression-risk .claude/skills/find-regression-risk && 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 "find-regression-risk" agent skill from https://github.com/dotnet/maui/tree/main/.github/skills/find-regression-risk into .claude/skills/find-regression-risk/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-regression-risk", 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/dotnet/maui/tree/main/.github/skills/find-regression-riskType 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 dotnet/maui --skill find-regression-risk -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install dotnet/maui find-regression-risk --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dotnet/maui.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.github/skills/find-regression-risk .agents/skills/find-regression-risk && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "find-regression-risk" agent skill from https://github.com/dotnet/maui/tree/main/.github/skills/find-regression-risk into .agents/skills/find-regression-risk/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-regression-risk", 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 dotnet/maui --skill find-regression-risk -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install dotnet/maui find-regression-risk --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dotnet/maui.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.github/skills/find-regression-risk .cursor/skills/find-regression-risk && 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 "find-regression-risk" agent skill from https://github.com/dotnet/maui/tree/main/.github/skills/find-regression-risk into .cursor/skills/find-regression-risk/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-regression-risk", 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/dotnet/maui.git --path .github/skills/find-regression-risk--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 dotnet/maui --skill find-regression-risk -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install dotnet/maui find-regression-risk --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dotnet/maui.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.github/skills/find-regression-risk .gemini/skills/find-regression-risk && 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 "find-regression-risk" agent skill from https://github.com/dotnet/maui/tree/main/.github/skills/find-regression-risk into .gemini/skills/find-regression-risk/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-regression-risk", 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 dotnet/maui find-regression-riskInstalls 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 dotnet/maui --skill find-regression-risk -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/dotnet/maui.git skills-src && mkdir -p .github/skills && cp -r skills-src/.github/skills/find-regression-risk .github/skills/find-regression-risk && 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 "find-regression-risk" agent skill from https://github.com/dotnet/maui/tree/main/.github/skills/find-regression-risk into .github/skills/find-regression-risk/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-regression-risk", 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 dotnet/maui --skill find-regression-risk -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install dotnet/maui find-regression-risk --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dotnet/maui.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.github/skills/find-regression-risk .opencode/skills/find-regression-risk && 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 "find-regression-risk" agent skill from https://github.com/dotnet/maui/tree/main/.github/skills/find-regression-risk into .opencode/skills/find-regression-risk/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-regression-risk", 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
find-regression-risk- GitHub stars
- 23k
- Token cost
- ~1.1k tokens
- SKILL.md length
- 372 words
- Files
- 1
- Skills in repo
- 27
- Repo updated
- First seen
- Licence
- MIT
At a glance
Checks a pull request for lines that undo a recent bug fix by comparing what the PR removes with what labeled bug-fix PRs added to the same files.
- Works in 5 steps: PR diff — collects lines REMOVED by the… → Git history — git log --follow… → Label filter — keeps PRs (or their… → …
- Checking whether a pull request reverts an earlier bug fix
- SKILL.md covers How It Works, Standalone Invocation, Parameters and Outputs, plus 3 more sections
- Calls pwsh, git and dotnet
What it does
This skill runs a mechanical, script-based check with no AI or LLM involved. It collects the lines a PR removes, uses git log over a recent window to find earlier PRs that touched the same files, keeps those labeled i/regression, t/bug, p/0 or p/1, and compares the lines those fixes added with what the current PR deletes, ignoring whitespace.
The verdict is REVERT when a removed line matches a line a fix added, OVERLAP when the same file was changed without an exact match, and CLEAN when no bug-fix PR touched the files. With an output directory it writes result.txt, risks.json, a content.md summary for a PR comment and optionally inline-findings.json. Parameters set the repository, file list, history window in months, a per-file cap on recent PRs and the base branch.
It runs through Find-RegressionRisks.ps1 and is wired into the dotnet/maui review script as a step after UI test detection and before the Gate step; when a REVERT is found, the regression tests from the reverted fixes are executed. It is not meant for release-readiness checks, CI failure investigation or general code review.
When your agent uses it
- Checking whether a pull request reverts an earlier bug fix
- Adding a regression cross-reference step to an automated PR review
- Producing a summary comment of regression risks for a PR
Example prompts
- “Does PR 33908 revert a previous fix? Check it for regression risk.”
- “Run the regression risk script on my PR and write the results to ./out.”
- “Look at the files this change touches and tell me whether any recent bug-fix PRs overlap.”
Requirements
- PowerShell (pwsh)
- git
- GitHub CLI (gh) authenticated against the target repository
- Compatibility (from SKILL.md): Requires PowerShell (pwsh), git, and GitHub CLI (gh) authenticated against the target repository.
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- PR diff — collects lines REMOVED by the PR under review.
- Git history — git log --follow --since=6mo finds recent PRs that touched the same files.
- Label filter — keeps PRs (or their linked issues) labeled i/regression, t/bug, p/0, or p/1.
- Fix diff — fetches each fix PR's diff and collects lines it ADDED to the same file.
- Compare — whitespace-insensitive string equality
What it can do on your machine
Read from SKILL.md and the folder at commit b926f05. 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:
pwshgitdotnet
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.
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.
Compatibility
Requires PowerShell (pwsh), git, and GitHub CLI (gh) authenticated against the target repository.
From compatibility in the SKILL.md frontmatter.
Context cost
Find Regression Risk loads about 1.1k tokens when it runs. Until then it costs about 164 tokens; SKILL.md has 372 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 dotnet/maui at commit b926f05, republished under its MIT licence (© dotnet). 372 words, ~1,122 tokens.
Download SKILL.mdSave it as
.claude/skills/find-regression-risk/SKILL.md (or your agent's skills folder).- name
- find-regression-risk
- description
- Detects potential regression risks in a PR by cross-referencing lines the PR REMOVES against lines ADDED by recent labeled bug-fix PRs (`i/regression`, `t/bug`, `p/0`, `p/1`) touching the same files. Purely mechanical — no AI/LLM. Emits a CLEAN / OVERLAP / REVERT verdict plus structured findings. Triggers on: "does this PR revert a previous fix", "check PR for regression risk", "find regression risks in PR", "is this change reverting a bug fix". Do NOT use for: assessing ship-readiness of a release branch (use release-readiness), investigating CI failures (use azdo-build-investigator), or general code review (use code-review).
- compatibility
- Requires PowerShell (pwsh), git, and GitHub CLI (gh) authenticated against the target repository.
- metadata.author
- dotnet-maui
- metadata.version
- 1.0
find-regression-risk
Detects potential regression risks in a PR by cross-referencing removed lines against lines added by recent labeled bug-fix PRs.
How It Works
Purely mechanical — no AI/LLM. Five-step algorithm:
- PR diff — collects lines REMOVED by the PR under review.
- Git history —
git log --follow --since=6mofinds recent PRs that touched the same files. - Label filter — keeps PRs (or their linked issues) labeled
i/regression,t/bug,p/0, orp/1. - Fix diff — fetches each fix PR's diff and collects lines it ADDED to the same file.
- Compare — whitespace-insensitive string equality:
- 🔴 REVERT — removed line matches a line a fix PR added (highest risk).
- 🟡 OVERLAP — same file modified, but no exact line revert.
- 🟢 CLEAN — no bug-fix PRs touch the same files.
Standalone Invocation
# Analyze a specific PR (auto-detects files)
pwsh -NoProfile -Command '& ./.github/scripts/Find-RegressionRisks.ps1 -PRNumber 33908 -OutputDir /tmp/out'
# Analyze specific files only
pwsh -NoProfile -Command '& ./.github/scripts/Find-RegressionRisks.ps1 -PRNumber 33908 -OutputDir /tmp/out -FilePaths @("src/Core/src/Platform/Android/MauiWindowInsetListener.cs")'Parameters
| Parameter | Required | Default | Description |
|---|---|---|---|
-PRNumber | Yes | — | PR number to analyze |
-Repo | No | dotnet/maui | Repository in owner/name form |
-FilePaths | No | auto-detect | Implementation files to check |
-MonthsBack | No | 6 | History window for git log |
-MaxRecentPRsPerFile | No | 20 | Rate-limit guard per file |
-BaseBranch | No | main | Base branch for git log scope |
-OutputDir | No | — | Directory for output files |
-WriteInlineFindings | No | off | Emit inline-findings.json |
Outputs
When -OutputDir is specified:
result.txt— single token:CLEAN,OVERLAP, orREVERTrisks.json— structured findings for downstream agentscontent.md— markdown summary for the PR commentinline-findings.json— (only with-WriteInlineFindings) inline annotations
Show full SKILL.md (158 more words)Show less
Integration
The script runs as STEP 4 in Review-PR.ps1 (Regression Cross-Reference, after UI test detection and before the Gate step). Its content.md is assembled into the AI summary review by post-ai-summary-comment.ps1.
When REVERT risks are detected, the regression tests from the reverted fix PRs are executed:
- UI tests →
BuildAndRunHostApp.ps1 -Platform <plat> -TestFilter <filter> - Device tests →
Run-DeviceTests.ps1 -Project <proj> -Platform <plat> -TestFilter <filter> - Unit/XAML tests →
dotnet test <project> --filter <filter>
The expert reviewer agent (maui-expert-reviewer.md, dimension #6) reads risks.json to check for REVERT entries.
Known Limitations
- Inline findings: The
-WriteInlineFindingsflag emits deletion-side (LEFT) annotations, butpost-inline-review.ps1currently only posts RIGHT-side comments. LEFT-side findings are silently dropped. This is documented as future work. - Whitespace-only changes: By design, an indent-only change to a fix line won't trigger a REVERT (the normalization collapses whitespace). This avoids false positives from reformatting.
pwsh -Filearray parameters: When invoking standalone from bash, usepwsh -Command '& ./script.ps1 -FilePaths @(...)'syntax.pwsh -Filedoesn't evaluate@()expressions.
Tests
pwsh -NoProfile -File .github/scripts/tests/Test-FindRegressionRisks.ps1© dotnet, 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 .github/skills/find-regression-risk of dotnet/maui.
Open the folder on GitHubat commit b926f05
Compare with similar skills
Find Regression Risk 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 |
|---|---|---|---|---|---|---|
| Find Regression Risk this skilldotnet/maui | 23k | — | ~1.1k | Automated safety check: Pass | MIT | |
| PR Deep VerificationQwenLM/qwen-code | 28k | — | ~18k | Automated safety check: Pass | Apache-2.0 | |
| PR Review State Fetchprisma/orm | 48k | — | ~767 | Automated safety check: Pass | Apache-2.0 | |
| Greploop Appsmichaelshimeles/skills | 1.3k | 1 repos | ~3.6k | Automated safety check: Pass | MIT | |
| PR Triagertk-ai/rtk | 83k | — | ~2.5k | Automated safety check: Notes | Apache-2.0 | |
| Difit Reviewyoshiko-pg/difit | 3.2k | — | ~1.2k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Find Regression Risk
What does Find Regression Risk do?
Checks a pull request for lines that undo a recent bug fix by comparing what the PR removes with what labeled bug-fix PRs added to the same files. This skill runs a mechanical, script-based check with no AI or LLM involved. It collects the lines a PR removes, uses git log over a recent window to find earlier PRs that touched the same files, keeps those labeled i/regression, t/bug, p/0 or p/1, and compares the lines those fixes added with what the current PR deletes, ignoring whitespace.
When should I use Find Regression Risk?
Find Regression Risk fits situations like: checking whether a pull request reverts an earlier bug fix; adding a regression cross-reference step to an automated PR review; producing a summary comment of regression risks for a PR.
How do I install Find Regression Risk in Claude Code?
Run `npx skills add dotnet/maui --skill find-regression-risk -a claude-code`. Or copy the skill folder (.github/skills/find-regression-risk in dotnet/maui) into .claude/skills/find-regression-risk in your project. Claude Code loads it when a task matches its description.
How do I install Find Regression Risk in Codex?
Run `npx skills add dotnet/maui --skill find-regression-risk -a codex`. Or copy the skill folder (.github/skills/find-regression-risk in dotnet/maui) into .agents/skills/find-regression-risk in your project. Codex loads it when a task matches its description.
Can I use Find Regression Risk 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/maui --skill find-regression-risk -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/find-regression-risk, .gemini/skills/find-regression-risk, .github/skills/find-regression-risk and .opencode/skills/find-regression-risk in your project.
What does Find Regression Risk need to run?
Going by SKILL.md and its folder, Find Regression Risk needs the command-line tools its instructions call (pwsh, git and dotnet). Our summary lists: PowerShell (pwsh); git; GitHub CLI (gh) authenticated against the target repository. Compatibility (from SKILL.md): Requires PowerShell (pwsh), git, and GitHub CLI (gh) authenticated against the target repository..
Does Find Regression Risk access the network?
SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Find Regression Risk 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 Find Regression Risk use?
Find Regression Risk is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Find Regression Risk use?
About 1.1k tokens (SKILL.md is roughly 4.5k 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 Find Regression Risk?
Skills that share tags, products or a category with Find Regression Risk: PR Deep Verification (QwenLM/qwen-code, 28k stars), PR Review State Fetch (prisma/orm, 48k stars), Greploop Apps (michaelshimeles/skills, 1.3k stars) and PR Triage (rtk-ai/rtk, 83k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Find Regression Risk?
dotnet (a GitHub organization, an official publisher) maintains it in dotnet/maui, which has 23,321 GitHub stars. The repository holds 27 skills in this directory. The repository was last updated on October 8, 2026.
Source: dotnet/maui on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.