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Agent skill

PR Explainer

by mastra-ai in mastra-ai/mastra

A skill your agent uses when creating an approachable, self-contained HTML review aid for a pull request; explaining what changed, why it matters, how it works, and how it fits into the broader…

Custom licenceAuto-check passedDevelopment

Install PR Explainer

skills CLI
$ npx skills add mastra-ai/mastra --skill pr-explainer -a claude-code

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

GitHub CLI
$ gh skill install mastra-ai/mastra pr-explainer --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/mastra-ai/mastra.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/pr-explainer .claude/skills/pr-explainer && 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/

Facts

Skill name
pr-explainer
GitHub stars
29k
Token cost
~1.4k tokens
SKILL.md length
652 words
Files
1
Skills in repo
44
Repo updated
First seen
Licence
Custom licence

At a glance

A skill your agent uses when creating an approachable, self-contained HTML review aid for a pull request; explaining what changed, why it matters, how it works, and how it fits into the broader…

  • Works in 4 steps: Understand the PR before writing HTML → Find the explanation path → Write for approachability → …
  • Creating an approachable
  • SKILL.md covers Required workflow, Recommended HTML structure, Diagrams and Focused diff snippets, plus 3 more sections
  • Calls git

What it does

PR Explainer is an agent skill from mastra-ai/mastra. Use when creating an approachable, self-contained HTML review aid for a pull request; explaining what changed, why it matters, how it works, and how it fits into the broader system; turning PR diffs, commits, tests, and architecture context into a local .pr-review/ HTML page for reviewers; or helping reviewers understand complex code changes without dumping the full diff.

Its SKILL.md is about 1.4k 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 Development, covering Pull requests and HTML artifacts. It works with Git. The repository describes itself as: Mastra is the modern TypeScript framework for AI-powered applications and agents.

When your agent uses it

  • Creating an approachable
  • Self-contained HTML review aid for a pull request
  • Explaining what changed
  • How it fits into the broader system

Example prompts

  • “/pr-explainer”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Understand the PR before writing HTML
  2. Find the explanation path
  3. Write for approachability
  4. Create a local self-contained HTML file

What it can do on your machine

Read from SKILL.md and the folder at commit 79ea2ae. 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:

    • git

    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.

Context cost

PR Explainer loads about 1.4k tokens when it runs. Until then it costs about 97 tokens; SKILL.md has 652 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~97
When it runs · the whole SKILL.md, loaded when a task matches
~1.4k

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 652 words (~1,407 tokens).

“Create a local, self-contained HTML page that teaches a reviewer the PR story: what changed, why it matters, how it works, how it fits into the system, and how it was verified.”

— opening of SKILL.md by mastra-ai, Custom licence
name
pr-explainer

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/pr-explainer of mastra-ai/mastra.

Open the folder on GitHubat commit 79ea2ae

Compare with similar skills

PR Explainer 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.

PR Explainer compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
PR Explainer this skillmastra-ai/mastra29k—~1.4kAutomated safety check: PassCustom licence
Visual Reviewai-dynamo/dynamo8.2k—~4.5kAutomated safety check: PassApache-2.0
Finishing a Development Branchobra/superpowers296k5 repos~1.9kAutomated safety check: PassMIT
Understand Diff AnalysisEgonex-AI/Understand-Anything86k1 repos~1.4kAutomated safety check: PassMIT
Contributor-First PR MergeHKUDS/OpenHarness16k1 repos~847Automated safety check: PassMIT
Open Code Review CLIalibaba/open-code-review44k—~3.1kAutomated safety check: PassApache-2.0

Similar skills

  • Visual Review

    ai-dynamo/dynamo

    Create self-contained interactive HTML code-review dashboards from GitHub or GitLab pull requests, checked-out branch diffs, or supplied unified diffs, with correctness and safe-to-merge scores…

    8.2k GitHub stars~4.5k tokensUpdated today
    DevelopmentAuto-check passed

  • Finishing a Development Branch

    obra/superpowers

    Walks the last step of a branch: confirm tests pass, detect the git environment, ask how to integrate, carry out your choice and clean up the worktree.

    296k GitHub starsUsed in 5 repos~1.9k tokens
    DevelopmentAuto-check passed

  • Understand Diff Analysis

    Egonex-AI/Understand-Anything

    Reads your git changes or a pull request against a prebuilt knowledge graph of the project to explain what changed, which components are affected and what is risky.

    86k GitHub starsUsed in 1 repo~1.4k tokens
    DevelopmentAuto-check passed

  • Contributor-First PR Merge

    HKUDS/OpenHarness

    Merges external GitHub pull requests while keeping the original author credited, and fixes conflicts after the merge instead of rewriting the contribution.

    16k GitHub starsUsed in 1 repo~847 tokens
    DevelopmentAuto-check passed

  • Open Code Review CLI

    alibaba/open-code-review

    Runs the ocr command-line tool to review Git changes, a commit or a branch comparison with an AI model, returning line-level comments and optionally applying fixes.

    44k GitHub stars~3.1k tokensUpdated 3 days ago
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  • Create Pull Request

    cline/cline

    Opens a GitHub pull request from your current branch with the gh CLI, after reviewing the commits and diff and gathering the details the PR needs.

    70k GitHub starsUsed in 1 repo~1.6k tokens
    DevelopmentAuto-check passed

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  • Coding Agent

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Works with

Categories

Questions about PR Explainer

What does PR Explainer do?

A skill your agent uses when creating an approachable, self-contained HTML review aid for a pull request; explaining what changed, why it matters, how it works, and how it fits into the broader…. PR Explainer is an agent skill from mastra-ai/mastra.pr-review/ HTML page for reviewers; or helping reviewers understand complex code changes without dumping the full diff.

When should I use PR Explainer?

PR Explainer fits situations like: creating an approachable; self-contained HTML review aid for a pull request; explaining what changed; how it fits into the broader system.

How do I install PR Explainer in Claude Code?

Run `npx skills add mastra-ai/mastra --skill pr-explainer -a claude-code`. Or copy the skill folder (.claude/skills/pr-explainer in mastra-ai/mastra) into .claude/skills/pr-explainer in your project. Claude Code loads it when a task matches its description.

How do I install PR Explainer in Codex?

Run `npx skills add mastra-ai/mastra --skill pr-explainer -a codex`. Or copy the skill folder (.claude/skills/pr-explainer in mastra-ai/mastra) into .agents/skills/pr-explainer in your project. Codex loads it when a task matches its description.

Can I use PR Explainer 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 mastra-ai/mastra --skill pr-explainer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/pr-explainer, .gemini/skills/pr-explainer, .github/skills/pr-explainer and .opencode/skills/pr-explainer in your project.

What does PR Explainer need to run?

Going by SKILL.md and its folder, PR Explainer needs the command-line tools its instructions call (git).

Does PR Explainer 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 PR Explainer 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 PR Explainer use?

PR Explainer 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 PR Explainer use?

About 1.4k tokens (SKILL.md is roughly 5.6k 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 PR Explainer?

Skills that share tags, products or a category with PR Explainer: Visual Review (ai-dynamo/dynamo, 8.2k stars), Finishing a Development Branch (obra/superpowers, 296k stars), Understand Diff Analysis (Egonex-AI/Understand-Anything, 86k stars) and Contributor-First PR Merge (HKUDS/OpenHarness, 16k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains PR Explainer?

mastra-ai (a GitHub organization) maintains it in mastra-ai/mastra, which has 28,628 GitHub stars. The repository holds 44 skills in this directory. The repository was last updated on October 8, 2026.

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