Agent skill

Label Core Bugs

by mastra-ai in mastra-ai/mastra

Review open mastra-ai/mastra GitHub issues, identify direct @mastra/core bugs, and apply the @mastra/core label.

Custom licenceAuto-check passedDevelopment

Install Label Core Bugs

skills CLI
$ npx skills add mastra-ai/mastra --skill label-core-bugs -a claude-code

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

GitHub CLI
$ gh skill install mastra-ai/mastra label-core-bugs --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/.agents/skills/label-core-bugs .claude/skills/label-core-bugs && 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
label-core-bugs
GitHub stars
29k
Token cost
~1k tokens
SKILL.md length
457 words
Files
1
Skills in repo
44
Repo updated
First seen
Licence
Custom licence

At a glance

Review open mastra-ai/mastra GitHub issues, identify direct @mastra/core bugs, and apply the @mastra/core label.

  • Works in 2 steps: It reports broken existing behavior—not… → The primary fix belongs in packages/core…
  • Auditing issues for core ownership
  • SKILL.md covers Inputs, Classification, Workflow and Output
  • Calls gh

What it does

Label Core Bugs is an agent skill from mastra-ai/mastra. Review open mastra-ai/mastra GitHub issues, identify direct @mastra/core bugs, and apply the @mastra/core label. Use when auditing issues for core ownership, labeling direct core bugs, or periodically reconciling the @mastra/core issue label.

Its SKILL.md is about 1k 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. It works with Mastra and GitHub. The repository describes itself as: Mastra is the modern TypeScript framework for AI-powered applications and agents.

When your agent uses it

  • Auditing issues for core ownership
  • Labeling direct core bugs
  • Periodically reconciling the @mastra/core issue label

Example prompts

  • “/label-core-bugs”

Workflow steps

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

  1. It reports broken existing behavior—not a feature, support request, docs gap, or maintenance task.
  2. The primary fix belongs in packages/core or the published @mastra/core package.

What it can do on your machine

Read from SKILL.md and the folder at commit fecbeda. 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:

    • gh

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use gh, 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

Label Core Bugs loads about 1k tokens when it runs. Until then it costs about 65 tokens; SKILL.md has 457 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~65
When it runs · the whole SKILL.md, loaded when a task matches
~1k

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 457 words (~1,013 tokens).

“Review open mastra-ai/mastra issues and add @mastra/core only to direct core bugs. Do not comment, close, assign, remove labels, modify code, or commit.”

— opening of SKILL.md by mastra-ai, Custom licence
name
label-core-bugs

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/label-core-bugs of mastra-ai/mastra.

Open the folder on GitHubat commit fecbeda

Compare with similar skills

Label Core Bugs 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.

Label Core Bugs compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Label Core Bugs this skillmastra-ai/mastra29k—~1kAutomated safety check: PassCustom licence
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Greplooponyx-dot-app/onyx32k4 repos~3.3kAutomated safety check: PassMIT
Check PRonyx-dot-app/onyx32k2 repos~2.3kAutomated safety check: PassMIT
Setup Matt Pocock Skillsbestofjs/bestofjs3.1k20 repos~1.7kAutomated safety check: PassMIT
Contributor-First PR MergeHKUDS/OpenHarness16k1 repos~847Automated safety check: PassMIT

Similar skills

  • PR Babysitter

    openinterpreter/openinterpreter

    Watches an open GitHub pull request until it merges, handling review comments, diagnosing CI failures and retrying flaky checks along the way.

    69k GitHub starsUsed in 3 repos~4.2k tokens
    DevelopmentAuto-check passed
  • Greploop

    onyx-dot-app/onyx

    Iteratively improves a PR (GitHub), MR (GitLab), or shelved changelist (Perforce) until Greptile gives it a 5/5 confidence score with zero unresolved comments.

    32k GitHub starsUsed in 4 repos~3.3k tokens
    DevelopmentAuto-check passed
  • Check PR

    onyx-dot-app/onyx

    Checks a GitHub, GitLab, or Perforce (p4) pull request (or merge request, or shelved changelist) for unresolved review comments, failing status checks, and incomplete PR descriptions.

    32k GitHub starsUsed in 2 repos~2.3k tokens
    DevelopmentAuto-check passed
  • Setup Matt Pocock Skills

    bestofjs/bestofjs

    Configure this repo for the engineering skills — set up its issue tracker, triage label vocabulary, and domain doc layout.

    3.1k GitHub starsUsed in 20 repos~1.7k tokens
    DevelopmentAuto-check passed
  • 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
  • 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

More from mastra-ai/mastra

All 44 skills in this repo
  • Docs Audit

    mastra-ai/mastra

    Autonomous, report-only documentation review for Mastra docs.

    29k GitHub stars~3k tokensUpdated today
    Auto-check passed
  • Builder Smoke Test

    mastra-ai/mastra

    Smoke test the Agent Builder feature branch end-to-end against a hermetic project scaffolded by the skill (linked to the current worktree).

    29k GitHub stars~11k tokensUpdated today
    Auto-check: notes
  • Mastra Smoke Test

    mastra-ai/mastra

    Smoke test Mastra projects locally or deploy to staging/production.

    29k GitHub stars~4k tokensUpdated today
    Auto-check: notes
  • React Best Practices

    mastra-ai/mastra

    React performance optimization guidelines from Mastra Engineering.

    29k GitHub stars~1.9k tokensUpdated today
    Auto-check passed
  • Agent Prompt Quality Bar

    mastra-ai/mastra

    Universal quality bar and final audit rubric for any agent system prompt.

    29k GitHub stars~2k tokensUpdated today
    Auto-check passed
  • Coding Agent

    mastra-ai/mastra

    Authoring playbook for building agents that write, edit, review, or refactor code.

    29k GitHub stars~2.3k tokensUpdated today
    Auto-check passed

Works with

Categories

Questions about Label Core Bugs

What does Label Core Bugs do?

Review open mastra-ai/mastra GitHub issues, identify direct @mastra/core bugs, and apply the @mastra/core label. Label Core Bugs is an agent skill from mastra-ai/mastra. Review open mastra-ai/mastra GitHub issues, identify direct @mastra/core bugs, and apply the @mastra/core label.

When should I use Label Core Bugs?

Label Core Bugs fits situations like: auditing issues for core ownership; labeling direct core bugs; periodically reconciling the @mastra/core issue label.

How do I install Label Core Bugs in Claude Code?

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

How do I install Label Core Bugs in Codex?

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

Can I use Label Core Bugs 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 label-core-bugs -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/label-core-bugs, .gemini/skills/label-core-bugs, .github/skills/label-core-bugs and .opencode/skills/label-core-bugs in your project.

What does Label Core Bugs need to run?

Going by SKILL.md and its folder, Label Core Bugs needs the command-line tools its instructions call (gh).

Does Label Core Bugs access the network?

SKILL.md contains no URLs. Its commands use gh, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Label Core Bugs 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 Label Core Bugs use?

Label Core Bugs 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 Label Core Bugs use?

About 1k tokens (SKILL.md is roughly 4.1k 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 Label Core Bugs?

Skills that share tags, products or a category with Label Core Bugs: PR Babysitter (openinterpreter/openinterpreter, 69k stars), Greploop (onyx-dot-app/onyx, 32k stars), Check PR (onyx-dot-app/onyx, 32k stars) and Setup Matt Pocock Skills (bestofjs/bestofjs, 3.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Label Core Bugs?

mastra-ai (a GitHub organization) maintains it in mastra-ai/mastra, which has 28,674 GitHub stars. The repository holds 44 skills in this directory. The repository was last updated on October 10, 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.