Verified author

Garry Tan

CEO and Builder at Y Combinator | San Francisco

Builds opinionated AI workflows and fast product loops for software teams shipping with agents.

agent workflowsproduct engineeringstartup execution

Author focus3 skills

github.com/garrytan

Published skills

What they maintain on Skill Market.

Code ReviewLow riskVerified

GStack Review

A pre-landing review skill from the gstack toolkit that inspects diffs for trust boundary mistakes, unsafe SQL, conditional side effects, and missing tests.

4.9(312)80.1K installsUpdated Apr 22, 2026

Best forPre-merge PR review

Install command

codex /review

Works inCodexClaude Code

View source

Audit notes

Low operational risk for read-heavy review, but fix application can edit local files.

reviewdiffpr+2

Curator review pending - install with caution.

TestingMedium riskReview needed

GStack QA

A browser-first QA skill from gstack that explores user flows, captures evidence, and can fix verified bugs in iterative loops.

4.8(312)80.1K installsUpdated Apr 22, 2026

Best forOpen the app, test the flow, fix what breaks.

Install command

codex /qa

Works inCodexClaude Code

View source

Audit notesPartial

No curator security note has been written yet.

qabrowserregression+2

Curator review pending - install with caution.

DebuggingLow riskReview needed

GStack Investigate

A structured debugging skill from gstack that forces evidence gathering, hypothesis testing, and root-cause-first remediation.

4.8(312)80.1K installsUpdated Apr 22, 2026

Best forNo fixes until the root cause is real.

Install command

codex /investigate

Works inCodexClaude Code

View source

Audit notesPartial

No curator security note has been written yet.

debuggingroot-causeincidents+1