Write Hook

facebook/write-hook

Create a Mononoke server-side hook with 3-diff split (tests, wiring, implementation), unit tests, and integration tests

3k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

6956

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/facebook/sapling --skill write-hook

10 610 bytes besides the instruction

references/common-mistakes.md

references/configerator-setup.md

references/implementation-guide.md

references/performance-constraints.md

references/testing-patterns.md

1 sections, as written by the author

Create a server-side Mononoke hook based on the user's request.

When creating a new hook, read references/implementation-guide.md
When writing hook logic that touches manifests or derived data, read references/performance-constraints.md
When writing unit or integration tests, read references/testing-patterns.md
Before submitting, read references/common-mistakes.md
After implementation is complete, read references/configerator-setup.md for enabling the hook in production

Copy the folder

Take facebook/write-hook from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.