Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/gaia-react/gaia/typescriptnpx skills add gaia-react/gaia --skill typescriptgit clone --depth 1 https://github.com/gaia-react/gaiaWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00054 | $0.01124 |
| Opus 5 | $0.00027 | $0.00562 |
| Sonnet 5 | $0.00011 | $0.00225 |
| Haiku 4.5 | $0.00005 | $0.00112 |
Grade A, and why
typescript scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TypeScript
Patterns and conventions for all TypeScript code.
Types
import type {}for type-only imports:import type {FC} from 'react'
Naming, camelCase
All identifiers use camelCase: Zod fields, form name/id/htmlFor, props, state, params.
Exceptions (snake_case OK):
types/database.ts, mirrors DB column names- Dynamic template literal names where variable part is already lowercase
- Environment variable names (
SUPABASE_URL)
Map snake_case ↔ camelCase at API call boundaries, not in schemas or UI code.
Naming, Descriptive and Self-Documenting
Follow Apple's Swift API Design Guidelines: names should be clear at the point of use, reading like prose. Favor long, descriptive names over short or abbreviated ones. Code should be readable without consulting documentation.
- Functions and methods: imperative verb phrases:
calculateProgressPercentageFromCompletedSets,processUserOnboardingProfile - Parameters: role, not type:
totalSecondsnotn,emailAddressnots - Variables: what they hold:
restDurationInSeconds,submitButton,weightInputValue - No abbreviations: spell out unless universally known (
url,id,api):animationDurationInMillisecondsnotanimDur - No redundant words:
availableExercisesnotexerciseArray, but don't sacrifice clarity for brevity
Exception, React event handlers follow
handle{Action}{Element}from the react-code skill (e.g.handleClickSave,handleChangeInput), the{Element}is required, since a barehandleClickorhandleChangetripsreact-doctor/no-generic-handler-names. The descriptive naming guidelines above apply to utilities, hooks, callbacks, and non-event-handler functions.
Read references/naming-conventions.md for extended BAD/GOOD examples of each naming pattern.
Exported Functions, Explicit Return Types
All exported functions must have explicit return types.
Exceptions:
- Route loaders/actions (complex generics)
- React components typed with
FC<Props>(return type provided by generic)
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 83 lines · 54 tokens per session scan A ddb3e7f49a00
typescript is a skill published in the GitHub repository gaia-react/gaia (22 stars, last pushed 2d ago), licensed MIT. It adds 54 tokens to every session and 1,124 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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compiler-port
Port a compiler pass from TypeScript to Rust. Gathers context, plans the port, implements in a subagent with test-fix loop, then reviews.
effect
Work with Effect v4 / effect-smol TypeScript code in this repo.
migrate-oxfmt
Guide for migrating a project from Prettier or Biome to Oxfmt. Use when asked to migrate, convert, or switch a JavaScript/TypeScript project's formatter from Prettier or Biome to Oxfmt.
convert-internal-package-to-typescript
Convert a legacy internal Ghost workspace package from JavaScript or CommonJS to the repository's TypeScript and ESM golden path while preserving file history and runtime compatibility. Use when modernizing an existing or newly migrated private package, including staged lib-to-src moves, JS-to-TS renames, consumer…
typescript
Write clear, predictable TypeScript and Vue TypeScript code with strong typing, maintainability, and consistent documentation conventions.