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blockbench-mcp-plugin: Skill for Claude Code

.agents/skills/typescript-expert/SKILL.md

typescript-expert is a skill for Claude Code, Codex from jasonjgardner/blockbench-mcp-plugin. It costs 76 tokens per session (3,584 once invoked), scanned C, original, GPL-3.0.

A set of guidance for TypeScript and JavaScript, languages commonly used to build web applications. It covers type systems, performance, shared-code repositories, migrations, and modern tools.

In plain words
What is it for?
Use it to solve TypeScript or JavaScript problems, improve build speed, plan migrations, manage a monorepo, or review software structure. A monorepo is one repository containing multiple related projects.
Why use it?
It helps when a task involves complex types, slow builds, difficult bugs, or decisions about changing an existing codebase.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

This is jasonjgardner/blockbench-mcp-plugin's own configuration. It tells Claude Code and Codex how to work on blockbench-mcp-plugin itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything blockbench-mcp-plugin configures →

not rated 606repo +13 12d ago C scan 76 tokens GPL-3.0
View source ↗ jasonjgardner/blockbench-mcp-plugin jasonjgardner.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to jasonjgardner/blockbench-mcp-plugin. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/jasonjgardner/blockbench-mcp-plugin/main/.agents/skills/typescript-expert/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/jasonjgardner/blockbench-mcp-plugin

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for typescript-expert

README.md
[![agentmods](https://agentmods.dev/badge/skills/jasonjgardner/blockbench-mcp-plugin/typescript-expert/github.svg)](https://agentmods.dev/skills/jasonjgardner/blockbench-mcp-plugin/typescript-expert)
Your own site
<a href="https://agentmods.dev/skills/jasonjgardner/blockbench-mcp-plugin/typescript-expert"><img src="https://agentmods.dev/badge/skills/jasonjgardner/blockbench-mcp-plugin/typescript-expert/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for typescript-expert

Your own site · 80×15
<a href="https://agentmods.dev/skills/jasonjgardner/blockbench-mcp-plugin/typescript-expert"><img src="https://agentmods.dev/badge/skills/jasonjgardner/blockbench-mcp-plugin/typescript-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 76 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,584 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00076 $0.03584
Opus 5.5 $0.00030 $0.01434
Sonnet 5.5 $0.00015 $0.00717
Haiku 4.5 $0.00008 $0.00358

Measured 2mo ago against content hash 88b62c21b51e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

typescript-expert scanned grade C with 1 finding 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 2mo ago.

The scan reads SKILL.md. This mod also ships 2 executable files (references/utility-types.ts, scripts/ts_diagnostic.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

4. Try clearing cache: `rm -rf node_modules/.cache .tsbuildinfo`
.agents/skills/typescript-expert/SKILL.md · 430 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

4 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.

Changes

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.

  1. 2mo ago First seen · 430 lines · 76 tokens per session scan C 88b62c21b51e

Subscribe to this mod's changes

typescript-expert is a skill published in the GitHub repository jasonjgardner/blockbench-mcp-plugin (606 stars, last pushed 12d ago), licensed GPL-3.0. It adds 76 tokens to every session and 3,584 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

LanguagesTypeScriptblockbenchblockbench-pluginframeworkmcp-server
Related

typescript-expert compared with skills from other repositories

typescript-expert next to 6 skills from other repositories
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typescript-expertjasonjgardner/blockbench-mcp-pluginSkill60612d agoGPL-3.0C76Claude Code, Codex
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