What is skillbuilder?

A command for building a coding-agent skill around a technology stack, software library, or command-line tool. The description does not explain the generated skill’s exact contents.

Creating a Claude Code skill for a tech stack, library, or command-line tool.

It helps package recurring instructions for a specific technology instead of recreating them each time.

skillbuilder — Command for Claude Code by cesdperez/llmfiles

Install

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.

Clone the repo

git clone --depth 1 https://github.com/cesdperez/llmfiles

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/cesdperez/llmfiles/skillbuilder/github.svg)](https://agentmods.dev/commands/cesdperez/llmfiles/skillbuilder)

Your own site

<a href="https://agentmods.dev/commands/cesdperez/llmfiles/skillbuilder"><img src="https://agentmods.dev/badge/commands/cesdperez/llmfiles/skillbuilder/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.

Your own site · 80×15

<a href="https://agentmods.dev/commands/cesdperez/llmfiles/skillbuilder"><img src="https://agentmods.dev/badge/commands/cesdperez/llmfiles/skillbuilder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 2,327 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. 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.

Model	Per session	Once invoked
Fable 5.1	$0.00015	$0.02327
Opus 5.5	$0.00006	$0.00931
Sonnet 5.5	$0.00003	$0.00465
Haiku 4.5	$0.00002	$0.00233

Measured 5d ago against content hash 7486c9c04e0f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skillbuilder 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 5d 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.

commands/skillbuilder.md · 150 lines

The source is not reproduced here

No licence file

Read it on GitHub

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.

5d ago Changed · -3 lines 7486c9c04e0f
12d ago Changed · -3 lines 0d9bae1d9299
28d ago Changed · +8 lines 023ebd014af0
1mo ago Changed 4526efdb6f34
2mo ago First seen · 148 lines · 15 tokens per session scan A 042e8acc419e

Subscribe to this mod's changes

skillbuilder is a command published in the GitHub repository cesdperez/llmfiles (2 stars, last pushed 2d ago), with no licence file. It adds 15 tokens to every session and 2,327 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-31.

Building agents

skillbuilder next to 6 commands from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
skillbuildercesdperez/llmfiles	Command	2	2d ago	none	A	15	Claude Code
checklistgithub/spec-kit	Command	148k	yesterday	MIT	A	13	Claude Code
clarifygithub/spec-kit	Command	148k	yesterday	MIT	A	27	Claude Code
specifygithub/spec-kit	Command	148k	yesterday	MIT	A	13	Claude Code
analyzegithub/spec-kit	Command	148k	yesterday	MIT	A	26	Claude Code
convergegithub/spec-kit	Command	148k	yesterday	MIT	A	35	Claude Code
implementgithub/spec-kit	Command	148k	yesterday	MIT	A	14	Claude Code