Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/ncssm-robotics/ftc-claudenpx agentmods add skills/ncssm-robotics/ftc-claude/skill-builderWrote 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.
[](https://agentmods.dev/skills/ncssm-robotics/ftc-claude/skill-builder)<a href="https://agentmods.dev/skills/ncssm-robotics/ftc-claude/skill-builder"><img src="https://agentmods.dev/badge/skills/ncssm-robotics/ftc-claude/skill-builder/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.
<a href="https://agentmods.dev/skills/ncssm-robotics/ftc-claude/skill-builder"><img src="https://agentmods.dev/badge/skills/ncssm-robotics/ftc-claude/skill-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00052 | $0.03560 |
| Opus 5.5 | $0.00021 | $0.01424 |
| Sonnet 5.5 | $0.00010 | $0.00712 |
| Haiku 4.5 | $0.00005 | $0.00356 |
Grade A, and why
skill-builder scanned grade A 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.
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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
data = requests.get(url).json() How it starts
The opening of the file, as written. The whole thing — 494 lines — stays where its author put it; the contents beside it link to each section on GitHub.
FTC Skill Builder
This skill teaches you how to create high-quality skills for the FTC Claude Skills Marketplace. Skills are knowledge packs that help AI coding agents assist FTC teams with specific hardware, libraries, frameworks, or tools.
Quick Reference
| Element | Purpose | Required |
|---|---|---|
name |
Unique identifier (kebab-case) | Yes |
description |
WHAT it does + WHEN to use it | Yes |
license |
Usually MIT for FTC community | Recommended |
compatibility |
Which agents support it | Recommended |
metadata |
Author, version, category | Recommended |
SKILL.md |
Main instructions (<500 lines) | Yes |
| Reference files | Detailed docs (API_REFERENCE.md) | Optional |
scripts/ |
Utility scripts | Optional |
When to Create a Skill vs Other Options
| Need | Solution |
|---|---|
| Domain expertise (hardware, library) | Skill - auto-activates when relevant |
| Explicit user action | Command - /create-skill name |
| Project-wide instructions | CLAUDE.md - always loaded |
| One-off task | Just ask Claude directly |
FTC Skill Categories
| Category | Description | Examples |
|---|---|---|
hardware |
Physical components | Pinpoint, Limelight, REV Hub, Spark Mini |
library |
Software libraries | Pedro Pathing, RoadRunner, FTCLib |
framework |
Code frameworks | NextFTC, command-based patterns |
tools |
Development tools | Panels, MeepMeep, EasyOpenCV |
game |
Season-specific | DECODE 2025-2026, INTO THE DEEP |
Available Commands
| Command | Purpose |
|---|---|
/create-skill <name> [category] |
Create new plugin from template |
/validate-skill <name> |
Validate plugin structure before PR |
Note: Version bumps are automated during the release process. Contributors should add changes to the
## [Unreleased]section ofCHANGELOG.mdinstead. See RELEASES.md for details.
Skill Anatomy
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.
- 2mo ago First seen · 494 lines · 52 tokens per session scan A 17e6cf49a435
skill-builder is a skill published in the GitHub repository ncssm-robotics/ftc-claude (5 stars, last pushed 9mo ago), licensed MIT. It adds 52 tokens to every session and 3,560 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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