A reference guide for building or changing extensions to the Spark domain-specific language, a tool for defining structured application data and behavior in Elixir.

Use it when developing a Spark DSL extension, setting up its formatter, generating documentation cheat sheets, or checking Spark-specific documentation links.

It helps you find the right definitions, sections, transformations, and checks without piecing together the extension rules yourself.

How jrjsmrtn/tlx configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to jrjsmrtn/tlx. 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/jrjsmrtn/tlx/main/.claude/skills/spark/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/jrjsmrtn/tlx

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/skills/jrjsmrtn/tlx/spark.svg)](https://agentmods.dev/skills/jrjsmrtn/tlx/spark)

Your own site

<a href="https://agentmods.dev/skills/jrjsmrtn/tlx/spark"><img src="https://agentmods.dev/badge/skills/jrjsmrtn/tlx/spark.svg" alt="Measured on agentmods" height="20"></a>

Per session 27 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 251 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 original 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	$0.00027	$0.00251
Opus 5	$0.00014	$0.00125
Sonnet 5	$0.00005	$0.00050
Haiku 4.5	$0.00003	$0.00025

Measured 7d ago against content hash c3945c714f58, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

spark 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 7d 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.

.claude/skills/spark/SKILL.md · 28 lines

What it actually says

Additional References

spark

Searching Documentation

mix usage_rules.search_docs "search term" -p spark

Available Mix Tasks

mix spark.cheat_sheets - Creates cheat sheets for each Extension provided. Useful for CI with --check flag.
mix spark.cheat_sheets.docs
mix spark.cheat_sheets_in_search - Includes generated cheat sheets in the search bar
mix spark.formatter - Manages a variable called spark_locals_without_parens in the .formatter.exs from a list of DSL extensions.
mix spark.install - Installs spark by adding the Spark.Formatter plugin, and providing a basic configuration for it in config.exs.
mix spark.replace_doc_links - Replaces any spark dsl specific doc links with text appropriate for hex docs.

Files

What ships with it

1 file 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.

references/spark.md 10 KB

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.

7d ago First seen · 28 lines · 27 tokens per session scan A c3945c714f58

Subscribe to this mod's changes

spark is a skill published in the GitHub repository jrjsmrtn/tlx (10 stars, last pushed 1mo ago), licensed MIT. It adds 27 tokens to every session and 251 once invoked, about $0.0001 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 2026-08-31.

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tlx: Skill for Claude Code