source-command-format-sync

A procedure for keeping Rust and Node versions of the LibrAIum data format in sync. Rust and Node are programming technologies, and a fixture is a saved test example used to check matching behavior.

In plain words
What is it for?
Mirror changes to schemas, parsing, serialization, slug creation, URL handling, duplicate detection, and category data, then prove compatibility with a fixture.
Why use it?
It prevents the two implementations from parsing, validating, or writing the same files differently after a format change.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/nel-neru/libraium/source-command-format-sync
Any agent
npx skills add nel-neru/LibrAIum --skill source-command-format-sync
Clone the repo
git clone --depth 1 https://github.com/nel-neru/LibrAIum

Made for: Claude Code, Codex.

Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 828 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00025 $0.00828
Opus 5 $0.00013 $0.00414
Sonnet 5 $0.00005 $0.00166
Haiku 4.5 $0.00003 $0.00083

Measured yesterday against content hash 8ee0588b3023, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

source-command-format-sync 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 yesterday.

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.

.agents/skills/source-command-format-sync/SKILL.md · 50 lines

How it starts

The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.

source-command-format-sync

Use this skill when the user asks to run the migrated source command format-sync.

Command Template

The LibrAIum data format is deliberately dual-implemented: the Rust core (desktop app) and the Node MCP server each parse, validate, and serialize the same files. After ANY change to the entry format, slugify, URL normalization, duplicate detection, or category master shape, run this synchronization procedure.

1. Identify what changed and mirror it

Walk this mapping and make the counterpart change on the other side:

Concern Rust Node
Frontmatter schema, field defaults (status: active, source: manual, stars: 0, optional-field omission) src-tauri/src/models.rs (EntryMeta) mcp-server/lib/store.js (parseEntry consumers, summarize defaults)
Frontmatter split/parse/serialize (BOM handling, --- fences, body trimming, trailing newline) src-tauri/src/frontmatter.rs mcp-server/lib/store.js (splitFrontmatter, parseEntry, serializeEntry)
slugify (allowed charset [a-z0-9-_.], /-, lowercase, trim -) src-tauri/src/store.rs (slugify) mcp-server/lib/store.js (slugify)
GitHub URL normalization (http/https/bare/git@ forms, .git, trailing /, /tree/...) src-tauri/src/store.rs (normalize_github_url) mcp-server/lib/store.js (normalizeGithubUrl)
Duplicate detection (case-insensitive full_name) and entry id (<category>/<slug>) src-tauri/src/store.rs (find_duplicate, list_entries) mcp-server/lib/store.js (findDuplicate, listEntries, saveNewEntry)

Both sides must accept, reject, and produce identical results. Where the change touches parsing, check the reject cases too (missing opening ---, unterminated frontmatter) — error behavior must match even if error text differs.

2. Add a fixture for the new shape

Add a fixture covering the new format shape to tests/fixtures/format/. Follow the naming pattern already used there (valid inputs that must round-trip, and invalid inputs both sides must reject). The conformance runner picks fixtures up automatically. Also extend the unit tests nearest the change (frontmatter::tests / store::tests in Rust) if the fixture alone can't express it.

Read the full file on GitHub · 50 lines

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. yesterday First seen · 50 lines · 25 tokens per session scan A 8ee0588b3023

Subscribe to this mod's changes

source-command-format-sync is a skill published in the GitHub repository nel-neru/LibrAIum (0 stars, last pushed 5d ago), licensed MIT. It adds 25 tokens to every session and 828 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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