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lfx-self-serve: Skill for Claude Code

.claude/skills/snowflake/SKILL.md

snowflake is a skill for Claude Code from linuxfoundation/lfx-self-serve. It costs 66 tokens per session (662 once invoked), scanned A, original, MIT.

A guide for writing Snowflake queries, which are SQL requests sent to Snowflake, a cloud data platform. It covers analytics endpoints in the Self Serve backend and the shared connection pool used to run them.

In plain words
What is it for?
Use it when adding or changing analytics endpoints, SQL files, Snowflake service code, or query parameters. It also helps investigate missing rows, incorrect counts, and connection failures.
Why use it?
It focuses on matching each SQL placeholder with the correct input value, a common cause of wrong results or failed queries. It also keeps new code on the project's shared database connection.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

This is linuxfoundation/lfx-self-serve's own configuration. It tells Claude Code how to work on lfx-self-serve 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 lfx-self-serve configures →

not rated 16repo +2 changed 1mo ago A scan 66 tokens original MIT
View source ↗ linuxfoundation/lfx-self-serve linuxfoundation.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to linuxfoundation/lfx-self-serve. 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/linuxfoundation/lfx-self-serve/main/.claude/skills/snowflake/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/linuxfoundation/lfx-self-serve

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.

agentmods badge for snowflake

README.md
[![agentmods](https://agentmods.dev/badge/skills/linuxfoundation/lfx-self-serve/snowflake/github.svg)](https://agentmods.dev/skills/linuxfoundation/lfx-self-serve/snowflake)
Your own site
<a href="https://agentmods.dev/skills/linuxfoundation/lfx-self-serve/snowflake"><img src="https://agentmods.dev/badge/skills/linuxfoundation/lfx-self-serve/snowflake/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 snowflake

Your own site · 80×15
<a href="https://agentmods.dev/skills/linuxfoundation/lfx-self-serve/snowflake"><img src="https://agentmods.dev/badge/skills/linuxfoundation/lfx-self-serve/snowflake.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 66 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 662 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00066 $0.00662
Opus 5.5 $0.00026 $0.00265
Sonnet 5.5 $0.00013 $0.00132
Haiku 4.5 $0.00007 $0.00066

Measured 1mo ago against content hash f30247cd7fd2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

snowflake 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 1mo 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/snowflake/SKILL.md · 36 lines

How it starts

The opening of the file, as written. The whole thing — 36 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Self Serve Snowflake Skill

You are writing or modifying SQL that runs against Snowflake through Self Serve's singleton connection pool. SQL bind alignment is the most common Critical bug in this area.

When to use

  • Adding a new analytics endpoint (Snowflake-backed) under apps/lfx-one/src/server/.
  • Modifying a query that touches snowflake.service.ts directly.
  • Adding a new SQL file or modifying an existing one that uses ? placeholders.
  • Investigating dropped rows, wrong counts, or "snowflake disconnected" errors.

Workflow

  1. Re-read docs/architecture/backend/snowflake-integration.md (the reference linked below). It documents the singleton pool, query deduplication, warehouse selection, and result-set handling.
  2. Bind discipline — every ? placeholder in the SQL must have a corresponding value in the binds array, in the correct order. Bind mismatch is always Critical (the reviewer will flag it). Walk left-to-right through the SQL and count ?; the binds array length must equal that count.
  3. Do not bypass the singleton pool. snowflake.service.ts is a protected file. New consumers go through it; new query methods extend it under code-owner review.
  4. Parameterize, never interpolate. No string concatenation of user input into SQL. LIMIT/OFFSET are the one exception (Snowflake cannot bind them): interpolate only values bounded by parseOffsetPagination (controller) or clampInteger (service), capped at MAX_SNOWFLAKE_PAGINATION_PAGE.
  5. For project- or persona-scoped queries, filter by the right Snowflake column up front; do not over-fetch and filter in JS.
  6. Log via the logger service (not serverLogger). Use logger.debug for query tracing, logger.warning for empty results when a result was expected.
  7. For known-false-positive patterns (e.g., empty result sets that are valid), check docs/reviews/knowledge-base/data-and-snowflake.md.

Reference

Read the full file on GitHub · 36 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. 1mo ago Changed f30247cd7fd2
  2. 2mo ago First seen · 36 lines · 66 tokens per session scan A c7a1111dae51

Subscribe to this mod's changes

snowflake is a skill published in the GitHub repository linuxfoundation/lfx-self-serve (16 stars, last pushed today), licensed MIT. It adds 66 tokens to every session and 662 once invoked, about $0.0003 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 2026-08-30.

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