What is estuary-derivations?

A set of skills for transforming Estuary collections using SQL, TypeScript, or Python. Transformations can filter records, combine collections, calculate totals, reshape arrays, keep state, and group data into time windows.

Create filters, aggregations, joins, flattened arrays, stateful logic, time-windowed results, and Python-based derivations.

It provides guidance for turning collected data into derived data without building each transformation pattern from scratch.

estuary-derivations — Plugin for Claude Code by estuary/agent-skills

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/estuary/agent-skills

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/plugins/estuary/agent-skills/estuary-derivations/github.svg)](https://agentmods.dev/plugins/estuary/agent-skills/estuary-derivations)

Your own site

<a href="https://agentmods.dev/plugins/estuary/agent-skills/estuary-derivations"><img src="https://agentmods.dev/badge/plugins/estuary/agent-skills/estuary-derivations/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/plugins/estuary/agent-skills/estuary-derivations"><img src="https://agentmods.dev/badge/plugins/estuary/agent-skills/estuary-derivations.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured The manifest loads nothing itself; its 8 skills cost 995 tokens a session between them.

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.

Security

Grade A, and why

estuary-derivations 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 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.

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-plugin/marketplace.json#estuary-derivations · 16 lines

What it actually says

{
  "name": "estuary-derivations",
  "description": "Derivation skills for transforming Estuary collections in SQL, TypeScript, or Python: filters, aggregations, joins, array flattening, stateful logic, and time windowing",
  "source": "./",
  "strict": false,
  "skills": [
    "./skills/derivation-basics",
    "./skills/derivation-filter-transform",
    "./skills/derivation-aggregate-metrics",
    "./skills/derivation-join-collections",
    "./skills/derivation-flatten-array",
    "./skills/derivation-stateful-logic",
    "./skills/derivation-windowing",
    "./skills/derivation-python"
  ]
}

Contents

What it installs

The manifest is a name and a version. 8 skills travel with it, and installing the plugin installs all of them — 995 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Files

What ships with it

1 file beside marketplace.json#estuary-derivations 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.

marketplace.json 3.3 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.

2mo ago First seen · 16 lines scan A 5c87d69ad8c2

Subscribe to this mod's changes

estuary-derivations is a plugin published in the GitHub repository estuary/agent-skills (7 stars, last pushed 4d ago), licensed Apache-2.0. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-09-03.

Claude Code Data and AI agent-skills ai-agents cdc change-data-capture codex

estuary-derivations next to 6 plugins from other repositories
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estuary-derivationsestuary/agent-skills	Plugin	7	4d ago	Apache-2.0	A	—	Claude Code
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