estuary/agent-skills · skills/derivation-windowing/SKILL.md

derivation-windowing skillA

derivation-windowing is agent-read markdown (skill) from estuary/agent-skills: Create an Estuary derivation that maintains a sliding time window of events (e.g. "transfers in the last 24h", "failed logins in the last 5 minutes") using internal SQLite state and readDelay for time-based expiration. Derivations add complexity and cost — confirm the user wants a derivation before reaching for this. Use when user says "windowing derivation", "derivation for last-24h events", "rolling-window derivation", "sliding-window transformation", "fraud-detection derivation", "rate-limit .

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add estuary/agent-skills/derivation-windowing@git:20260707.6b608bf
Exact content
mdr add estuary/agent-skills/derivation-windowing@sha256:14313a59f64e31b5

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_b3r4mplo2pwfzyvl.svg)](https://markdownregistry.com/a/art_b3r4mplo2pwfzyvl)

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Versions

versioncommittedcommitsizeaudit
git:20260707.6b608bf latest2026-07-07 6b608bf 14,449 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (14449 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

estuary/agent-skills · 7 stars · license Apache-2.0 · pushed 2026-09-17 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_b3r4mplo2pwfzyvl
GET https://markdownregistry.com/api/v1/resolve?ref=estuary/agent-skills/derivation-windowing
GET https://markdownregistry.com/api/v1/blob/14313a59f64e31b50cb8f70d74b86e2ea586df0035e408938ace0c64e476aa93

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.