estuary/agent-skills · skills/derivation-aggregate-metrics/SKILL.md

derivation-aggregate-metrics skillA

derivation-aggregate-metrics is agent-read markdown (skill) from estuary/agent-skills: Create an Estuary derivation that continuously aggregates metrics (daily totals, running counts, min/max, lifetime revenue) using reduction annotations. Use for real-time dashboards, continuous materialised views, and replacing batch ETL aggregations with streaming. Derivations add complexity and cost — confirm the user wants a derivation before reaching for this. Use when user says "aggregation derivation", "derivation to sum daily totals", "running-count derivation", "transformation for min/ma.

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-aggregate-metrics@git:20260707.6b608bf
Exact content
mdr add estuary/agent-skills/derivation-aggregate-metrics@sha256:4e1c48a93bf83406

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_trlti4gm3k57ttnd.svg)](https://markdownregistry.com/a/art_trlti4gm3k57ttnd)

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Versions

versioncommittedcommitsizeaudit
git:20260707.6b608bf latest2026-07-07 6b608bf 12,239 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 (12239 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_trlti4gm3k57ttnd
GET https://markdownregistry.com/api/v1/resolve?ref=estuary/agent-skills/derivation-aggregate-metrics
GET https://markdownregistry.com/api/v1/blob/4e1c48a93bf834069c67398b73b4b0e9b1bb5e2da83994122b0c986529d3ac5c

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