derivation-python SKILL.md skillA
derivation-python from estuary/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add estuary/agent-skills/derivation-python@git:20260707.6b608bfPins git:20260707.6b608bf in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- estuary/agent-skills
- Path
skills/derivation-python/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260707.6b608bf, committed Jul 7, 2026
- Size
- 18,463 bytes
- Repository stars
- 7
- License
- Apache-2.0
Write Estuary derivations in Python — async-generator transforms, Pydantic-typed source/output, optional persistent state, and dependency installation via uv. Use for ML/embeddings, async API calls, or any transform where SQL and TypeScript are awkward. Derivations add complexity and cost (and Python derivations require a private/BYOC data plane) — confirm the user wants a Python derivation before reaching for this. Use when user says "python derivation", "write a derivation in python…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# derivation-python Estuary derivation implemented as a Python class with async-generator transforms. Runtime is `uv`, types come from Pydantic models generated at `flowctl generate` time, and the whole thing is validated in pyright strict mode at publish. **Prereq:** read `derivation-basics` first for concepts, project layout, stateless-vs-stateful, and the universal workflow. **Hard constraint:** Python derivations run on **private or BYOC data planes only** — never on shared public planes. Reach out to your Estuary account manager if you're interested in a private or BYOC data plane. **Docs:** [concept page](https://docs.estuary.dev/concepts/derivations/#python) · [walkthrough](https://docs.estuary.dev/guides/transform_data_using_python/) · [upstream examples](https://github.com/estuary/flow/tree/master/examples/derive-patterns) (`stateful.flow.py`, `pipeline.flow.py`). ## When to reach for Python (vs SQL / TypeScript) - **ML / embeddings / tokenisers** — `model2vec`, `fastembed`, `transformers`, `tiktoken` - **Async I/O** — per-document `await httpx.get(...)`, external APIs with bounded concurrency - **Heavy Python ecosystem deps** — `pandas`, `pyarrow`, custom parsers …
Read the whole file at its exact version.
How to install
mdr add estuary/agent-skills/derivation-python@sha256:c179256d9d3fb0feThe line at the top of this page pins the label git:20260707.6b608bf, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_w2v2nx7fditbd7qe)
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Versions
The registry has recorded 1 version of this file, committed on Jul 7, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (18463 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
estuary/agent-skills · 7 stars · license Apache-2.0 · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_w2v2nx7fditbd7qe GET https://markdownregistry.com/api/v1/resolve?ref=estuary/agent-skills/derivation-python GET https://markdownregistry.com/api/v1/blob/c179256d9d3fb0feed3b5dc44382bc260f3d79ea19bdb36aa44c242ffcc3f456
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.