streamling-advanced-plugins SKILL.md skillA
streamling-advanced-plugins from goldsky-io/streamling is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add goldsky-io/streamling/streamling-advanced-plugins@git:20261023.eeb1f48Pins git:20261023.eeb1f48 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- goldsky-io/streamling
- Path
skills/streamling-advanced-plugins/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261023.eeb1f48, committed Oct 23, 2026
- First version recorded
- Jun 25, 2026
- Size
- 17,237 bytes
- Repository stars
- 107
- License
- a license file GitHub does not identify
Use when implementing a streamling preprocessor (rewriting pipeline topology YAML before it parses), a DataFusion scalar UDF usable in SQL, a side output (observing every source without joining the pipeline), a partitioned source/transform/sink (one instance per physical stream), registering many component kinds in one crate, or dropping below the registration macros to the low-level manual FFI plugin module. Assumes streamling-plugin-basics.
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
# streamling advanced plugin kinds — Agent Skill
Beyond sources, transforms, and sinks, a plugin crate can register three more component kinds — **preprocessors**, **UDFs**, and **side outputs** — and can mix all six in one `cdylib`. Sources, transforms, and sinks can also be **partitioned**, running one instance per physical stream. This skill also covers the **low-level manual FFI** escape hatch for when the registration macros don't fit.
**Prerequisite:** [`streamling-plugin-basics`](skill://streamling-plugin-basics).
## Preprocessors — rewrite topology YAML before parsing
A preprocessor transforms the **raw topology config string** (the pipeline YAML) before streamling parses it. Use it to inject default options, expand shorthand dataset names into concrete source configs, or enforce per-source conventions — without touching streamling's core config parser.
```rust
use async_trait::async_trait;
use std::collections::HashMap;
use streamling_plugin::api::PluginError;
use streamling_plugin::{PluginInitializationError, PreprocessorPlugin};
pub struct DefaultsPreprocessor {
default_region: String,
}
impl DefaultsPreprocessor {
…Read the whole file at its exact version.
How to install
mdr add goldsky-io/streamling/streamling-advanced-plugins@sha256:4bd6f93bfd014004The line at the top of this page pins the label git:20261023.eeb1f48, 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_szpoou74vvwujuqw)
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Versions
The registry has recorded 2 versions of this file, between Jun 25, 2026 and Oct 23, 2026, about one every 119 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261023.eeb1f48 latest | 2026-10-23 | eeb1f48 | 17,237 B | A | view · diff |
| git:20260625.ecf56ac | 2026-06-25 | ecf56ac | 10,240 B | A | view |
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 (17237 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
goldsky-io/streamling · 107 stars · license a license file GitHub does not identify · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_szpoou74vvwujuqw GET https://markdownregistry.com/api/v1/resolve?ref=goldsky-io/streamling/streamling-advanced-plugins GET https://markdownregistry.com/api/v1/blob/4bd6f93bfd0140040f15bdfda4988e83af1cbf5817f2f8fc56c2799597c8101b
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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.