ml4t-canonical-schema skillA
ml4t-canonical-schema is agent-read markdown (skill) from ml4t/skills: Standardized data schema across all financial datasets. Use when defining or enforcing column names, types, and index conventions..
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.
What the file says
# Canonical Schema
When every dataset uses different column names - `date` vs `ts_event` vs `timestamp`, `asset` vs `ticker` vs `symbol` - every downstream notebook needs special-case handling.
## The Problem
Provider A delivers `date`, `ticker`, `close`; Provider B uses `ts_event`,
`symbol`, `price`; Provider C uses `timestamp`, `asset`, `adj_close`. Without a
canonical schema, every downstream notebook needs provider-specific renames.
## The Pattern
### WRONG
```python
import polars as pl
# Different column names per dataset - downstream code breaks constantly
etfs = pl.read_parquet("etfs.parquet") # has: date, ticker, close
futures = pl.read_parquet("futures.parquet") # has: ts_event, product, settle
crypto = pl.read_parquet("crypto.parquet") # has: timestamp, symbol, close
# Every notebook needs provider-specific column mapping
if "date" in df.columns:
df = df.rename({"date": "timestamp"})
elif "ts_event" in df.columns:
df = df.rename({"ts_event": "timestamp"})
# Repeat for every column, every dataset, every notebook
```
### CORRECT
```python
import polars as pl
# Canonical schema: enforced once at load time, trusted everywhere after
…Read the whole file at its exact version.
How to install
mdr add ml4t/skills/ml4t-canonical-schema@git:20260901.c415df0mdr add ml4t/skills/ml4t-canonical-schema@sha256:063cfc074ef5e711Pin 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.
[](https://markdownregistry.com/a/art_xwshxlq5jypuekph)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260901.c415df0 latest | 2026-09-01 | c415df0 | 4,627 B | A | view · diff |
| git:20260528.303089e | 2026-05-28 | 303089e | 4,643 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 (4627 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
ml4t/skills · 19 stars · license Apache-2.0 · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xwshxlq5jypuekph GET https://markdownregistry.com/api/v1/resolve?ref=ml4t/skills/ml4t-canonical-schema GET https://markdownregistry.com/api/v1/blob/063cfc074ef5e711beada38944d32abb63825dee2faeb94f63d6a052948a8278
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