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Merge authorized after exact-head validation and paired evaluation checks passed. The follow-up Droid review run on head df31b25 stalled in the model step and ended with an automation error; its actionable findings from the prior review were fixed and independently verified.
45 lines
2.1 KiB
Markdown
45 lines
2.1 KiB
Markdown
# data-cleaning
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A practical, evidence-first workflow for turning messy data into trustworthy, reviewable datasets.
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## Why Install This Skill
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Messy data is not solved by a handful of `dropna()` calls. This skill helps an agent discover what is wrong, decide what may safely change, preserve what was observed, and demonstrate that the result still matches the intended grain and meaning.
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It works across CSV, JSON, text, DataFrames, SQL extracts, and pipeline boundaries. It combines a repeatable methodology with tool-selection guidance, reusable plans and reports, and a dependency-free profiling script that produces machine-readable evidence before mutation.
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## What You Get
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| Path | Purpose |
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|---|---|
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| `SKILL.md` | Core workflow and completion gate |
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| `references/` | Methodology, operations, validation, tools, sources |
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| `templates/` | Cleaning plan, decision log, transformation log, exception register, schema contract, quality report |
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| `scripts/profile_dataset.py` | Read-only CSV/TSV/JSONL profiler |
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| `scripts/reconcile_dataset.py` | Read-only key, row-count, and aggregate reconciliation |
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| `scripts/test_*` | Deterministic tests for bundled scripts |
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| `evals/evals.json` | Output-quality evaluation cases |
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## Quick Start
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```bash
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python3 scripts/profile_dataset.py input.csv --output profile.json
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python3 scripts/profile_dataset.py input.csv --max-rows 10000
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```
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The profiler does not edit the input. Use its report to fill `templates/cleaning-plan.md`, then validate the transformed output against `templates/schema-contract.yml` or a project-specific contract.
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## Triggers
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- Clean or standardize CSV, JSON, text, spreadsheet exports, or DataFrames
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- Diagnose missing values, duplicates, malformed types, dates, encodings, or categories
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- Design a reusable cleaning pipeline or data-quality contract
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- Choose among pandas, Polars, pyjanitor, Pandera, Great Expectations, OpenRefine, Frictionless, dbt tests, or Spark-scale tools
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- Review whether cleaning is reproducible, safe, or leakage-free
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## Requirements
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- Python 3.9+ for the bundled script
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- No external dependency for first-pass profiling
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- Optional ecosystem tools require their own installations
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