# Julia Csv

> Parse and write delimited text data with CSV.jl, including CSV.File/CSV.read/CSV.Rows/CSV.Chunks for ingestion and CSV.write/CSV.RowWriter for output, with control over schema, delimiters, missing values, quoting, dates, pooling, and multithreading. Use this skill when handling CSV/TSV/fixed-width style files in Julia.

- **Type:** Skill
- **Install:** `agentstack add skill-krastanov-juliallmagentskills-julia-csv`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [Krastanov](https://agentstack.voostack.com/s/krastanov)
- **Installs:** 0
- **Category:** [Data & Analytics](https://agentstack.voostack.com/c/data-and-analytics)
- **Latest version:** 0.1.0
- **License:** Unlicense
- **Upstream author:** [Krastanov](https://github.com/Krastanov)
- **Source:** https://github.com/Krastanov/JuliaLLMAgentSkills/tree/master/julia-csv

## Install

```sh
agentstack add skill-krastanov-juliallmagentskills-julia-csv
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Julia Csv

Use CSV.jl for high-performance reading/writing of delimited data with explicit control over parsing behavior.

## Choose the Read Mode

- `CSV.File(input; kw...)`: full-column parse, table-like object, best default.
- `CSV.read(input, sink; kw...)`: parse and hand columns directly to sink (e.g. `DataFrame`) without intermediate copies.
- `CSV.Rows(input; kw...)`: row-streaming with lower memory footprint; supports `reusebuffer=true`.
- `CSV.Chunks(input; ntasks=...)`: chunked parsing for very large files.

```julia
using CSV, DataFrames

f = CSV.File("data.csv")
df = CSV.read("data.csv", DataFrame)
```

## Parse Schema and Layout Explicitly

Common schema/layout controls:
- `header`, `normalizenames`, `skipto`, `footerskip`
- `select` / `drop`, `limit`
- `types`, `typemap`, `stringtype`, `pool`, `downcast`
- `strict`, `silencewarnings`, `maxwarnings`

Delimiter and cell interpretation:
- `delim`, `ignorerepeated` (fixed-width style data)
- `missingstring`
- `quoted`, `quotechar` / `openquotechar` / `closequotechar`, `escapechar`
- `dateformat`, `decimal`, `groupmark`, `truestrings`, `falsestrings`

Threading and chunking:
- `ntasks`, `rows_to_check`

## Support Multiple Input Forms

CSV.jl supports:
- filename/filepath
- `IO` / `Cmd`
- `Vector{UInt8}`
- vector of inputs for vertical concatenation (matching schema)

Gzip (`.gz`) input is handled automatically; use `buffer_in_memory=true` if needed.

## Write CSV Output

```julia
CSV.write("out.csv", table)
rows = CSV.RowWriter(table)
```

Useful write controls:
- `delim`, `quotechar`, `openquotechar`, `closequotechar`, `escapechar`
- `missingstring`, `dateformat`, `decimal`
- `append`, `header`, `newline`, `quotestrings`
- `transform`, `bom`, `compress`, `partition`, `bufsize`

## Reference

- `references/csv-patterns.md` - read/write mode selection and option patterns

## Related Skills

- `julia-prettytables` - rendering parsed tabular data

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [Krastanov](https://github.com/Krastanov)
- **Source:** [Krastanov/JuliaLLMAgentSkills](https://github.com/Krastanov/JuliaLLMAgentSkills)
- **License:** Unlicense

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-krastanov-juliallmagentskills-julia-csv
- Seller: https://agentstack.voostack.com/s/krastanov
- Browse the marketplace: https://agentstack.voostack.com/browse

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