yq

yq is a skill for Claude Code, Codex from eSlider/2dph. It costs 81 tokens per session (393 once invoked), scanned A, original, MIT.

A command-line tool for reading, filtering, converting, and editing structured files such as YAML, JSON, XML, CSV, TOML, and HCL. It refers specifically to the Go version by Mike Farah.

In plain words
What is it for?
Use it to inspect configuration files, select fields from command output, convert between formats, and process structured data.
Why use it?
It handles common data-format changes in short commands, reducing the need for custom scripts or several different tools.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/eslider/2dph/yq
Any agent
npx skills add eSlider/2dph --skill yq
Clone the repo
git clone --depth 1 https://github.com/eSlider/2dph

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for yq

README.md
[![agentmods](https://agentmods.dev/badge/skills/eslider/2dph/yq.svg)](https://agentmods.dev/skills/eslider/2dph/yq)
Your own site
<a href="https://agentmods.dev/skills/eslider/2dph/yq"><img src="https://agentmods.dev/badge/skills/eslider/2dph/yq.svg" alt="Measured on agentmods" height="20"></a>
Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 393 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00081 $0.00393
Opus 5 $0.00041 $0.00197
Sonnet 5 $0.00016 $0.00079
Haiku 4.5 $0.00008 $0.00039

Measured 3d ago against content hash e7270f03631b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

yq scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/yq/SKILL.md · 34 lines

What it actually says

yq (mikefarah)

Use https://github.com/mikefarah/yq to work with YAML, JSON, XML, CSV, TOML, HCL where it's efficient and less code.

This is the Go yq (yq --version contains mikefarah). It is not kislyuk/yq (Python, jq-syntax, YAML-only wrapper). scripts/db/psql-yq already calls this binary.

Prefer yq over python3 -c, jq, or ad-hoc parsers when one expression reads or converts the file. Keep Python/Go for HTTP, binary protocols, and in-process tests.

yq '.services.picoclaw.image' compose.yaml
yq -P . etc/picoclaw/config.json          # JSON → YAML
yq -o=json '.gates'                           # JSON stdin (qa/system_perf.go --json)
yq -p=csv -o=json .
yq -p=xml -o=json .
yq -p=toml '.package.name' file.toml
bin/brain/search.go "LadybugDB" --json | yq '.[].ref'
bin/web/search.go "hypervisor" --json | yq -r '.results[].url'

Do not print secrets, PII, or $HOME/.config/brain/ through yq.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 34 lines · 81 tokens per session scan A e7270f03631b

Subscribe to this mod's changes

yq is a skill published in the GitHub repository eSlider/2dph (2 stars, last pushed 4d ago), licensed MIT. It adds 81 tokens to every session and 393 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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