A skill for working with Jerry markdown documents through their document structure, called an abstract syntax tree (AST). It supports reading, searching, changing, checking, and rendering those documents.

Use it to parse, query, modify, validate, or render Jerry markdown files with the jerry ast command.

It lets you make structured document changes without treating the markdown as unorganized text. It also helps check that the document remains valid.

ast — Skill for Claude Code and Codex by geekatron: A skill for working with Jerry markdown documents through…

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/geekatron/jerry/ast

Any agent

npx skills add geekatron/jerry --skill ast

Clone the repo

git clone --depth 1 https://github.com/geekatron/jerry

Made for: Claude Code, Codex.

Or install jerry, the plugin that ships this one along with the rest of its 13 skills, 2 commands, 39 agents, 6 hooks.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/geekatron/jerry/ast.svg)](https://agentmods.dev/skills/geekatron/jerry/ast)

Your own site

<a href="https://agentmods.dev/skills/geekatron/jerry/ast"><img src="https://agentmods.dev/badge/skills/geekatron/jerry/ast.svg" alt="Measured on agentmods" height="20"></a>

Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,320 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin unknown 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.

Model	Per session	Once invoked
Fable 5	$0.00033	$0.02320
Opus 5	$0.00016	$0.01160
Sonnet 5	$0.00007	$0.00464
Haiku 4.5	$0.00003	$0.00232

Measured 3d ago against content hash 914f6784a1db, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ast 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.

The scan reads SKILL.md. This mod also ships 2 executable files (__init__.py, scripts/__init__.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/ast/SKILL.md · 293 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

3d ago First seen · 293 lines · 33 tokens per session scan A 914f6784a1db

Subscribe to this mod's changes

ast is a skill published in the GitHub repository geekatron/jerry (31 stars, last pushed yesterday), with no licence file. It adds 33 tokens to every session and 2,320 once invoked, about $0.0002 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 2026-08-30.

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