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skill-writer

skill-writer is a skill for Claude Code, Codex from getsentry/warden. It costs 83 tokens per session (2,070 once invoked), scanned A, original, no licence file.

A skill for creating and improving agent skills, which are instruction packages that teach an agent how to handle a particular kind of work. It follows the Agent Skills specification.

In plain words
What is it for?
Use it to create, synthesize, improve, update, or maintain agent skills and their registration documentation.
Why use it?
It helps organize skill instructions and refine them over time instead of writing undocumented prompts from scratch. The input does not describe its exact output files or workflow.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

not rated 418repo 2d ago A scan 83 tokens custom licence

Good fit Use it to create, synthesize, improve, update, or maintain agent skills and their registration documentation.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/getsentry/warden/skill-writer
View source ↗ getsentry/warden warden.sentry.dev
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.

Any agent
npx skills add getsentry/warden --skill skill-writer
Clone the repo
git clone --depth 1 https://github.com/getsentry/warden

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 skill-writer

README.md
[![agentmods](https://agentmods.dev/badge/skills/getsentry/warden/skill-writer/github.svg)](https://agentmods.dev/skills/getsentry/warden/skill-writer)
Your own site
<a href="https://agentmods.dev/skills/getsentry/warden/skill-writer"><img src="https://agentmods.dev/badge/skills/getsentry/warden/skill-writer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for skill-writer

Your own site · 80×15
<a href="https://agentmods.dev/skills/getsentry/warden/skill-writer"><img src="https://agentmods.dev/badge/skills/getsentry/warden/skill-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 83 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,070 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00083 $0.02070
Opus 5.5 $0.00033 $0.00828
Sonnet 5.5 $0.00017 $0.00414
Haiku 4.5 $0.00008 $0.00207

Measured 1mo ago against content hash dcada5aeeac2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skill-writer 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 1mo ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/quick_validate_test.py, scripts/quick_validate.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.

packages/warden/src/internal-skills/skill-writer/SKILL.md · 160 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

44 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.

  1. 1mo ago First seen · 160 lines · 83 tokens per session scan A dcada5aeeac2

Subscribe to this mod's changes

skill-writer is a skill published in the GitHub repository getsentry/warden (418 stars, last pushed 2d ago), with no licence file. It adds 83 tokens to every session and 2,070 once invoked, about $0.0003 per session on Opus 5.5. 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.

Building agentstag-production
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