x-writer

x-writer is a skill for Claude Code from ognjengt/founder-skills. It costs 37 tokens per session (2,703 once invoked), scanned B, original, MIT.

A writing workflow for creating three X, formerly called Twitter, posts in different formats and matching a chosen creator's voice. It uses supplied post examples, format guidance, and voice profiles.

In plain words
What is it for?
Use it when you have a topic or idea and need several X post drafts designed around established formats and a specified voice.
Why use it?
Writing posts that fit a particular style and structure is difficult to do consistently without reference material.

Skill for Claude Code

Written for Claude Code: $ARGUMENTS substitution. Also seen: names the AskUserQuestion tool.

Part of the founder-skills plugin — 15 skills shipped together

Good fit Use it when you have a topic or idea and need several X post drafts designed around established formats and a specified voice.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ognjengt/founder-skills/x-writer
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 ognjengt/founder-skills --skill x-writer
Clone the repo
git clone --depth 1 https://github.com/ognjengt/founder-skills

Made for: Claude Code.

Or install founder-skills, the plugin that ships this one along with the rest of its 15 skills.

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 x-writer

README.md
[![agentmods](https://agentmods.dev/badge/skills/ognjengt/founder-skills/x-writer/github.svg)](https://agentmods.dev/skills/ognjengt/founder-skills/x-writer)
Your own site
<a href="https://agentmods.dev/skills/ognjengt/founder-skills/x-writer"><img src="https://agentmods.dev/badge/skills/ognjengt/founder-skills/x-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 x-writer

Your own site · 80×15
<a href="https://agentmods.dev/skills/ognjengt/founder-skills/x-writer"><img src="https://agentmods.dev/badge/skills/ognjengt/founder-skills/x-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,703 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • Socket pass 18 Mar 2026
  • Snyk pass 15 Feb 2026
How audits are shown
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 5.1 $0.00037 $0.02703
Opus 5 $0.00018 $0.01352
Sonnet 5 $0.00007 $0.00541
Haiku 4.5 $0.00004 $0.00270

Measured 11d ago against content hash c906e2b531b0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade B, and why

x-writer scanned grade B with 1 finding 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 11d 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.

Strips warnings and disclaimersmediumAnti-refusal

Omitting safety caveats hides risk from the user and is a common jailbreak preamble.

- **Comparison:** Stark, obvious contrast. Don't lecture — let the contrast make the point.
skills/x-writer/SKILL.md · 281 lines

How it starts

The opening of the file, as written. The whole thing — 281 lines — stays where its author put it; the contents beside it link to each section on GitHub.

X Writer

Purpose

Generate 3 viral X posts in different proven formats, matched to a creator voice, using battle-tested templates and patterns that drive engagement.


Execution Logic

Check $ARGUMENTS first to determine execution mode:

If $ARGUMENTS is empty or not provided:

Respond with: "x-writer loaded, proceed with your topic or idea"

Then wait for the user to provide their requirements in the next message.

If $ARGUMENTS contains content:

Proceed immediately to Task Execution (skip the "loaded" message).


Task Execution

When user requirements are available (either from initial $ARGUMENTS or follow-up message):

1. MANDATORY: Read Reference Files FIRST

BLOCKING REQUIREMENT — DO NOT SKIP THIS STEP

Before doing ANYTHING else, you MUST use the Read tool to read ALL three reference files. This is non-negotiable:

Read: ./references/formats.md
Read: ./references/posts.md
Read: ./references/voices.md

What you will find:

  • formats.md: 8 proven post formats with structure templates, psychology, and format-specific rules
  • posts.md: 49+ proven viral posts organized by format type — the example library
  • voices.md: Creator voice profiles with writing DNA, signature patterns, and example posts

DO NOT PROCEED to Step 2 until you have read all three files and have their content in context.

2. Check for Business Context

Check if FOUNDER_CONTEXT.md exists in the project root.

  • If it exists: Read it and use the business context to personalize output (industry terminology, audience pain points, brand voice, company name, products).
  • If it doesn't exist: Proceed using defaults from "Defaults & Assumptions."

3. Analyze Input & Select Voice

From the user's requirements, extract:

  • Topic/idea — What they want to post about
  • Goal — What they want the post to achieve (engagement, authority, education, humor)
  • Voice preference — If they specified a voice or tone

Voice Matching Logic:

Read the full file on GitHub · 281 lines

Files

What ships with it

3 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. 11d ago First seen · 281 lines · 37 tokens per session scan B c906e2b531b0

Subscribe to this mod's changes

x-writer is a skill published in the GitHub repository ognjengt/founder-skills (300 stars, last pushed 3mo ago), licensed MIT. It adds 37 tokens to every session and 2,703 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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