tweet-writer

tweet-writer is a skill for Claude Code from vanzan01/claude-agent-sdk-starter. It costs 10 tokens per session (574 once invoked), scanned A, original, MIT.

Formatting instructions for writing tweets, which are short messages posted on a social network. They require a specific length, hashtag, emoji, and output format.

In plain words
What is it for?
Use them to turn provided information into a single raw tweet that follows the stated character, hashtag, emoji, and formatting rules.
Why use it?
They prevent extra explanation or formatting from making the generated message unsuitable for direct posting.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Good fit Use them to turn provided information into a single raw tweet that follows the stated character, hashtag, emoji, and formatting rules.

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Install with agentmods
npx agentmods add skills/vanzan01/claude-agent-sdk-starter/tweet-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 vanzan01/claude-agent-sdk-starter --skill tweet-writer
Clone the repo
git clone --depth 1 https://github.com/vanzan01/claude-agent-sdk-starter

Made for: Claude Code.

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 tweet-writer

README.md
[![agentmods](https://agentmods.dev/badge/skills/vanzan01/claude-agent-sdk-starter/tweet-writer/github.svg)](https://agentmods.dev/skills/vanzan01/claude-agent-sdk-starter/tweet-writer)
Your own site
<a href="https://agentmods.dev/skills/vanzan01/claude-agent-sdk-starter/tweet-writer"><img src="https://agentmods.dev/badge/skills/vanzan01/claude-agent-sdk-starter/tweet-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 tweet-writer

Your own site · 80×15
<a href="https://agentmods.dev/skills/vanzan01/claude-agent-sdk-starter/tweet-writer"><img src="https://agentmods.dev/badge/skills/vanzan01/claude-agent-sdk-starter/tweet-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 10 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 574 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 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 $0.00010 $0.00574
Opus 5 $0.00005 $0.00287
Sonnet 5 $0.00002 $0.00115
Haiku 4.5 $0.00001 $0.00057

Measured 10d ago against content hash b31d79d91d71, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

tweet-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 10d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/validate-tweet.js, scripts/validate.js), 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.

.claude/skills/tweet-writer/SKILL.md · 90 lines

How it starts

The opening of the file, as written. The whole thing — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Tweet Writer

For detailed context, see reference.md and examples.md.

Output Format

Output ONLY the raw tweet text. Nothing else.

Rules

  1. Maximum 280 characters
  2. Must include at least one hashtag (#)
  3. Must include at least one emoji
  4. NO quotes around the tweet
  5. NO explanations before or after
  6. NO character counts
  7. NO markdown formatting (no **, no headers)
  8. NO JSON wrapping

Examples

WRONG (has explanation):

Here's a tweet about this news:
"OpenAI dropped GPT-5!"

WRONG (has markdown):

**Tweet:**
OpenAI dropped GPT-5!

WRONG (JSON format):

{"tweet": "OpenAI dropped GPT-5!"}

CORRECT (raw tweet only):

OpenAI dropped GPT-5 with massively improved reasoning. The AI race just got real. 🔥 #AI #GPT5
Google's new AI can now write code better than 90% of engineers. The hype-to-profit gap is real. 🤖 #AI #GoogleAI
Meta just open-sourced their best model. The democratization of AI continues. 🚀 #OpenSource #AI
Anthropic ships Claude 4 with unprecedented safety features. Finally, responsible scaling in action. 🛡️ #Claude #AIethics

Your output should look EXACTLY like one of the examples above - just the tweet text, nothing else.

BEFORE YOU OUTPUT - MANDATORY CHECKS:

CHARACTER COUNT: ❌ Is my tweet longer than 280 characters? → SHORTEN IT ✅ Is my tweet 280 characters or less? → GOOD!

FORMAT: ❌ Does my output start with "Tweet:" or "Here's a tweet"? → REMOVE IT ❌ Is my tweet wrapped in quotes "..."? → REMOVE QUOTES ❌ Is my tweet wrapped in JSON {...}? → REMOVE JSON ❌ Does my output contain ** or ## or ```? → REMOVE MARKDOWN ❌ Do I have explanations before/after the tweet? → REMOVE THEM

REQUIRED ELEMENTS: ❌ Missing hashtag (#)? → ADD ONE ❌ Missing emoji? → ADD ONE ✅ Has hashtag AND emoji? → GOOD!

FINAL CHECK: ✅ Is my output ONLY the raw tweet text (no extra text, no formatting)? ✅ Is it under 280 characters? ✅ Does it have emoji + hashtag? → If all YES, output it. If any NO, fix it first.

Read the full file on GitHub · 90 lines

Files

What ships with it

4 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. 10d ago First seen · 90 lines · 10 tokens per session scan A b31d79d91d71

Subscribe to this mod's changes

tweet-writer is a skill published in the GitHub repository vanzan01/claude-agent-sdk-starter (9 stars, last pushed 4mo ago), licensed MIT. It adds 10 tokens to every session and 574 once invoked, about $0.0001 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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