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.
npx agentmods add skills/stgime/posta-skill/postanpx skills add STGime/posta-skill --skill postagit clone --depth 1 https://github.com/STGime/posta-skillWhat 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 | $0.00109 | $0.04359 |
| Opus 5 | $0.00055 | $0.02180 |
| Sonnet 5 | $0.00022 | $0.00872 |
| Haiku 4.5 | $0.00011 | $0.00436 |
Grade A, and why
posta scanned grade A 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 2d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- curl How it starts
The opening of the file, as written. The whole thing — 436 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Posta — Social Media Content & Scheduling
Posta is a social media management platform that lets you create, schedule, and publish posts across Instagram, TikTok, Facebook, X/Twitter, LinkedIn, YouTube, Pinterest, Threads, and Bluesky.
This skill enables you to interact with the Posta API to manage social media content end-to-end: authenticate, list accounts, upload media, create/schedule/publish posts, generate AI content, and view analytics.
Setup
Authentication (one of the following)
POSTA_API_TOKEN— Recommended. Personal API token (starts withposta_). Long-lived, revocable, no password exposure.POSTA_EMAIL+POSTA_PASSWORD— Legacy login. The skill logs in and caches a JWT automatically.
If POSTA_API_TOKEN is set, email/password are not needed and the login flow is skipped entirely.
Optional Environment Variables
POSTA_BASE_URL— API base URL (default:https://api.getposta.app/v1)FAL_KEY— fal.ai API key (for image generation). Format is<key_id>:<key_secret>. Get one at https://fal.ai/dashboard/keys. The skill auto-discovers this from env vars,~/.posta/credentials, or.envfiles.
Captions and hashtags are written by Claude directly — no text-generation API key is needed. The only external content service is the image generator (fal.ai).
Credentials Auto-Discovery
The skill searches a fixed list of dedicated config files for POSTA_API_TOKEN (or legacy POSTA_EMAIL/POSTA_PASSWORD). Only exact variable names are matched — no other file content is read. Shell profiles (~/.zshrc, ~/.bashrc) are never accessed. Search order:
- Already-set environment variables (no file access)
~/.posta/credentials— dedicated Posta config file (preferred).env,.env.local,.env.productionin the working directory
If POSTA_API_TOKEN is found, the skill uses it immediately and skips email/password lookup. See SECURITY.md in the repo root for full details.
Helper Script
Source the bash helper for all API interactions:
What ships with it
5 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.
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.
- 2d ago First seen · 436 lines · 109 tokens per session scan A 56ed391efea8
posta is a skill published in the GitHub repository STGime/posta-skill (2 stars, last pushed 2mo ago), licensed MIT. It adds 109 tokens to every session and 4,359 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other skills, from other repositories
banner-design
Design banners for social media, ads, website heroes, creative assets, and print. Multiple art direction options with optional generated or supplied visuals. Actions: design, create, generate banner. Platforms: Facebook, Twitter/X, LinkedIn, YouTube, Instagram, Google Display, website hero, print. Styles: minimalist…
html-ppt-zhangzara-coral
OpenDesign's community-growth campaign across GitHub, Discord, and X: the loops, the content calendar, and the pipeline math. Built as a decision-grade marketing & GTM deck for growth team, community lead.
seo-image-gen
AI image generation for SEO assets: OG/social preview images, blog hero images, schema images, product photography, infographics. Powered by Gemini via nanobanana-mcp. Requires banana extension installed. Use when user says "generate image", "OG image", "social preview", "hero image", "blog image", "product photo"…
muapi-youtube-shorts
Auto-generate viral 9:16 YouTube Shorts (or TikTok / Reels clips) from a long-form video. Thin platform-aware wrapper around the AI Clipping skill — picks sensible defaults for short-form social platforms (9:16, 30–60s sweet spot) and delegates the actual highlight extraction + crop to muapi.ai's /ai-clipping endpoint.
short-form-pipeline
Skill "short-form-pipeline" from ericosiu/ai-marketing-skills, covering short-form video clip pipeline — skill, preamble (runs on skill start), version check (silent if up to date), prerequisites and quick start.
youtube-thumbnail
Generate a branded YouTube thumbnail from a video title. Uses a reference photo of the creator, high-CTR thumbnail principles, and brand colours to produce a ready-to-generate image prompt for Gemini. Use this skill whenever the user says "thumbnail", "youtube thumbnail", "build me a thumbnail", or wants a video cover…