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forsion-extension-development

forsion-extension-development is a skill for Claude Code, Codex from Changan-Su/Forsion. It costs 143 tokens per session (53,163 once invoked), scanned A, original, no licence file.

Development guidance for making extensions for Forsion or Tangu, including plugins, themes, Spaces, agents, and bundles. It includes five official templates and explains their formats and constraints.

In plain words
What is it for?
Create, package, or prepare a Forsion or Tangu extension for distribution or marketplace listing.
Why use it?
It provides a known starting structure and helps avoid confusing the two different plugin systems.

Skill for Claude CodeCodex

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

not rated 176repo +8 changed today A scan 143 tokens custom licence

Good fit Create, package, or prepare a Forsion or Tangu extension for distribution or marketplace listing.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/changan-su/forsion/forsion-plugin
View source ↗ Changan-Su/Forsion forsion.net
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 Changan-Su/Forsion --skill forsion-plugin
Clone the repo
git clone --depth 1 https://github.com/Changan-Su/Forsion

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 forsion-extension-development

README.md
[![agentmods](https://agentmods.dev/badge/skills/changan-su/forsion/forsion-plugin/github.svg)](https://agentmods.dev/skills/changan-su/forsion/forsion-plugin)
Your own site
<a href="https://agentmods.dev/skills/changan-su/forsion/forsion-plugin"><img src="https://agentmods.dev/badge/skills/changan-su/forsion/forsion-plugin/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 forsion-extension-development

Your own site · 80×15
<a href="https://agentmods.dev/skills/changan-su/forsion/forsion-plugin"><img src="https://agentmods.dev/badge/skills/changan-su/forsion/forsion-plugin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 143 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 53,163 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.00143 $0.53163
Opus 5.5 $0.00057 $0.21265
Sonnet 5.5 $0.00029 $0.10633
Haiku 4.5 $0.00014 $0.05316

Measured today against content hash c69d0a607c2c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

forsion-extension-development 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 today.

The scan reads SKILL.md. This mod also ships 9 executable files (samples/forsion-sample-appearance/main.js, samples/forsion-sample-bundle/check.mjs, samples/forsion-sample-bundle/main.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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- **内嵌贴图**:GLTFLoader 在 Chromium 上用 `ImageBitmapLoader`,对内嵌图片走 `fetch(blob:)`;`.gltf` 里 base64 的 buffer 走 `fetch(data:)`。
tangu-agent/skills/forsion-plugin/SKILL.md · 1,328 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

47 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. today Changed · +36 lines c69d0a607c2c
  2. yesterday Changed · +25 lines dfcbd9554bcd
  3. 3d ago Changed · -134 lines e4e3e65e3100
  4. 4d ago Changed · +15 lines 5f0d4f09124a
  5. 5d ago Changed · +36 lines ee7b4e24c334
  6. 7d ago Changed · +3 lines 0584b9dbaef9
  7. 8d ago Changed · +6 lines f404fe23ba7c
  8. 9d ago Changed · -56 lines e5cb0bbefc06
  9. 10d ago Changed · +10 lines 04fb3ba28d00
  10. 11d ago First seen · 1,387 lines · 143 tokens per session scan A ac6506f60f52

Subscribe to this mod's changes

forsion-extension-development is a skill published in the GitHub repository Changan-Su/Forsion (176 stars, last pushed today), with no licence file. It adds 143 tokens to every session and 53,163 once invoked, about $0.0006 per session on Opus 5.5. 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 2026-08-30.

Building agentsai-agentsautomationcodingdesktop-applocal-firstnotebook
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