Openpets
OpenPetsHQ/openpets
A skill your agent uses whenever the user wants to build, extend, debug, test, validate, locally load, package, or publish an OpenPets plugin; work with the OpenPets Plugin SDK v3, plugin manifest…
Guide for creating and implementing plugins to extend OpenCode functionality, including hooks, custom tools, and event handling.
Install Opencode Plugin Development
$ npx skills add sandgardenhq/sgai --skill opencode-plugin-development -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install sandgardenhq/sgai opencode-plugin-development --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .claude/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/opencode-plugin-development .claude/skills/opencode-plugin-development && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "opencode-plugin-development" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/opencode-plugin-development into .claude/skills/opencode-plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opencode-plugin-development", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/opencode-plugin-developmentType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add sandgardenhq/sgai --skill opencode-plugin-development -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install sandgardenhq/sgai opencode-plugin-development --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .agents/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/opencode-plugin-development .agents/skills/opencode-plugin-development && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "opencode-plugin-development" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/opencode-plugin-development into .agents/skills/opencode-plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opencode-plugin-development", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add sandgardenhq/sgai --skill opencode-plugin-development -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install sandgardenhq/sgai opencode-plugin-development --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/opencode-plugin-development .cursor/skills/opencode-plugin-development && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "opencode-plugin-development" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/opencode-plugin-development into .cursor/skills/opencode-plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opencode-plugin-development", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/sandgardenhq/sgai.git --path cmd/sgai/skel/.sgai/skills/opencode-plugin-development--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add sandgardenhq/sgai --skill opencode-plugin-development -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install sandgardenhq/sgai opencode-plugin-development --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/opencode-plugin-development .gemini/skills/opencode-plugin-development && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "opencode-plugin-development" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/opencode-plugin-development into .gemini/skills/opencode-plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opencode-plugin-development", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install sandgardenhq/sgai opencode-plugin-developmentInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add sandgardenhq/sgai --skill opencode-plugin-development -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .github/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/opencode-plugin-development .github/skills/opencode-plugin-development && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "opencode-plugin-development" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/opencode-plugin-development into .github/skills/opencode-plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opencode-plugin-development", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add sandgardenhq/sgai --skill opencode-plugin-development -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install sandgardenhq/sgai opencode-plugin-development --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/opencode-plugin-development .opencode/skills/opencode-plugin-development && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "opencode-plugin-development" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/opencode-plugin-development into .opencode/skills/opencode-plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "opencode-plugin-development", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
opencode-plugin-development- GitHub stars
- 137
- Token cost
- ~1.2k tokens
- SKILL.md length
- 289 words
- Files
- 1
- Skills in repo
- 55
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Guide for creating and implementing plugins to extend OpenCode functionality, including hooks, custom tools, and event handling.
- Works in 2 steps: .sgai/plugin directory in your project → Or globally in ~/.config/opencode/plugin
- Tasks that involve Hooks and plugins
- SKILL.md covers Overview, When to Use, Plugin Structure and Plugin Location, plus 5 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Opencode Plugin Development is an agent skill from sandgardenhq/sgai. Guide for creating and implementing plugins to extend OpenCode functionality, including hooks, custom tools, and event handling. When you need to add custom functionality to OpenCode, such as notifications, custom tools, or modifying behavior.
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Agent Workflows, covering Hooks and plugins. It works with TypeScript. The repository describes itself as: Sandgarden AI Software Factory.
When your agent uses it
- Tasks that involve Hooks and plugins
Example prompts
- “/opencode-plugin-development”
Workflow steps
2 steps, taken from the first numbered list in SKILL.md.
- .sgai/plugin directory in your project
- Or globally in ~/.config/opencode/plugin
What it can do on your machine
Read from SKILL.md and the folder at commit 9efbb7b. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are javascript and typescript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Opencode Plugin Development loads about 1.2k tokens when it runs. Until then it costs about 68 tokens; SKILL.md has 289 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NoteMentions a .env fileSKILL.md:105
"read" && output.args.filePath.includes(".env")) { - NoteMentions a .env fileSKILL.md:106
throw new Error("Do not read .env files")
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 289 words (~1,196 tokens).
“Plugins allow you to extend OpenCode by hooking into various events, adding custom tools, and customizing behavior. This skill guides you through creating plugins using JavaScript/TypeScript modules that export plugin functions.”
- name
- opencode-plugin-development
Files
Just SKILL.md in cmd/sgai/skel/.sgai/skills/opencode-plugin-development of sandgardenhq/sgai.
Open the folder on GitHubat commit 9efbb7b
Compare with similar skills
Opencode Plugin Development next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Opencode Plugin Development this skillsandgardenhq/sgai | 137 | — | ~1.2k | Automated safety check: Notes | Custom licence | |
| OpenpetsOpenPetsHQ/openpets | 1.3k | — | ~2.1k | Automated safety check: Pass | MIT | |
| OpenCode Plugin CreatorDevin-AXIS/iPolloWork | 6.7k | 1 repos | ~1.3k | Automated safety check: Pass | Custom licence | |
| Build Pluginopentabs-dev/opentabs | 967 | — | ~190 | Automated safety check: Pass | MIT | |
| Create Modruvnet/ruflo | 74k | — | ~984 | Automated safety check: Notes | MIT | |
| Typescript Hook Writerpr-pm/prpm | 122 | — | ~8.6k | Automated safety check: Notes | MIT |
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Works with
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Questions about Opencode Plugin Development
What does Opencode Plugin Development do?
Guide for creating and implementing plugins to extend OpenCode functionality, including hooks, custom tools, and event handling. Opencode Plugin Development is an agent skill from sandgardenhq/sgai. Guide for creating and implementing plugins to extend OpenCode functionality, including hooks, custom tools, and event handling.
When should I use Opencode Plugin Development?
Opencode Plugin Development fits situations like: tasks that involve Hooks and plugins.
How do I install Opencode Plugin Development in Claude Code?
Run `npx skills add sandgardenhq/sgai --skill opencode-plugin-development -a claude-code`. Or copy the skill folder (cmd/sgai/skel/.sgai/skills/opencode-plugin-development in sandgardenhq/sgai) into .claude/skills/opencode-plugin-development in your project. Claude Code loads it when a task matches its description.
How do I install Opencode Plugin Development in Codex?
Run `npx skills add sandgardenhq/sgai --skill opencode-plugin-development -a codex`. Or copy the skill folder (cmd/sgai/skel/.sgai/skills/opencode-plugin-development in sandgardenhq/sgai) into .agents/skills/opencode-plugin-development in your project. Codex loads it when a task matches its description.
Can I use Opencode Plugin Development in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add sandgardenhq/sgai --skill opencode-plugin-development -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/opencode-plugin-development, .gemini/skills/opencode-plugin-development, .github/skills/opencode-plugin-development and .opencode/skills/opencode-plugin-development in your project.
What does Opencode Plugin Development need to run?
SKILL.md names no scripts, command-line tools or credentials: Opencode Plugin Development is instructions for the agent only.
Does Opencode Plugin Development access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Opencode Plugin Development safe to install?
Our automated static check of SKILL.md found notes only (mentions a .env file), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.
What licence does Opencode Plugin Development use?
Opencode Plugin Development has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Opencode Plugin Development use?
About 1.2k tokens (SKILL.md is roughly 4.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Opencode Plugin Development?
Skills that share tags, products or a category with Opencode Plugin Development: Openpets (OpenPetsHQ/openpets, 1.3k stars), OpenCode Plugin Creator (Devin-AXIS/iPolloWork, 6.7k stars), Build Plugin (opentabs-dev/opentabs, 967 stars) and Create Mod (ruvnet/ruflo, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Opencode Plugin Development?
sandgardenhq (a GitHub organization) maintains it in sandgardenhq/sgai, which has 137 GitHub stars. The repository holds 55 skills in this directory. The repository was last updated on September 21, 2026.
Source: sandgardenhq/sgai on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.