Claude Code Agent Development
anthropics/claude-plugins-official
Explains how to write agents for Claude Code plugins: the markdown file with YAML frontmatter, trigger descriptions, model and color settings, and system prompt design.
Shared return contract for SGAI Task subagents. An agent skill from sandgardenhq/sgai.
Install Subagent Return Protocol
$ npx skills add sandgardenhq/sgai --skill subagent-return-protocol -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install sandgardenhq/sgai subagent-return-protocol --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/subagent-return-protocol .claude/skills/subagent-return-protocol && 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 "subagent-return-protocol" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/subagent-return-protocol into .claude/skills/subagent-return-protocol/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "subagent-return-protocol", 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/subagent-return-protocolType 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 subagent-return-protocol -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install sandgardenhq/sgai subagent-return-protocol --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/subagent-return-protocol .agents/skills/subagent-return-protocol && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "subagent-return-protocol" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/subagent-return-protocol into .agents/skills/subagent-return-protocol/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "subagent-return-protocol", 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 subagent-return-protocol -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install sandgardenhq/sgai subagent-return-protocol --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/subagent-return-protocol .cursor/skills/subagent-return-protocol && 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 "subagent-return-protocol" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/subagent-return-protocol into .cursor/skills/subagent-return-protocol/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "subagent-return-protocol", 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/subagent-return-protocol--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 subagent-return-protocol -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install sandgardenhq/sgai subagent-return-protocol --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/subagent-return-protocol .gemini/skills/subagent-return-protocol && 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 "subagent-return-protocol" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/subagent-return-protocol into .gemini/skills/subagent-return-protocol/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "subagent-return-protocol", 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 subagent-return-protocolInstalls 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 subagent-return-protocol -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/subagent-return-protocol .github/skills/subagent-return-protocol && 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 "subagent-return-protocol" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/subagent-return-protocol into .github/skills/subagent-return-protocol/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "subagent-return-protocol", 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 subagent-return-protocol -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 subagent-return-protocol --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/subagent-return-protocol .opencode/skills/subagent-return-protocol && 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 "subagent-return-protocol" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/subagent-return-protocol into .opencode/skills/subagent-return-protocol/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "subagent-return-protocol", 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
subagent-return-protocol- GitHub stars
- 137
- Token cost
- ~604 tokens
- SKILL.md length
- 226 words
- Files
- 1
- Skills in repo
- 53
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Shared return contract for SGAI Task subagents. An agent skill from sandgardenhq/sgai.
- Tasks that involve Subagents
- SKILL.md covers Core Rules, Execution Envelope, Review Envelope and Status Meanings, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Subagent Return Protocol is an agent skill from sandgardenhq/sgai. Shared return contract for SGAI Task subagents. Use before any delegated implementation, deployment, writing, verification, review, or project-critic subagent reports back to its caller.
Its SKILL.md is about 600 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 Subagents. The repository describes itself as: Sandgarden AI Software Factory.
When your agent uses it
- Tasks that involve Subagents
Example prompts
- “/subagent-return-protocol”
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 markdown).
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
Subagent Return Protocol loads about 604 tokens when it runs. Until then it costs about 53 tokens; SKILL.md has 226 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 passed
The automated check found no risky patterns in SKILL.md.
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 226 words (~604 tokens).
“Use this skill when a Task subagent reports completion, concerns, missing context, review findings, or blockers to the agent that invoked it.”
- name
- subagent-return-protocol
Files
Just SKILL.md in cmd/sgai/skel/.sgai/skills/subagent-return-protocol of sandgardenhq/sgai.
Open the folder on GitHubat commit 9efbb7b
Compare with similar skills
Subagent Return Protocol 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 |
|---|---|---|---|---|---|---|
| Subagent Return Protocol this skillsandgardenhq/sgai | 137 | — | ~604 | Automated safety check: Pass | Custom licence | |
| Claude Code Agent Developmentanthropics/claude-plugins-official | 38k | 7 repos | ~2.8k | Automated safety check: Pass | Apache-2.0 | |
| Subagent Driven DevelopmentAsvarox/allkaraoke | 261 | 37 repos | ~1.2k | Automated safety check: Pass | None | |
| Dispatching Parallel Agentsultralisp/ultralisp | 258 | 40 repos | ~1.5k | Automated safety check: Pass | None | |
| Paseo Advisor Second Opiniongetpaseo/paseo | 20k | 1 repos | ~756 | Automated safety check: Pass | Custom licence | |
| Task Observerrebelytics/one-skill-to-rule-them-all | 3.2k | 1 repos | ~12k | Automated safety check: Pass | CC-BY-4.0 |
Similar skills
- Official
Subagent Driven Development
Asvarox/allkaraoke
A skill your agent uses when executing implementation plans with independent tasks in the current session
Dispatching Parallel Agents
ultralisp/ultralisp
A skill your agent uses when facing 2+ independent tasks that can be worked on without shared state or sequential dependencies
Paseo Advisor Second Opinion
getpaseo/paseo
Launches one separate agent through Paseo to give a second opinion on the current task, with a self-contained briefing and no permission to edit files.
Task Observer
rebelytics/one-skill-to-rule-them-all
Monitors task execution for skill improvement opportunities.
O2 Review Loop
openobserve/openobserve
Splits a change into planner, coder and independent reviewer roles: you confirm a spec, a subagent implements it, and a separate reviewer checks each round's local WIP commit.
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Related
Categories
Questions about Subagent Return Protocol
What does Subagent Return Protocol do?
Shared return contract for SGAI Task subagents. An agent skill from sandgardenhq/sgai. Subagent Return Protocol is an agent skill from sandgardenhq/sgai. Shared return contract for SGAI Task subagents.
When should I use Subagent Return Protocol?
Subagent Return Protocol fits situations like: tasks that involve Subagents.
How do I install Subagent Return Protocol in Claude Code?
Run `npx skills add sandgardenhq/sgai --skill subagent-return-protocol -a claude-code`. Or copy the skill folder (cmd/sgai/skel/.sgai/skills/subagent-return-protocol in sandgardenhq/sgai) into .claude/skills/subagent-return-protocol in your project. Claude Code loads it when a task matches its description.
How do I install Subagent Return Protocol in Codex?
Run `npx skills add sandgardenhq/sgai --skill subagent-return-protocol -a codex`. Or copy the skill folder (cmd/sgai/skel/.sgai/skills/subagent-return-protocol in sandgardenhq/sgai) into .agents/skills/subagent-return-protocol in your project. Codex loads it when a task matches its description.
Can I use Subagent Return Protocol 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 subagent-return-protocol -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/subagent-return-protocol, .gemini/skills/subagent-return-protocol, .github/skills/subagent-return-protocol and .opencode/skills/subagent-return-protocol in your project.
What does Subagent Return Protocol need to run?
SKILL.md names no scripts, command-line tools or credentials: Subagent Return Protocol is instructions for the agent only.
Does Subagent Return Protocol 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 Subagent Return Protocol safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Subagent Return Protocol use?
Subagent Return Protocol 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 Subagent Return Protocol use?
About 604 tokens (SKILL.md is roughly 2.4k 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 Subagent Return Protocol?
Skills that share tags, products or a category with Subagent Return Protocol: Claude Code Agent Development (anthropics/claude-plugins-official, 38k stars), Subagent Driven Development (Asvarox/allkaraoke, 261 stars), Dispatching Parallel Agents (ultralisp/ultralisp, 258 stars) and Paseo Advisor Second Opinion (getpaseo/paseo, 20k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Subagent Return Protocol?
sandgardenhq (a GitHub organization) maintains it in sandgardenhq/sgai, which has 137 GitHub stars. The repository holds 53 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.