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.
Recovery strategy when a subagent is stuck on a hard task. An agent skill from opensage-agent/opensage-adk.
Install Multi Model
$ npx skills add opensage-agent/opensage-adk --skill multi-model -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install opensage-agent/opensage-adk multi-model --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/opensage-agent/opensage-adk.git skills-src && mkdir -p .claude/skills && cp -r skills-src/src/opensage/bash_tools/workflow/multi-model .claude/skills/multi-model && 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 "multi-model" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/workflow/multi-model into .claude/skills/multi-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "multi-model", 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/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/workflow/multi-modelType 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 opensage-agent/opensage-adk --skill multi-model -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install opensage-agent/opensage-adk multi-model --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/opensage-agent/opensage-adk.git skills-src && mkdir -p .agents/skills && cp -r skills-src/src/opensage/bash_tools/workflow/multi-model .agents/skills/multi-model && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "multi-model" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/workflow/multi-model into .agents/skills/multi-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "multi-model", 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 opensage-agent/opensage-adk --skill multi-model -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install opensage-agent/opensage-adk multi-model --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/opensage-agent/opensage-adk.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/src/opensage/bash_tools/workflow/multi-model .cursor/skills/multi-model && 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 "multi-model" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/workflow/multi-model into .cursor/skills/multi-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "multi-model", 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/opensage-agent/opensage-adk.git --path src/opensage/bash_tools/workflow/multi-model--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 opensage-agent/opensage-adk --skill multi-model -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install opensage-agent/opensage-adk multi-model --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/opensage-agent/opensage-adk.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/src/opensage/bash_tools/workflow/multi-model .gemini/skills/multi-model && 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 "multi-model" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/workflow/multi-model into .gemini/skills/multi-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "multi-model", 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 opensage-agent/opensage-adk multi-modelInstalls 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 opensage-agent/opensage-adk --skill multi-model -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/opensage-agent/opensage-adk.git skills-src && mkdir -p .github/skills && cp -r skills-src/src/opensage/bash_tools/workflow/multi-model .github/skills/multi-model && 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 "multi-model" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/workflow/multi-model into .github/skills/multi-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "multi-model", 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 opensage-agent/opensage-adk --skill multi-model -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install opensage-agent/opensage-adk multi-model --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/opensage-agent/opensage-adk.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/src/opensage/bash_tools/workflow/multi-model .opencode/skills/multi-model && 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 "multi-model" agent skill from https://github.com/opensage-agent/opensage-adk/tree/main/src/opensage/bash_tools/workflow/multi-model into .opencode/skills/multi-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "multi-model", 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
multi-model- GitHub stars
- 127
- Token cost
- ~595 tokens
- SKILL.md length
- 247 words
- Files
- 1
- Skills in repo
- 21
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Recovery strategy when a subagent is stuck on a hard task. An agent skill from opensage-agent/opensage-adk.
- Works in 4 steps: Decide the original is stuck (no… → Try 3a first (cheaper — same model,… → Still failing → try 3b with each… → …
- Tasks that involve Subagents
- SKILL.md covers Usage, Common Use Cases and Requires Sandbox
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Multi Model is an agent skill from opensage-agent/opensage-adk. Recovery strategy when a subagent is stuck on a hard task. Two escape hatches: spawn a fresh-context instance with the same model, or retry with a different model from the registry.
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 licence is Apache-2.0.
When your agent uses it
- Tasks that involve Subagents
Example prompts
- “/multi-model”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Decide the original is stuck (no progress in N tool calls, or final answer is complain-shaped).
- Try 3a first (cheaper — same model, fresh context). One attempt.
- Still failing → try 3b with each alternate model in get_available_models(), sync mode, in sequence.
- If multiple alternates also fail → emit complain with the accumulated evidence. Don't loop forever.
What it can do on your machine
Read from SKILL.md and the folder at commit 54d6470. 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.
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
Multi Model loads about 595 tokens when it runs. Until then it costs about 48 tokens; SKILL.md has 247 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
The full file from opensage-agent/opensage-adk at commit 54d6470, republished under its Apache-2.0 licence (© opensage-agent). 247 words, ~595 tokens.
Download SKILL.mdSave it as
.claude/skills/multi-model/SKILL.md (or your agent's skills folder).- name
- multi-model
- description
- Recovery strategy when a subagent is stuck on a hard task. Two escape hatches: spawn a fresh-context instance with the same model, or retry with a different model from the registry.
Multi-Model Retry Pattern
A subagent has clearly stalled — repeating the same wrong fix, hallucinating non-existent APIs, or exceeding a step budget. Two ways out: same model + clean history, or a different model.
Usage
3a. Fresh-context retry (same model)
The current subagent's history has accumulated misleading state. A new instance with the same agent_name and same model but no prior context often makes different choices.
new_sid = call_subagent(
agent_name="worker",
request=f"{original_task}\n\nPrevious attempt explored {summary} "
f"and got stuck. Try a different angle.",
mode="sync",
# No model_name → uses the agent's default model.
)3b. Different-model retry
Some tasks fit certain models better — Claude vs GPT-5 differ on long chains, large diffs, MCP-style tool use, etc.
models = get_available_models()
new_sid = call_subagent(
agent_name="worker",
request=original_task,
mode="sync",
model_name=alternate_model, # different from the original
)Combined recipe
- Decide the original is stuck (no progress in N tool calls, or final answer is
complain-shaped). - Try 3a first (cheaper — same model, fresh context). One attempt.
- Still failing → try 3b with each alternate model in
get_available_models(), sync mode, in sequence. - If multiple alternates also fail → emit
complainwith the accumulated evidence. Don't loop forever.
Key points:
- Don't auto-retry on every failure. Distinguish "stuck" from "task genuinely impossible".
complain("no info")is signal, not a bug to retry through. - Cap retries (e.g. ≤2 alternate models). Each retry costs LLM calls.
- For 3b, the new model still has to be in
get_available_models(). If the registry only has one model, only 3a is available.
Common Use Cases
- Single-task subagent has burned its step budget without convergence
- Model-specific regression: one model can't handle a certain syntax, another can
- High-value task where you want to "throw bigger model at it" only after the cheap one fails
Requires Sandbox
None — pure orchestration.
© opensage-agent, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in src/opensage/bash_tools/workflow/multi-model of opensage-agent/opensage-adk.
Open the folder on GitHubat commit 54d6470
Compare with similar skills
Multi Model 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 |
|---|---|---|---|---|---|---|
| Multi Model this skillopensage-agent/opensage-adk | 127 | — | ~595 | Automated safety check: Pass | Apache-2.0 | |
| Claude Code Agent Developmentanthropics/claude-plugins-official | 38k | 8 repos | ~2.8k | Automated safety check: Pass | Apache-2.0 | |
| Subagent Driven DevelopmentAsvarox/allkaraoke | 261 | 38 repos | ~1.2k | Automated safety check: Pass | None | |
| Dispatching Parallel Agentsultralisp/ultralisp | 258 | 41 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 Multi Model
What does Multi Model do?
Recovery strategy when a subagent is stuck on a hard task. An agent skill from opensage-agent/opensage-adk. Multi Model is an agent skill from opensage-agent/opensage-adk. Recovery strategy when a subagent is stuck on a hard task.
When should I use Multi Model?
Multi Model fits situations like: tasks that involve Subagents.
How do I install Multi Model in Claude Code?
Run `npx skills add opensage-agent/opensage-adk --skill multi-model -a claude-code`. Or copy the skill folder (src/opensage/bash_tools/workflow/multi-model in opensage-agent/opensage-adk) into .claude/skills/multi-model in your project. Claude Code loads it when a task matches its description.
How do I install Multi Model in Codex?
Run `npx skills add opensage-agent/opensage-adk --skill multi-model -a codex`. Or copy the skill folder (src/opensage/bash_tools/workflow/multi-model in opensage-agent/opensage-adk) into .agents/skills/multi-model in your project. Codex loads it when a task matches its description.
Can I use Multi Model 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 opensage-agent/opensage-adk --skill multi-model -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/multi-model, .gemini/skills/multi-model, .github/skills/multi-model and .opencode/skills/multi-model in your project.
What does Multi Model need to run?
SKILL.md names no scripts, command-line tools or credentials: Multi Model is instructions for the agent only.
Does Multi Model 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 Multi Model 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 Multi Model use?
Multi Model is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Multi Model use?
About 595 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 Multi Model?
Skills that share tags, products or a category with Multi Model: 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 Multi Model?
opensage-agent (a GitHub organization) maintains it in opensage-agent/opensage-adk, which has 127 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on August 4, 2026.
Source: opensage-agent/opensage-adk on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.