Ready to supercharge your AI agents?

Install any skill in seconds. Free to start, no credit card required.

Get Started Free →

Create Cowork Plugin · minicoohei | DecimalAI

agent toolingby minicoohei

Create Cowork Plugin

minicoohei/create-cowork-plugin

Source minicoohei/ai-agent-camp ↗License Not recorded

Cowork セッションでプラグインをゼロから作成するスキル。「プラグインを作って」「プラグイン開発」「plugin作成」等のリクエストで発動。 Cowork モードで .plugin ファイルを生成。

SkillScore86Maintained

Automatic

AI Engineer pack

Last verified 8/21/2026

What it changes

Passed 19 of 22 test cases with the skill, and 10 of 22 without it.

Without skill45%

With skill86%

Checks it passed that the model alone missed

The response specifies hooks/hooks.json.
The response specifies claude plugin validate.
The response names the output file log-analyzer.plugin.

and 8 more in the full report

10 fixed9 passed either way2 still failing1 broke

Pass-rate lift: +41 pp
Tokens: +95%
Agent turns: 0%
Response time: -57%

Model gemini-3.6-flashMeasured 8/21/2026v119 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/minicoohei-create-cowork-plugin/SKILL.md https://app.decimal.ai/s/minicoohei-create-cowork-plugin/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add minicoohei-create-cowork-plugin, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/minicoohei-create-cowork-plugin/ and pins it in .decimal/skills.lock

decimalai skills add minicoohei-create-cowork-plugin

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/minicoohei-create-cowork-plugin/SKILL.md https://app.decimal.ai/s/minicoohei-create-cowork-plugin/SKILL.md

Raw file: /s/minicoohei-create-cowork-plugin/SKILL.md ↗ · machine-readable summary at /s/minicoohei-create-cowork-plugin.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 10 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 10

Prompt

I am putting together a Cowork extension manifest for a team utility called team-helper. Which directory relative to the plugin root must contain the plugin configuration file, and what is its minimum required root field?

What was checked, without and with the skill
Checked	Without skill	With skill
The response identifies the manifest path as .claude-plugin/plugin.json.	Missed	Passed
The response states that name is the minimal required field.	Passed	Passed

case-04 · gemini-3.6-flash · 8/21/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md253 lines3 files

Create Cowork Plugin

Build a new plugin from scratch through guided conversation. Walk the user through discovery, planning, design, implementation, and packaging — delivering a ready-to-install .plugin file at the end.

Overview

A plugin is a self-contained directory that extends Claude's capabilities with commands, skills, agents, hooks, and MCP server integrations. This skill encodes the full plugin architecture and a five-phase workflow for creating one conversationally.

The process:

Discovery — understand what the user wants to build
Component Planning — determine which component types are needed
Design & Clarifying Questions — specify each component in detail
Implementation — create all plugin files
Review & Package — deliver the .plugin file

Nontechnical output: Keep all user-facing conversation in plain language. Do not expose implementation details like file paths, directory structures, or schema fields unless the user asks. Frame everything in terms of what the plugin will do.

Plugin Architecture

Directory Structure

Every plugin follows this layout:

plugin-name/
├── .claude-plugin/
│   └── plugin.json           # Required: plugin manifest
├── commands/                 # Slash commands (.md files)
├── agents/                   # Subagent definitions (.md files)
├── skills/                   # Skills (subdirectories with SKILL.md)
│   └── skill-name/
│       ├── SKILL.md
│       └── references/
├── .mcp.json                 # MCP server definitions
└── README.md                 # Plugin documentation

Rules:

.claude-plugin/plugin.json is always required

Track record

Benchmark

19 / 22

test cases passed, vs 10 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

minicoohei / ai-agent-camp

skills/create-cowork-plugin/SKILL.md

View on GitHub ↗

Imported 8/3/2026Version v1Bundled 2 files

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Create Cowork Plugin

Overview

Plugin Architecture

Directory Structure

Track record

Benchmark

Adoption

SkillSafety

Source

Related skills