Create Plugin

Create OIAP Plugin

Use this skill when the user needs to write an agent plugin in TypeScript using OIAP.

OIAP lets plugin authors define a plugin once and export host-native bundles for multiple agent platforms. Treat OIAP as an external SDK and CLI unless the user is explicitly working inside the OIAP source repository.

First Response

Start by identifying the plugin shape the user wants:

• What should the plugin help an agent do?
• Which targets matter first, such as claude-code, codex, cursor,

openclaw, vscode-copilot-chat, or antigravity?

• Does the plugin need commands, always-on instructions, skills, hooks, agents,

MCP tools, executable recipes, or policies?

• Should generated bundles be committed, published, or only built locally for

review?

If the request is already clear, do not over-interview. Scaffold the smallest useful plugin and explain where to extend it.

Install OIAP

For normal plugin projects, use the published OIAP CLI and SDK.

Use the existing project package manager in commands and examples. If the project already uses bun, pnpm, yarn, or npm, follow that choice instead of switching tools. Only fall back to npm when the project has no clear package manager yet.

Install the OIAP packages with that package manager. For example:

# npm
npm install --save-dev @oiap/cli @oiap/core

# pnpm
pnpm add -D @oiap/cli @oiap/core

# yarn
yarn add --dev @oiap/cli @oiap/core

# bun
bun add --dev @oiap/cli @oiap/core

Use npx oiap in examples and instructions:

npx oiap targets
npx oiap build oiap.plugin.ts --target claude-code --out dist/claude-code
npx oiap build oiap.plugin.ts --out dist/oiap

Do not tell users to clone the OIAP repository unless they are contributing to OIAP itself.

Authoring Rules

• Create an oiap.plugin.ts file that exports definePlugin(...) as the

default export.

• Import from @oiap/core; avoid repository-relative imports.
• Put larger prompts and agent instructions in Markdown files and load them with

markdownFile("path.md", { baseUrl: import.meta.url }).

• Keep target-specific overrides small. Prefer portable primitives first.
• Declare supportedTargets honestly. Use only targets the user wants to build

or verify.

• Include policies when hooks, tools, scripts, network access, file writes,

secrets, or destructive actions are involved.

• Build target bundles into dist/ and tell the user that OIAP generates

artifacts; installing those artifacts into a host is handled by the host or the user's own workflow.

Project Shape

Use this default layout for a new plugin:

my-plugin/
  package.json
  tsconfig.json
  oiap.plugin.ts
  prompts/
    command.md

Add only the folders needed by the plugin:

agents/       Custom agent instruction Markdown
prompts/      Command, skill, workflow, and safety prompts
schemas/      JSON schemas for invocation or tool arguments
recipes/      Executable command recipe source files
policies/     Permission and safety policy helpers

Workflow

1. Decide the plugin intent and target platforms.
2. Choose the smallest primitive set that represents the behavior.
3. Create or update package.json, tsconfig.json, oiap.plugin.ts, and any

prompt Markdown files.

1. Run npx oiap targets so the user can see available exporters.
2. Build at least one requested target with npx oiap build.
3. Review generated capability reports and mention any degraded or unsupported

capabilities.

Primitive Selection

Use this mapping when deciding what to create:

| User need | OIAP primitive | | --- | --- | | Slash command or named action | invocations, instructions, commands | | Reusable prompt bundle | instructions, skills | | Always-on repository guidance | rules or always-on instructions | | Pre/post lifecycle behavior | hooks | | Specialized worker persona | agents plus agent instructions | | External tools or MCP server | tools | | Scripted shell operation | recipes and runtimeModules when needed | | Permissions or safety posture | policies |

References

Read [references/plugin-patterns.md](references/plugin-patterns.md) when you need copyable OIAP examples for command plugins, hook plugins, agent plugins, or policies.

Output Style

When you create files, summarize:

• The plugin behavior.
• The primitives used.
• The build command to generate bundles.
• Any target-specific limitations or policies the user should review.

Keep explanations focused on the user's plugin, not on OIAP internals.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: fboldo
• Source: fboldo/oiap
• License: MIT

Install and usage instructions live in the source repository linked above.