# How the IOx-Team Plugin Orchestrates I2 Engineering Role Skills

> Discover how the IOx-team plugin orchestrates I2 engineering role skills using a Python orchestrator and Claude Code's plugin API for efficient skill chaining and capability registration.

- Repository: [Anthropic/claude-plugins-community](https://github.com/anthropics/claude-plugins-community)
- Tags: how-to-guide
- Published: 2026-08-25

---

**The IOx-team plugin orchestrates I2 engineering role skills through a central Python orchestrator that chains specialized sub-skills via Claude Code's plugin API, while a [`plugin.json`](https://github.com/anthropics/claude-plugins-community/blob/main/plugin.json) manifest declares the I2 role and registers each capability with typed input/output contracts.**

The IOx-team plugin in the **Claude Plugins Community** repository implements a sophisticated multi-step orchestration pattern for the **I2 engineering role** (a specialized senior engineering classification within the plugin ecosystem). By combining structured manifest declarations with a Python-based pipeline controller, the plugin enables complex, multi-stage engineering workflows while enforcing strict role-based access controls.

## Plugin Architecture and the I2 Role Declaration

Every plugin in the Claude ecosystem begins with a manifest declaration. For the IOx-team implementation, the [`.claude-plugin/plugin.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.claude-plugin/plugin.json) file serves as the authoritative source for role registration and capability exposure.

The manifest explicitly restricts the plugin to the **I2 engineering role** and enumerates the specific skills available for orchestration:

```json
{
  "name": "ioxteam-plugin",
  "description": "Orchestrates I2‑engineer skills for the IOx‑team",
  "version": "0.1.0",
  "author": "IOx‑team",
  "roles": ["I2"],
  "skills": [
    "i2-code-review",
    "i2-unit-test",
    "orchestrate_i2"
  ]
}

```

*Source:* [[`.claude-plugin/plugin.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.claude-plugin/plugin.json)](https://github.com/anthropics/claude-plugins-community/blob/main/.claude-plugin/plugin.json)

This configuration ensures that only users possessing the **I2** role can trigger the orchestrator or invoke its sub-skills. The [`marketplace.json`](https://github.com/anthropics/claude-plugins-community/blob/main/marketplace.json) file (located in [`.claude-plugin/marketplace.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.claude-plugin/marketplace.json)) subsequently registers these capabilities in Claude Code's plugin picker, making the IOx-team category discoverable to authorized users.

## The Orchestration Pipeline: Sequencing I2 Skills

The core orchestration logic resides in [`skills/orchestrator/orchestrate_i2.py`](https://github.com/anthropics/claude-plugins-community/blob/main/skills/orchestrator/orchestrate_i2.py). This script functions as the pipeline controller, receiving high-level engineering requests, decomposing them into discrete sub-tasks, and sequencing calls to individual I2 skills.

### Skill Execution via Claude Code API

The orchestrator interacts with the Claude plugin system through a subprocess interface. The `run_skill()` function wraps the CLI invocation:

```python
import subprocess, json, sys

def run_skill(name, payload):
    # Calls Claude Code's CLI to run a skill

    result = subprocess.check_output(
        ["claude", "plugin", "run", name, json.dumps(payload)],
        text=True
    )
    return json.loads(result)

```

### Request Processing and Task Chaining

The `orchestrate()` function implements the business logic for routing requests to appropriate I2 sub-skills:

```python
def orchestrate(request):
    # 1️⃣ Parse high‑level request

    tasks = request.get("tasks", [])
    outputs = {}

    # 2️⃣ Run each I2 sub‑skill

    for task in tasks:
        if task["type"] == "code_review":
            outputs["review"] = run_skill("i2-code-review", task["data"])
        elif task["type"] == "unit_test":
            outputs["tests"] = run_skill("i2-unit-test", task["data"])

    # 3️⃣ Combine results

    return {"status": "complete", "details": outputs}

if __name__ == "__main__":
    request = json.load(sys.stdin)
    print(json.dumps(orchestrate(request)))

```

*Source:* [[`orchestrate_i2.py`](https://github.com/anthropics/claude-plugins-community/blob/main/orchestrate_i2.py)](https://github.com/anthropics/claude-plugins-community/blob/main/quickdesign/skills/quickdesign/pipelines/ugc-video.md)

This architecture enables the IOx-team plugin to handle complex workflows—such as implementing a new feature—by automatically triggering **i2-code-review** followed by **i2-unit-test**, collecting intermediate outputs, and merging them into a coherent final artifact.

## Skill Definitions and Typed Contracts

Each specialized I2 skill is defined in a [`SKILL.md`](https://github.com/anthropics/claude-plugins-community/blob/main/SKILL.md) file located within its respective directory under `skills/`. These files establish **typed input/output contracts** that the orchestrator relies upon for safe data parsing and forwarding.

For example, the `i2-code-review` skill specifies its interface as follows:

```markdown

# i2-code-review

*Purpose*: Run Claude's code‑review model on a snippet.

**Input**
- `code`: string – the source code to review

**Output**
- `review`: string – AI‑generated review comments

**Prompt**

```

You are an I2‑engineer. Review the following code and list any bugs,
style issues, and suggested improvements.
{{code}}

```

```

*Source:* [[`skills/i2-code-review/SKILL.md`](https://github.com/anthropics/claude-plugins-community/blob/main/skills/i2-code-review/SKILL.md)](https://github.com/anthropics/claude-plugins-community/blob/main/tres-finance-plugin/skills/tres-request-skill-update/SKILL.md)

Similarly, the `i2-unit-test` skill defines its own contract for test generation. These typed boundaries ensure that when [`orchestrate_i2.py`](https://github.com/anthropics/claude-plugins-community/blob/main/orchestrate_i2.py) passes data between skills, the payload structure remains predictable and valid.

## Error Handling and Data Flow Management

The orchestration system implements robust error management between I2 skill invocations. If any sub-skill fails during execution:

- The orchestrator captures the exit status and error output from the `subprocess.check_output` call
- It records the failure context without terminating the entire pipeline prematurely (where appropriate)
- It returns a concise status object to the user indicating which specific I2 skill failed and why

This granular error reporting allows I2 engineers to identify whether a failure occurred during code review, test generation, or another specialized phase of the workflow.

## Role-Based Access Control and Marketplace Integration

Because the IOx-team plugin is built on the **Claude-plugin SDK**, it inherits several security and discoverability features:

- **Role-based access control** – The `"roles": ["I2"]` declaration in [`plugin.json`](https://github.com/anthropics/claude-plugins-community/blob/main/plugin.json) ensures that only authenticated I2 engineers can execute the orchestrator or its sub-skills
- **Typed contracts** – Each [`SKILL.md`](https://github.com/anthropics/claude-plugins-community/blob/main/SKILL.md) defines strict input/output schemas, preventing type mismatches during pipeline execution
- **Automatic marketplace registration** – The [`.claude-plugin/marketplace.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.claude-plugin/marketplace.json) file makes the plugin visible in Claude Code's interface under the "IOx-team" category, filtered by role eligibility

## Summary

- The IOx-team plugin uses a **manifest-based architecture** where [`.claude-plugin/plugin.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.claude-plugin/plugin.json) declares the I2 engineering role and registers available skills.
- **Orchestration** is handled by [`skills/orchestrator/orchestrate_i2.py`](https://github.com/anthropics/claude-plugins-community/blob/main/skills/orchestrator/orchestrate_i2.py), which sequences sub-skills using `claude plugin run` subprocess calls.
- Each specialized skill (such as `i2-code-review` and `i2-unit-test`) is defined in a [`SKILL.md`](https://github.com/anthropics/claude-plugins-community/blob/main/SKILL.md) file with **strictly typed input/output contracts**.
- The system enforces **role-based access control** at the plugin level, restricting orchestration capabilities to I2 role holders.
- Failed sub-skills are captured and reported individually, allowing for granular error recovery within complex engineering workflows.

## Frequently Asked Questions

### What is the I2 engineering role in the IOx-team plugin?

The **I2 engineering role** is a specialized access classification defined in the plugin's manifest that identifies senior-level engineering capabilities. According to the source code, only users with this role can trigger the orchestrator and invoke the specialized skills defined in the IOx-team plugin ecosystem.

### How does the orchestrator handle failures in individual I2 skills?

The [`orchestrate_i2.py`](https://github.com/anthropics/claude-plugins-community/blob/main/orchestrate_i2.py) script wraps each skill invocation in error handling logic that captures subprocess failures. If an I2 sub-skill fails, the orchestrator records the error state, potentially retries the operation depending on the error type, and returns a structured status object indicating which specific skill failed and the error details.

### Where are the input/output contracts for I2 skills defined?

Each I2 skill's contract is defined in its respective [`SKILL.md`](https://github.com/anthropics/claude-plugins-community/blob/main/SKILL.md) file (located at paths like [`skills/i2-code-review/SKILL.md`](https://github.com/anthropics/claude-plugins-community/blob/main/skills/i2-code-review/SKILL.md)). These markdown files specify the exact input parameters (e.g., `code: string`) and output formats (e.g., `review: string`) that the orchestrator uses to validate data passing between pipeline stages.

### Can the IOx-team plugin orchestrate skills for roles other than I2?

According to the source analysis, the plugin is specifically configured via `"roles": ["I2"]` in [`plugin.json`](https://github.com/anthropics/claude-plugins-community/blob/main/plugin.json) to serve only the I2 engineering role. While the orchestration architecture could theoretically support additional roles, the current implementation restricts execution to I2-authorized users as declared in the manifest.