> ## Documentation Index
> Fetch the complete documentation index at: https://docs.osmedeus.org/llms.txt
> Use this file to discover all available pages before exploring further.

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# Adding Step Types

Add custom step executors to extend workflow capabilities.

## Overview

Step types are handlers that execute specific step configurations. Each type has a dedicated executor in `internal/executor/`.

## Steps to Add a New Step Type

### 1. Define the Type Constant

Add to `internal/core/types.go`:

```go  theme={null}
// StepType represents the type of step
type StepType string

const (
    StepTypeBash          StepType = "bash"
    StepTypeFunction      StepType = "function"
    StepTypeForeach       StepType = "foreach"
    StepTypeParallelSteps StepType = "parallel-steps"
    StepTypeRemoteBash    StepType = "remote-bash"
    StepTypeHTTP          StepType = "http"
    StepTypeLLM           StepType = "llm"
    StepTypeMyNew         StepType = "mynew"  // Add your new type
)
```

### 2. Add Step Fields (if needed)

Add fields to `internal/core/step.go`:

```go  theme={null}
type Step struct {
    // Existing fields...

    // New fields for your step type
    MyNewField     string            `yaml:"my_new_field,omitempty"`
    MyNewConfig    *MyNewConfig      `yaml:"my_new_config,omitempty"`
}

type MyNewConfig struct {
    Option1 string `yaml:"option1,omitempty"`
    Option2 int    `yaml:"option2,omitempty"`
}
```

### 3. Create the Executor

Create `internal/executor/mynew_executor.go`:

```go  theme={null}
package executor

import (
    "context"

    "github.com/osmedeus/osmedeus-ng/internal/core"
    "github.com/osmedeus/osmedeus-ng/internal/template"
)

type MyNewExecutor struct {
    templateEngine *template.Engine
}

func NewMyNewExecutor(templateEngine *template.Engine) *MyNewExecutor {
    return &MyNewExecutor{
        templateEngine: templateEngine,
    }
}

func (e *MyNewExecutor) Execute(
    ctx context.Context,
    step *core.Step,
    execCtx *core.ExecutionContext,
) (*core.StepResult, error) {
    // 1. Render templates in step fields
    renderedField, err := e.templateEngine.Render(step.MyNewField, execCtx.Variables)
    if err != nil {
        return nil, fmt.Errorf("template render failed: %w", err)
    }

    // 2. Perform your step logic
    output, err := e.doSomething(ctx, renderedField, step.MyNewConfig)
    if err != nil {
        return &core.StepResult{
            Success: false,
            Error:   err,
        }, nil
    }

    // 3. Return result
    return &core.StepResult{
        Success: true,
        Output:  output,
    }, nil
}

func (e *MyNewExecutor) doSomething(
    ctx context.Context,
    field string,
    config *core.MyNewConfig,
) (string, error) {
    // Implementation here
    return "result", nil
}
```

### 4. Register in Dispatcher

Update `internal/executor/dispatcher.go`:

```go  theme={null}
type StepDispatcher struct {
    bashExecutor       *BashExecutor
    functionExecutor   *FunctionExecutor
    foreachExecutor    *ForeachExecutor
    parallelExecutor   *ParallelExecutor
    remoteBashExecutor *RemoteBashExecutor
    httpExecutor       *HTTPExecutor
    llmExecutor        *LLMExecutor
    myNewExecutor      *MyNewExecutor  // Add your executor
    runner             runner.Runner
}

func NewStepDispatcher(
    templateEngine *template.Engine,
    functionRegistry *functions.Registry,
    runner runner.Runner,
) *StepDispatcher {
    return &StepDispatcher{
        // Existing executors...
        myNewExecutor: NewMyNewExecutor(templateEngine),
        runner:        runner,
    }
}

func (d *StepDispatcher) Dispatch(
    ctx context.Context,
    step *core.Step,
    execCtx *core.ExecutionContext,
) (*core.StepResult, error) {
    switch step.Type {
    case core.StepTypeBash:
        return d.bashExecutor.Execute(ctx, step, execCtx, d.runner)
    // ... other cases ...
    case core.StepTypeMyNew:
        return d.myNewExecutor.Execute(ctx, step, execCtx)
    default:
        return nil, fmt.Errorf("unknown step type: %s", step.Type)
    }
}
```

### 5. Add Validation

Update `internal/parser/validator.go`:

```go  theme={null}
func (v *Validator) validateStep(step *core.Step) error {
    switch step.Type {
    // ... existing cases ...
    case core.StepTypeMyNew:
        return v.validateMyNewStep(step)
    }
    return nil
}

func (v *Validator) validateMyNewStep(step *core.Step) error {
    if step.MyNewField == "" {
        return fmt.Errorf("step '%s': my_new_field is required for mynew step type", step.Name)
    }
    return nil
}
```

### 6. Write Tests

Create `internal/executor/mynew_executor_test.go`:

```go  theme={null}
package executor

import (
    "context"
    "testing"

    "github.com/osmedeus/osmedeus-ng/internal/core"
    "github.com/osmedeus/osmedeus-ng/internal/template"
    "github.com/stretchr/testify/assert"
    "github.com/stretchr/testify/require"
)

func TestMyNewExecutor_Execute(t *testing.T) {
    engine := template.NewEngine()
    executor := NewMyNewExecutor(engine)

    step := &core.Step{
        Name:       "test-step",
        Type:       core.StepTypeMyNew,
        MyNewField: "test-value",
    }

    execCtx := &core.ExecutionContext{
        Variables: map[string]interface{}{
            "target": "example.com",
        },
    }

    result, err := executor.Execute(context.Background(), step, execCtx)

    require.NoError(t, err)
    assert.True(t, result.Success)
    assert.NotEmpty(t, result.Output)
}
```

## Example: Custom Notification Step

```go  theme={null}
// internal/executor/notify_executor.go

type NotifyExecutor struct {
    templateEngine *template.Engine
}

func (e *NotifyExecutor) Execute(
    ctx context.Context,
    step *core.Step,
    execCtx *core.ExecutionContext,
) (*core.StepResult, error) {
    // Render message template
    message, err := e.templateEngine.Render(step.NotifyMessage, execCtx.Variables)
    if err != nil {
        return nil, err
    }

    // Send notification based on channel
    switch step.NotifyChannel {
    case "slack":
        err = e.sendSlack(ctx, step.NotifyConfig.WebhookURL, message)
    case "discord":
        err = e.sendDiscord(ctx, step.NotifyConfig.WebhookURL, message)
    case "telegram":
        err = e.sendTelegram(ctx, step.NotifyConfig, message)
    }

    if err != nil {
        return &core.StepResult{Success: false, Error: err}, nil
    }

    return &core.StepResult{Success: true, Output: "Notification sent"}, nil
}
```

Usage in workflow:

```yaml  theme={null}
- name: notify-complete
  type: notify
  notify_channel: slack
  notify_message: "Scan completed for {{target}}"
  notify_config:
    webhook_url: "{{slack_webhook}}"
```

## Best Practices

1. **Always render templates** before using step fields
2. **Support context cancellation** via `ctx.Done()`
3. **Return meaningful errors** with context
4. **Export useful values** via StepResult
5. **Write comprehensive tests**
6. **Add validation rules** for required fields

## Next Steps

* [Adding Runners](runners.md) - Custom execution environments
* [Adding Functions](functions.md) - Utility functions
* [Architecture](../concepts/architecture.md) - System overview


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