# Write input to a process.

`POST /v1/processes/{id}/input`

Sends data to a process's stdin (pipe mode) or PTY writer (tty mode).
Data can be encoded as base64, utf8, or text. Returns 413 if the decoded
payload exceeds the configured `maxInputBytesPerRequest` limit.

## Parameters

| Name | In | Required | Type | Description |
| --- | --- | --- | --- | --- |
| `id` | path | Yes | string | Process ID |

### Parameter schemas

```json
[
  {
    "name": "id",
    "in": "path",
    "description": "Process ID",
    "required": true,
    "schema": {
      "type": "string"
    }
  }
]
```

## Request body

Required.

### application/json

```json
{
  "schema": {
    "$ref": "#/components/schemas/ProcessInputRequest"
  }
}
```

Related schemas: [ProcessInputRequest](/sandbox-agent/docs/api-reference/schemas/processinputrequest/).

## Responses

### 200

Input accepted

Content type: `application/json`

```json
{
  "schema": {
    "$ref": "#/components/schemas/ProcessInputResponse"
  }
}
```

Related schemas: [ProcessInputResponse](/sandbox-agent/docs/api-reference/schemas/processinputresponse/).

### 400

Invalid request

Content type: `application/json`

```json
{
  "schema": {
    "$ref": "#/components/schemas/ProblemDetails"
  }
}
```

Related schemas: [ProblemDetails](/sandbox-agent/docs/api-reference/schemas/problemdetails/).

### 409

Process not writable

Content type: `application/json`

```json
{
  "schema": {
    "$ref": "#/components/schemas/ProblemDetails"
  }
}
```

Related schemas: [ProblemDetails](/sandbox-agent/docs/api-reference/schemas/problemdetails/).

### 413

Input exceeds configured limit

Content type: `application/json`

```json
{
  "schema": {
    "$ref": "#/components/schemas/ProblemDetails"
  }
}
```

Related schemas: [ProblemDetails](/sandbox-agent/docs/api-reference/schemas/problemdetails/).

### 501

Process API unsupported on this platform

Content type: `application/json`

```json
{
  "schema": {
    "$ref": "#/components/schemas/ProblemDetails"
  }
}
```

Related schemas: [ProblemDetails](/sandbox-agent/docs/api-reference/schemas/problemdetails/).