# CSV trailing record recovery

- Human page: https://happytails.ai/en/data-tools/csv-trailing-record-recovery/
- Markdown: https://happytails.ai/en/data-tools/csv-trailing-record-recovery.md
- Structured JSON: https://happytails.ai/agents/en/data-tools/csv-trailing-record-recovery/index.json
- Visibility: public

## Tool capabilities

| Property | Value |
| --- | --- |
| Tool ID | `csv-trailing-record-recovery` |
| Category | data-tools |
| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |
| Browser execution | Automatic updates after valid input or file selection. |
| Browser processing | Browser; see tool notes for network behavior. |
| HTTP API | Not callable through HTTP. |
| Browser-agent interface | run_current_tool |

### Implementation notes

Runs locally on your device. CSV requires unique nonempty headers. Up to 1,000,000 characters, 10,000 data records and 100,000 cells across inputs, with 100 columns. Quoted multiline cells are supported. Each JSON settings field is limited to 100,000 characters. Output files are bounded to 4,000,000 characters. Diagnostic reports contain at most 500 findings and disclose the omitted count. Recover preceding complete records only when the final unterminated record has an unclosed quoted cell or too few fields. Download the recovered CSV and loss report. Interior damage, extra fields and terminated malformed rows are rejected. A syntactically complete but truncated final value cannot be detected. Protect spreadsheet cells prefixes formula-like values, including negative numbers, with an apostrophe. Choose Preserve original cells only for a trusted import workflow.

### Inputs and settings

Text input: CSV data.

Example or placeholder shown in the interface (not a validated fixture):

```text
id,name
1,Alice
2,"Bob
```

Paste CSV data with unique column headers. Quoted multiline cells are supported. Results update as you type. Up to 1,000,000 characters.

| Setting | Meaning | Control type | Default | Constraints |
| --- | --- | --- | --- | --- |
| `separator` | Input CSV separator | select | "," | Allowed: ,, ;, 	 |
| `outputSafety` | CSV output cells | select | "Protect spreadsheet cells" | Allowed: Protect spreadsheet cells, Preserve original cells |

### Browser-agent workflow

1. Open the human page in a browser that supports WebMCP.
2. Discover the interface exposed by that page; use its actual schema.
3. Select files on the page first when the tool requires files.
4. Call `run_current_tool` with valid input and settings.
5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.

Calls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.

### Planning specification

Only the final unterminated record can be discarded, when it has an unclosed quoted field or too few columns. Malformed interior rows and extra columns are rejected. Syntactically complete but truncated values cannot be detected. Up to 1,000,000 characters, 10,000 data records, 100 columns and 100,000 cells across the sources. Files for multi-source tools are limited to 4,000,000 bytes total. Reports retain at most 500 diagnostic findings and state any omitted count. CSV and JSON outputs are limited to 4,000,000 characters.

This describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.

### Complete machine-readable capability record

```json
{
  "id": "csv-trailing-record-recovery",
  "category": "data-tools",
  "built": true,
  "requirements": "Only the final unterminated record can be discarded, when it has an unclosed quoted field or too few columns. Malformed interior rows and extra columns are rejected. Syntactically complete but truncated values cannot be detected. Up to 1,000,000 characters, 10,000 data records, 100 columns and 100,000 cells across the sources. Files for multi-source tools are limited to 4,000,000 bytes total. Reports retain at most 500 diagnostic findings and state any omitted count. CSV and JSON outputs are limited to 4,000,000 characters.",
  "implementation": {
    "fields": [
      {
        "key": "separator",
        "label": "Input CSV separator",
        "value": ",",
        "type": "select",
        "values": [
          ",",
          ";",
          "\t"
        ]
      },
      {
        "key": "outputSafety",
        "label": "CSV output cells",
        "value": "Protect spreadsheet cells",
        "type": "select",
        "values": [
          "Protect spreadsheet cells",
          "Preserve original cells"
        ]
      }
    ],
    "live": true,
    "presentation": "metrics",
    "note": "Runs locally on your device. CSV requires unique nonempty headers. Up to 1,000,000 characters, 10,000 data records and 100,000 cells across inputs, with 100 columns. Quoted multiline cells are supported. Each JSON settings field is limited to 100,000 characters. Output files are bounded to 4,000,000 characters. Diagnostic reports contain at most 500 findings and disclose the omitted count. Recover preceding complete records only when the final unterminated record has an unclosed quoted cell or too few fields. Download the recovered CSV and loss report. Interior damage, extra fields and terminated malformed rows are rejected. A syntactically complete but truncated final value cannot be detected. Protect spreadsheet cells prefixes formula-like values, including negative numbers, with an apostrophe. Choose Preserve original cells only for a trusted import workflow.",
    "experience": {
      "automatic": true,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "CSV data",
      "placeholder": "id,name\n1,Alice\n2,\"Bob",
      "help": "Paste CSV data with unique column headers. Quoted multiline cells are supported. Results update as you type. Up to 1,000,000 characters.",
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}
```

## Page guide

Recover complete CSV records from an export with an incomplete final row.

How can we improve this tool?

Report a problem or share an idea.

Please leave out private information. Your message and the tool name go to our team via PostHog.

### How to use CSV trailing record recovery

1. Paste the truncated CSV text.
2. Review the count of complete records and the discarded-tail report.
3. Download the recovered CSV and keep the original for reference.

## Useful next steps

- [CSV schema validator](https://happytails.ai/en/data-tools/csv-schema-validator/) ([Markdown](https://happytails.ai/en/data-tools/csv-schema-validator.md))

- [CSV type profiler](https://happytails.ai/en/data-tools/csv-type-profiler/) ([Markdown](https://happytails.ai/en/data-tools/csv-type-profiler.md))

## Prepare the source

Paste the truncated CSV text.

### Choose the matching rules

Review the count of complete records and the discarded-tail report.

### Review and keep the result

Download the recovered CSV and keep the original for reference. Only the final unterminated record can be discarded, when it has an unclosed quoted field or too few columns. Malformed interior rows and extra columns are rejected. Syntactically complete but truncated values cannot be detected.