# Sequence invert hunks

`sequence-invert-hunks` · version 1.0.0 · Sequences & diffs · free, no key needed

Invert sequence hunks by swapping delete/insert and old/new counts.

**Use when you need to: sequence invert hunks · invert sequence diff hunks · reverse sequence hunks.**

## Supported

- sequence invert hunks
- invert sequence diff hunks
- reverse sequence hunks

## Not supported

- fuzzy matching
- offset search
- unified text invert
- RFC 6902 JSON Patch

## Behavior

- Input hunks have keys old_start, old_count, new_start, new_count, and ops. Extra keys are rejected.
- Inversion swaps delete with insert and old_* with new_*. keep ops stay keep.
- Every hunk op.value must be a sequence item. Line records and other objects are rejected.
- Op values are copied. Empty hunks invert to empty hunks.
- The context-0 hunk that deletes B and inserts X inverts to delete X and insert B with swapped starts.
- Unknown input fields are rejected.

## Input

- `hunks` (array of any, required): max items 1024

## Output

- `hunks` (array of any, required): max items 1024

## Limits

- max hunks: 1024
- max output bytes: 1048576

## Example

Request input:

```json
{
  "hunks": [
    {
      "old_start": 1,
      "old_count": 1,
      "new_start": 1,
      "new_count": 1,
      "ops": [
        {
          "op": "delete",
          "value": "B"
        },
        {
          "op": "insert",
          "value": "X"
        }
      ]
    }
  ]
}
```

Response:

```json
{
  "result": {
    "hunks": [
      {
        "old_start": 1,
        "old_count": 1,
        "new_start": 1,
        "new_count": 1,
        "ops": [
          {
            "op": "insert",
            "value": "B"
          },
          {
            "op": "delete",
            "value": "X"
          }
        ]
      }
    ]
  }
}
```

## How to call it

### MCP

Connect `https://computefirst.net/mcp` ([setup](/docs#connect)), then call `execute` with:

```json
{
  "id": "sequence-invert-hunks",
  "version": "1.0.0",
  "input": {
    "hunks": [
      {
        "old_start": 1,
        "old_count": 1,
        "new_start": 1,
        "new_count": 1,
        "ops": [
          {
            "op": "delete",
            "value": "B"
          },
          {
            "op": "insert",
            "value": "X"
          }
        ]
      }
    ]
  }
}
```

### HTTP (no key)

```sh
curl -X POST https://computefirst.net/v1/tools/sequence-invert-hunks/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"hunks":[{"old_start":1,"old_count":1,"new_start":1,"new_count":1,"ops":[{"op":"delete","value":"B"},{"op":"insert","value":"X"}]}]}'
```

The machine-readable contract is at [/v1/tools/sequence-invert-hunks/versions/1.0.0](/v1/tools/sequence-invert-hunks/versions/1.0.0).

### CLI

```sh
node cli.mjs run sequence-invert-hunks 1.0.0 --input input.json --base-url https://computefirst.net
```

Get the client at [/clients/cli/](/clients/cli/).

## Related tools

- [Sequence apply hunks](/tools/sequence-apply-hunks): Apply disjoint original-address sequence hunks with exact context and no fuzz.
- [Sequence diff hunks](/tools/sequence-diff-hunks): Group a Myers sequence edit script into context hunks with 0-based original addresses.
- [Sequence apply edit script](/tools/sequence-apply-edit-script): Apply a keep/delete/insert edit script to a bounded sequence with exact value matching and no fuzz.
- [Sequence compose edit scripts](/tools/sequence-compose-edit-scripts): Compose two sequence edit scripts into one per-item keep/delete/insert script.
- [Sequence edit script](/tools/sequence-edit-script): Compute the Myers shortest edit script between two bounded sequences, with keep/delete/insert counts.
- [Sequence index map](/tools/sequence-index-map): Map each left-sequence index to a kept right index, or null if deleted, and list inserted right indices.