# query

Query an index with sequences and annotate each query with the kmer matches found.

```bash
obikmer query INDEX INPUTS... [OPTIONS]
```

## Arguments

| Argument | Description |
|---|---|
| `INDEX` | Index directory to query against |
| `INPUTS...` | Input sequence files (FASTA/FASTQ, gzip optional); at least one required |

## Options

| Option | Default | Description |
|---|---|---|
| `--detail` | off | Report per-position, per-genome coverage vectors in the output |
| `--count-missing` | off | Also count query kmers absent from the index |
| `--force-presence` | off | Report presence (0/1) per genome instead of raw counts |
| `--presence-threshold` | `1` | Minimum accumulated count to declare a genome present (implies `--force-presence`) |
| `-z, --findere-z` | derived from the index metadata | Override the Findere z parameter |
| `-T, --threads` | detected core count | Number of worker threads |
| `--chunk-size` | auto-sized (available RAM ÷ threads, clamped to 4–256 MiB) | I/O chunk size, in MiB |
| `--max-open-files` | `threads / 4` (min 1) | Maximum number of input files open simultaneously |

## Output

FASTA on stdout, one record per query, annotated in the OBITools-style header format `>id {"key":value,...}`:

- `kmer_count`: total number of kmers matched
- `kmer_missing`: number of query kmers absent from the index (only with `--count-missing`)
- `kmer_strict_matches`: per-genome match counts
- `coverage`: per-position, per-genome coverage vectors (only with `--detail`)

`--mismatch` is accepted by the CLI but not currently functional; using it produces a warning and is ignored.