# `once query evidence`

List durable evidence records, optionally filtered by subject

## Synopsis

```text
once query evidence [OPTIONS] [SUBJECT]
```

## Description

Evidence records are provenance for action outcomes. They record what happened after `once exec`, `once run`, `once build`, `once lint`, or `once test`: the subject, status, action digest, input digest when available, an input fingerprint manifest for declared graph actions, cache state, exit code, and captured output digests when available. Fingerprint components expose only their category, label, and digest, not raw command or environment values. Evidence is queryable history; it does not change action-cache reuse rules.

## Arguments

| Argument | Required | Description |
| --- | --- | --- |
| `<SUBJECT>` | no | Subject id, e.g. `cli` or `cli:test` |

## Options

| Flag | Value | Default | Description |
| --- | --- | --- | --- |
| `--limit` | `<COUNT>` |  | Return only the newest matching records |
| `-C, --directory` | `<DIR>` |  | Project root. Defaults to the current directory; the cache lives under `<project>/.once/`. Mirrors `make -C` |
| `--format` | `<FORMAT>` | `human` | Output format for Once's structured data (`cache stats`, `run`/`exec` trailers). Defaults to a human-readable rendering; pass `json` or `toon` to get machine-parseable output for scripting and for agent consumers |
| `-v, --verbose` | (flag) | `0` | Increase log verbosity. Repeat for more (-v: info, -vv: debug, -vvv: trace). Overridden by `RUST_LOG` |
| `-q, --quiet` | (flag) | `false` | Suppress human-mode success and progress trailers. Errors and the structured envelope of `--format json`/`toon` still print. Mirrors the `-q` flag of common build tools |
| `--list` | (flag) | `false` | Print the command surface at the current command depth |
| `--memory-limit` | `<SIZE>` |  | Maximum memory scheduling budget for local actions. Defaults to two thirds of the memory visible to the host or container |