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[codex] document new list evaluator match modes #34

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lan17 merged 1 commit into from
Apr 1, 2026
Merged

[codex] document new list evaluator match modes #34

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27 changes: 26 additions & 1 deletion concepts/evaluators/built-in-evaluators.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -79,13 +79,17 @@ Flexible value matching with multiple modes and logic options.
| `values` | list | required | Values to match against |
| `logic` | string | `"any"` | `"any"` = match any value, `"all"` = match all |
| `match_on` | string | `"match"` | `"match"` = trigger when found, `"no_match"` = trigger when NOT found |
| `match_mode` | string | `"exact"` | `"exact"` = full string match, `"contains"` = word-boundary match |
| `match_mode` | string | `"exact"` | `"exact"` = full string match, `"contains"` = word-boundary match, `"starts_with"` = prefix match, `"ends_with"` = suffix match |
| `case_sensitive` | bool | `false` | Case sensitivity |

<Note>
`match_mode="contains"` uses word-boundary matching, not generic substring matching. For example, `"admin"` will match `"admin user"` but will NOT match `"sysadministrator"`.
</Note>

<Note>
`match_mode="starts_with"` and `match_mode="ends_with"` use literal string prefix/suffix matching. They are not path-boundary aware, so `"/safe"` will also match `"/safezone"` when using `starts_with`.
</Note>

<Accordion title="Examples">

```json
Expand All @@ -110,6 +114,27 @@ Flexible value matching with multiple modes and logic options.
}
}

// Allowlist: only permit writes under approved prefixes
{
"name": "list",
"config": {
"values": ["/workspace/", "/tmp/scratch/"],
"match_on": "no_match",
"match_mode": "starts_with",
"logic": "any"
}
}

// Block file types by suffix
{
"name": "list",
"config": {
"values": [".env", ".pem", ".key"],
"match_mode": "ends_with",
"logic": "any"
}
}

// Allowlist: only permit specific tools
{
"name": "list",
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