> ## Documentation Index
> Fetch the complete documentation index at: https://codexceed.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# avatar.verifier

Verifier — proves completion via external evidence, never self-certification (§12).

It runs **no model**: every check is a predicate over structured `TaskState` plus
the workspace. For `edit`/`test_only` the *external signal* is the task's frozen
**verification plan** (ADR-0007) — commands the harness resolved (config override →
deterministic detection → cited LLM proposal) and froze onto `TaskState` before
editing began. The verifier is a **pure executor** over that plan: zero language
knowledge, it runs each frozen command itself via `ws.run` and reads the real exit
code. The gate is harness-owned, so the model can never self-certify (§5). The
three pass criteria (§12): no required check fails; no required check is skipped
for a disallowed reason; at least one positive signal.

When no plan was frozen (a direct library call), the config override tier alone
is used as the plan — never a detected or invented default.

## Classes

### `Verifier`

Disposes of a completion proposal via external evidence, never a model (§12).

Args:
config: The harness config; its `test_command`/`lint_command` override tier
doubles as the plan when no frozen plan exists. `None` leaves both empty.

```python theme={null}
Verifier(config: HarnessConfig | None = None) -> None
```

#### `Verifier.verify(self, state: TaskState, ws: Workspace) -> VerifierResult`

Run the verification contract for the task's `task_kind` (§12).

Args:
state: The task state.
ws: The run-scoped workspace.

Returns:
The disposition over the contract's checks.

Raises:
NotImplementedError: For an unrecognized `task_kind`.