The assistant mixed several compatibility shapes:

[TOOL_CALL]{bad[/TOOL_CALL]
[TOOL_CALL]{"name":"calculator","arguments":{"expression":"1 + 1"}}[/TOOL_CALL]

<tool_code>{bad</tool_code>
<tool_code>database.run({"sql":"SELECT 1"})</tool_code>

<invoke name="broken"><parameter>missing name</parameter></invoke>
<invoke name="search"><parameter name="query">avalan docs</parameter></invoke>

```json
{bad
```

```json
{"name":"browser.open","arguments":{"url":"https://example.invalid"}}
```
