[Bug] Anthropic API Error: False positive content filter block on benign input "Hi"

**Bug Description**
False positive. Model: Opus 4.6. Request ID: req_011CedxX1hhX7jwgZrLUbVd7. Flag: [cyber].

The only message I sent was “Hi”. No exploit, malware, ransomware, or attack tooling. Please review and clear this block.

**Environment Info**
- Platform: win32
- Terminal: windows-terminal
- Version: 2.1.258
- Feedback ID: 259af159-0a16-491e-ac81-b2e4ea357e77

**Errors**
```json
[]
```

Start by reviewing the reported model, request ID, feedback ID, platform, and the exact benign input “Hi”. Determine whether the block is reproducible and whether it comes from Claude Code or the Anthropic API; done means identifying the source and confirming a fix or an upstream resolution.

索引モデルが issue の本文から書いたものです。