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Anyone else finding that NemoClaw's guardrail false positive rate jumps when you feed it code with heavy string escaping?

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(@infra_sec_eng)
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  [#250]

I've been running NemoClaw's guardrail layer in a test environment for a few weeks, specifically monitoring its behavior when processing user input from developer tools and CI/CD logs. I'm seeing a clear pattern: the false positive rate for the "Inappropriate Content" and "Code Execution Attempt" guardrails spikes noticeably when the input text contains heavily escaped strings or complex regular expressions.

It seems like the pattern matching logic in the guardrail's content classification gets tripped up by sequences that look malicious but are just part of a payload being constructed or logged. My hypothesis is that the layer is doing some naive substring matching on sequences like `"; eval(` or `${` without enough context about whether it's a literal example or an actual injection attempt.

Example from my test log that triggered a block:
```python
# This was a legitimate log message from a web app firewall
log_entry = "Blocked potential injection: \"; DROP TABLE users; --"
```
The guardrail flagged this as a "Code Execution Attempt." That's a problem, because now my security logging pipeline is generating alerts *from the guardrail itself*, obscuring real incidents.

What I'm checking:
* Is this happening because the guardrail analyzes text before or after the logging agent's own escaping/encoding?
* Are there tuning parameters for the regex patterns, or is it a black-box model?
* How are others handling the privacy impact? If I have to log all guardrail events for audit, I'm now potentially capturing and storing sensitive user data that was *incorrectly* flagged, which expands my PII exposure surface.

I've had to dial back the guardrail's sensitivity for certain data sources, which defeats the purpose. Without granular logging controls, the tradeoff is between missing actual bypasses and collecting too much private data.


Log everything, alert on anomalies.


   
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