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secret-serialization

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Finds secrets, tokens, passwords, and API keys that can leak through generated serialization: Python dataclass repr and asdict, attrs, pydantic model_dump, NamedTuple, JavaScript JSON.stringify and util.inspect, structured logs, tracing spans, and error reports. Use when asked to "check for secret serialization", "credential in repr", "repr=False audit", "secret in spans", "token in logs", or when a change adds a credential field to a dataclass, model, or config object, or adds code that stringifies whole objects or every kwarg into telemetry.

skills/secret-serialization/SKILL.md

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Observed behavior
Network or broad shell
Last checked
Nov 10, 2026

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1,139
Repository last updated
Nov 5, 2026
License
Apache-2.0

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# Secret Serialization Review

Find credentials that can leak because a type serializes itself and something upstream serializes whole objects.

A leak usually needs two changes that each look safe alone:

1. **Holder**: a credential is stored as a field on a type with generated `repr`, `str`, `asdict`, `model_dump`, `toJSON`, or property enumeration.
2. **Sink**: logging, tracing, error reporting, caching, or a response serializes whole objects or every kwarg (`str(value)`, `span.set_data(key, obj)`, `logger.info("%s", obj)`, `JSON.stringify(args)`).

The two sides are often written months apart by different authors. Report either side on its own. Always search the existing tree for the other side, because it is frequently already on the default branch and absent from the diff.

## Boundary

- This skill covers indirect leaks through generated serialization and wholesale sinks.
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