scan-for-secrets 0.1

2026-04-05 · Source: Simon Willison's Weblog · Field: Technology & Digital — Software Development & Engineering, Artificial Intelligence & Machine Learning, Cybersecurity & Data Privacy · Depth: Novice, quick

Summary

The `scan-for-secrets` 0.1 Python tool, released on April 5, 2026, helps users prevent accidental exposure of API keys and other sensitive information when sharing log files or other content. Developed by Simon Willison, the tool scans specified directories for literal secrets provided by the user, such as `$OPENAI_API_KEY`. It also detects common encodings of these secrets, including backslash and JSON escaping. Users can configure a `~/.scan-for-secrets.conf.sh` file to automatically feed a predefined set of secrets from various sources, like `llm keys get openai` or AWS credentials, into the scanning process. The tool was built using a README-driven development approach, with Claude Code assisting in its implementation via red/green TDD.

Key takeaway

For developers or content creators publishing detailed logs or code, you should integrate `scan-for-secrets` into your pre-publication workflow. This tool helps ensure that API keys or other sensitive credentials are not inadvertently exposed, even if they are encoded. Automating this scan with a configuration file will streamline your security checks and reduce the risk of data breaches.

Key insights

The `scan-for-secrets` tool prevents accidental secret exposure by scanning files for literal and encoded keys.

Principles

• Proactive secret scanning prevents data leaks.
• Automate secret detection for consistent security.

Method

Define desired tool behavior in a README, then use an AI assistant (Claude Code) with red/green TDD to implement the tool based on the specification.

In practice

• Scan log files before publishing.
• Configure `~/.scan-for-secrets.conf.sh` for recurring scans.

Topics

• Secret Scanning
• API Key Protection
• Python Security Tool
• README-driven Development
• Claude Code

Code references

• simonw/scan-for-secrets
• simonw/claude-code-transcripts

Best for: Machine Learning Engineer, NLP Engineer, AI Engineer, Software Engineer, AI Security Engineer

Related on AIssential

• scan-for-secrets 0.3 — The `scan-for-secrets` tool now offers both CLI and programmatic secret redaction capabilities.
• Mozart Studio 1.0 — Websites use security services to verify users and protect against malicious bots.
• scan-for-secrets 0.2 — Version 0.2 of `scan-for-secrets` enhances secret detection with streaming results and flexible scanning options.
• Inside the leaked Claude Code files — Accidental code leaks can reveal sensitive AI architecture and unreleased features, prompting rapid community response and copyright challenges.
• GitHub Expands Secret Scanning with General Availability of MCP Server Integration — GitHub's MCP Server integration extends secret scanning to AI-driven workflows, enabling automated credential detection and remediation.
• Type Level Security: The future of secure AI code generation? — Type-level security can eliminate entire classes of web application vulnerabilities by making insecure code uncompilable or un-type-checkable.

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Editorial summary, takeaway, and curation by AIssential. Original article published by Simon Willison's Weblog.