CSP testing for coding agent web changes

Content Security Policy (CSP) testing helps ensure web pages load authorized resources while blocking unapproved scripts, frames, styles, workers, and other content, particularly when coding agents introduce changes that may conflict with existing security rules. Effective testing begins by documenting policies across representative routes and identifying the narrowest relevant directive rather than broadly relaxing default settings, while keeping development allowances separate from production policies. Tests should verify both permitted resources and deliberately blocked controls in the browser, with special attention to nonce-based inline scripts, authentication and error pages, and the combined effects of headers from applications, proxies, and content delivery networks. Teams can constrain coding-agent tasks by specifying the affected route, resource type, approved host, and evidence requirements, avoiding unsafe wildcards or unscoped global configuration changes. Final reviews should preserve response-header and browser-test evidence, protect sensitive data, and use report-only deployments with an observation period when telemetry is needed before enforcement, repeating checks after infrastructure configuration changes.

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