Compare two Bazel action records.
Paste JSON representations of two actions to find changed fields that may produce different action keys. The comparison runs entirely in your browser; Hermetiq does not upload the pasted data.
Changed fields
arguments[1]Before-O2After-O3environmentVariables.PATHBefore/usr/binAfter/usr/local/bin:/usr/binHow to use the result
Action keys can change when declared inputs, tools, command arguments, environment variables, execution platforms, or other action properties differ. Begin with the first meaningful difference, then trace where that value entered the build configuration.
This general JSON comparison does not calculate Bazel action digests or prove causality. Use it to narrow an investigation, then verify the change against execution logs and your Bazel version.
Technical review: July 20, 2026 · Client-side tool; no pasted data is transmitted by this page.