Proving Agentic Test Runs With .evidence [Testμ 2026]

At Testμ Conf 2026, TestMu AI product manager Anubhav Singhmaar presented .evidence, an open, versioned archive format intended to preserve complete test-run records rather than only pass/fail statuses and stack traces. Each sealed pack includes a minimal core layer containing a run manifest, the original test definition, and structured step results, while optional captured data can include screenshots, logs, network traffic, coverage, failure records, and agent trajectories; test files are stored and hashed without being parsed, allowing validators to detect later modifications while remaining framework-neutral. The open-source reference implementation, licensed under Apache 2.0 according to the presentation, finalizes, validates, and merges packs, with validation designed for offline automated CI gating through standard exit codes. Singhmaar argued that the format addresses fragmented reporting integrations, mutable AI-generated tests, and the loss of historical evidence caused by expiring logs and changing dashboards, distinguishing test reports as claims from portable records as proof. Kane CLI was described as the first producer of the format, adding rich per-step browser, environment, and agent data and offering a proprietary viewer, while the talk did not identify external producers, independent adopters, or third-party validation of the format’s claims.

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