Private diagnostic collection

Collect only the evidence that separates one layer from the next

One environment: same surface, workspace/account, OS, and session.
One order: last explicit success → first explicit failure.
One bounded test: read-only or reversible where possible.
Version boundary: previous/current only when the issue changed after update.
Small excerpt: no entire transcripts, config trees, or source repositories.

Nothing on this page executes a capability, reads your device, or uploads a file automatically. Build the bundle locally, inspect it, then return only a sanitized excerpt.

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Local bundle builder

Fill what you know. This produces a JSON file in your browser; it is not sent to the server.

Codex surface Operating system Recent change Codex/host version Capability/provider name and version

Last explicit success First explicit failure Safe representative verification

Safe version observation

When the Codex CLI is the affected surface, codex --version is a bounded way to record the installed CLI version. Other surfaces may expose version information in their own About or diagnostics interface. Capability Lab does not invent equivalent commands for surfaces that do not document one.