Inspect the files of an EXISTING artifact: list them, search their text, read them, or review the commit history. Works with no shell, no git and no network access, so prefer it whenever you cannot run git. Pass the sessionId (the last path segment of a .../chat/<sessionId> URL). A canvasDraft field, when authorized, reports an uncommitted Canvas draft. Use action draft to inspect its projection overlay explicitly; ordinary reads remain committed files. Draft access requires write permission. Typical flow to change something: action "search" to find the file, action "read" for the files you will edit, then artifact-edit. Every response includes "revision", the artifact's current commit — pass it back as artifact-edit's baseRevision. Use action "read" with a "revision" to see how a file looked at an earlier commit (this is how you undo something). Assets — images, fonts, media — are readable too: action "read" answers with size, mime and oid under "asset": true whenever a file's bytes are not text, instead of content. That check is on the bytes, so it is the authority: an SVG reads as text, and a file with an unfamiliar extension may still come back as an asset. When a search comes back empty, check "notSearched": "assets" counts binary files a text query can never match, and "excluded" counts files under node_modules, dist or build — re-run with includeExcluded true to search those. A "tree" listing also maps any path artifact-edit cannot change under "unwritable". For generation or build progress use artifact-status instead; this shows the commit log, not build state.