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Paul BakausandClaude
c7b67b3832
The first real Claude Code Live run failed, and the subagent was not the cause. Root cause: progressive publication stages each revision as `.impeccable/live/artifacts/<id>-r<n>.<source-ext>`, nothing ever deleted them, and findSessionFile's walker skipped only node_modules/.git/dist/build. It searches src, app, pages, ... then `.`; a project whose source is not under one of those (this repo's own site lives in site/pages/) falls through to the `.` walk, where dot-directories sort before letters. So accept found the artifact instead of the real file. Two outcomes, both reproduced: where isGeneratedFile returns true it declines with mode: 'fallback' (what the run hit, after which the agent hand-carbonized several hundred lines across three stylesheets, including unrequested drive-by edits); where it returns false, accept writes the variant into the throwaway artifact and reports handled: true while real source never changes. The E2E suite could not have caught this. Every fixture puts source under `src/`, which is searched before the `.` walk can reach `.impeccable`. Five framework fixtures and three progressive scenarios pass because of fixture layout, not because the path works. I read that as evidence and shouldn't have. - Never search `.impeccable`: it is Impeccable's own state, never project source. - Retire a session's staged artifacts on accept/discard, so they cannot outlive the session and become a decoy for anything else that walks the tree. - Regression tests use a site/pages layout with artifacts present. All three fail against the previous code. Generator subagent removed, on both harnesses: The parent must hand-compress the design system into the handoff, and compression is lossy. Measured on the real run: a 6,826-char handoff carrying exactly one token reference, after the parent had itself read kinpaku-tokens.css. The subagent then spent 3 of its first 9 turns hunting DESIGN.md, gave up, and emitted 0 var(--token) uses and 22 raw oklch literals — violating its own spec's "Never invent raw colors when tokens exist" — including a 1:1 gold-on-gold contrast bug. Isolation is not a benefit here; knowing the design system is the job. Generation stays in the main thread, which already holds the tokens and writes them from the first byte, so carbonize is a move rather than a translation. Copy edits keep their subagent: applying a known set of ops to a named file is self-contained, so an isolated context costs nothing. That is the line. Progressive delivery stays for Codex and Claude Code, main-thread driven. Claude Code keeps the full benefit because its poll is a background task. Codex's poll blocks the foreground, so with no subagent the user sees variant 1 early via HMR but cannot accept it until the trio finishes; that is the cost of the simplification and it is worth naming. Prepared with AI assistance under maintainer direction. Co-Authored-By: Claude <noreply@anthropic.com>