Gap 1 from planning/2026-09-02-artifact_kind_gaps_for_frequent_agent_output.md.
Chose new first-class kinds over riding on html_fragment, resolving that
doc's open design question in favor of filtering support, raw-source
preservation (like markdown's .md sidecar), and server-owned validation.
- json: validated with json.loads at post time (400 on invalid JSON),
rendered with renderjson (collapsible tree), vendored locally.
- csv: parsed server-side with the stdlib csv module into columns/rows and
handed to Grid.js as plain data - no client-side CSV-parsing plugin
needed, keeping normalization server-owned. Vendored locally (MIT).
- Both preserve their original text as a sidecar file, generalizing what
was previously markdown-only handling (storage.py's SIDECAR_SUFFIXES) so
disk-size accounting, eviction cleanup, and ?raw=1 all cover json/csv too.
- Raw JSON is embedded in a <script type="application/json"> block with
`</script` occurrences escaped (safe because JSON's \/ escape round-trips
correctly) - verified with a live </script>-injection payload against the
actual running server, not just unit tests.
New migration (0012) for the KIND_CHOICES change - SQLite doesn't enforce
choices at the schema level, but Django's migration state tracks it.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
peter
e5d2f192df