Production OOM'd (JS heap 1.85 GB / 2 GB limit) during a ~20-step,
~28k-chunk autonomous agent turn. Heap snapshot analysis (memlab) showed a
single DefaultStreamTextResult retaining ~1.7 GB via the never-consumed
leftover tee() branch of its internal baseStream.
Root cause in ai@6.0.134: streamText substitutes the default text() output
strategy even when the caller passes NO `output` option. Its
createOutputTransformStream then accumulates the ENTIRE turn text and, on
EVERY text-delta, enqueues `{ part, partialOutput }` where partialOutput is
a flat snapshot of all text so far (JSON.stringify flattens the
cons-string) — O(n²) memory across the turn. Every consumer accessor tees
baseStream and keeps the second branch as the new baseStream; the final
leftover branch is never read, so its controller queue holds every chunk
(28,225 x ~164 KB in the OOM'd run) for the life of the turn.
Fix (pnpm patch on both dist/index.js and dist/index.mjs):
- pass the raw, possibly-undefined `output` option into
createOutputTransformStream instead of defaulting to text()
- when output == null, publish each text-delta immediately without
accumulating turn text or producing partialOutput snapshots; streaming
granularity is unchanged, and callers that DO request an output strategy
keep the original behavior
Our server never uses partialOutputStream / experimental_output / the
output option, so no behavior changes for us beyond memory.
Regression spec ai-sdk-partial-output.patch.spec.ts drives the real
patched SDK with MockLanguageModelV3: asserts per-delta textStream
granularity, an EMPTY experimental_partialOutputStream (tripwire — yields
one cumulative partial per delta when unpatched), and the PATCH(docmost
marker in both installed dist bundles. Also documents the patch in
AGENTS.md (must be re-created when bumping `ai`) and CHANGELOG.md.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
- openai provider: use .chat() (Chat Completions) instead of the default callable
(Responses API), which gateways reject on multi-turn -> 400.
- updateAiProviderSettings: assemble settings.ai.provider via jsonb_build_object
with ::text-cast bound params + jsonb_typeof self-heal (postgres.js was
double-encoding it into an array; the ::text cast avoids 'could not determine
data type of parameter').
- chat agent: drop the hard maxOutputTokens cap (truncated complex tool calls);
keep a tiny cap only on the test-connection ping.
- testConnection + chat stream: surface the real provider error (statusCode+message)
to logs and the UI instead of generic masks; never log the API key.
- chat UI: typing indicator, incremental streaming render, tool 'running' status, Stop.
Also bundled (prior uncommitted ai-chat work):
- history 'AI agent' provenance badge; vector RAG (pgvector image + page_embeddings
+ AI_QUEUE indexer + space-scoped semanticSearch); external MCP servers backend
(@ai-sdk/mcp client, SSRF IP-pinning, encrypted headers, admin CRUD/Test);
yjs duplicate-instance fix via pnpm patch (single CJS instance server-side).
* feat(tree): replace react-arborist with custom tree implementation
* feat(tree): keyboard arrow navigation between rows
* feat(emoji-picker): focus search input on open
* refactor(emoji): switch to @slidoapp/emoji-mart fork for accessibility
* feat(tree): Home/End and typeahead keyboard navigation
* feat(tree): roving tabindex and * to expand sibling subtrees
* feat(tree): Space activation and ARIA refinements
* fix(tree): move treeitem role to focusable row + aria-current
* feat: new image menu
* switch to resizable side handles
* use pixels
* refactor excalidraw and drawio menu
* support image resize undo
* video resize
* callout menu refresh
* refresh table menus
* fix color scheme
* fix: patch @tiptap/core ResizableNodeView to prevent resize sticking after mouseup
* feat: columns
* notes callout
* focus on first column
* capture tab key in column
* fix print
* hide columns menu when some nodes are focused
* fix print
* fix columns
* selective placeholder
* fix blockquote
* quote
* fix callout in columns
agent_vscode
vvzvlad
Philip Okugbe
Philip Okugbe