The triage runtime connected its MCP clients with Promise.all, so a single
unreachable/misconfigured server (bad key, sidecar down, hang) rejected the
whole run and surfaced as a fatal "⚠️ Agent error: Failed to connect to
MCP server" — the bot was dead for every request, even ones needing no MCP.
Connect each server independently (Promise.allSettled) with an 8s timeout,
drop the ones that fail, and let the agent run with whatever's left (web search,
rendering, thread reading, and any MCP that did connect). A per-turn system note
lists any down sources so the model only tells the user a source is unreachable
if they actually ask for it, and never invents data. Connections are retried
each turn, so a transient outage self-heals.
- runtime.ts: pass the bridge's forwarded client tools (convertInputToTanStackAI's
tools) into chat() alongside web_search + MCP, so generative-UI cards and the
confirm_write HITL gate work; drop the prompt line that made the model narrate
charts with a trailing "Charting …" sentence (it landed after the image).
- render-chart / render-diagram: post the caption as a header BEFORE the image
(a file upload's message lands a beat after postFile resolves, so caption-first
keeps a stable caption → image order) and drop the false "rendered above" wording.
Depends on the @copilotkit/runtime factory tool-lifecycle fix (#5572) and the
bot-slack HITL/render-order fix (#5573).
The example's runtime agent needed OpenAI's hosted `web_search` tool, but
BuiltInAgent's classic `tools` only accepts handler-based `ToolDefinition[]`
(needs `execute`) — it can't carry a provider/hosted tool. So switch the
agent to BuiltInAgent **factory mode** (`type: "tanstack"`) and drive it with
TanStack AI's `chat()`:
- `openaiText(model)` adapter (OpenAI Responses API; gpt-5.5 default)
- `webSearchTool({ type: "web_search" })` provider tool (`@tanstack/ai-openai/tools`)
- Linear/Notion MCP via `@tanstack/ai-mcp` `createMCPClient` (HTTP + bearer),
created per-run; `chat()` discovers their tools and closes the connections
- `convertInputToTanStackAI(ctx.input)` bridges AG-UI input → `chat()`;
BuiltInAgent converts `chat()`'s stream back to AG-UI events
OpenAI-only now (web search is OpenAI-specific); AGENT_MODEL accepts a bare
OpenAI id or an "openai/<id>" form. Adds @tanstack/ai, @tanstack/ai-openai,
@tanstack/ai-mcp to the example.
100% JSX bot at feature parity with the PoC example: issue/page cards,
tables, Chart.js charts, Mermaid diagrams, incident/status/links cards,
a confirm_write HITL gate, and /agent + /triage slash commands.
Registers examples/slack in the pnpm workspace.
Alem Tuzlak