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btipling merged 2 commits into from
Sep 3, 2026
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docs(agents): backend-agents durable-turn architecture row (H25) #930

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docs(agents): add backend-agents durable-turn architecture row
btipling Sep 3, 2026
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docs(agents): align Workflows step grain with toolExecuteStep batch
btipling Sep 3, 2026
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10 changes: 10 additions & 0 deletions AGENTS.md
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Expand Up @@ -265,6 +265,16 @@ ops inventory).

### Vercel Workflows (backend-agents)

- **Architecture — the Workflow run owns the turn.** A durable turn is owned by
the Workflow run started at `POST /api/turns`, independent of any attached
viewport: it survives tab close / refresh / logout. A viewport **attaches** to
a live run (hydrate from Blob + `GET /api/turns/:runId/stream`);
unmount/switch/New/Clear/logout is **detach only**, never a cancel — cancel is
the explicit `POST /api/turns/:runId/cancel`. **Tools are steps:** one
`'use step'` = one model round **or** one tool execution **or** one persist —
never a mega-step, never wrap `runAgentStream` in a single step. Inference is
server-side: production turns use `/api/turns`; `/api/agent` is the legacy
tests/JSON path.
- **Wiring ships by Git deploy:** `workflow` dependency + `withWorkflow(nextConfig)`
in `next.config.js`; `"use workflow"` fixtures/xhr live server-side
(`lib/workflows/*`, `app/api/workflows/smoke`).
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