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[ai] Add collectUIMessages option to accumulate and return UIMessage[] from agent.stream#768

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[ai] Add collectUIMessages option to accumulate and return UIMessage[] from agent.stream#768
VaguelySerious merged 4 commits into
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@VaguelySerious VaguelySerious commented Jan 12, 2026 •
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Related to #688 and #739

This adds a new option collectUIMessages to agent.stream, which, if passed, adds a stream transformation for accumulating stream chunks in durable state, and will return uiMessages: UIMessage[] from the agent.stream call.

Screenshot 2026-01-12 at 4 41 13 PM

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Accumulate
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Signed-off-by: Peter Wielander <mittgfu@gmail.com>
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[ai] Add collectUIMessages option to accumulate and return UIMessag…
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…e[] from agent.stream

Signed-off-by: Peter Wielander <mittgfu@gmail.com>
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Signed-off-by: Peter Wielander <mittgfu@gmail.com>
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🦋 Changeset detected

Latest commit: 564c895

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages
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@workflow/ai Patch
@workflow/docs-typecheck Patch

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🧪 E2E Test Results

❌ Some tests failed

Summary

Passed Failed Skipped Total
✅ ▲ Vercel Production 363 0 11 374
✅ 💻 Local Development 332 0 8 340
✅ 📦 Local Production 332 0 8 340
✅ 🐘 Local Postgres 332 0 8 340
✅ 🪟 Windows 34 0 0 34
❌ 🌍 Community Worlds 131 17 0 148
Total 1524 17 35 1576

❌ Failed Tests

🌍 Community Worlds (17 failed)

mongodb (1 failed):

  • webhookWorkflow

redis (1 failed):

  • webhookWorkflow

starter (14 failed):

  • addTenWorkflow
  • addTenWorkflow
  • error handling error propagation workflow errors nested function calls preserve message and stack trace
  • error handling error propagation workflow errors cross-file imports preserve message and stack trace
  • error handling error propagation step errors basic step error preserves message and stack trace
  • error handling error propagation step errors cross-file step error preserves message and function names in stack
  • error handling retry behavior regular Error retries until success
  • error handling retry behavior FatalError fails immediately without retries
  • error handling catchability FatalError can be caught and detected with FatalError.is()
  • hookCleanupTestWorkflow - hook token reuse after workflow completion
  • stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
  • stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
  • spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step
  • pathsAliasWorkflow - TypeScript path aliases resolve correctly

turso (1 failed):

  • webhookWorkflow

Details by Category

✅ ▲ Vercel Production
App Passed Failed Skipped
✅ astro 33 0 1
✅ example 33 0 1
✅ express 33 0 1
✅ fastify 33 0 1
✅ hono 33 0 1
✅ nextjs-turbopack 33 0 1
✅ nextjs-webpack 33 0 1
✅ nitro 33 0 1
✅ nuxt 33 0 1
✅ sveltekit 33 0 1
✅ vite 33 0 1
✅ 💻 Local Development
App Passed Failed Skipped
✅ astro-stable 33 0 1
✅ express-stable 33 0 1
✅ fastify-stable 33 0 1
✅ hono-stable 33 0 1
✅ nextjs-turbopack-stable 34 0 0
✅ nextjs-webpack-stable 34 0 0
✅ nitro-stable 33 0 1
✅ nuxt-stable 33 0 1
✅ sveltekit-stable 33 0 1
✅ vite-stable 33 0 1
✅ 📦 Local Production
App Passed Failed Skipped
✅ astro-stable 33 0 1
✅ express-stable 33 0 1
✅ fastify-stable 33 0 1
✅ hono-stable 33 0 1
✅ nextjs-turbopack-stable 34 0 0
✅ nextjs-webpack-stable 34 0 0
✅ nitro-stable 33 0 1
✅ nuxt-stable 33 0 1
✅ sveltekit-stable 33 0 1
✅ vite-stable 33 0 1
✅ 🐘 Local Postgres
App Passed Failed Skipped
✅ astro-stable 33 0 1
✅ express-stable 33 0 1
✅ fastify-stable 33 0 1
✅ hono-stable 33 0 1
✅ nextjs-turbopack-stable 34 0 0
✅ nextjs-webpack-stable 34 0 0
✅ nitro-stable 33 0 1
✅ nuxt-stable 33 0 1
✅ sveltekit-stable 33 0 1
✅ vite-stable 33 0 1
✅ 🪟 Windows
App Passed Failed Skipped
✅ nextjs-turbopack 34 0 0
❌ 🌍 Community Worlds
App Passed Failed Skipped
✅ mongodb-dev 3 0 0
❌ mongodb 33 1 0
✅ redis-dev 3 0 0
❌ redis 33 1 0
✅ starter-dev 3 0 0
❌ starter 20 14 0
✅ turso-dev 3 0 0
❌ turso 33 1 0

📋 View full workflow run

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📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🌐 Starter 🥇 Next.js (Turbopack) 0.038s (+18.1% 🔺) 1.014s (~) 0.976s 10 1.00x
🌐 Redis Next.js (Turbopack) 0.040s (+13.1% 🔺) 1.017s (~) 0.977s 10 1.05x
💻 Local Next.js (Turbopack) 0.044s (+10.3% 🔺) 1.020s (~) 0.976s 10 1.16x
💻 Local Express 0.045s (-6.5% 🟢) 1.008s (~) 0.963s 10 1.18x
💻 Local Nitro 0.046s (+10.5% 🔺) 1.006s (~) 0.960s 10 1.22x
🌐 MongoDB Next.js (Turbopack) 0.094s (-27.0% 🟢) 1.018s (~) 0.925s 10 2.47x
🌐 Turso Next.js (Turbopack) 0.105s (-2.2%) 1.014s (~) 0.910s 10 2.76x
🐘 Postgres Next.js (Turbopack) 0.118s (-2.7%) 1.021s (~) 0.902s 10 3.13x
🐘 Postgres Express 0.263s (-29.3% 🟢) 1.015s (~) 0.751s 10 6.95x
🐘 Postgres Nitro 0.288s (+12.0% 🔺) 1.012s (-0.7%) 0.724s 10 7.60x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 0.558s (-27.3% 🟢) 1.649s (-4.3%) 1.090s 10 1.00x
▲ Vercel Next.js (Turbopack) 0.576s (-24.9% 🟢) 1.608s (-9.1% 🟢) 1.032s 10 1.03x
▲ Vercel Express 0.613s (-20.9% 🟢) 1.488s (-7.2% 🟢) 0.875s 10 1.10x

🔍 Observability: Nitro | Next.js (Turbopack) | Express

workflow with 1 step

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🌐 Starter 🥇 Next.js (Turbopack) 1.095s (+2.2%) 2.010s (~) 0.915s 10 1.00x
💻 Local Next.js (Turbopack) 1.099s (~) 2.015s (~) 0.916s 10 1.00x
🌐 Redis Next.js (Turbopack) 1.099s (+1.3%) 2.013s (~) 0.914s 10 1.00x
💻 Local Nitro 1.111s (~) 2.005s (~) 0.894s 10 1.01x
💻 Local Express 1.121s (+0.7%) 2.007s (~) 0.886s 10 1.02x
🌐 Turso Next.js (Turbopack) 1.301s (-0.8%) 2.012s (~) 0.712s 10 1.19x
🌐 MongoDB Next.js (Turbopack) 1.302s (+0.7%) 2.014s (~) 0.712s 10 1.19x
🐘 Postgres Next.js (Turbopack) 1.913s (~) 2.018s (~) 0.106s 10 1.75x
🐘 Postgres Nitro 2.150s (-2.7%) 3.014s (~) 0.864s 10 1.96x
🐘 Postgres Express 2.404s (+9.0% 🔺) 3.015s (~) 0.611s 10 2.20x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 2.756s (-0.7%) 3.785s (+3.4%) 1.029s 10 1.00x
▲ Vercel Next.js (Turbopack) 2.863s (+4.1%) 3.705s (-2.6%) 0.842s 10 1.04x
▲ Vercel Express 3.029s (+11.7% 🔺) 3.765s (+4.1%) 0.737s 10 1.10x

🔍 Observability: Nitro | Next.js (Turbopack) | Express

workflow with 10 sequential steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🌐 Starter 🥇 Next.js (Turbopack) 10.597s (+1.2%) 11.011s (~) 0.414s 5 1.00x
🌐 Redis Next.js (Turbopack) 10.650s (+0.9%) 11.015s (~) 0.365s 5 1.01x
💻 Local Next.js (Turbopack) 10.707s (+0.7%) 11.018s (~) 0.312s 5 1.01x
💻 Local Nitro 10.767s (~) 11.013s (~) 0.245s 5 1.02x
💻 Local Express 10.823s (~) 11.016s (~) 0.193s 5 1.02x
🌐 Turso Next.js (Turbopack) 12.196s (~) 13.027s (~) 0.830s 5 1.15x
🌐 MongoDB Next.js (Turbopack) 12.230s (~) 13.024s (~) 0.794s 5 1.15x
🐘 Postgres Next.js (Turbopack) 15.435s (+4.5%) 16.238s (+3.8%) 0.803s 5 1.46x
🐘 Postgres Express 20.229s (-0.6%) 21.046s (~) 0.817s 5 1.91x
🐘 Postgres Nitro 20.375s (~) 20.841s (-0.9%) 0.466s 5 1.92x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Next.js (Turbopack) 24.300s (+8.1% 🔺) 25.264s (+9.1% 🔺) 0.964s 5 1.00x
▲ Vercel Express 24.381s (+6.0% 🔺) 25.047s (+6.0% 🔺) 0.665s 5 1.00x
▲ Vercel Nitro 25.309s (+15.5% 🔺) 26.132s (+14.2% 🔺) 0.822s 5 1.04x

🔍 Observability: Next.js (Turbopack) | Express | Nitro

Promise.all with 10 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🌐 Starter 🥇 Next.js (Turbopack) 1.352s (+3.6%) 2.008s (~) 0.656s 15 1.00x
🌐 Redis Next.js (Turbopack) 1.352s (+2.4%) 2.010s (~) 0.657s 15 1.00x
💻 Local Nitro 1.397s (-0.8%) 2.004s (~) 0.607s 15 1.03x
💻 Local Next.js (Turbopack) 1.417s (+2.9%) 2.012s (~) 0.595s 15 1.05x
💻 Local Express 1.432s (+2.1%) 2.007s (~) 0.575s 15 1.06x
🐘 Postgres Next.js (Turbopack) 1.896s (+13.2% 🔺) 2.039s (+1.3%) 0.143s 15 1.40x
🌐 MongoDB Next.js (Turbopack) 2.134s (~) 3.013s (~) 0.879s 10 1.58x
🌐 Turso Next.js (Turbopack) 2.217s (~) 3.013s (~) 0.796s 10 1.64x
🐘 Postgres Nitro 2.376s (-2.3%) 3.011s (~) 0.635s 10 1.76x
🐘 Postgres Express 2.571s (+5.6% 🔺) 3.013s (~) 0.442s 10 1.90x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Next.js (Turbopack) 2.948s (-2.0%) 3.782s (-2.4%) 0.834s 8 1.00x
▲ Vercel Express 3.023s (+4.1%) 3.784s (+2.6%) 0.761s 9 1.03x
▲ Vercel Nitro 3.190s (+6.6% 🔺) 4.888s (+29.2% 🔺) 1.698s 7 1.08x

🔍 Observability: Next.js (Turbopack) | Express | Nitro

Promise.all with 25 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Next.js (Turbopack) 2.087s (-1.7%) 2.924s (-1.3%) 0.838s 11 1.00x
💻 Local Nitro 2.183s (-1.9%) 3.148s (-0.7%) 0.965s 10 1.05x
💻 Local Express 2.305s (+3.8%) 3.258s (+3.1%) 0.953s 10 1.10x
🌐 Redis Next.js (Turbopack) 2.481s (+6.0% 🔺) 3.013s (~) 0.532s 10 1.19x
🌐 Starter Next.js (Turbopack) 2.495s (+5.0% 🔺) 3.010s (~) 0.515s 10 1.20x
🐘 Postgres Next.js (Turbopack) 2.729s (+6.3% 🔺) 3.017s (~) 0.288s 10 1.31x
🐘 Postgres Nitro 2.782s (-8.7% 🟢) 3.021s (-20.1% 🟢) 0.239s 10 1.33x
🐘 Postgres Express 2.930s (+3.8%) 3.015s (~) 0.085s 10 1.40x
🌐 Turso Next.js (Turbopack) 4.654s (-0.8%) 5.179s (~) 0.524s 6 2.23x
🌐 MongoDB Next.js (Turbopack) 4.659s (+1.0%) 5.187s (~) 0.528s 6 2.23x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Next.js (Turbopack) 4.054s (+19.6% 🔺) 4.907s (+22.2% 🔺) 0.853s 7 1.00x
▲ Vercel Nitro 4.142s (+11.8% 🔺) 5.039s (+16.1% 🔺) 0.898s 6 1.02x
▲ Vercel Express 4.578s (+43.4% 🔺) 5.341s (+48.4% 🔺) 0.763s 6 1.13x

🔍 Observability: Next.js (Turbopack) | Nitro | Express

Promise.race with 10 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🌐 Redis 🥇 Next.js (Turbopack) 1.357s (+2.9%) 2.010s (~) 0.653s 15 1.00x
🌐 Starter Next.js (Turbopack) 1.364s (+3.7%) 2.007s (~) 0.643s 15 1.01x
💻 Local Next.js (Turbopack) 1.413s (~) 2.014s (~) 0.601s 15 1.04x
💻 Local Nitro 1.418s (~) 2.005s (~) 0.586s 15 1.05x
💻 Local Express 1.449s (+1.9%) 2.006s (~) 0.558s 15 1.07x
🐘 Postgres Next.js (Turbopack) 1.511s (-13.9% 🟢) 2.012s (~) 0.501s 15 1.11x
🐘 Postgres Express 1.656s (-15.6% 🟢) 2.080s (-6.8% 🟢) 0.424s 15 1.22x
🐘 Postgres Nitro 1.901s (+7.3% 🔺) 2.157s (+7.3% 🔺) 0.257s 14 1.40x
🌐 MongoDB Next.js (Turbopack) 2.158s (~) 3.014s (~) 0.856s 10 1.59x
🌐 Turso Next.js (Turbopack) 2.208s (-0.5%) 3.010s (~) 0.802s 10 1.63x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 2.813s (+0.9%) 3.835s (+2.9%) 1.022s 8 1.00x
▲ Vercel Express 2.979s (-5.2% 🟢) 3.725s (-4.1%) 0.746s 9 1.06x
▲ Vercel Next.js (Turbopack) 2.987s (+6.2% 🔺) 3.907s (+2.1%) 0.920s 8 1.06x

🔍 Observability: Nitro | Express | Next.js (Turbopack)

Promise.race with 25 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Next.js (Turbopack) 2.305s (+7.1% 🔺) 3.261s (+7.0% 🔺) 0.956s 10 1.00x
💻 Local Nitro 2.311s (+4.8%) 3.219s (+1.9%) 0.909s 10 1.00x
💻 Local Express 2.478s (+9.6% 🔺) 3.304s (+2.4%) 0.827s 10 1.07x
🌐 Starter Next.js (Turbopack) 2.484s (+4.7%) 3.009s (~) 0.525s 10 1.08x
🌐 Redis Next.js (Turbopack) 2.489s (+5.4% 🔺) 3.044s (+1.1%) 0.555s 10 1.08x
🐘 Postgres Next.js (Turbopack) 2.578s (~) 3.027s (~) 0.449s 10 1.12x
🐘 Postgres Nitro 2.638s (-7.6% 🟢) 3.011s (-3.7%) 0.373s 10 1.14x
🐘 Postgres Express 2.871s (+5.1% 🔺) 3.123s (+3.5%) 0.252s 10 1.25x
🌐 MongoDB Next.js (Turbopack) 4.674s (+0.7%) 5.180s (~) 0.506s 6 2.03x
🌐 Turso Next.js (Turbopack) 4.716s (+2.0%) 5.181s (~) 0.465s 6 2.05x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 4.479s (+32.0% 🔺) 4.954s (+20.1% 🔺) 0.475s 7 1.00x
▲ Vercel Next.js (Turbopack) 4.515s (+43.2% 🔺) 5.114s (+30.5% 🔺) 0.599s 6 1.01x
▲ Vercel Nitro 4.876s (+53.7% 🔺) 5.665s (+47.8% 🔺) 0.789s 6 1.09x

🔍 Observability: Express | Next.js (Turbopack) | Nitro

Stream Benchmarks (includes TTFB metrics)
workflow with stream

💻 Local Development

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
🌐 Starter 🥇 Next.js (Turbopack) 0.133s (+42.0% 🔺) 1.006s (~) 0.000s (+100.0% 🔺) 1.013s (~) 0.881s 10 1.00x
🌐 Redis Next.js (Turbopack) 0.139s (+19.9% 🔺) 1.004s (~) 0.000s (+Infinity% 🔺) 1.013s (~) 0.874s 10 1.05x
💻 Local Next.js (Turbopack) 0.146s (+5.5% 🔺) 1.003s (~) 0.020s (+22.4% 🔺) 1.031s (~) 0.885s 10 1.10x
💻 Local Nitro 0.170s (-4.0%) 0.992s (~) 0.016s (+5.4% 🔺) 1.021s (~) 0.851s 10 1.28x
💻 Local Express 0.185s (+6.6% 🔺) 0.992s (~) 0.018s (+12.0% 🔺) 1.026s (~) 0.840s 10 1.40x
🌐 Turso Next.js (Turbopack) 0.456s (-8.1% 🟢) 0.997s (+4.9%) 0.000s (+Infinity% 🔺) 1.014s (~) 0.558s 10 3.44x
🌐 MongoDB Next.js (Turbopack) 0.508s (-2.4%) 0.941s (+1.7%) 0.000s (NaN%) 1.013s (~) 0.505s 10 3.83x
🐘 Postgres Next.js (Turbopack) 1.273s (+46.9% 🔺) 1.904s (+69.0% 🔺) 0.000s (~) 2.019s (+52.9% 🔺) 0.746s 10 9.60x
🐘 Postgres Nitro 2.280s (+3.7%) 2.756s (-3.1%) 0.000s (-100.0% 🟢) 3.014s (~) 0.734s 10 17.20x
🐘 Postgres Express 2.436s (+3.0%) 2.610s (-2.6%) 0.000s (+Infinity% 🔺) 3.017s (~) 0.581s 10 18.37x

▲ Production (Vercel)

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Next.js (Turbopack) 2.857s (-5.4% 🟢) 3.269s (-3.8%) 0.961s (+58.8% 🔺) 4.710s (+4.4%) 1.853s 10 1.00x
▲ Vercel Nitro 2.863s (-4.9%) 3.263s (-2.6%) 0.418s (-12.0% 🟢) 4.190s (-2.4%) 1.327s 10 1.00x
▲ Vercel Express 2.893s (-7.1% 🟢) 3.270s (-3.7%) 0.425s (-15.1% 🟢) 4.164s (-7.2% 🟢) 1.271s 10 1.01x

🔍 Observability: Next.js (Turbopack) | Nitro | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World 🥇 Fastest Framework Wins
💻 Local Next.js (Turbopack) 7/8
🐘 Postgres Next.js (Turbopack) 8/8
▲ Vercel Next.js (Turbopack) 4/8
Fastest World by Framework

Winner determined by most benchmark wins

Framework 🥇 Fastest World Wins
Express 💻 Local 8/8
Next.js (Turbopack) 🌐 Starter 5/8
Nitro 💻 Local 8/8
Column Definitions
  • Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
  • TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
  • Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
  • Wall Time: Total testbench time (trigger workflow + poll for result)
  • Overhead: Testbench overhead (Wall Time - Workflow Time)
  • Samples: Number of benchmark iterations run
  • vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

  • 💻 Local: In-memory filesystem world (local development)
  • 🐘 Postgres: PostgreSQL database world (local development)
  • ▲ Vercel: Vercel production/preview deployment
  • 🌐 Starter: Community world (local development)
  • 🌐 Turso: Community world (local development)
  • 🌐 MongoDB: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Jazz: Community world (local development)

📋 View full workflow run

@VaguelySerious
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Signed-off-by: Peter Wielander <mittgfu@gmail.com>
@VaguelySerious VaguelySerious mentioned this pull request Jan 12, 2026
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pranaygp commented Jan 12, 2026

should this use the experimental_ convention from AI sdk? I'm just worried about the API diverge between us and AI sdk but maybe I shouldn't be?

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VaguelySerious commented Jan 13, 2026

I'm just worried about the API diverge between us and AI sdk but maybe I shouldn't be?

@pranaygp Since we're only adding optional properties to existing interfaces, I'm less worried, since the property simply doesn't exist in AI SDK, and this is specifically only relevant for DurableAgent (since AI SDK has .toUIMessageStream({onFinish: (messages) => >...}) which DurableAgent hides

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VaguelySerious commented Jan 14, 2026

Merging since it was in review for two days

@VaguelySerious VaguelySerious merged commit 49bb48a into main Jan 14, 2026
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@VaguelySerious VaguelySerious deleted the peter/ui-message-return-v2 branch January 14, 2026 12:17
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VaguelySerious added a commit that referenced this pull request Jan 16, 2026
@VaguelySerious
[ai] Add collectUIMessages option to accumulate and return UIMessage[…
e336fc4 
…] from agent.stream (#768)
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@TooTallNate TooTallNate Awaiting requested review from TooTallNate

@pranaygp pranaygp Awaiting requested review from pranaygp

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@VaguelySerious @pranaygp