feat(eve): run subagents as durable background tasks by ruiconti · Pull Request #1773 · vercel/eve

ruiconti · 2026-08-07T05:47:36Z

Introduces the complete experimental.tasks runtime contract in one merge unit. The flag first appears together with the final model tools, persistence writer, stable agent identity, local/remote lifecycle routing, and release metadata.

Data flow

before: a subagent call blocked its parent turn until the child settled
after: dispatch returns one durable { taskId, agentId, status: \"working\" } receipt; task transitions later wake the parent through replay-identified session deliveries
before: child HITL targeted a parent turn inbox
after: the task run validates the outstanding batch, routes the complete request/challenge through the parent channel, delivers the answer to the exact local or remote child, then records answered

Correctness boundaries

Duplicate action call IDs are rejected before side effects. One agent owns at most one nonterminal task. Cancellation commits task state before aborting local or remote executors. Failed and cancelled work retains usage without reviving terminal status. Terminal snapshots remain readable after task-run retention expires, and terminal child addresses are removed instead of advertised as reusable.

Remote child streams use an authenticated parent-origin proxy. Clients receive only a server-authored childStreamPath; parent credentials are never forwarded cross-origin and remote credentials never enter the event stream.

This replaces the semantic/protocol portions of the v3 stack (#1517-#1522 and #1756-#1758). PR 4 is the merge-gating E2E acceptance suite.

Signed-off-by: Rui Conti <ruiconti@gmail.com>

vercel · 2026-08-07T05:47:44Z

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
eve-docs	Ready	Preview	Aug 7, 2026 5:49am

github-actions · 2026-08-07T05:51:13Z

Bundle + Package Summary: `apps/fixtures/weather-agent`

Key takeaways

Runtime delta: public routes 13 -> 15 (+2); 1 changed payload.

Delta vs `tasks-v4/02-create-once (c5d02e5)`

Area	Metric	Baseline	Current	Delta
Package	Packed tarball	7.67 MB	7.69 MB	+20.1 kB ⚠️
Package	Unpacked publish size	28.74 MB	28.82 MB	+79.6 kB ⚠️
Package	Installed footprint	72.17 MB	72.25 MB	+79.6 kB ⚠️
Package	Published files	3052	3078	+26
Package	Installed files	6760	6786	+26
Runtime	Unique function payloads	2	2	0
Runtime	Total function bytes	17.15 MB	17.34 MB	+188.9 kB ⚠️
Runtime	Public routes	13	15	+2

Changed function payloads vs tasks-v4/02-create-once (c5d02e5) (2)

Function	Status	Baseline	Current	Delta	Route changes
`functions/__server.func`	changed	8.57 MB	8.67 MB	+94.4 kB ⚠️	public +`/eve/v1/session/[parentSessionId]/subagents/[callId]/[childSessionId]/stream`, +`/eve/v1/task-input/[token]`
`functions/.well-known/workflow/v1/flow.func`	changed	8.57 MB	8.67 MB	+94.4 kB ⚠️	none

`eve init` install

Metric	Baseline	Current	Delta
Installed footprint	110.58 MB	110.66 MB	+79.6 kB ⚠️
Installed packages	121	121	0
dependencies	4	4	0
devDependencies	2	2	0
Dependency package bytes	43.22 MB	43.30 MB	+79.6 kB ⚠️
devDependency package bytes	5.04 MB	5.04 MB	0 B ➖

Build Metadata

Preset: vercel
Nitro: nitro@3.0.260610-beta
Output directory: apps/fixtures/weather-agent/.vercel/output
Build metadata timestamp: 2026-08-07T05:50:31.969Z
Route aliases: 15 public, 1 internal (16 total aliases)
Vercel routes in config: 18
Severity legend: 🔴 dominant/large, 🟠 notable, 🟡 watch, ⚪ small

Package Drill-Down

Package Details

Package: eve@0.30.7
Package directory: packages/eve
Tarball: 7.69 MB (eve-0.30.7.tgz)
Unpacked payload: 28.82 MB across 3078 published files
Installed footprint: 72.25 MB across 6786 installed files
Installed root package: 27.47 MB
Installed dependencies: 44.78 MB
Runtime dependencies: 2
Peer dependencies: 5 (4 optional)

Installed footprint is measured from an isolated temporary npm install of the packed tarball.

Heavy installed dependencies

eve: 27.47 MB (38.0%)
@rolldown/binding-linux-x64-gnu: 19.35 MB (26.8%)
ai: 6.67 MB (9.2%)
zod: 5.07 MB (7.0%)
undici: 3.50 MB (4.9%)

Publish payload breakdown

Published file size
🔴 dist/src/compiled/shadcn-registry/index.js       [################........] 9.68 MB 33.6%
🟠 dist/src/compiled/@photon-ai/chat-adapter-ime... [####....................] 2.42 MB 8.4%
🟠 dist/src/compiled/experimental-ai-sdk-code-mo... [###.....................] 1.51 MB 5.2%
🟡 dist/src/compiled/_chunks/node/undici-DWL_MYm... [#.......................] 502.4 kB 1.7%
🟡 dist/src/compiled/_chunks/workflow/undici-DWL... [#.......................] 502.4 kB 1.7%
🔴 Other published files                            [########################] 14.20 MB 49.3%

Installed footprint breakdown

Installed package size
🔴 eve                             [########################] 27.47 MB 38.0%
🔴 @rolldown/binding-linux-x64-gnu [#################.......] 19.35 MB 26.8%
🔴 ai                              [######..................] 6.67 MB 9.2%
🔴 zod                             [####....................] 5.07 MB 7.0%
🟠 undici                          [###.....................] 3.50 MB 4.9%
🟠 nitro                           [##......................] 2.41 MB 3.3%
🔴 Other installed packages        [#######.................] 7.79 MB 10.8%

Runtime dependencies (2)

Package	Range	Notes
`nitro`	`3.0.260610-beta`
`undici`	`8.9.0`

Peer dependencies (5)

Package	Range	Notes
`@opentelemetry/api`	`^1.0.0`	optional peer
`ai`	`catalog:`
`braintrust`	`^3.0.0`	optional peer
`just-bash`	`^3.0.0`	optional peer
`microsandbox`	`^0.5.0`	optional peer

eve init install drill-down

`eve init` install details

Command: eve init my-agent
Package manager: npm
Installed footprint: 110.66 MB across 8662 installed files
Installed packages: 121 total (115 transitive-only)
dependencies: 4 direct packages totaling 43.30 MB
devDependencies: 2 direct packages totaling 5.04 MB
Other transitive package files: 62.32 MB

Installed footprint is measured from an isolated temporary eve init my-agent using the current packed eve tarball.

Heavy installed dependencies

@typescript/typescript-linux-x64: 27.95 MB (25.3%)
eve: 27.47 MB (24.8%)
@rolldown/binding-linux-x64-gnu: 19.35 MB (17.5%)
zod: 9.02 MB (8.2%)
ai: 6.67 MB (6.0%)

Installed footprint breakdown

Installed package size
🔴 @typescript/typescript-linux-x64 [########################] 27.95 MB 25.3%
🔴 eve                              [########################] 27.47 MB 24.8%
🔴 @rolldown/binding-linux-x64-gnu  [#################.......] 19.35 MB 17.5%
🔴 zod                              [########................] 9.02 MB 8.2%
🔴 ai                               [######..................] 6.67 MB 6.0%
🟠 undici                           [###.....................] 3.50 MB 3.2%
🔴 Other installed packages         [##############..........] 16.70 MB 15.1%

dependencies (4)

Package	Range	Installed size	Share
`@vercel/connect`	`0.4.3`	141.0 kB	0.1%
`ai`	`^7.0.38`	6.67 MB	6.0%
`eve`	`file:eve-0.30.7.tgz`	27.47 MB	24.8%
`zod`	`4.4.3`	9.02 MB	8.2%

devDependencies (2)

Package	Range	Installed size	Share
`@types/node`	`24.x`	2.54 MB	2.3%
`typescript`	`7.0.2`	2.50 MB	2.3%

Function Drill-Down

Payload Size Graph

Unique function payload size and share of total
🔴 functions/.well-known/workflow/v1/flow.func     [########################] 8.67 MB 50.0%
🔴 functions/__server.func                         [########################] 8.67 MB 50.0%

Top Function Payloads

🟠 functions/.well-known/workflow/v1/flow.func • 1 public route • 8.67 MB

Metric	Value
Public routes	`/.well-known/workflow/v1/flow`
Runtime	`nodejs24.x`
Handler	`index.mjs`
Payload	8.67 MB
Function files	8.67 MB across 44 files
Traced dependencies	0 B
Signal	🟠 Bundled file `index.mjs` is 2.47 MB (28.5%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 index.mjs                       [########################] 2.47 MB 28.5%
🟠 _chunks/runtime-artifacts.mjs   [################........] 1.63 MB 18.9%
🟡 _libs/undici.mjs                [##########..............] 980.5 kB 11.3%
🟡 _chunks/sandbox.mjs             [#######.................] 769.0 kB 8.9%
🟡 _libs/@ai-sdk/gateway+[...].mjs [####....................] 432.8 kB 5.0%
🟠 Other bundled files             [#######################.] 2.38 MB 27.5%

🧾 Vercel Config

{
  "handler": "index.mjs",
  "launcherType": "Nodejs",
  "shouldAddHelpers": false,
  "supportsResponseStreaming": true,
  "runtime": "nodejs24.x",
  "maxDuration": "max",
  "experimentalTriggers": [
    {
      "type": "queue/v2beta",
      "topic": "__eve776561746865722d6167656e74_wkf_workflow_*",
      "consumer": "default",
      "retryAfterSeconds": 5,
      "initialDelaySeconds": 0
    }
  ],
  "environment": {
    "WORKFLOW_PRECONDITION_GUARD": "1"
  }
}

🟠 functions/__server.func • 14 public routes, 1 internal alias • 8.67 MB

Metric	Value
Public routes	`/` `/eve/v1/callback/[token]` `/eve/v1/connections/[name]/callback/[token]` `/eve/v1/health` `/eve/v1/info` `/eve/v1/session` `/eve/v1/session/[parentSessionId]/subagents/[callId]/[childSessionId]/stream` `/eve/v1/session/[sessionId]` `/eve/v1/session/[sessionId]/cancel` `/eve/v1/session/[sessionId]/stream` `/eve/v1/session/clear` `/eve/v1/session/compact` `/eve/v1/session/reset` `/eve/v1/task-input/[token]`
Internal aliases	`/__server`
Runtime	`nodejs24.x`
Handler	`index.mjs`
Payload	8.67 MB
Function files	8.67 MB across 44 files
Traced dependencies	0 B
Signal	🟠 Bundled file `index.mjs` is 2.47 MB (28.5%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 index.mjs                       [########################] 2.47 MB 28.5%
🟠 _chunks/runtime-artifacts.mjs   [################........] 1.63 MB 18.9%
🟡 _libs/undici.mjs                [##########..............] 980.5 kB 11.3%
🟡 _chunks/sandbox.mjs             [#######.................] 769.0 kB 8.9%
🟡 _libs/@ai-sdk/gateway+[...].mjs [####....................] 432.8 kB 5.0%
🟠 Other bundled files             [#######################.] 2.38 MB 27.5%

🧾 Vercel Config

{
  "handler": "index.mjs",
  "launcherType": "Nodejs",
  "shouldAddHelpers": false,
  "supportsResponseStreaming": true,
  "runtime": "nodejs24.x"
}

Build Timing: `e2e/fixtures/agent-tools-sandbox`

This is an informational timing measurement inside eve build, from preflight through publication. Output-size measurement and profile writing are excluded.

Build mode: deployable Vercel build with sandbox template prewarm included.

Build pipeline: 1.75 s -> 1.96 s (+210.0 ms) vs tasks-v4/02-create-once (c5d02e5).
Timing is informational: shared GitHub runners are too variable for a hard timing budget.

Detailed phase timings vs `tasks-v4/02-create-once (c5d02e5)`

Phase	Baseline	Current	Delta
`extension.check`	5.9 ms	0.9 ms	-5.0 ms
`project.resolve`	1.3 ms	0.4 ms	-0.9 ms
`workspace.create`	0.8 ms	0.5 ms	-0.3 ms
`host.prepare`	192.3 ms	179.2 ms	-13.1 ms
`vercel.service-prefix.resolve`	1.3 ms	1.4 ms	+0.1 ms
`nitro.create`	174.2 ms	204.6 ms	+30.4 ms
`sandbox.prewarm`	290.5 ms	272.6 ms	-17.9 ms
`nitro.cache.prepare`	0.2 ms	0.2 ms	0.0 ms
`nitro.prepare`	0.6 ms	0.6 ms	0.0 ms
`nitro.public-assets`	0.6 ms	0.6 ms	0.0 ms
`nitro.prerender`	0.3 ms	0.4 ms	+0.1 ms
`nitro.bundle`	1.03 s	1.12 s	+88.6 ms
`nitro.cache.write`	0.3 ms	0.2 ms	-0.1 ms
`vercel.workflow-function.materialize`	48.1 ms	36.8 ms	-11.3 ms
`agent-summary.emit`	0.4 ms	0.5 ms	+0.1 ms
`nitro.close`	0.1 ms	0.2 ms	+0.1 ms
`output.publish`	7.5 ms	147.7 ms	+140.2 ms
`workspace.remove`	1.5 ms	1.6 ms	+0.1 ms

ruiconti added 2 commits August 7, 2026 01:22

feat(eve): run subagents as durable background tasks

1ecf876

Signed-off-by: Rui Conti <ruiconti@gmail.com>

feat(eve): proxy remote child streams through the parent

10494d7

Signed-off-by: Rui Conti <ruiconti@gmail.com>

ruiconti mentioned this pull request Aug 7, 2026

test(e2e): gate the final background task contract #1774

Open

vercel Bot deployed to Preview – eve-docs August 7, 2026 05:49 View deployment

Navigation Menu

Uh oh!

feat(eve): run subagents as durable background tasks - #1773

feat(eve): run subagents as durable background tasks#1773
ruiconti wants to merge 2 commits into
tasks-v4/02-create-oncefrom
tasks-v4/03-runtime

ruiconti commented Aug 7, 2026

Uh oh!

vercel Bot commented Aug 7, 2026 •

edited

Loading

Uh oh!

github-actions Bot commented Aug 7, 2026

Package Details

`eve init` install details

Payload Size Graph

Top Function Payloads

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

1 participant

Uh oh!

Conversation

ruiconti commented Aug 7, 2026

Data flow

Correctness boundaries

Uh oh!

vercel Bot commented Aug 7, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

github-actions Bot commented Aug 7, 2026

Bundle + Package Summary: apps/fixtures/weather-agent

Delta vs tasks-v4/02-create-once (c5d02e5)

eve init install

Package Details

eve init install details

Payload Size Graph

Top Function Payloads

Build Timing: e2e/fixtures/agent-tools-sandbox

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

1 participant

vercel Bot commented Aug 7, 2026 •

edited

Loading

Bundle + Package Summary: `apps/fixtures/weather-agent`

Delta vs `tasks-v4/02-create-once (c5d02e5)`

`eve init` install

`eve init` install details

Build Timing: `e2e/fixtures/agent-tools-sandbox`