feat(eve): add the durable task foundation, inert by ruiconti · Pull Request #1518 · vercel/eve

ruiconti · 2026-08-01T20:30:07Z

Part 2/5 of the experimental.tasks stack, on top of #1517. New packages/eve/src/tasks/ modules plus the durable task run; nothing references them yet.

What

TaskStatus/TaskView/TaskOutput and a pure transition function: terminal is final, working <-> input_required, repeated cancel is a noop, and failed always carries its error as TaskOutput.error (failure is the state; the error output is its consequence — diverges from MCP, which reserves failed for protocol errors).
The task run: a small stable-named workflow that is the single writer for one task's lifecycle.
The eve.tasks session index and replay-idempotent task ids.

Data flow

Task state never lives in session state. Writers and readers meet at the run:

write: command → the run's private hook → transition function → full TaskView snapshot appended to the run's eve.task stream. Rejected commands (late completion after cancel) append nothing.
read: getRun(taskRunId).getReadable({ namespace, startIndex: -1 }) tail-read. Snapshots are trusted without re-validation because the run is the only writer.
parent session: only { taskId, taskRunId, commandToken } under eve.tasks. commandToken is a routing credential and never renders to the model.

The dedicated run comes from the #1190 spike: session state threads through step results, but callback routes and child executors must update task state without holding the current snapshot. The run also serializes competing completion/cancel/input transitions.

Task ids reuse the agent-handle operation-id derivation — hash(parentSessionId, parentTurnId, callId) — so replayed creation for the same call yields the same task. A duplicate run for the same task loses the hook claim and exits.

Part of #1084.

vercel · 2026-08-01T20:30:15Z

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Project	Deployment	Actions	Updated (UTC)
eve-docs	Ready	Preview	Aug 7, 2026 3:36am
eve-docs-4759	Ready	Preview, v0	Aug 7, 2026 3:36am

github-actions · 2026-08-01T20:33:47Z

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

Key takeaways

Runtime delta: 1 changed payload.

Delta vs `tasks/01-flag (a807560)`

Area	Metric	Baseline	Current	Delta
Package	Packed tarball	7.66 MB	7.67 MB	+8.1 kB ⚠️
Package	Unpacked publish size	28.70 MB	28.72 MB	+23.2 kB ⚠️
Package	Installed footprint	72.12 MB	72.15 MB	+23.2 kB ⚠️
Package	Published files	3034	3051	+17
Package	Installed files	6742	6759	+17
Runtime	Unique function payloads	2	2	0
Runtime	Total function bytes	16.99 MB	17.04 MB	+53.8 kB ⚠️
Runtime	Public routes	13	13	0

Changed function payloads vs tasks/01-flag (a807560) (2)

Function	Status	Baseline	Current	Delta	Route changes
`functions/__server.func`	changed	8.49 MB	8.52 MB	+26.9 kB ⚠️	public +`/eve/v1/session/[sessionId]/clear`, +`/eve/v1/session/[sessionId]/compact`, +`/eve/v1/session/[sessionId]/reset` public -`/eve/v1/session/clear`, -`/eve/v1/session/compact`, -`/eve/v1/session/reset`
`functions/.well-known/workflow/v1/flow.func`	changed	8.49 MB	8.52 MB	+26.9 kB ⚠️	none

`eve init` install

Metric	Baseline	Current	Delta
Installed footprint	110.53 MB	110.56 MB	+23.2 kB ⚠️
Installed packages	121	121	0
dependencies	4	4	0
devDependencies	2	2	0
Dependency package bytes	43.17 MB	43.20 MB	+23.2 kB ⚠️
devDependency package bytes	5.04 MB	5.04 MB	0 B ➖

eve init dependency changes vs tasks/01-flag (a807560)

dependencies

Changed: eve@file:eve-0.30.7.tgz -> eve@file:eve-0.31.0.tgz

Build Metadata

Preset: vercel
Nitro: nitro@3.0.260610-beta
Output directory: apps/fixtures/weather-agent/.vercel/output
Build metadata timestamp: 2026-08-07T03:38:03.573Z
Route aliases: 13 public, 1 internal (14 total aliases)
Vercel routes in config: 16
Severity legend: 🔴 dominant/large, 🟠 notable, 🟡 watch, ⚪ small

Package Drill-Down

Package Details

Package: eve@0.31.0
Package directory: packages/eve
Tarball: 7.67 MB (eve-0.31.0.tgz)
Unpacked payload: 28.72 MB across 3051 published files
Installed footprint: 72.15 MB across 6759 installed files
Installed root package: 27.36 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: 27.36 MB (37.9%)
@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 33.7%
🟠 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                            [########################] 14.10 MB 49.1%

Installed footprint breakdown

Installed package size
🔴 eve                             [########################] 27.36 MB 37.9%
🔴 @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: 110.56 MB across 8635 installed files
Installed packages: 121 total (115 transitive-only)
dependencies: 4 direct packages totaling 43.20 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: 27.36 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                              [########################] 27.36 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-0.31.0.tgz`	27.36 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     [########################] 8.52 MB 50.0%
🔴 functions/__server.func                         [########################] 8.52 MB 50.0%

Top Function Payloads

🟠 functions/.well-known/workflow/v1/flow.func • 1 public route • 8.52 MB

Metric	Value
Public routes	`/.well-known/workflow/v1/flow`
Runtime	`nodejs24.x`
Handler	`index.mjs`
Payload	8.52 MB
Function files	8.52 MB across 44 files
Traced dependencies	0 B
Signal	🟠 Bundled file `index.mjs` is 2.34 MB (27.4%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 index.mjs                       [########################] 2.34 MB 27.4%
🟠 _chunks/runtime-artifacts.mjs   [################........] 1.62 MB 19.0%
🟡 _libs/undici.mjs                [##########..............] 980.5 kB 11.5%
🟡 _chunks/sandbox.mjs             [########................] 769.0 kB 9.0%
🟡 _libs/@ai-sdk/gateway+[...].mjs [####....................] 432.8 kB 5.1%
🟠 Other bundled files             [########################] 2.38 MB 28.0%

🧾 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 • 12 public routes, 1 internal alias • 8.52 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/[sessionId]` `/eve/v1/session/[sessionId]/cancel` `/eve/v1/session/[sessionId]/clear` `/eve/v1/session/[sessionId]/compact` `/eve/v1/session/[sessionId]/reset` `/eve/v1/session/[sessionId]/stream`
Internal aliases	`/__server`
Runtime	`nodejs24.x`
Handler	`index.mjs`
Payload	8.52 MB
Function files	8.52 MB across 44 files
Traced dependencies	0 B
Signal	🟠 Bundled file `index.mjs` is 2.34 MB (27.4%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 index.mjs                       [########################] 2.34 MB 27.4%
🟠 _chunks/runtime-artifacts.mjs   [################........] 1.62 MB 19.0%
🟡 _libs/undici.mjs                [##########..............] 980.5 kB 11.5%
🟡 _chunks/sandbox.mjs             [########................] 769.0 kB 9.0%
🟡 _libs/@ai-sdk/gateway+[...].mjs [####....................] 432.8 kB 5.1%
🟠 Other bundled files             [########################] 2.38 MB 28.0%

🧾 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: 2.05 s -> 2.18 s (+131.5 ms) vs tasks/01-flag (a807560).
Timing is informational: shared GitHub runners are too variable for a hard timing budget.

Detailed phase timings vs `tasks/01-flag (a807560)`

Phase	Baseline	Current	Delta
`extension.check`	9.2 ms	9.2 ms	0.0 ms
`project.resolve`	3.5 ms	5.7 ms	+2.2 ms
`workspace.create`	1.1 ms	3.5 ms	+2.4 ms
`host.prepare`	198.0 ms	240.7 ms	+42.7 ms
`vercel.service-prefix.resolve`	2.5 ms	1.9 ms	-0.6 ms
`nitro.create`	204.9 ms	213.2 ms	+8.3 ms
`sandbox.prewarm`	262.2 ms	282.1 ms	+19.9 ms
`nitro.cache.prepare`	0.3 ms	0.3 ms	0.0 ms
`nitro.prepare`	0.9 ms	0.9 ms	0.0 ms
`nitro.public-assets`	0.7 ms	0.8 ms	+0.1 ms
`nitro.prerender`	0.5 ms	0.6 ms	+0.1 ms
`nitro.bundle`	1.33 s	1.39 s	+56.6 ms
`nitro.cache.write`	0.4 ms	0.5 ms	+0.1 ms
`vercel.workflow-function.materialize`	23.8 ms	23.3 ms	-0.5 ms
`agent-summary.emit`	0.6 ms	0.6 ms	0.0 ms
`nitro.close`	0.2 ms	0.1 ms	-0.1 ms
`output.publish`	3.6 ms	3.7 ms	+0.1 ms
`workspace.remove`	2.1 ms	2.4 ms	+0.3 ms

Adds the packages/eve/src/tasks module cluster for experimental.tasks: the TaskStatus/TaskView/TaskOutput contract, the pure lifecycle transition function (terminal is final, failed carries its error output, working <-> input_required), the eve.tasks session index that holds each task's private command token, and replay-idempotent task ids derived from the agent-handle operation-id derivation. The durable task run is a small stable-named workflow that is the single writer for one task's lifecycle: it consumes commands over a private hook, applies the transition function, and appends a full TaskView snapshot per accepted command to its eve.task run stream. Node-side controls (start, command, tail-read, ready-wait) compose inside dispatch and tool steps. Nothing references these modules yet; no runtime behavior changes. Signed-off-by: Rui Conti <ruiconti@gmail.com>

ruiconti · 2026-08-07T06:00:07Z

Superseded by #1771, which carries the final task/index/transport shape before any writer exists.

This was referenced Aug 1, 2026

feat(eve): add flag-gated task tools, undiscoverable by default #1519

Closed

feat(eve): add the experimental.tasks flag, plumbing only #1517

Closed

vercel Bot deployed to Preview – eve-docs August 1, 2026 20:31 View deployment

ruiconti force-pushed the tasks/02-foundation branch from 8b82f56 to bea6c0e Compare August 1, 2026 22:13

vercel Bot deployed to Preview – eve-docs-4759 August 1, 2026 22:14 View deployment

vercel Bot deployed to Preview – eve-docs August 1, 2026 22:15 View deployment

ruiconti force-pushed the tasks/01-flag branch from e789507 to a807560 Compare August 5, 2026 18:41

ruiconti force-pushed the tasks/02-foundation branch from bea6c0e to c0378f6 Compare August 5, 2026 18:41

vercel Bot deployed to Preview – eve-docs-4759 August 5, 2026 18:42 View deployment

vercel Bot deployed to Preview – eve-docs August 5, 2026 18:42 View deployment

ruiconti force-pushed the tasks/02-foundation branch from c0378f6 to 3e7e503 Compare August 7, 2026 03:35

vercel Bot deployed to Preview – eve-docs-4759 August 7, 2026 03:36 View deployment

vercel Bot deployed to Preview – eve-docs August 7, 2026 03:36 View deployment

ruiconti closed this Aug 7, 2026

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feat(eve): add the durable task foundation, inert - #1518

feat(eve): add the durable task foundation, inert#1518
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Package Details

`eve init` install details

Payload Size Graph

Top Function Payloads

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Data flow

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

Delta vs tasks/01-flag (a807560)

eve init install

Package Details

eve init install details

Payload Size Graph

Top Function Payloads

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

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

Delta vs `tasks/01-flag (a807560)`

`eve init` install

`eve init` install details

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