fix(eve): cancel durable turns from generated Web Chat

[remiconnesson]

Summary

• retain completed generated Web Chat sessions for normal follow-up messages
• replace Stop's browser-only agent.stop() path with guarded session.cancel({ turnId })
• document the durable cancellation pattern and add scaffold regression coverage

Root cause

The generated Stop button aborted the client stream only, leaving the server-side turn running. It also did not preserve completed session cursors for normal follow-up messages.

Verification

• fresh local generated-app browser proof (not a deployed Vercel project): packed this branch into an eve tarball, ran eve init, then ran eve channels add web --yes
  • Stop sent POST /eve/v1/session/<sessionId>/cancel with the active turnId and received accepted
  • the durable stream emitted turn.cancelled then session.waiting
  • RESUMED-OK after cancellation and CONTINUED-OK after a normal completion both reused the same session ID
• cancellation E2E passed for local and Vercel fixtures with OpenAI and Anthropic

Relates to #124.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
eve-docs	Ready	Preview, Comment	Jul 21, 2026 9:59pm
eve-docs-1644	Ready	Preview, Comment, Open in v0	Jul 21, 2026 9:59pm
eve-docs-4759	Ready	Preview, Comment, Open in v0	Jul 21, 2026 9:59pm

[github-actions]

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

Key takeaways

• No notable deltas vs main (a75496c).

Delta vs main (a75496c)

Area	Metric	Baseline	Current	Delta
Package	Packed tarball	4.01 MB	4.01 MB	+1.7 kB ⚠️
Package	Unpacked publish size	14.60 MB	14.61 MB	+5.6 kB ⚠️
Package	Installed footprint	53.73 MB	53.74 MB	+5.6 kB ⚠️
Package	Published files	2729	2729	0
Package	Installed files	5969	5969	0
Runtime	Unique function payloads	2	2	0
Runtime	Total function bytes	11.62 MB	11.62 MB	-40 B ✅
Runtime	Public routes	10	10	0

Changed function payloads vs main (a75496c) (2)

Function	Status	Baseline	Current	Delta	Route changes
functions/__server.func	changed	4.40 MB	4.40 MB	-20 B ✅	none
functions/.well-known/workflow/v1/flow.func	changed	7.23 MB	7.23 MB	-20 B ✅	none

eve init install

Metric	Baseline	Current	Delta
Installed footprint	92.13 MB	92.14 MB	+5.6 kB ⚠️
Installed packages	122	122	0
dependencies	4	4	0
devDependencies	2	2	0
Dependency package bytes	28.86 MB	28.86 MB	+5.6 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: 2026-07-21T21:59:54.611Z
• Route aliases: 10 public, 1 internal (11 total aliases)
• Vercel routes in config: 11
• Severity legend: 🔴 dominant/large, 🟠 notable, 🟡 watch, ⚪ small

Package Drill-Down

Package Details

• Package: eve@0.27.0
• Package directory: packages/eve
• Tarball: 4.01 MB (eve-0.27.0.tgz)
• Unpacked payload: 14.61 MB across 2729 published files
• Installed footprint: 53.74 MB across 5969 installed files
• Installed root package: 13.33 MB
• Installed dependencies: 40.41 MB
• Runtime dependencies: 1
• Peer dependencies: 5 (4 optional)

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

Heavy installed dependencies

• @rolldown/binding-linux-x64-gnu: 18.96 MB (35.3%)
• eve: 13.33 MB (24.8%)
• ai: 6.40 MB (11.9%)
• zod: 5.04 MB (9.4%)
• nitro: 2.41 MB (4.5%)

Publish payload breakdown

Published file size
🟠 dist/src/compiled/experimental-ai-sdk-code-mo... [###.....................] 1.51 MB 10.3%
🟡 dist/src/compiled/@vercel/sandbox/index.js       [#.......................] 632.4 kB 4.3%
🟡 dist/src/compiled/_chunks/workflow/undici-C2Z... [#.......................] 502.4 kB 3.4%
🟡 dist/src/compiled/@chat-adapter/slack/index.js   [#.......................] 440.5 kB 3.0%
🟡 dist/src/compiled/@vercel/oidc/index.js          [#.......................] 379.5 kB 2.6%
🔴 Other published files                            [########################] 11.15 MB 76.3%

Installed footprint breakdown

Installed package size
🔴 @rolldown/binding-linux-x64-gnu [########################] 18.96 MB 35.3%
🔴 eve                             [#################.......] 13.33 MB 24.8%
🔴 ai                              [########................] 6.40 MB 11.9%
🔴 zod                             [######..................] 5.04 MB 9.4%
🟠 nitro                           [###.....................] 2.41 MB 4.5%
🟡 @ai-sdk/provider-utils          [#.......................] 852.0 kB 1.6%
🔴 Other installed packages        [#########...............] 6.75 MB 12.6%

Runtime dependencies (1)

Package	Range	Notes
nitro	3.0.260610-beta

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: 92.14 MB across 7837 installed files
• Installed packages: 122 total (116 transitive-only)
• dependencies: 4 direct packages totaling 28.86 MB
• devDependencies: 2 direct packages totaling 5.04 MB
• Other transitive package files: 58.24 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 (30.3%)
• @rolldown/binding-linux-x64-gnu: 18.96 MB (20.6%)
• eve: 13.33 MB (14.5%)
• zod: 9.00 MB (9.8%)
• ai: 6.40 MB (7.0%)

Installed footprint breakdown

Installed package size
🔴 @typescript/typescript-linux-x64 [########################] 27.95 MB 30.3%
🔴 @rolldown/binding-linux-x64-gnu  [################........] 18.96 MB 20.6%
🔴 eve                              [###########.............] 13.33 MB 14.5%
🔴 zod                              [########................] 9.00 MB 9.8%
🔴 ai                               [######..................] 6.40 MB 7.0%
🟠 @types/node                      [##......................] 2.54 MB 2.8%
🔴 Other installed packages         [############............] 13.96 MB 15.2%

dependencies (4)

Package	Range	Installed size	Share
@vercel/connect	0.4.2	135.8 kB	0.1%
ai	^7.0.34	6.40 MB	7.0%
eve	file:eve-0.27.0.tgz	13.33 MB	14.5%
zod	4.4.3	9.00 MB	9.8%

devDependencies (2)

Package	Range	Installed size	Share
@types/node	24.x	2.54 MB	2.8%
typescript	7.0.2	2.50 MB	2.7%

Function Drill-Down

Payload Size Graph

Unique function payload size and share of total
🔴 functions/.well-known/workflow/v1/flow.func     [########################] 7.23 MB 62.2%
🟠 functions/__server.func                         [###############.........] 4.40 MB 37.8%

Top Function Payloads

🟠 functions/.well-known/workflow/v1/flow.func • 1 public route • 7.23 MB

Metric	Value
Public routes	/.well-known/workflow/v1/flow
Runtime	nodejs24.x
Handler	index.mjs
Payload	7.23 MB
Function files	7.23 MB across 39 files
Traced dependencies	0 B
Signal	🟠 Bundled file __eve_nitro_handler__.mjs is 2.68 MB (37.0%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 __eve_nitro_handler__.mjs       [########################] 2.68 MB 37.0%
🟡 _chunks/world-vercel.mjs        [########................] 901.4 kB 12.5%
🟡 _chunks/sandbox.mjs             [#######.................] 767.6 kB 10.6%
🟡 _libs/@ai-sdk/gateway+[...].mjs [####....................] 432.5 kB 6.0%
🟡 _chunks/token-util-B6qBs3-0.mjs [###.....................] 379.1 kB 5.2%
🟠 Other bundled files             [###################.....] 2.07 MB 28.7%

🧾 Vercel Config

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

---

🟠 functions/__server.func • 9 public routes, 1 internal alias • 4.40 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]/stream
Internal aliases	/__server
Runtime	nodejs24.x
Handler	index.mjs
Payload	4.40 MB
Function files	4.40 MB across 30 files
Traced dependencies	0 B
Signal	🟠 Bundled file _chunks/runtime-artifacts.mjs is 1.41 MB (32.0%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 _chunks/runtime-artifacts.mjs   [########################] 1.41 MB 32.0%
🟠 _chunks/world-vercel.mjs        [###############.........] 898.4 kB 20.4%
🟠 _chunks/sandbox.mjs             [#############...........] 767.6 kB 17.5%
🟡 _chunks/token-util-B6qBs3-0.mjs [######..................] 379.1 kB 8.6%
🟡 _chunks/dist-ccp7sq2n.mjs       [######..................] 348.5 kB 7.9%
🟡 Other bundled files             [##########..............] 595.0 kB 13.5%

🧾 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: 2.60 s -> 2.56 s (-46.9 ms) vs main (a75496c).
• Timing is informational: shared GitHub runners are too variable for a hard timing budget.

Detailed phase timings vs `main (a75496c)`

Phase	Baseline	Current	Delta
extension.check	5.9 ms	1.1 ms	-4.8 ms
project.resolve	3.5 ms	0.6 ms	-2.9 ms
workspace.create	1.4 ms	0.8 ms	-0.6 ms
host.prepare	180.4 ms	156.7 ms	-23.7 ms
vercel.service-prefix.resolve	2.7 ms	2.4 ms	-0.3 ms
nitro.app.create	24.7 ms	25.7 ms	+1.0 ms
nitro.app.cache.prepare	0.3 ms	0.3 ms	0.0 ms
nitro.app.prepare	1.1 ms	1.0 ms	-0.1 ms
nitro.app.public-assets	0.8 ms	0.8 ms	0.0 ms
nitro.app.prerender	0.5 ms	0.5 ms	0.0 ms
nitro.app.bundle	661.0 ms	701.6 ms	+40.6 ms
nitro.app.cache.write	0.4 ms	0.4 ms	0.0 ms
sandbox.prewarm	288.4 ms	259.5 ms	-28.9 ms
nitro.flow.create	191.3 ms	166.0 ms	-25.3 ms
nitro.flow.cache.prepare	0.2 ms	0.2 ms	0.0 ms
nitro.flow.prepare	0.7 ms	0.8 ms	+0.1 ms
nitro.flow.public-assets	0.1 ms	0.2 ms	+0.1 ms
nitro.flow.prerender	0.0 ms	0.0 ms	0.0 ms
nitro.flow.bundle	1.06 s	1.05 s	-10.2 ms
nitro.flow.cache.write	0.3 ms	0.3 ms	0.0 ms
nitro.flow.close	0.2 ms	0.2 ms	0.0 ms
workflow.emit	167.7 ms	176.2 ms	+8.5 ms
agent-summary.emit	0.5 ms	0.4 ms	-0.1 ms
nitro.app.close	0.1 ms	0.0 ms	-0.1 ms
output.publish	3.8 ms	3.6 ms	-0.2 ms
workspace.remove	5.6 ms	5.6 ms	0.0 ms