Avoid retrying incompatible session handoffs by karthikscale3 · Pull Request #4032 · vercel/eve

karthikscale3 · 2026-09-30T05:37:29Z

Summary

Session handoffs currently retry when a target deployment cannot read the checkpoint, delaying the turn. This change returns an explicit incompatibility so the current owner can process the turn without validation retries, and compatible owners remember rejected deployments. Owners started on older eve builds still attempt handoff each turn, but each attempt no longer retries validation.

Validation

Focused unit tests: 24 passed
Focused integration tests: 5 passed
oxlint, oxfmt --check, and git diff --check passed for the changed files
Full package typecheck remains blocked by existing errors in unchanged src/evals/judge.test.ts

Checklist

This change was requested or approved by a maintainer
I ran the relevant checks from CONTRIBUTING.md
I added tests and documentation where relevant
I added a changeset if this touches the published eve package
DCO sign-off passes for every commit (git commit --signoff)

…t target Signed-off-by: Karthik Kalyanaraman <karthik.kalyanaraman@vercel.com> Co-authored-by: Cursor <cursoragent@cursor.com>

vercel · 2026-09-30T05:37:35Z

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Project	Deployment	Actions	Updated
eve-docs	Ready	Preview, v0	Sep 30, 2026 5:39am UTC
eve-pkg	Ready	Preview, v0	Sep 30, 2026 5:39am UTC

github-actions · 2026-09-30T05:44:09Z

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

Key takeaways

No notable deltas vs main (a7b0fb2).

Delta vs `main (a7b0fb2)`

Area	Metric	Baseline	Current	Delta
Package	Packed tarball	8.43 MB	8.43 MB	+311 B ⚠️
Package	Unpacked publish size	30.96 MB	30.96 MB	+1.4 kB ⚠️
Package	Installed footprint	77.35 MB	77.35 MB	+1.4 kB ⚠️
Package	Published files	3898	3898	0
Package	Installed files	7877	7877	0
Package	Installed package instances	33	33	0
Package	Distinct installed package names	32	32	0
Package	Installed dependency edges	51	51	0
Package	Installed optional peer edges	9	9	0
Runtime	Unique function payloads	2	2	0
Runtime	Total function bytes	19.08 MB	19.09 MB	+8.5 kB ⚠️
Runtime	Public routes	17	17	0

Changed function payloads vs main (a7b0fb2) (2)

Function	Status	Baseline	Current	Delta	Route changes
`functions/__server.func`	changed	9.54 MB	9.55 MB	+4.3 kB ⚠️	none
`functions/.well-known/workflow/v1/flow.func`	changed	9.54 MB	9.55 MB	+4.3 kB ⚠️	none

`eve init` install

Metric	Baseline	Current	Delta
Installed footprint	115.65 MB	115.65 MB	+1.4 kB ⚠️
Installed packages	97	97	0
dependencies	4	4	0
devDependencies	2	2	0
Dependency package bytes	48.33 MB	48.33 MB	+1.4 kB ⚠️
devDependency package bytes	5.11 MB	5.11 MB	0 B ➖

Build Metadata

Preset: vercel
Nitro: nitro@3.0.260903-beta
Output directory: apps/fixtures/weather-agent/.vercel/output
Build metadata timestamp: 2026-09-30T05:43:35.306Z
Route aliases: 17 public, 1 internal (18 total aliases)
Vercel routes in config: 20
Severity legend: 🔴 dominant/large, 🟠 notable, 🟡 watch, ⚪ small

Package Drill-Down

Package Details

Package: eve@0.68.0
Package directory: packages/eve
Tarball: 8.43 MB (eve-0.68.0.tgz)
Unpacked payload: 30.96 MB across 3898 published files
Installed footprint: 77.35 MB across 7877 installed files
Installed root package: 30.67 MB
Installed dependencies: 46.68 MB
Installed package instances: 33
Distinct installed package names: 32
Installed dependency edges: 51
Installed optional peer edges: 9
Runtime dependencies: 2
Peer dependencies: 7 (6 optional)

Installed footprint is measured from an isolated temporary npm install of the packed tarball.
Graph metrics read only package.json files in package directories directly beneath a node_modules boundary, including nested boundaries. Each directory is one package instance; distinct names come from those manifests. Dependency edges count each unique name in dependencies or optionalDependencies per instance; optional peer edges count peerDependencies marked optional.

Heavy installed dependencies

eve: 30.67 MB (39.7%)
@rolldown/binding-linux-x64-gnu: 19.15 MB (24.8%)
ai: 7.71 MB (10.0%)
zod: 6.14 MB (7.9%)
undici: 3.52 MB (4.6%)

Publish payload breakdown

Published file size
🔴 dist/src/compiled/shadcn-registry/index.js       [##############..........] 9.70 MB 31.3%
🟠 dist/src/compiled/@photon-ai/chat-adapter-ime... [###.....................] 2.29 MB 7.4%
🟠 dist/src/compiled/@ai-sdk/code-mode/index.js     [#.......................] 1.03 MB 3.3%
🟡 dist/src/compiled/@vercel/blob/index.js          [#.......................] 604.9 kB 2.0%
🟡 dist/src/compiled/_chunks/workflow/signal-exi... [#.......................] 514.5 kB 1.7%
🔴 Other published files                            [########################] 16.83 MB 54.3%

Installed footprint breakdown

Installed package size
🔴 eve                             [########################] 30.67 MB 39.7%
🔴 @rolldown/binding-linux-x64-gnu [###############.........] 19.15 MB 24.8%
🔴 ai                              [######..................] 7.71 MB 10.0%
🔴 zod                             [#####...................] 6.14 MB 7.9%
🟠 undici                          [###.....................] 3.52 MB 4.6%
🟠 nitro                           [#.......................] 1.89 MB 2.4%
🔴 Other installed packages        [######..................] 8.27 MB 10.7%

Runtime dependencies (2)

Package	Range	Notes
`nitro`	`3.0.260903-beta`
`undici`	`8.9.0`

Peer dependencies (7)

Package	Range	Notes
`@opentelemetry/api`	`^1.0.0`	optional peer
`ai`	`catalog:`
`braintrust`	`^3.0.0`	optional peer
`chat`	`^4.41.0`	optional peer
`dd-trace`	`^6.13.0`	optional peer
`just-bash`	`^3.1.0`	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: 115.65 MB across 9772 installed files
Installed packages: 97 total (91 transitive-only)
dependencies: 4 direct packages totaling 48.33 MB
devDependencies: 2 direct packages totaling 5.11 MB
Other transitive package files: 62.20 MB

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

Heavy installed dependencies

eve: 30.67 MB (26.5%)
@typescript/typescript-linux-x64: 27.95 MB (24.2%)
@rolldown/binding-linux-x64-gnu: 19.15 MB (16.6%)
zod: 9.76 MB (8.4%)
ai: 7.71 MB (6.7%)

Installed footprint breakdown

Installed package size
🔴 eve                              [########################] 30.67 MB 26.5%
🔴 @typescript/typescript-linux-x64 [######################..] 27.95 MB 24.2%
🔴 @rolldown/binding-linux-x64-gnu  [###############.........] 19.15 MB 16.6%
🔴 zod                              [########................] 9.76 MB 8.4%
🔴 ai                               [######..................] 7.71 MB 6.7%
🟠 undici                           [###.....................] 3.52 MB 3.0%
🔴 Other installed packages         [#############...........] 16.90 MB 14.6%

dependencies (4)

Package	Range	Installed size	Share
`@vercel/connect`	`2.2.0`	194.7 kB	0.2%
`ai`	`^7.0.105`	7.71 MB	6.7%
`eve`	`file:eve-0.68.0.tgz`	30.67 MB	26.5%
`zod`	`4.5.4`	9.76 MB	8.4%

devDependencies (2)

Package	Range	Installed size	Share
`@types/node`	`24.x`	2.61 MB	2.3%
`typescript`	`7.0.2`	2.50 MB	2.2%

Function Drill-Down

Payload Size Graph

Unique function payload size and share of total
🔴 functions/.well-known/workflow/v1/flow.func     [########################] 9.55 MB 50.0%
🔴 functions/__server.func                         [########################] 9.55 MB 50.0%

Top Function Payloads

🟠 functions/.well-known/workflow/v1/flow.func • 1 public route • 9.55 MB

Metric	Value
Public routes	`/.well-known/workflow/v1/flow`
Runtime	`nodejs24.x`
Handler	`index.mjs`
Payload	9.55 MB
Function files	9.55 MB across 111 files
Traced dependencies	0 B
Signal	🟠 Bundled file `_chunks/vercel.web.mjs` is 2.16 MB (22.6%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 _chunks/vercel.web.mjs                         [############............] 2.16 MB 22.6%
🟡 _libs/undici.mjs                               [######..................] 980.8 kB 10.3%
🟡 _chunks/sandbox.mjs                            [#####...................] 811.4 kB 8.5%
🟡 _chunks/compiled-artifacts-instrumentation.mjs [####....................] 756.3 kB 7.9%
🟡 _chunks/signal-exit-DZKTacNU.mjs               [###.....................] 616.2 kB 6.5%
🔴 Other bundled files                            [########################] 4.23 MB 44.3%

🧾 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 • 16 public routes, 1 internal alias • 9.55 MB

Metric	Value
Public routes	`/` `/.well-known/workflow/v1/webhook/[token]` `/eve/v1/activity/[token]` `/eve/v1/callback/[token]` `/eve/v1/connections/[name]/callback/[attemptId]/[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]/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	9.55 MB
Function files	9.55 MB across 111 files
Traced dependencies	0 B
Signal	🟠 Bundled file `_chunks/vercel.web.mjs` is 2.16 MB (22.6%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 _chunks/vercel.web.mjs                         [############............] 2.16 MB 22.6%
🟡 _libs/undici.mjs                               [######..................] 980.8 kB 10.3%
🟡 _chunks/sandbox.mjs                            [#####...................] 811.4 kB 8.5%
🟡 _chunks/compiled-artifacts-instrumentation.mjs [####....................] 756.3 kB 7.9%
🟡 _chunks/signal-exit-DZKTacNU.mjs               [###.....................] 616.2 kB 6.5%
🔴 Other bundled files                            [########################] 4.23 MB 44.3%

🧾 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: 2.77 s -> 2.79 s (+26.6 ms) vs main (a7b0fb2).
Timing is informational: shared GitHub runners are too variable for a hard timing budget.

Detailed phase timings vs `main (a7b0fb2)`

Phase	Baseline	Current	Delta
`extension.check`	5.9 ms	12.7 ms	+6.8 ms
`project.resolve`	2.9 ms	0.7 ms	-2.2 ms
`workspace.create`	3.1 ms	1.6 ms	-1.5 ms
`host.prepare`	512.1 ms	492.2 ms	-19.9 ms
`vercel.service-prefix.resolve`	0.9 ms	0.9 ms	0.0 ms
`nitro.create`	352.6 ms	365.0 ms	+12.4 ms
`sandbox.prewarm`	273.4 ms	338.0 ms	+64.6 ms
`nitro.cache.prepare`	0.2 ms	0.2 ms	0.0 ms
`nitro.prepare`	0.5 ms	0.4 ms	-0.1 ms
`nitro.public-assets`	0.6 ms	0.6 ms	0.0 ms
`nitro.prerender`	0.3 ms	0.3 ms	0.0 ms
`nitro.bundle`	1.46 s	1.46 s	+5.5 ms
`nitro.cache.write`	0.2 ms	0.2 ms	0.0 ms
`vercel.workflow-function.materialize`	62.2 ms	41.6 ms	-20.6 ms
`agent-summary.emit`	0.5 ms	0.5 ms	0.0 ms
`connect-manifest.emit`	0.2 ms	0.2 ms	0.0 ms
`nitro.close`	0.1 ms	0.1 ms	0.0 ms
`output.publish`	2.3 ms	3.1 ms	+0.8 ms
`workspace.remove`	1.5 ms	1.4 ms	-0.1 ms

fix(session): stop retrying and re-attempting an unreadable checkpoin…

4d977a5

…t target Signed-off-by: Karthik Kalyanaraman <karthik.kalyanaraman@vercel.com> Co-authored-by: Cursor <cursoragent@cursor.com>

karthikscale3 requested a review from AndrewBarba September 30, 2026 05:39

vercel Bot deployed to Preview – eve-docs September 30, 2026 05:39 View deployment

vercel Bot deployed to Preview – eve-pkg September 30, 2026 05:39 View deployment

AndrewBarba approved these changes Sep 30, 2026

View reviewed changes

AndrewBarba merged commit f9c785f into main Sep 30, 2026
182 of 184 checks passed

AndrewBarba deleted the fix/remember-checkpoint-incompatible-deployment branch September 30, 2026 12:10

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Avoid retrying incompatible session handoffs - #4032

Avoid retrying incompatible session handoffs#4032
AndrewBarba merged 1 commit into
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fix/remember-checkpoint-incompatible-deployment

karthikscale3 commented Sep 30, 2026

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Package Details

`eve init` install details

Payload Size Graph

Top Function Payloads

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karthikscale3 commented Sep 30, 2026

Summary

Validation

Checklist

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github-actions Bot commented Sep 30, 2026

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

Delta vs main (a7b0fb2)

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 `main (a7b0fb2)`

`eve init` install

`eve init` install details

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