fix(eve): keep a single tool_result per tool-use id in persisted history by ruiconti · Pull Request #1246 · vercel/eve

ruiconti · 2026-07-27T18:38:40Z

Opus 5 turns fail intermittently with:

messages.2.content.2: each tool_use must have a single result. Found multiple `tool_result` blocks with id: toolu_...

A provider-executed tool call (gateway web_search) whose arguments fail to parse comes back with two results for one id:

the provider's own outcome, inline in the assistant message: {"type":"error-json","value":{"error":"invalid_input","message":"JSON parse error..."}}
a separately synthesized AI_InvalidToolInputError tool message from the AI SDK, in result.response.messages

eve persisted both, and the next model call replayed two tool_result blocks for one tool_use — which Anthropic rejects with statusCode 400, isRetryable false, killing the turn.

Scope

This is independent of the raw-JSON-string tool-argument handling in #1240. The tool-call input in the failing case is {} (a valid object), so no coercion path runs and no eve-synthesized error is involved — the AI SDK emits the duplicate itself. The bug is structural: eve assumed one result per tool-use id but never enforced it. Fixing it off main so it lands independently.

Fix

dedupeToolResultsByCallId runs after normalizeProviderToolHistory and keeps the first tool_result/tool_error per tool-use id — the provider's authoritative inline outcome, which precedes any synthesized follow-up — dropping later duplicates and pruning any message left empty. tool-loop logs the dropped ids rather than truncating silently. Untouched messages keep their identity (no needless copies).

Verification

Captured the exact duplicate history from a live Opus 5 web_search eval; the unit test encodes that structure.
Reproduced 4/20 on the live eval before the fix, 0/30 after.
Full unit tier green.

A provider-executed tool call (gateway web_search on Opus 5) whose arguments fail to parse comes back with two results for one id: the provider's own error-json inline in the assistant message, plus a separately synthesized AI_InvalidToolInputError tool message from the AI SDK. eve persisted both, so the next model call failed with 'each tool_use must have a single result. Found multiple tool_result blocks with id'. Reproduced 4/20 on a live Opus 5 web_search eval; 0/30 after the fix. Independent of the malformed-input string handling — the tool-call input here is {} (a valid object), so no coercion path runs; the AI SDK itself emits the duplicate. dedupeToolResultsByCallId keeps the first result per id (the provider's authoritative inline outcome) and prunes emptied messages; tool-loop logs any dropped id rather than truncating silently. Signed-off-by: Rui Conti <ruiconti@gmail.com>

vercel · 2026-07-27T18:39:00Z

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Project	Deployment	Actions	Updated (UTC)
eve-docs	Ready	Preview, Comment, Open in v0	Jul 27, 2026 6:40pm
eve-docs-1644	Ready	Preview, Comment, Open in v0	Jul 27, 2026 6:40pm
eve-docs-4759	Ready	Preview, Comment, Open in v0	Jul 27, 2026 6:40pm

github-actions · 2026-07-27T18:42:02Z

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

Key takeaways

No notable deltas vs main (e368fcd).

Delta vs `main (e368fcd)`

Area	Metric	Baseline	Current	Delta
Package	Packed tarball	4.06 MB	4.06 MB	+935 B ⚠️
Package	Unpacked publish size	14.76 MB	14.76 MB	+1.5 kB ⚠️
Package	Installed footprint	53.91 MB	53.92 MB	+1.5 kB ⚠️
Package	Published files	2776	2776	0
Package	Installed files	6016	6016	0
Runtime	Unique function payloads	2	2	0
Runtime	Total function bytes	14.63 MB	14.63 MB	+1.4 kB ⚠️
Runtime	Public routes	11	11	0

Changed function payloads vs main (e368fcd) (2)

Function	Status	Baseline	Current	Delta	Route changes
`functions/__server.func`	changed	7.32 MB	7.32 MB	+711 B ⚠️	none
`functions/.well-known/workflow/v1/flow.func`	changed	7.32 MB	7.32 MB	+711 B ⚠️	none

`eve init` install

Metric	Baseline	Current	Delta
Installed footprint	92.32 MB	92.32 MB	+1.5 kB ⚠️
Installed packages	122	122	0
dependencies	4	4	0
devDependencies	2	2	0
Dependency package bytes	29.04 MB	29.04 MB	+1.5 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: 2026-07-27T18:41:15.112Z
Route aliases: 11 public, 1 internal (12 total aliases)
Vercel routes in config: 14
Severity legend: 🔴 dominant/large, 🟠 notable, 🟡 watch, ⚪ small

Package Drill-Down

Package Details

Package: eve@0.27.6
Package directory: packages/eve
Tarball: 4.06 MB (eve-0.27.6.tgz)
Unpacked payload: 14.76 MB across 2776 published files
Installed footprint: 53.92 MB across 6016 installed files
Installed root package: 13.48 MB
Installed dependencies: 40.44 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 (35.2%)
eve: 13.48 MB (25.0%)
ai: 6.43 MB (11.9%)
zod: 5.04 MB (9.3%)
nitro: 2.41 MB (4.5%)

Publish payload breakdown

Published file size
🟠 dist/src/compiled/experimental-ai-sdk-code-mo... [###.....................] 1.51 MB 10.2%
🟡 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                            [########################] 11.30 MB 76.6%

Installed footprint breakdown

Installed package size
🔴 @rolldown/binding-linux-x64-gnu [########################] 18.96 MB 35.2%
🔴 eve                             [#################.......] 13.48 MB 25.0%
🔴 ai                              [########................] 6.43 MB 11.9%
🔴 zod                             [######..................] 5.04 MB 9.3%
🟠 nitro                           [###.....................] 2.41 MB 4.5%
🟡 @ai-sdk/provider-utils          [#.......................] 852.0 kB 1.6%
🔴 Other installed packages        [#########...............] 6.75 MB 12.5%

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: 92.32 MB across 7884 installed files
Installed packages: 122 total (116 transitive-only)
dependencies: 4 direct packages totaling 29.04 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 (20.5%)
eve: 13.48 MB (14.6%)
zod: 9.00 MB (9.7%)
ai: 6.43 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 20.5%
🔴 eve                              [############............] 13.48 MB 14.6%
🔴 zod                              [########................] 9.00 MB 9.7%
🔴 ai                               [######..................] 6.43 MB 7.0%
🟠 @types/node                      [##......................] 2.54 MB 2.8%
🔴 Other installed packages         [############............] 13.97 MB 15.1%

dependencies (4)

Package	Range	Installed size	Share
`@vercel/connect`	`0.4.2`	135.8 kB	0.1%
`ai`	`^7.0.34`	6.43 MB	7.0%
`eve`	`file:eve-0.27.6.tgz`	13.48 MB	14.6%
`zod`	`4.4.3`	9.00 MB	9.7%

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     [########################] 7.32 MB 50.0%
🔴 functions/__server.func                         [########################] 7.32 MB 50.0%

Top Function Payloads

🟠 functions/.well-known/workflow/v1/flow.func • 1 public route • 7.32 MB

Metric	Value
Public routes	`/.well-known/workflow/v1/flow`
Runtime	`nodejs24.x`
Handler	`index.mjs`
Payload	7.32 MB
Function files	7.32 MB across 43 files
Traced dependencies	0 B
Signal	🟠 Bundled file `_chunks/runtime-artifacts.mjs` is 1.57 MB (21.5%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 _chunks/runtime-artifacts.mjs   [###############.........] 1.57 MB 21.5%
🟠 index.mjs                       [###########.............] 1.17 MB 16.0%
🟡 _chunks/world-vercel.mjs        [#########...............] 900.3 kB 12.3%
🟡 _chunks/sandbox.mjs             [#######.................] 767.6 kB 10.5%
🟡 _libs/@ai-sdk/gateway+[...].mjs [####....................] 432.5 kB 5.9%
🟠 Other bundled files             [########################] 2.47 MB 33.8%

🧾 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 • 10 public routes, 1 internal alias • 7.32 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` `/eve/v1/session/reset`
Internal aliases	`/__server`
Runtime	`nodejs24.x`
Handler	`index.mjs`
Payload	7.32 MB
Function files	7.32 MB across 43 files
Traced dependencies	0 B
Signal	🟠 Bundled file `_chunks/runtime-artifacts.mjs` is 1.57 MB (21.5%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 _chunks/runtime-artifacts.mjs   [###############.........] 1.57 MB 21.5%
🟠 index.mjs                       [###########.............] 1.17 MB 16.0%
🟡 _chunks/world-vercel.mjs        [#########...............] 900.3 kB 12.3%
🟡 _chunks/sandbox.mjs             [#######.................] 767.6 kB 10.5%
🟡 _libs/@ai-sdk/gateway+[...].mjs [####....................] 432.5 kB 5.9%
🟠 Other bundled files             [########################] 2.47 MB 33.8%

🧾 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: 1.76 s -> 1.76 s (-4.5 ms) vs main (e368fcd).
Timing is informational: shared GitHub runners are too variable for a hard timing budget.

Detailed phase timings vs `main (e368fcd)`

Phase	Baseline	Current	Delta
`extension.check`	12.2 ms	1.1 ms	-11.1 ms
`project.resolve`	6.3 ms	0.6 ms	-5.7 ms
`workspace.create`	6.9 ms	0.8 ms	-6.1 ms
`host.prepare`	167.1 ms	139.6 ms	-27.5 ms
`vercel.service-prefix.resolve`	2.1 ms	2.3 ms	+0.2 ms
`nitro.create`	196.7 ms	209.1 ms	+12.4 ms
`sandbox.prewarm`	247.1 ms	242.5 ms	-4.6 ms
`nitro.cache.prepare`	0.3 ms	0.3 ms	0.0 ms
`nitro.prepare`	0.8 ms	0.8 ms	0.0 ms
`nitro.public-assets`	0.7 ms	0.7 ms	0.0 ms
`nitro.prerender`	0.6 ms	0.6 ms	0.0 ms
`nitro.bundle`	1.12 s	1.15 s	+37.7 ms
`nitro.cache.write`	0.4 ms	0.4 ms	0.0 ms
`agent-summary.emit`	0.5 ms	0.5 ms	0.0 ms
`nitro.close`	0.1 ms	0.2 ms	+0.1 ms
`output.publish`	3.5 ms	3.7 ms	+0.2 ms
`workspace.remove`	2.3 ms	2.4 ms	+0.1 ms

ruiconti · 2026-07-27T19:07:06Z

Fix is upstream vercel/ai#17400.

vercel Bot deployed to Preview – eve-docs-4759 July 27, 2026 18:39 View deployment

vercel Bot deployed to Preview – eve-docs-1644 July 27, 2026 18:39 View deployment

vercel Bot deployed to Preview – eve-docs July 27, 2026 18:40 View deployment

ruiconti marked this pull request as draft July 27, 2026 19:06

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fix(eve): keep a single tool_result per tool-use id in persisted history - #1246

fix(eve): keep a single tool_result per tool-use id in persisted history#1246
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ruiconti commented Jul 27, 2026

Scope

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Verification

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

Delta vs main (e368fcd)

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`

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`eve init` install

`eve init` install details

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