feat(eve): relay remote subagent progress on the best-effort lane

[ruiconti]

Implements the progress lane for #1170 — the one lane that genuinely needs to stay off the main run's replay journal. Stacked on #1207 (remote authorization, durable path).

What

A remote callee's non-terminal progress — message.*, reasoning.*, step.* — now surfaces on the caller's stream wrapped as subagent.event:

• Callee forwards each progress event to the caller's :events ingestion URL (notifyUrl, baked into the dispatch callback metadata) — session-callback-progress.ts, best-effort, swallows POST failures.
• Caller route (:events branch) validates the progress event, wraps it as subagent.event (with childSessionId), and appends it to the caller's durable stream via world.streams.write — no run, no hook, no resume. Followers (TUI, clients) read it off the stream.

Why this lane exists (the plain reason)

High-frequency progress must never ride resumeHook, because every resume replays the main run's journal — and inflating that with progress deltas is exactly what the two-lane split prevents (#1205). So progress takes the best-effort append path, off the main run entirely. Contrast authorization (#1207): low-frequency control, so it does ride the durable resumeHook path like a local subagent. Same wire envelope, opposite lanes, by frequency.

This is #1204's route-direct mechanism — restored for its correct purpose. #1204 aimed it at authorization (wrong: authorization is control); here it carries progress (right).

Scope / deferred

• Delivery is fire-once, drop-ok: a closed stream (finished session) logs and drops. Correct for rendering-only telemetry.
• Progress data rides loosely (allow-listed by type, not re-validated per shape) — it drives no state.
• childSessionId added to SubagentChildEventStreamEvent; this trips the rule-36 capability-epoch ceremony (deferred, known-red on the stack).
• e2e evals for progress + authorization are the next step (the fixture exercises both lanes); unit coverage — route append/reject + dispatch metadata, 45 tests across the touched files — is green.
• Local-subagent progress relay (child → parent stream directly) is a natural follow-up on the same mechanism; this PR does the remote lane.

Full unit suite green (5370); lint clean; guard:invariants red only on the deferred epoch ceremony.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
eve-docs	Ready	Preview, Comment, Open in v0	Jul 25, 2026 3:03am
eve-docs-1644	Ready	Preview, Comment, Open in v0	Jul 25, 2026 3:03am
eve-docs-4759	Ready	Preview, Comment, Open in v0	Jul 25, 2026 3:03am

[github-actions]

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

Key takeaways

• No notable deltas vs rui/remote-authorization-durable (7806612).

Delta vs rui/remote-authorization-durable (7806612)

Area	Metric	Baseline	Current	Delta
Package	Packed tarball	4.04 MB	4.05 MB	+1.7 kB ⚠️
Package	Unpacked publish size	14.71 MB	14.72 MB	+6.5 kB ⚠️
Package	Installed footprint	53.87 MB	53.87 MB	+6.5 kB ⚠️
Package	Published files	2747	2751	+4
Package	Installed files	5987	5991	+4
Runtime	Unique function payloads	2	2	0
Runtime	Total function bytes	11.67 MB	11.68 MB	+5.7 kB ⚠️
Runtime	Public routes	10	10	0

Changed function payloads vs rui/remote-authorization-durable (7806612) (2)

Function	Status	Baseline	Current	Delta	Route changes
functions/.well-known/workflow/v1/flow.func	changed	7.27 MB	7.27 MB	+3.4 kB ⚠️	none
functions/__server.func	changed	4.41 MB	4.41 MB	+2.3 kB ⚠️	none

eve init install

Metric	Baseline	Current	Delta
Installed footprint	92.27 MB	92.28 MB	+6.5 kB ⚠️
Installed packages	122	122	0
dependencies	4	4	0
devDependencies	2	2	0
Dependency package bytes	28.99 MB	29.00 MB	+6.5 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: 2026-07-25T03:04:30.959Z
• 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@0.27.3
• Package directory: packages/eve
• Tarball: 4.05 MB (eve-0.27.3.tgz)
• Unpacked payload: 14.72 MB across 2751 published files
• Installed footprint: 53.87 MB across 5991 installed files
• Installed root package: 13.43 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: 13.43 MB (24.9%)
• ai: 6.43 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 10.2%
🟡 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                            [########################] 11.26 MB 76.5%

Installed footprint breakdown

Installed package size
🔴 @rolldown/binding-linux-x64-gnu [########################] 18.96 MB 35.2%
🔴 eve                             [#################.......] 13.43 MB 24.9%
🔴 ai                              [########................] 6.43 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 12.5%

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: 92.28 MB across 7859 installed files
• Installed packages: 122 total (116 transitive-only)
• dependencies: 4 direct packages totaling 29.00 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: 13.43 MB (14.6%)
• zod: 9.00 MB (9.8%)
• 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                              [############............] 13.43 MB 14.6%
🔴 zod                              [########................] 9.00 MB 9.8%
🔴 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-0.27.3.tgz	13.43 MB	14.6%
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     [########################] 7.27 MB 62.3%
🟠 functions/__server.func                         [###############.........] 4.41 MB 37.7%

Top Function Payloads

🟠 functions/.well-known/workflow/v1/flow.func • 1 public route • 7.27 MB

Metric	Value
Public routes	/.well-known/workflow/v1/flow
Runtime	nodejs24.x
Handler	index.mjs
Payload	7.27 MB
Function files	7.27 MB across 39 files
Traced dependencies	0 B
Signal	🟠 Bundled file __eve_nitro_handler__.mjs is 2.71 MB (37.3%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 __eve_nitro_handler__.mjs       [########################] 2.71 MB 37.3%
🟡 _chunks/world-vercel.mjs        [########................] 903.2 kB 12.4%
🟡 _chunks/sandbox.mjs             [#######.................] 767.6 kB 10.6%
🟡 _libs/@ai-sdk/gateway+[...].mjs [####....................] 432.5 kB 5.9%
🟡 _chunks/token-util-B6qBs3-0.mjs [###.....................] 379.1 kB 5.2%
🟠 Other bundled files             [##################......] 2.08 MB 28.6%

🧾 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 • 4.41 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	4.41 MB
Function files	4.41 MB across 30 files
Traced dependencies	0 B
Signal	🟠 Bundled file _chunks/runtime-artifacts.mjs is 1.41 MB (32.1%)

🟠 🔎 Dependency Analysis

📦 Bundled files:

Bundled file size
🟠 _chunks/runtime-artifacts.mjs   [########################] 1.41 MB 32.1%
🟠 _chunks/world-vercel.mjs        [###############.........] 900.3 kB 20.4%
🟠 _chunks/sandbox.mjs             [#############...........] 767.6 kB 17.4%
🟡 _chunks/token-util-B6qBs3-0.mjs [######..................] 379.1 kB 8.6%
🟡 _chunks/dist-BX517Nmz.mjs       [######..................] 348.7 kB 7.9%
🟡 Other bundled files             [##########..............] 597.9 kB 13.6%

🧾 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 -> 2.92 s (+151.1 ms) vs rui/remote-authorization-durable (7806612).
• Timing is informational: shared GitHub runners are too variable for a hard timing budget.

Detailed phase timings vs `rui/remote-authorization-durable (7806612)`

Phase	Baseline	Current	Delta
extension.check	1.2 ms	9.6 ms	+8.4 ms
project.resolve	0.7 ms	1.5 ms	+0.8 ms
workspace.create	0.8 ms	1.4 ms	+0.6 ms
host.prepare	296.9 ms	217.8 ms	-79.1 ms
vercel.service-prefix.resolve	2.3 ms	2.4 ms	+0.1 ms
nitro.app.create	26.0 ms	27.6 ms	+1.6 ms
nitro.app.cache.prepare	0.3 ms	0.3 ms	0.0 ms
nitro.app.prepare	1.0 ms	1.0 ms	0.0 ms
nitro.app.public-assets	0.7 ms	0.8 ms	+0.1 ms
nitro.app.prerender	0.6 ms	0.6 ms	0.0 ms
nitro.app.bundle	704.8 ms	756.6 ms	+51.8 ms
nitro.app.cache.write	0.4 ms	0.4 ms	0.0 ms
sandbox.prewarm	301.9 ms	444.3 ms	+142.4 ms
nitro.flow.create	168.4 ms	194.7 ms	+26.3 ms
nitro.flow.cache.prepare	0.2 ms	0.2 ms	0.0 ms
nitro.flow.prepare	0.9 ms	0.9 ms	0.0 ms
nitro.flow.public-assets	0.2 ms	0.2 ms	0.0 ms
nitro.flow.prerender	0.0 ms	0.0 ms	0.0 ms
nitro.flow.bundle	1.06 s	1.08 s	+13.4 ms
nitro.flow.cache.write	0.3 ms	0.4 ms	+0.1 ms
nitro.flow.close	0.2 ms	0.2 ms	0.0 ms
workflow.emit	182.0 ms	172.3 ms	-9.7 ms
agent-summary.emit	0.6 ms	0.6 ms	0.0 ms
nitro.app.close	0.1 ms	0.1 ms	0.0 ms
output.publish	9.6 ms	3.9 ms	-5.7 ms
workspace.remove	5.8 ms	5.7 ms	-0.1 ms