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23 changes: 14 additions & 9 deletions apps/desktop/src/backend/DesktopServerExposure.ts
Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ import {
type DesktopServerExposureState,
} from "@t3tools/contracts";
import { isTailscaleIpv4Address, readTailscaleStatus } from "@t3tools/tailscale";
import * as Cache from "effect/Cache";
import * as Context from "effect/Context";
import * as Duration from "effect/Duration";
import * as Effect from "effect/Effect";
Expand Down Expand Up @@ -422,15 +423,19 @@ export const make = Effect.gen(function* () {

// Cache the `tailscale status` spawn for the TTL. On macOS, the Mac App
// Store Tailscale CLI lives inside Tailscale's sandbox container, so each
// spawn re-triggers the "Other apps" TCC prompt.
const cachedReadMagicDnsName = yield* Effect.cachedWithTTL(
readTailscaleStatus.pipe(
Effect.map((status) => status.magicDnsName),
Effect.orElseSucceed(() => null),
Effect.provideService(ChildProcessSpawner.ChildProcessSpawner, childProcessSpawner),
),
TAILSCALE_STATUS_CACHE_TTL,
);
// spawn re-triggers the "Other apps" TCC prompt. An interrupted spawn is
// not cached, so the next read spawns again.
const magicDnsNameCache = yield* Cache.make({
capacity: 1,
timeToLive: TAILSCALE_STATUS_CACHE_TTL,
lookup: () =>
readTailscaleStatus.pipe(
Effect.map((status) => status.magicDnsName),
Effect.orElseSucceed(() => null),
Effect.provideService(ChildProcessSpawner.ChildProcessSpawner, childProcessSpawner),
),
});
const cachedReadMagicDnsName = Cache.get(magicDnsNameCache, undefined);

const readNetworkInterfaces = networkInterfaces.read;

Expand Down
11 changes: 8 additions & 3 deletions apps/desktop/src/preview/Manager.ts
Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,7 @@ import {
shell,
webContents,
} from "electron";
import * as Cache from "effect/Cache";
import * as Cause from "effect/Cause";
import * as Clock from "effect/Clock";
import * as Context from "effect/Context";
Expand Down Expand Up @@ -644,9 +645,13 @@ const makeNativeOperations = Effect.fn("PreviewManager.makeOperations")(function
const context = yield* Effect.context<never>();
const runFork = Effect.runForkWith(context);
const resolvedArtifactDirectory = path.resolve(artifactDirectory);
const playwrightInstallExpression = yield* Effect.cached(
playwrightInjectedRuntimeInstallExpression(),
);
// Read once per manager. An interrupted read is dropped rather than
// replayed, so the next injection reads the bundle again.
const playwrightInstallExpressionCache = yield* Cache.make({
capacity: 1,
lookup: () => playwrightInjectedRuntimeInstallExpression(),
});
const playwrightInstallExpression = Cache.get(playwrightInstallExpressionCache, undefined);

const annotationThemeRef = yield* Ref.make(DEFAULT_ANNOTATION_THEME);
const mainWindowRef = yield* Ref.make<Option.Option<BrowserWindow>>(Option.none());
Expand Down
14 changes: 12 additions & 2 deletions apps/mobile/src/features/cloud/managedRelayLayer.ts
Original file line number Diff line number Diff line change
@@ -1,7 +1,10 @@
import { ManagedRelay } from "@t3tools/client-runtime/relay";
import { RelayMobileClientId } from "@t3tools/contracts/relay";
import * as Cache from "effect/Cache";
import * as Crypto from "effect/Crypto";
import * as Duration from "effect/Duration";
import * as Effect from "effect/Effect";
import * as Exit from "effect/Exit";
import * as Layer from "effect/Layer";

import { createDpopProof, loadOrCreateDpopProofKeyPair } from "./dpop";
Expand All @@ -11,9 +14,16 @@ const relayDpopSignerLayer = Layer.effect(
ManagedRelay.ManagedRelayDpopSigner,
Effect.gen(function* () {
const crypto = yield* Crypto.Crypto;
const loadProofKey = yield* Effect.cached(
loadOrCreateDpopProofKeyPair().pipe(Effect.provideService(Crypto.Crypto, crypto)),
// Keeps the loaded key for the app's lifetime. A failed or interrupted
// load is not kept, so the next relay request loads it again.
const proofKeyCache = yield* Cache.makeWith(
() => loadOrCreateDpopProofKeyPair().pipe(Effect.provideService(Crypto.Crypto, crypto)),
{
capacity: 1,
timeToLive: (exit) => (Exit.isSuccess(exit) ? Duration.infinity : Duration.zero),
},
);
const loadProofKey = Cache.get(proofKeyCache, undefined);
return ManagedRelay.ManagedRelayDpopSigner.of({
thumbprint: loadProofKey.pipe(
Effect.map((proofKey) => proofKey.thumbprint),
Expand Down
31 changes: 17 additions & 14 deletions apps/server/src/project/ManagedProjectFolders.ts
Original file line number Diff line number Diff line change
Expand Up @@ -11,11 +11,11 @@
*/
import { CommandId, ProjectId, type ThreadId } from "@t3tools/contracts";
import { newProjectFolderName } from "@t3tools/shared/path";
import * as Cache from "effect/Cache";
import * as Cause from "effect/Cause";
import * as Context from "effect/Context";
import * as Crypto from "effect/Crypto";
import * as DateTime from "effect/DateTime";
import * as Duration from "effect/Duration";
import * as Effect from "effect/Effect";
import * as Exit from "effect/Exit";
import * as FileSystem from "effect/FileSystem";
Expand Down Expand Up @@ -259,20 +259,23 @@ const make = Effect.gen(function* () {
// Inside a checkout (a dev worktree's .t3, a dotfiles home) the folder would
// inherit the repo's git status and checkpoints, so Scratch is offered only
// when the data dir is outside any work tree. Probed once; detection
// failures hide Scratch rather than failing callers. An interrupted probe
// invalidates the cache so the next caller probes again.
const [probe, invalidate] = yield* Effect.cachedInvalidateWithTTL(
gitWorkflow.isRepository(config.baseDir).pipe(
Effect.map((isRepository) =>
isRepository ? Option.none<string>() : Option.some(path.resolve(config.baseDir, "scratch")),
),
Effect.catchCause((cause) =>
Cause.hasInterrupts(cause) ? Effect.interrupt : Effect.succeed(Option.none<string>()),
// failures hide Scratch rather than failing callers. `Cache` drops an
// interrupted probe, so the next caller probes again.
const scratchProbe = yield* Cache.make({
capacity: 1,
lookup: () =>
gitWorkflow.isRepository(config.baseDir).pipe(
Effect.map((isRepository) =>
isRepository
? Option.none<string>()
: Option.some(path.resolve(config.baseDir, "scratch")),
),
Effect.catchCause((cause) =>
Cause.hasInterrupts(cause) ? Effect.interrupt : Effect.succeed(Option.none<string>()),
),
),
),
Duration.infinity,
);
const scratchRoot = probe.pipe(Effect.onInterrupt(() => invalidate));
});
const scratchRoot = Cache.get(scratchProbe, undefined);

const makeScratchFolder = (folder: string) =>
fileSystem
Expand Down
51 changes: 28 additions & 23 deletions apps/server/src/provider/ModelManifest.ts
Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ import {
type ServerProviderModel,
} from "@t3tools/contracts";
import { codexModelFamily } from "@t3tools/shared/model";
import * as Cache from "effect/Cache";
import * as Clock from "effect/Clock";
import * as Context from "effect/Context";
import * as Effect from "effect/Effect";
Expand Down Expand Up @@ -350,29 +351,33 @@ export const make = Effect.gen(function* () {
let lastAttemptMs: number | null = null;
const refreshSemaphore = yield* Semaphore.make(1);

// `Effect.cached` makes concurrent first readers await the same disk load
// rather than racing a "loaded" flag. Only `refreshed` takes the fetch
// semaphore; `current` must never wait behind an in-flight network refresh.
const ensureDiskCacheLoaded = yield* Effect.cached(
Effect.gen(function* () {
const fromDisk = yield* fileSystem.readFileString(cachePath).pipe(
Effect.flatMap((raw) => decodeManifestCache(raw)),
Effect.catchCause(() => Effect.succeed(null)),
);
if (fromDisk === null) return;
// The disk copy is the last-seen remote manifest, so it outranks the
// bundle even when stale, unless the bundle's own edit date is newer
// than the cached manifest's. Then the release carries data the cache
// has not seen and the cache is dropped so the next refresh replaces
// it. Comparing edit dates, not fetch time, keeps this independent of
// when the cache was written relative to the release.
if (manifestUpdatedAtMs(BUNDLED_MODEL_MANIFEST) > manifestUpdatedAtMs(fromDisk.manifest)) {
return;
}
manifest = fromDisk.manifest;
fetchedAtMs = fromDisk.fetchedAtMs;
}),
);
// Concurrent first readers await the same disk load rather than racing a
// "loaded" flag, and an interrupted load is dropped so the next reader
// retries it. Only `refreshed` takes the fetch semaphore; `current` must
// never wait behind an in-flight network refresh.
const diskCacheLoad = yield* Cache.make({
capacity: 1,
lookup: () =>
Effect.gen(function* () {
const fromDisk = yield* fileSystem.readFileString(cachePath).pipe(
Effect.flatMap((raw) => decodeManifestCache(raw)),
Effect.catchCause(() => Effect.succeed(null)),
Comment thread
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🩺 Stability & Availability | 🟡 Minor | ⚡ Quick win

🔎 Supported by static analysis

🏁 Script executed:

#!/bin/bash
set -eu

rg -n '"effect"\s*:' apps/server/package.json
fd -i 'lock' . -x rg -n -C 2 'effect' {} || true

Repository: pingdotgg/t3code

Length of output: 41172


🏁 Script executed:

#!/bin/bash
set -eu

printf '%s\n' '--- ModelManifest PR diff ---'
git diff --unified=45 f870c419fc21f7ee23c122e60fb94adb8bf73a40 079c2444c14f2bddbbc556679a8dd2963bef1930 -- apps/server/src/provider/ModelManifest.ts

printf '%s\n' '--- Current ModelManifest lookup ---'
nl -ba apps/server/src/provider/ModelManifest.ts | sed -n '300,390p'

printf '%s\n' '--- Effect patch configuration and candidates ---'
rg -n -F 'effect@4.0.0-rc.115' pnpm-workspace.yaml pnpm-lock.yaml
rg --files | rg '(^|/)(patches?|pnpm-workspace\.yaml)(/|$)|effect.*patch'

Repository: pingdotgg/t3code

Length of output: 36837


🏁 Script executed:

#!/bin/bash
set -eu
printf '%s\n' '--- Applied Effect patch ---'
nl -ba patches/effect@4.0.0-rc.115.patch
printf '%s\n' '--- Patch declaration and lock resolution ---'
nl -ba pnpm-workspace.yaml | sed -n '248,263p'
nl -ba pnpm-lock.yaml | sed -n '1,14p;100,110p;7434,7444p'

Repository: pingdotgg/t3code

Length of output: 22977


🌐 Web query:

Effect 4.0.0-rc.115 Cache interrupted lookup cleanup race 4.0.1 Cache lookup interruption pending entry remove fix GitHub

💡 Result:

The closest match is the **Effect 4 cache interruption cleanup fix**: an interrupted lookup should remove its pending cache entry, so a later lookup can start fresh. The Effect 4 handbook also notes that **rc.113** addressed related cache races, including ensuring synchronously interrupted lookups aren’t retained. ([eugene1g.github.io](https://eugene1g.github.io/effect-handbook/operations/caching-batching?utm_source=openai))

I couldn’t verify a specific GitHub issue or PR tying that fix to **rc.115** or **4.0.1**. The available release page shows Effect **4.0.0** as the first stable v4 release, but doesn’t establish that it includes this particular fix. ([github.com](https://github.com/Effect-TS/effect/releases?utm_source=openai))

Citations:

- 1: https://eugene1g.github.io/effect-handbook/operations/caching-batching?utm_source=openai
- 2: https://github.com/Effect-TS/effect/releases?utm_source=openai

🌐 Web query:

site:github.com/Effect-TS/effect "interrupted" "Cache" "rc.115" cleanup pending lookup

💡 Result:

**Most relevant match:** [Effect-TS/effect’s release notes for rc.115](https://github.com/Effect-TS/effect/releases/tag/effect%404.0.0-rc.115) list two related cache fixes:

- **#6494:** “only interrupt cache lookup when all awaiters are gone.”
- **#7614:** “Prevent `Cache` from retaining synchronously interrupted lookups.” ([packagetrack.dev](https://packagetrack.dev/npm/effect?utm_source=openai))

The current `ScopedCache` source shows the cleanup pattern: it registers an `onExit` handler before awaiting a pending lookup, decrements the waiter count on exit, and interrupts the lookup fiber if no waiters remain. ([github.com](https://github.com/Effect-TS/effect/blob/main/packages/effect/src/ScopedCache.ts?utm_source=openai))

**Version caveat:** That source is `main`, not rc.115. The release notes establish the rc.115 fixes, but the search results don’t establish the precise rc.115 implementation or whether a specific “cleanup pending lookup” scenario is covered.

Citations:

- 1: https://packagetrack.dev/npm/effect?utm_source=openai
- 2: https://github.com/Effect-TS/effect/blob/main/packages/effect/src/ScopedCache.ts?utm_source=openai

🌐 Web query:

site:github.com/Effect-TS/effect "Cache" "4.0.1" "interrupted" lookup cleanup

💡 Result:

For Effect-TS’s **`ScopedCache`**, the source says an interrupted lookup is removed from the cache and its entry scope is closed; a later lookup can start fresh. Waiting callers also have interruption cleanup installed before awaiting the shared result. ([github.com](https://github.com/Effect-TS/effect/blob/main/packages/effect/src/ScopedCache.ts?utm_source=openai))

**Version caveat:** the source found is the repository’s current `main` branch, not a version-pinned `4.0.1` source, so it doesn’t establish that these exact details apply to `4.0.1`. The release page surfaced `effect@4.0.0`, but didn’t resolve a `4.0.1` release. ([github.com](https://github.com/Effect-TS/effect/blob/main/packages/effect/src/ScopedCache.ts?utm_source=openai))

Citations:

- 1: https://github.com/Effect-TS/effect/blob/main/packages/effect/src/ScopedCache.ts?utm_source=openai
- 2: https://github.com/Effect-TS/effect/blob/main/packages/effect/src/ScopedCache.ts?utm_source=openai

🌐 Web query:

Effect-TS/effect 6494 "only interrupt cache lookup when all awaiters are gone" pull request details

💡 Result:

PR **#6494** (“only interrupt cache lookup when all awaiters are gone”) was opened by **@tim-smart** and merged into `main` on **July 20, 2026**. It changed cache entries to track a shared lookup fiber and its awaiters: if one caller stops waiting, the lookup continues for other callers; it is interrupted only when the last awaiter leaves. The PR also added tests for multi-caller interruption and cancellation behavior. (GitHub pull request 6494 in Effect-TS/effect (link omitted to avoid creating a cross-reference))

The change targeted `Cache.ts` and was recorded as a patch change for `effect` and 26 related packages. (GitHub pull request 6494 in Effect-TS/effect (link omitted to avoid creating a cross-reference))

The PR page’s detailed implementation summary is an automated CodeRabbit walkthrough, not a maintainer-authored design explanation; the underlying diff and tests are the best sources for exact mechanics. (GitHub pull request 6494 in Effect-TS/effect (link omitted to avoid creating a cross-reference))

Citations:

- 1: GitHub pull request 6494 in Effect-TS/effect (link omitted to avoid creating a cross-reference)
- 2: GitHub pull request 6494 in Effect-TS/effect (link omitted to avoid creating a cross-reference)
- 3: GitHub pull request 6494 in Effect-TS/effect (link omitted to avoid creating a cross-reference)

🌐 Web query:

Effect-TS/effect 7614 "Prevent Cache from retaining synchronously interrupted lookups" pull request details

💡 Result:

### PR #7614 summary

- **Title:** “fix(Cache): avoid caching synchronous interruptions”
- **Merged:** September 2, 2026, into `Effect-TS/effect:main` by `tim-smart`; merge commit `78cc9c0`. (GitHub pull request 7614 in Effect-TS/effect (link omitted to avoid creating a cross-reference))
- **Bug:** A `Cache.get` lookup could be interrupted synchronously and finish before its cache entry was published. Cleanup then had no entry to remove, so subsequent reads replayed the cached interruption rather than rerunning the lookup. (GitHub pull request 7614 in Effect-TS/effect (link omitted to avoid creating a cross-reference))
- **Fix:** After registering observers, check whether the lookup fiber has already completed with interruption; if so, skip publishing the entry. The PR says this preserves observer ordering and lets later reads retry. (GitHub pull request 7614 in Effect-TS/effect (link omitted to avoid creating a cross-reference))
- **Verification:** The author reports the focused `Cache.test.ts` suite passed all 94 tests, and that the regression test fails on the old implementation because the second read gets the cached interruption instead of `42`. (GitHub pull request 7614 in Effect-TS/effect (link omitted to avoid creating a cross-reference))

The PR links the fix to issue **#7608** and EFF-1018. (GitHub pull request 7614 in Effect-TS/effect (link omitted to avoid creating a cross-reference))

Citations:

- 1: GitHub pull request 7614 in Effect-TS/effect (link omitted to avoid creating a cross-reference)
- 2: GitHub pull request 7614 in Effect-TS/effect (link omitted to avoid creating a cross-reference)
- 3: GitHub pull request 7614 in Effect-TS/effect (link omitted to avoid creating a cross-reference)
- 4: GitHub pull request 7614 in Effect-TS/effect (link omitted to avoid creating a cross-reference)
- 5: GitHub pull request 7614 in Effect-TS/effect (link omitted to avoid creating a cross-reference)

🌐 Web query:

Effect-TS/effect Cache.ts tag effect@4.0.0-rc.115 versus 4.0.1 interrupted cleanup lookup

💡 Result:

I can’t establish the **`Cache.ts` difference between `effect@4.0.0-rc.115` and `effect@4.0.1`** from the sources I could access: the versioned GitHub file pages weren’t available, and the current `main` source is not evidence of either tag’s contents. ([]())

The accessible `Cache.ts` documentation describes ordinary `Cache` as sharing an in-progress lookup among callers, but doesn’t establish what cleanup does when that lookup is interrupted. ([effect-ts.github.io](https://effect-ts.github.io/effect/effect/Cache.ts.html?utm_source=openai)) The current `ScopedCache.ts` source does show scope cleanup for interrupted lookup/refresh paths, but that is a different module and cannot confirm behavior in `Cache.ts` for either requested version. ([github.com](https://github.com/Effect-TS/effect/blob/main/packages/effect/src/ScopedCache.ts?utm_source=openai))

**Unresolved:** whether rc.115 and 4.0.1 differ in interrupted-lookup cleanup, and which one removes or completes the cached entry. The closest available reference is the current `Cache.ts` source. ([github.com](https://github.com/Effect-TS/effect-smol/blob/main/packages/effect/src/Cache.ts?utm_source=openai))

Citations:

- 1: https://effect-ts.github.io/effect/effect/Cache.ts.html?utm_source=openai
- 2: https://github.com/Effect-TS/effect/blob/main/packages/effect/src/ScopedCache.ts?utm_source=openai
- 3: https://github.com/Effect-TS/effect-smol/blob/main/packages/effect/src/Cache.ts?utm_source=openai

🏁 Script executed:

#!/bin/bash
set -eu
python3 <<'PY'
import urllib.error
import urllib.request

base = "https://raw.githubusercontent.com/Effect-TS/effect/{ref}/packages/effect/src/Cache.ts"
refs = ["effect@4.0.0-rc.115", "effect@4.0.1"]
needles = ("awaiters", "lookupFiber", "interrupt", "onExit", "pending", "lookup:")
for ref in refs:
    url = base.format(ref=ref.replace("@", "%40"))
    print(f"--- {ref} Cache.ts ---")
    try:
        with urllib.request.urlopen(url, timeout=20) as response:
            lines = response.read().decode().splitlines()
    except (urllib.error.URLError, TimeoutError) as error:
        print(f"FETCH_FAILED: {type(error).__name__}: {error}")
        continue
    matches = [i for i, line in enumerate(lines) if any(n in line for n in needles)]
    if not matches:
        print(f"Fetched {len(lines)} lines; no selected markers")
        continue
    spans = []
    for i in matches:
        start, end = max(0, i - 5), min(len(lines), i + 9)
        if spans and start <= spans[-1][1]:
            spans[-1] = (spans[-1][0], max(spans[-1][1], end))
        else:
            spans.append((start, end))
    print(f"Fetched {len(lines)} lines; relevant excerpts:")
    for start, end in spans:
        for i in range(start, end):
            print(f"{i + 1:5} {lines[i]}")
        print()
PY

Repository: pingdotgg/t3code

Length of output: 41596


🏁 Script executed:

#!/bin/bash
set -eu
python3 <<'PY'
import re
import urllib.request

base = "https://raw.githubusercontent.com/Effect-TS/effect/{ref}/packages/effect/src/{path}"
def fetch(ref, path):
    url = base.format(ref=ref.replace("@", "%40"), path=path)
    with urllib.request.urlopen(url, timeout=20) as response:
        return response.read().decode().splitlines()

for ref in ("effect@4.0.0-rc.115", "effect@4.0.1"):
    print(f"--- {ref} Cache.ts lookup and EntryImpl ---")
    lines = fetch(ref, "Cache.ts")
    for start, end in ((405, 495),):
        for i in range(start - 1, min(end, len(lines))):
            print(f"{i + 1:5} {lines[i]}")
    print()

print("--- rc.115 Effect.ts catchCause declaration ---")
lines = fetch("effect@4.0.0-rc.115", "Effect.ts")
hits = [i for i, line in enumerate(lines) if re.search(r"export const catchCause\\b|export function catchCause\\b|catchCause\\s*=", line)]
print("matching declarations:", [i + 1 for i in hits])
for i in hits[:3]:
    for j in range(max(0, i - 18), min(len(lines), i + 34)):
        print(f"{j + 1:5} {lines[j]}")
    print()
PY

Repository: pingdotgg/t3code

Length of output: 7491


🏁 Script executed:

#!/bin/bash
set -eu
python3 <<'PY'
import urllib.request

url = "https://raw.githubusercontent.com/Effect-TS/effect/effect%404.0.0-rc.115/packages/effect/src/Effect.ts"
with urllib.request.urlopen(url, timeout=20) as response:
    lines = response.read().decode().splitlines()
print("--- Effect.ts header ---")
for i, line in enumerate(lines[:100], 1):
    print(f"{i:5} {line}")
hits = [i for i, line in enumerate(lines) if "catchCause" in line]
print("--- Effect.ts catchCause occurrences ---")
print("line numbers:", [i + 1 for i in hits])
for i in hits:
    for j in range(max(0, i - 5), min(len(lines), i + 10)):
        print(f"{j + 1:5} {lines[j]}")
    print()
PY

Repository: pingdotgg/t3code

Length of output: 13382


🏁 Script executed:

#!/bin/bash
set -eu
python3 <<'PY'
import urllib.request

base = "https://raw.githubusercontent.com/Effect-TS/effect/effect%404.0.0-rc.115/packages/effect/src/{path}"
for path in ("internal/effect.ts", "Effect.ts"):
    with urllib.request.urlopen(base.format(path=path), timeout=20) as response:
        lines = response.read().decode().splitlines()
    print(f"--- {path} catchCause context ---")
    hits = [i for i, line in enumerate(lines) if "catchCause" in line]
    print("matches:", [i + 1 for i in hits])
    for i in hits:
        if path.endswith("Effect.ts") and not (3180 <= i + 1 <= 3270):
            continue
        for j in range(max(0, i - 8), min(len(lines), i + 24)):
            print(f"{j + 1:5} {lines[j]}")
        print()
PY

Repository: pingdotgg/t3code

Length of output: 22308


🏁 Script executed:

#!/bin/bash
set -eu
python3 <<'PY'
import urllib.request

base = "https://raw.githubusercontent.com/Effect-TS/effect/effect%404.0.0-rc.115/packages/effect/src/{path}"
for path in ("internal/core.ts", "internal/fiberRuntime.ts"):
    try:
        with urllib.request.urlopen(base.format(path=path), timeout=20) as response:
            lines = response.read().decode().splitlines()
    except Exception as error:
        print(f"--- {path}: FETCH_FAILED {type(error).__name__}: {error}")
        continue
    print(f"--- {path}: OnFailure and interruption evaluation ---")
    hits = [i for i, line in enumerate(lines) if "OnFailure" in line]
    print("OnFailure lines:", [i + 1 for i in hits])
    spans = []
    for i in hits:
        start, end = max(0, i - 8), min(len(lines), i + 20)
        if spans and start <= spans[-1][1]:
            spans[-1] = (spans[-1][0], max(spans[-1][1], end))
        else:
            spans.append((start, end))
    for start, end in spans:
        for i in range(start, end):
            print(f"{i + 1:5} {lines[i]}")
        print()
PY

Repository: pingdotgg/t3code

Length of output: 318


🏁 Script executed:

#!/bin/bash
set -eu
python3 <<'PY'
import urllib.request

url = "https://raw.githubusercontent.com/Effect-TS/effect/effect%404.0.0-rc.115/packages/effect/src/internal/effect.ts"
with urllib.request.urlopen(url, timeout=20) as response:
    lines = response.read().decode().splitlines()
hits = [i for i, line in enumerate(lines) if "evaluateCont" in line]
print("evaluateCont lines:", [i + 1 for i in hits])
for i in hits:
    for j in range(max(0, i - 10), min(len(lines), i + 48)):
        print(f"{j + 1:5} {lines[j]}")
    print()
PY

Repository: pingdotgg/t3code

Length of output: 9265


Upgrade Effect to preserve interrupted-load retries.

The lockfile resolves the patched effect@4.0.0-rc.115. In this version, the last waiter interrupts the lookup while the cache entry remains published. A reader in that window can join the interrupted entry and fail instead of starting a new lookup. Upgrade the resolved Effect version to 4.0.1 or newer, or add an equivalent cleanup workaround and regression test.

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Review comment at @apps/server/src/provider/ModelManifest.ts at line 364:
Update the Effect dependency resolution to version 4.0.1 or newer so interrupted
manifest-load cache entries are handled safely and waiting readers can retry the
lookup; alternatively, add cleanup around the cache entry in the ModelManifest
loading flow and a regression test that verifies a reader after the last waiter
interrupts starts a fresh lookup.

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Agreed this window exists. It is documented in the PR body. The fix is Effect-TS/effect#8719 in effect@4.0.1, and moving to that version belongs in the dependency bump, not here. The window only lasts while a cancelled lookup is still cleaning up, and the next call after it retries.

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@juliusmarminge Thanks for the clarification. The window is temporary: a call after lookup cleanup retries. I agree that the fix belongs in the dependency bump, not a local workaround in this PR.

Would you like a follow-up issue for the Effect upgrade?


✏️ Learnings added
Learnt from: juliusmarminge
Repo: pingdotgg/t3code PR: 15500
File: apps/server/src/provider/ModelManifest.ts:364-364
Timestamp: 2026-10-05T09:14:01.956Z
Learning: In Effect Cache on effect4.0.0-rc.115, a caller can join a cancelled lookup while it is still cleaning up and receive interruption. This does not permanently retain the interruption: a call after cleanup retries. Effect-TS/effect#8719 fixes this cleanup window in effect4.0.1. Distinguish this temporary race from permanent caching of an interrupted result.

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🧠 Learnings used
Learnt from: juliusmarminge
Repo: pingdotgg/t3code PR: 15500
File: apps/server/src/provider/ModelManifest.ts:362-365
Timestamp: 2026-10-05T09:10:31.413Z
Learning: In Effect v4, interruption of the executing fiber skips catch handlers. In apps/server/src/provider/ModelManifest.ts, the disk-cache lookup only runs readFileString and decoding, so Effect.catchCause does not convert interruption of the lookup fiber into a successful null result. Distinguish this from apps/server/src/project/ManagedProjectFolders.ts: the Scratch probe joins a shared lookup and can inherit another fiber's interruption, which requires explicit interruption mapping.

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Outdated
if (fromDisk === null) return;
// The disk copy is the last-seen remote manifest, so it outranks the
// bundle even when stale, unless the bundle's own edit date is newer
// than the cached manifest's. Then the release carries data the cache
// has not seen and the cache is dropped so the next refresh replaces
// it. Comparing edit dates, not fetch time, keeps this independent of
// when the cache was written relative to the release.
if (manifestUpdatedAtMs(BUNDLED_MODEL_MANIFEST) > manifestUpdatedAtMs(fromDisk.manifest)) {
return;
}
manifest = fromDisk.manifest;
fetchedAtMs = fromDisk.fetchedAtMs;
}),
});
const ensureDiskCacheLoaded = Cache.get(diskCacheLoad, undefined);

const refresh = Effect.fn("ModelManifest.refresh")(function* (force = false) {
yield* ensureDiskCacheLoaded;
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30 changes: 30 additions & 0 deletions apps/server/src/provider/providerMaintenance.test.ts
Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,9 @@ import * as NodePath from "node:path";
import { ProviderDriverKind, ProviderInstanceId, type ServerProvider } from "@t3tools/contracts";
import { HostProcessPlatform } from "@t3tools/shared/hostProcess";
import * as Crypto from "effect/Crypto";
import * as Deferred from "effect/Deferred";
import * as Effect from "effect/Effect";
import * as Fiber from "effect/Fiber";
import * as Sink from "effect/Sink";
import * as Stream from "effect/Stream";
import { HttpClient } from "effect/unstable/http";
Expand Down Expand Up @@ -786,6 +788,34 @@ it.layer(NodeServices.layer)("providerMaintenance", (it) => {
expect(resolutions).toBe(2);
}),
);

it.effect("resolves again after the first read is interrupted", () =>
Effect.gen(function* () {
const release = yield* Deferred.make<void>();
let resolutions = 0;
const resolve = yield* makeCachedProviderMaintenanceResolution(
Effect.suspend(() => {
resolutions += 1;
return resolutions === 1
? Effect.never
: Deferred.await(release).pipe(Effect.as(manualPackageTool));
}),
);

const first = yield* Effect.forkChild(resolve(), { startImmediately: true });
yield* Fiber.interrupt(first);

// The next read resolves again, and a reader that joined it keeps it
// running when the reader that started it goes away.
const owner = yield* Effect.forkChild(resolve(), { startImmediately: true });
const waiter = yield* Effect.forkChild(resolve(), { startImmediately: true });
yield* Fiber.interrupt(owner);
yield* Deferred.succeed(release, undefined);
expect(yield* Fiber.join(waiter)).toEqual(manualPackageTool);
expect(yield* resolve()).toEqual(manualPackageTool);
expect(resolutions).toBe(2);
}),
);
});

it("pins only owned package-manager installs and preserves their execution context", () => {
Expand Down
16 changes: 10 additions & 6 deletions apps/server/src/provider/providerMaintenance.ts
Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@ import { compareSemverVersions } from "@t3tools/shared/semver";
import { HostProcessPlatform } from "@t3tools/shared/hostProcess";
import { causeErrorTag } from "@t3tools/shared/observability";
import { resolveCommandPath } from "@t3tools/shared/shell";
import * as Cache from "effect/Cache";
import * as Config from "effect/Config";
import * as Context from "effect/Context";
import * as DateTime from "effect/DateTime";
Expand Down Expand Up @@ -601,17 +602,20 @@ export const resolveProviderMaintenanceCapabilitiesEffect = Effect.fn(
/**
* Turn a one-shot resolution into the shape drivers expose: a cached read for
* advisories and a `fresh` read that update execution uses so it never trusts
* ownership derived before the user clicked.
* ownership derived before the user clicked. An interrupted resolution is not
* cached, so the next read resolves again.
*/
export const makeCachedProviderMaintenanceResolution = Effect.fn(
"makeCachedProviderMaintenanceResolution",
)(function* (resolve: Effect.Effect<ProviderMaintenanceCapabilities>) {
const [cached, invalidate] = yield* Effect.cachedInvalidateWithTTL(
resolve,
MAINTENANCE_CAPABILITIES_CACHE_TTL,
);
const cache = yield* Cache.make({
capacity: 1,
timeToLive: MAINTENANCE_CAPABILITIES_CACHE_TTL,
lookup: () => resolve,
});
const cached = Cache.get(cache, undefined);
return (options?: { readonly fresh?: boolean }) =>
options?.fresh ? invalidate.pipe(Effect.andThen(cached)) : cached;
options?.fresh ? Cache.invalidate(cache, undefined).pipe(Effect.andThen(cached)) : cached;
});

function deriveVersionAdvisory(input: {
Expand Down
35 changes: 20 additions & 15 deletions apps/server/src/terminal/NodePtyAdapter.ts
Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import * as NodeModule from "node:module";
import * as NodeNet from "node:net";

import * as Cache from "effect/Cache";
import * as Context from "effect/Context";
import * as Effect from "effect/Effect";
import * as FileSystem from "effect/FileSystem";
Expand Down Expand Up @@ -73,14 +74,13 @@ const ensureNodePtySpawnHelperExecutable = Effect.fn(function* () {

const helperPath = yield* resolveNodePtySpawnHelperPath;
if (!helperPath) return;
didEnsureSpawnHelperExecutable = true;

if (!(yield* fs.exists(helperPath))) {
return;
if (yield* fs.exists(helperPath)) {
// Best-effort: avoid FileSystem.stat in packaged mode where some fs metadata can be missing.
yield* fs.chmod(helperPath, 0o755).pipe(Effect.orElseSucceed(() => undefined));
}

// Best-effort: avoid FileSystem.stat in packaged mode where some fs metadata can be missing.
yield* fs.chmod(helperPath, 0o755).pipe(Effect.orElseSucceed(() => undefined));
// Set only once the check has finished, so an interrupted check runs again.
didEnsureSpawnHelperExecutable = true;
});

/**
Expand Down Expand Up @@ -249,15 +249,20 @@ export const make = Effect.fn("NodePtyAdapter.make")(function* () {
}),
}).pipe(Effect.orDie);

const ensureNodePtySpawnHelperExecutableCached = yield* Effect.cached(
ensureNodePtySpawnHelperExecutable().pipe(
Effect.provideService(FileSystem.FileSystem, fs),
Effect.provideService(Path.Path, path),
Effect.provideService(HostProcessPlatform, platform),
Effect.provideService(HostProcessArchitecture, architecture),
Effect.orElseSucceed(() => undefined),
),
);
// Runs once per adapter. `Cache` drops an interrupted run, so a spawn that is
// cancelled mid-check does not fail every later spawn.
const spawnHelperCheck = yield* Cache.make({
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capacity: 1,
lookup: () =>
ensureNodePtySpawnHelperExecutable().pipe(
Effect.provideService(FileSystem.FileSystem, fs),
Effect.provideService(Path.Path, path),
Effect.provideService(HostProcessPlatform, platform),
Effect.provideService(HostProcessArchitecture, architecture),
Effect.orElseSucceed(() => undefined),
),
});
const ensureNodePtySpawnHelperExecutableCached = Cache.get(spawnHelperCheck, undefined);

return PtyAdapter.PtyAdapter.of({
spawn: Effect.fn("NodePtyAdapter.spawn")(function* (input) {
Expand Down
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