Session 15BbzBSAziBz

<skill_content name="effect">
# Skill: effect

# Effect

This codebase uses Effect for typed, composable TypeScript services, schemas, and workflows.

## Source Of Truth

Use the current Effect v4 / effect-smol source, not memory or older Effect v2/v3 examples.

1. If `.opencode/references/effect-smol` is missing, clone `https://github.com/Effect-TS/effect-smol` there. Do this in the project, not in the skill folder.
2. Search `.opencode/references/effect-smol` for exact APIs, examples, tests, and naming patterns before answering or implementing Effect-specific code.
3. Also inspect existing repo code for local house style before introducing new patterns.
4. Prefer answers and implementations backed by specific source files or nearby repo examples.

## Guidelines

- Prefer current Effect v4 APIs and project-local patterns over old blog posts, examples, or package-memory guesses.
- Use `Effect.gen(function* () { ... })` for multi-step workflows.
- Use `Effect.fn("Name")` or ...

<path>/home/byk/Code/opencode</path>
<type>directory</type>
<entries>
.dockerignore
.editorconfig
.git/
.gitattributes
.github/
.gitignore
.gitleaksignore
.husky/
.lore.md
.node-cache/
.opencode/
.oxlintrc.json
.prettierignore
.turbo/
.vscode/
.zed/
AGENTS.md
artifacts/
bun.lock
bunfig.toml
CONTEXT.md
CONTRIBUTING.md
flake.lock
flake.nix
github/
infra/
install
LICENSE
nix/
node_modules/
package.json
packages/
patches/
perf.data
perf.data.old
perf/
pnpm-lock.yaml
pnpm-workspace.yaml
README.ar.md
README.bn.md
README.br.md
README.bs.md
README.da.md
README.de.md
README.es.md
README.fr.md
README.gr.md
README.it.md
README.ja.md
README.ko.md
README.md
README.no.md
README.pl.md
README.ru.md
README.th.md
README.tr.md
README.uk.md
README.vi.md
README.zh.md
README.zht.md
screenshot-uk.png
script/
sdks/
SECURITY.md
specs/
sst-env.d.ts
sst.config.ts
STATS.md
tmp/
tsconfig.json
turbo.json

(71 entries)
</entries>

...output truncated...

Full output saved to: /home/byk/.local/share/opencode/tool-output/tool_0aa9cdde3001j3W2ay2c26zqoi

+      expect(yield* db.select().from(SessionInputTable).where(eq(SessionInputTable.id, messageID)).get()).toMatchObject(
+        {
+          wake_pending: true,
+        },
+      )
+      yield* recover()
+      expect(wakeCalls).toEqual([sessionID])
+    }),
+  )
+
   it.effect("rejects reuse of one ID with a different prompt", () =>
     Effect.gen(function* () {
       yield* setup
@@ -314,6 +511,48 @@ describe("SessionV2.prompt", () => {
     }),
   )
 
+  it.effect("never arms durable wake for a conflicting execution retry", () =>
+    Effect.gen(function* () {
+      yield* setup
+      const session = yield* SessionV2.Service
+      yield* session.prompt({
+        sessionID,
+        id: messageID,
+        prompt: Prompt.make({ text: "Original prompt" }),
+        resume: false,
+      })
+      wakeCalls.length = 0
+
+      const failure = yield* ...

 M .lore.md
 M AGENTS.md
 M packages/core/schema.json
 M packages/core/src/database/migration.gen.ts
 M packages/core/src/database/migration/20260914170650_session-recovery.ts
 D packages/core/src/database/migration/20260914214636_session-execution.ts
 D packages/core/src/database/migration/20260914222526_session-execution-phase.ts
 M packages/core/src/database/schema.gen.ts
 M packages/core/src/session.ts
 M packages/core/src/session/compaction.ts
 M packages/core/src/session/context-epoch.ts
 M packages/core/src/session/execution/local.ts
 M packages/core/src/session/input.ts
 M packages/core/src/session/message-updater.ts
 M packages/core/src/session/projector.ts
 M packages/core/src/session/recovery.ts
 M packages/core/src/session/run-coordinator.ts
 M packages/core/src/session/runner/index.ts
 M packages/core/src/session/runner/llm.ts
 M packages/core/src/session/runner/publish-llm-event.ts
 M packages/core/src/session/sql.ts
 M packages/core/test/database-migration.test.ts
 M ...

<path>/home/byk/Code/opencode/CONTRIBUTING.md</path>
<type>file</type>
<content>
1: # Contributing to OpenCode
2: 
3: We want to make it easy for you to contribute to OpenCode. Here are the most common type of changes that get merged:
4: 
5: - Bug fixes
6: - Additional LSPs / Formatters
7: - Improvements to LLM performance
8: - Support for new providers
9: - Fixes for environment-specific quirks
10: - Missing standard behavior
11: - Documentation improvements
12: 
13: However, any UI or core product feature must go through a design review with the core team before implementation.
14: 
15: If you are unsure if a PR would be accepted, feel free to ask a maintainer or look for issues with any of the following labels:
16: 
17: - [`help wanted`](https://github.com/anomalyco/opencode/issues?q=is%3Aissue%20state%3Aopen%20label%3Ahelp-wanted)
18: - [`good first issue`](https://github.com/anomalyco/opencode/issues?q=is%3Aissue%20state%3Aopen%20label%3A%22good%20first%20issue%22)
19: - ...

<path>/home/byk/Code/opencode/packages/core/package.json</path>
<type>file</type>
<content>
1: {
2:   "$schema": "https://json.schemastore.org/package.json",
3:   "version": "1.18.30",
4:   "name": "@opencode-ai/core",
5:   "type": "module",
6:   "license": "MIT",
7:   "private": true,
8:   "scripts": {
9:     "db": "bun drizzle-kit",
10:     "migration": "bun run script/migration.ts",
11:     "fix-node-pty": "bun run script/fix-node-pty.ts",
12:     "test": "bun test --only-failures",
13:     "typecheck": "tsgo --noEmit"
14:   },
15:   "bin": {
16:     "opencode": "./bin/opencode"
17:   },
18:   "exports": {
19:     "./effect/layer-node": "./src/effect/layer-node.ts",
20:     "./effect/app-node": "./src/effect/app-node.ts",
21:     "./session/runner": "./src/session/runner/index.ts",
22:     "./system-context": "./src/system-context/index.ts",
23:     "./*": "./src/*.ts"
24:   },
25:   "imports": {
26:     "#sqlite": {
27:       "bun": "./src/database/sqlite.bun.ts",
28:       ...

<path>/home/byk/Code/opencode/packages/core/src/session/runner/llm.ts</path>
<type>file</type>
<content>
1: import {
2:   LLM,
3:   LLMClient,
4:   LLMError,
5:   LLMEvent,
6:   Message,
7:   SystemPart,
8:   isContextOverflowFailure,
9:   type ProviderErrorEvent,
10: } from "@opencode-ai/llm"
11: import { Cause, DateTime, Effect, Exit, Fiber, Layer, Option, Semaphore, Stream } from "effect"
12: import { and, eq } from "drizzle-orm"
13: import { AgentV2 } from "../../agent"
14: import { Config } from "../../config"
15: import { Database } from "../../database/database"
16: import { EventV2 } from "../../event"
17: import { Location } from "../../location"
18: import { ModelV2 } from "../../model"
19: import { PermissionV2 } from "../../permission"
20: import { ProviderV2 } from "../../provider"
21: import { QuestionV2 } from "../../question"
22: import { SystemContext } from "../../system-context/index"
23: import { SystemContextRegistry } from "../../system-context/registry"
24: ...

<path>/home/byk/Code/opencode/packages/core/src/session/execution/local.ts</path>
<type>file</type>
<content>
1: import { and, asc, eq, isNull } from "drizzle-orm"
2: import { Cause, Clock, Duration, Effect, Exit, Layer, Schedule } from "effect"
3: import { Database } from "../../database/database"
4: import { LocationServiceMap } from "../../location-service-map"
5: import { makeGlobalNode } from "../../effect/app-node"
6: import { SessionRunCoordinator } from "../run-coordinator"
7: import { SessionRunner } from "../runner"
8: import { SessionMessage } from "../message"
9: import { SessionSchema } from "../schema"
10: import { SessionStore } from "../store"
11: import { SessionExecution } from "../execution"
12: import { SessionExecutionClaim } from "./claim"
13: import { SESSION_EXECUTION_LEASE_MS, SessionExecutionTable, SessionRecoveryTable } from "../sql"
14: 
15: /** Current-process routing for implicit-local Locations. Future remote placement belongs here. ...

<path>/home/byk/Code/opencode/packages/core/src/session/runner/publish-llm-event.ts</path>
<type>file</type>
<content>
1: import { ToolOutput, type LLMEvent, type ProviderMetadata, type ToolResultValue, type Usage } from "@opencode-ai/llm"
2: import { DateTime, Effect } from "effect"
3: import { EventV2 } from "../../event"
4: import { ModelV2 } from "../../model"
5: import { SessionEvent } from "../event"
6: import { SessionMessage } from "../message"
7: import { SessionSchema } from "../schema"
8: 
9: type Input = {
10:   readonly sessionID: SessionSchema.ID
11:   readonly agent: string
12:   readonly model: ModelV2.Ref
13:   readonly snapshot?: string
14:   readonly startCommit: (assistantMessageID: SessionMessage.ID) => Effect.Effect<void>
15:   readonly eventCommit: () => Effect.Effect<void>
16: }
17: 
18: const safe = (value: number | undefined) => Math.max(0, Number.isFinite(value) ? (value ?? ...

<path>/home/byk/Code/opencode/packages/core/src/session/recovery.ts</path>
<type>file</type>
<content>
1: export * as SessionRecovery from "./recovery"
2: 
3: import { and, asc, desc, eq, exists, gt, isNull, lte, or, sql } from "drizzle-orm"
4: import { Clock, DateTime, Effect, Layer, Option, Schedule, Schema } from "effect"
5: import { Database } from "../database/database"
6: import { makeGlobalNode } from "../effect/app-node"
7: import { EventV2 } from "../event"
8: import { SessionEvent } from "./event"
9: import { SessionExecution } from "./execution"
10: import { SessionProjector } from "./projector"
11: import { SessionExecutionClaim } from "./execution/claim"
12: import { SessionInput } from "./input"
13: import { SessionSchema } from "./schema"
14: import {
15:   MAX_WAKE_ATTEMPTS,
16:   SESSION_EXECUTION_LEASE_MS,
17:   SessionExecutionTable,
18:   SessionInputTable,
19:   SessionRecoveryTable,
20:   SessionMessageTable,
21:   SessionTable,
22: } from "./sql"
23: 
24: export ...