[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill:01M71H603Q22C20JC2YDA7FC23":3,"skill-same:01M71H603Q22C20JC2YDA7FC23":53},{"skillNo":4,"name":5,"nameZh":6,"description":7,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":6,"repositoryNo":12,"starsCount":13,"licenseSpdxId":14,"licenseFileUrl":6,"sourceHtmlUrl":15,"categories":16,"keywords":17,"publishedAt":28,"linkOnly":29,"markdownContent":30,"markdownBody":31,"frontMatter":32,"refName":33,"commitSha":34,"skillDirectory":35,"forksCount":13,"repositoryHtmlUrl":36,"repositoryHomepageUrl":6,"ownerHtmlUrl":37,"ownerBlogUrl":6,"ownerDescription":6,"updatedAt":38,"install":39,"resources":52},"01M71H603Q22C20JC2YDA7FC23","03-error-model",null,"Effect-TS 4 error model — Schema.TaggedErrorClass, typed defects, union errors, and error channel semantics","lambda-solver\u002Flambdabench-pro","lambda-solver","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F279071046?v=4","01M71H55W2WK3PM6RRAY9JZWAJ","01M71H55WRT9XAFDAVACTCC2XP",0,"MIT","https:\u002F\u002Fgithub.com\u002Flambda-solver\u002Flambdabench-pro\u002Fblob\u002Fmain\u002F.opencode\u002Fskills\u002Feffect-ts\u002Fcore\u002F03-error-model\u002FSKILL.md",[],[18,19,20,21,22,23,24,25,26,27],"error","model","03 error model","effect","opencode","defects","union","errors","schema","channel","2026-11-10 10:12:30",false,"---\nname: 03-error-model\ndescription: Effect-TS 4 error model — Schema.TaggedErrorClass, typed defects, union errors, and error channel semantics\nlicense: MIT\ncompatibility: opencode\n---\n\n# Error Model\n\n## Defining errors\n\n### Schema.TaggedErrorClass — primary pattern\n\n```typescript\nimport { Schema } from \"effect\";\n\n\u002F\u002F With fields\nexport class ParseError extends Schema.TaggedErrorClass\u003CParseError>()(\"ParseError\", {\n  input: Schema.String,\n  message: Schema.String,\n}) {}\n\n\u002F\u002F With unknown cause (from catch blocks)\nexport class FetchError extends Schema.TaggedErrorClass\u003CFetchError>()(\"FetchError\", {\n  url: Schema.String,\n  cause: Schema.Defect, \u002F\u002F Schema.Defect = unknown\n}) {}\n\n\u002F\u002F No fields\nexport class NotFoundError extends Schema.TaggedErrorClass\u003CNotFoundError>()(\"NotFoundError\", {}) {}\n```\n\n### Plain class — for simple non-serializable errors\n\nUse when serialization \u002F Schema isn't needed (e.g. internal service boundary).\n\n```typescript\nexport class LlmError {\n  readonly _tag = \"LlmError\";\n  constructor(readonly message: string) {}\n}\n```\n\n### Reason errors — nested tagged union\n\n```typescript\nexport class RateLimitError extends Schema.TaggedErrorClass\u003CRateLimitError>()(\"RateLimitError\", {\n  retryAfter: Schema.Number,\n}) {}\n\nexport class AiError extends Schema.TaggedErrorClass\u003CAiError>()(\"AiError\", {\n  reason: Schema.Union([RateLimitError, QuotaExceededError]),\n}) {}\n```\n\n## Catching errors\n\n```typescript\n\u002F\u002F Single tag\nprogram.pipe(Effect.catchTag(\"ParseError\", (e) => Effect.succeed(`fallback: ${e.message}`)));\n\n\u002F\u002F Multiple tags — same handler\nprogram.pipe(Effect.catchTag([\"ParseError\", \"NetworkError\"], (_) => Effect.succeed(0)));\n\n\u002F\u002F Multiple tags — individual handlers\nprogram.pipe(\n  Effect.catchTags({\n    ParseError: (e) => Effect.succeed(`parse: ${e.message}`),\n    NetworkError: (e) => Effect.succeed(`net: ${e.statusCode}`),\n  }),\n);\n\n\u002F\u002F All typed errors — Effect.catch (NOT catchAll — that doesn't exist)\nprogram.pipe(Effect.catch((_e) => Effect.succeed(defaultValue)));\n```\n\n## Catching reason errors\n\n```typescript\n\u002F\u002F One specific reason\nprogram.pipe(\n  Effect.catchReason(\"AiError\", \"RateLimitError\",\n    (r) => Effect.succeed(`retry after ${r.retryAfter}s`),\n  ),\n)\n\n\u002F\u002F Unwrap into error channel for catchTags\nprogram.pipe(\n  Effect.unwrapReason(\"AiError\"),\n  Effect.catchTags({\n    RateLimitError:    (r) => ...,\n    QuotaExceededError:(r) => ...,\n  }),\n)\n```\n\n## Catching defects (unexpected errors)\n\n```typescript\nimport { Cause } from \"effect\";\n\nprogram.pipe(\n  Effect.catchCause(\n    (cause) => (Cause.isFailure(cause) ? Effect.succeed(\"recovered from typed error\") : Effect.failCause(cause)), \u002F\u002F re-raise defects\n  ),\n);\n```\n\n## Wrapping at service boundaries\n\n```typescript\nconst findById = Effect.fn(\"Repo.findById\")(function* (id: string) {\n  return yield* sql`SELECT * FROM users WHERE id = ${id}`.pipe(\n    Effect.mapError((reason) => new UserRepoError({ reason })),\n  );\n});\n```\n\n## Return before yield\\* error\n\n```typescript\n\u002F\u002F ✅ return ensures TS knows execution stops\nexport const load = Effect.fn(\"load\")(function* (id: string) {\n  if (!id) return yield* new NotFoundError();\n  return yield* fetchById(id);\n});\n```\n","# Error Model\n\n## Defining errors\n\n### Schema.TaggedErrorClass — primary pattern\n\n```typescript\nimport { Schema } from \"effect\";\n\n\u002F\u002F With fields\nexport class ParseError extends Schema.TaggedErrorClass\u003CParseError>()(\"ParseError\", {\n  input: Schema.String,\n  message: Schema.String,\n}) {}\n\n\u002F\u002F With unknown cause (from catch blocks)\nexport class FetchError extends Schema.TaggedErrorClass\u003CFetchError>()(\"FetchError\", {\n  url: Schema.String,\n  cause: Schema.Defect, \u002F\u002F Schema.Defect = unknown\n}) {}\n\n\u002F\u002F No fields\nexport class NotFoundError extends Schema.TaggedErrorClass\u003CNotFoundError>()(\"NotFoundError\", {}) {}\n```\n\n### Plain class — for simple non-serializable errors\n\nUse when serialization \u002F Schema isn't needed (e.g. internal service boundary).\n\n```typescript\nexport class LlmError {\n  readonly _tag = \"LlmError\";\n  constructor(readonly message: string) {}\n}\n```\n\n### Reason errors — nested tagged union\n\n```typescript\nexport class RateLimitError extends Schema.TaggedErrorClass\u003CRateLimitError>()(\"RateLimitError\", {\n  retryAfter: Schema.Number,\n}) {}\n\nexport class AiError extends Schema.TaggedErrorClass\u003CAiError>()(\"AiError\", {\n  reason: Schema.Union([RateLimitError, QuotaExceededError]),\n}) {}\n```\n\n## Catching errors\n\n```typescript\n\u002F\u002F Single tag\nprogram.pipe(Effect.catchTag(\"ParseError\", (e) => Effect.succeed(`fallback: ${e.message}`)));\n\n\u002F\u002F Multiple tags — same handler\nprogram.pipe(Effect.catchTag([\"ParseError\", \"NetworkError\"], (_) => Effect.succeed(0)));\n\n\u002F\u002F Multiple tags — individual handlers\nprogram.pipe(\n  Effect.catchTags({\n    ParseError: (e) => Effect.succeed(`parse: ${e.message}`),\n    NetworkError: (e) => Effect.succeed(`net: ${e.statusCode}`),\n  }),\n);\n\n\u002F\u002F All typed errors — Effect.catch (NOT catchAll — that doesn't exist)\nprogram.pipe(Effect.catch((_e) => Effect.succeed(defaultValue)));\n```\n\n## Catching reason errors\n\n```typescript\n\u002F\u002F One specific reason\nprogram.pipe(\n  Effect.catchReason(\"AiError\", \"RateLimitError\",\n    (r) => Effect.succeed(`retry after ${r.retryAfter}s`),\n  ),\n)\n\n\u002F\u002F Unwrap into error channel for catchTags\nprogram.pipe(\n  Effect.unwrapReason(\"AiError\"),\n  Effect.catchTags({\n    RateLimitError:    (r) => ...,\n    QuotaExceededError:(r) => ...,\n  }),\n)\n```\n\n## Catching defects (unexpected errors)\n\n```typescript\nimport { Cause } from \"effect\";\n\nprogram.pipe(\n  Effect.catchCause(\n    (cause) => (Cause.isFailure(cause) ? Effect.succeed(\"recovered from typed error\") : Effect.failCause(cause)), \u002F\u002F re-raise defects\n  ),\n);\n```\n\n## Wrapping at service boundaries\n\n```typescript\nconst findById = Effect.fn(\"Repo.findById\")(function* (id: string) {\n  return yield* sql`SELECT * FROM users WHERE id = ${id}`.pipe(\n    Effect.mapError((reason) => new UserRepoError({ reason })),\n  );\n});\n```\n\n## Return before yield\\* error\n\n```typescript\n\u002F\u002F ✅ return ensures TS knows execution stops\nexport const load = Effect.fn(\"load\")(function* (id: string) {\n  if (!id) return yield* new NotFoundError();\n  return yield* fetchById(id);\n});\n```\n",{"name":5,"license":14,"description":7,"compatibility":22},"main","816c073aaf171300af3605b06f7ec5aa7370ef0b",".opencode\u002Fskills\u002Feffect-ts\u002Fcore\u002F03-error-model","https:\u002F\u002Fgithub.com\u002Flambda-solver\u002Flambdabench-pro","https:\u002F\u002Fgithub.com\u002Flambda-solver","2026-05-31 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