How do I install the Effect Index skill?

Run npx skillmds@latest add majiayu000/effect-index in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Effect Index safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: makes network calls. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Effect Index?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Effect Index free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Effect Index?

majiayu000 (@majiayu000) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Effect Index by majiayu000 — Agent Skill

Name: Effect Index
Rating: 4.5 (4 reviews)
Author: majiayu000

File contents

Effect Skill Index

Use this as a quick router to the right Skill for your task. Each entry links to a focused Skill optimized for a coding agent’s limited context.

Decision Tree

I need to write or refactor some Effect code → Foundations
I need robust error handling/retries → Errors & Retries
I must run things in parallel / manage fibers → Concurrency & Fibers
This is a data pipeline / batching / backpressure → Streams & Pipelines
I need DI/services/layers or test/live wiring → Layers & Services
Opening files/sockets/servers with cleanup → Resources & Scope
Add HTTP endpoints / JSON responses → HTTP & Routing
Validate inputs / parse config → Config & Schema
Value-based equality / high-perf immutable collections → Data Structures
Time, logging, spans/tracing → Time/Tracing/Logging
Queues, PubSub, background workers → Queues & Background
Write tests/mocks for services → Testing & Mocking
Looking for specific patterns or examples → Patterns Hub (130+ patterns)

Cross-Skill Patterns

All patterns are now available locally in the Patterns Hub (130+ patterns):

Retry transient failures → Errors & Retries + retry-based-on-specific-errors.mdx
Resource-safe streaming → Streams & Pipelines + stream-manage-resources.mdx
Graceful shutdown → Queues & Background + execute-long-running-apps-with-runfork.mdx
Service layer design → Layers & Services + model-dependencies-as-services.mdx
HTTP server setup → HTTP & Routing + build-a-basic-http-server.mdx
Schema validation → Config & Schema + define-contracts-with-schema.mdx
Testing with mocks → Testing & Mocking + mocking-dependencies-in-tests.mdx

Tip: For any "How do I...?" question, check the Patterns Hub decision tree first!

Local Source Reference

CRITICAL: Always search local Effect source before implementing

The full Effect source code is available at docs/effect-source/. Every Effect skill now includes a "Local Source Reference" section with:

Key source files for that skill's domain
Example grep commands to find implementations
Workflow for searching before coding

Quick Access to Source

All Effect packages: docs/effect-source/
Core library: docs/effect-source/effect/src/
Platform APIs: docs/effect-source/platform/src/
SQL: docs/effect-source/sql/src/
Schema: docs/effect-source/schema/src/

Example: Finding Effect.gen

grep -F "Effect.gen" docs/effect-source/effect/src/Effect.ts

Workflow Reminder

Read the relevant skill (from decision tree above)
Review the skill's "Local Source Reference" section
Search the Effect source code for the API you need
Study the implementation and types
Write your code based on real implementations

See CLAUDE.local.md for complete source reference guide

References

Agent Skills overview: Introducing Agent Skills
Skills guide: Claude Code Skills Documentation
Local Patterns Hub: ../effect-patterns-hub/SKILL.md (130+ patterns)
Pattern Documentation: ../../docs/effect-patterns/
AGENTS.md: ../../AGENTS.md (Effect best practices for AI agents)
EffectPatterns (upstream source): PaulJPhilp/EffectPatterns

---name: effect-indexdescription: Skill index and decision guide. Use to pick the right Effect Skill quickly and follow a minimal decision tree.--- # Effect Skill Index Use this as a quick router to the right Skill for your task. Each entry links to a focused Skill optimized for a coding agent’s limited context. ## Decision Tree - I need to write or refactor some Effect code → [Foundations](../effect-foundations/SKILL.md) - I need robust error handling/retries → [Errors & Retries](../effect-errors-retries/SKILL.md) - I must run things in parallel / manage fibers → [Concurrency & Fibers](../effect-concurrency-fibers/SKILL.md) - This is a data pipeline / batching / backpressure → [Streams & Pipelines](../effect-streams-pipelines/SKILL.md) - I need DI/services/layers or test/live wiring → [Layers & Services](../effect-layers-services/SKILL.md) - Opening files/sockets/servers with cleanup → [Resources & Scope](../effect-resources-scope/SKILL.md) - Add HTTP endpoints / JSON responses → [HTTP & Routing](../effect-http-routing/SKILL.md) - Validate inputs / parse config → [Config & Schema](../effect-config-schema/SKILL.md) - Value-based equality / high-perf immutable collections → [Data Structures](../effect-collections-datastructs/SKILL.md) - Time, logging, spans/tracing → [Time/Tracing/Logging](../effect-time-tracing-logging/SKILL.md) - Queues, PubSub, background workers → [Queues & Background](../effect-queues-background/SKILL.md) - Write tests/mocks for services → [Testing & Mocking](../effect-testing-mocking/SKILL.md) - **Looking for specific patterns or examples** → [**Patterns Hub (130+ patterns)**](../effect-patterns-hub/SKILL.md) ## Cross-Skill Patterns All patterns are now available locally in the [Patterns Hub](../effect-patterns-hub/SKILL.md) (130+ patterns): - **Retry transient failures** → [Errors & Retries](../effect-errors-retries/SKILL.md) + [retry-based-on-specific-errors.mdx](../effect-patterns-hub/patterns/retry-based-on-specific-errors.mdx) - **Resource-safe streaming** → [Streams & Pipelines](../effect-streams-pipelines/SKILL.md) + [stream-manage-resources.mdx](../effect-patterns-hub/patterns/stream-manage-resources.mdx) - **Graceful shutdown** → [Queues & Background](../effect-queues-background/SKILL.md) + [execute-long-running-apps-with-runfork.mdx](../effect-patterns-hub/patterns/execute-long-running-apps-with-runfork.mdx) - **Service layer design** → [Layers & Services](../effect-layers-services/SKILL.md) + [model-dependencies-as-services.mdx](../effect-patterns-hub/patterns/model-dependencies-as-services.mdx) - **HTTP server setup** → [HTTP & Routing](../effect-http-routing/SKILL.md) + [build-a-basic-http-server.mdx](../effect-patterns-hub/patterns/build-a-basic-http-server.mdx) - **Schema validation** → [Config & Schema](../effect-config-schema/SKILL.md) + [define-contracts-with-schema.mdx](../effect-patterns-hub/patterns/define-contracts-with-schema.mdx) - **Testing with mocks** → [Testing & Mocking](../effect-testing-mocking/SKILL.md) + [mocking-dependencies-in-tests.mdx](../effect-patterns-hub/patterns/mocking-dependencies-in-tests.mdx) **Tip**: For any "How do I...?" question, check the [Patterns Hub](../effect-patterns-hub/SKILL.md) decision tree first! ## Local Source Reference **CRITICAL: Always search local Effect source before implementing** The full Effect source code is available at `docs/effect-source/`. Every Effect skill now includes a "Local Source Reference" section with: - Key source files for that skill's domain - Example grep commands to find implementations - Workflow for searching before coding ### Quick Access to Source - All Effect packages: `docs/effect-source/` - Core library: `docs/effect-source/effect/src/` - Platform APIs: `docs/effect-source/platform/src/` - SQL: `docs/effect-source/sql/src/` - Schema: `docs/effect-source/schema/src/` ### Example: Finding Effect.gen ```bash grep -F "Effect.gen" docs/effect-source/effect/src/Effect.ts ``` ### Workflow Reminder 1. Read the relevant skill (from decision tree above) 2. Review the skill's "Local Source Reference" section 3. Search the Effect source code for the API you need 4. Study the implementation and types 5. Write your code based on real implementations **See CLAUDE.local.md for complete source reference guide** ## References - Agent Skills overview: [Introducing Agent Skills](https://www.anthropic.com/news/skills) - Skills guide: [Claude Code Skills Documentation](https://docs.claude.com/en/docs/claude-code/skills) - **Local Patterns Hub**: [../effect-patterns-hub/SKILL.md](../effect-patterns-hub/SKILL.md) (130+ patterns) - **Pattern Documentation**: [../../docs/effect-patterns/](../../docs/effect-patterns/) - **AGENTS.md**: [../../AGENTS.md](../../AGENTS.md) (Effect best practices for AI agents) - EffectPatterns (upstream source): [PaulJPhilp/EffectPatterns](https://github.com/PaulJPhilp/EffectPatterns)

Frequently asked questions

Effect Index