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Effect Schema

Effect Schema as the one validation and typing layer for data crossing a trust boundary (requests, config, storage, third-party and LLM output), with branded ids, tagged errors, JSON Schema for tools, and round-trip plus property tests.

Category: tooling

In your existing repository

Ask your agent to check compatibility, follow this fragment’s brief, and verify the resulting project. What happens next

Applies to:
astro-blog, astro-fullstack, cloudflare-react-router, mobile-expo, python-react, react-router, tauri-react, typescript-api, typescript-cli

Add to your project

Paste the prompt into the coding agent working on your project.

View prompt
Add the effect-schema fragment to this existing repository. 1. Run npx @steamfield/stacks show effect-schema --json and check that it fits the project. If it does not, explain why before changing files. 2. Run npx @steamfield/stacks add effect-schema and follow the brief it prints. 3. In this repository, run npx @steamfield/stacks verify. Fix failures without weakening or skipping verification steps. 4. Summarize what changed and the verification result. Quote published stats only when they are available, including their interval and sample size. The stacks docs, written for agents, are at https://stacks.steamfield.io/llms.txt.
Or use the terminal
npx @steamfield/stacks add effect-schema
Verify steps
StepPhaseLayerCommand

No additional verify steps declared. Run the project’s existing verification after applying the brief.

Use with a new stack

Starting fresh instead? These stacks support this fragment.

  • astro-blogoptional
    npx @steamfield/stacks new astro-blog --with effect-schema
  • astro-fullstackoptional
    npx @steamfield/stacks new astro-fullstack --with effect-schema
  • mobile-expooptional
    npx @steamfield/stacks new mobile-expo --with effect-schema
  • python-reactoptional
    npx @steamfield/stacks new python-react --with effect-schema
  • cloudflare-react-routeroptional
    npx @steamfield/stacks new cloudflare-react-router --with effect-schema
  • react-routeroptional
    npx @steamfield/stacks new react-router --with effect-schema
  • tauri-reactoptional
    npx @steamfield/stacks new tauri-react --with effect-schema
  • typescript-clioptional
    npx @steamfield/stacks new typescript-cli --with effect-schema
  • typescript-apioptional
    npx @steamfield/stacks new typescript-api --with effect-schema

Alternatives in tooling

  • Effect testing and API skill

    Effect testing with @effect/vitest (fresh real layers per test, TestClock instead of sleeps, typed failure and defect assertions), shipped Effect guidance for each agent, and an agent skill written from the installed Effect release's declarations.

    Also applies to: astro-blog, astro-fullstack, mobile-expo, python-react, cloudflare-react-router, react-router, tauri-react, typescript-cli, typescript-api

  • Git hooks (lefthook)

    lefthook git hooks that format and lint staged files, enforce Conventional Commits, and run the project's tests before push.

    Also applies to: astro-blog, astro-fullstack, mobile-expo, python-react, cloudflare-react-router, react-router, tauri-react, typescript-cli, typescript-api

  • OpenTelemetry (OTLP) for Effect servers

    OpenTelemetry traces, logs and metrics over OTLP for the Effect server in typescript-api, astro-fullstack and react-router. One observability layer adds trace ids to the existing logs, exports nothing without an endpoint, and is tested with an in-memory tracer and a loopback OTLP receiver.

    Also applies to: astro-fullstack, react-router, typescript-api

  • REST resource conventions

    Agent rules for naming and shaping HTTP resources (plural nouns, methods and status codes, one resource shape, cursor pagination, versioning), independent of framework and layout, plus an AGENTS.md section recording the project's choices.

    Also applies to: astro-fullstack, mobile-expo, python-react, typescript-api

  • rr remote test runner

    Configures rr (github.com/rileyhilliard/rr) so the project's test, lint, and build commands can run on remote machines over SSH, with a committed .rr.yaml of named tasks, an AGENTS.md section, and the rr Claude Code plugin.

    Also applies to: astro-blog, astro-fullstack, mobile-expo, python-react, cloudflare-react-router, react-router, tauri-react, typescript-cli, typescript-api

Files

This fragment supplies instructions rather than project files.

Usage

Among stacks projects in the 28 days through 30 Oct 2026: Project count: not enough runs yet; Green rate: not enough runs yet.

Weekly projects by stack

Projects whose final fragment set included this fragment, grouped by stack.

Not enough runs in this breakdown yet.

Stacks projects per UTC week through 30 Oct 2026. Published stack counts only.

By stack

How often this fragment stays in a default composition, or gets attached as an option.

Not enough runs in this breakdown yet.

Stacks projects · 28 days through 30 Oct 2026. Counts rounded to 5.

Green rate with and without it

This compares projects; it isn't an effect of the fragment.

Not enough runs in this breakdown yet.

Stacks projects · 28 days through 30 Oct 2026. Counts rounded to 5.

Often used with

Co-occurrence above the baseline, within a stack. Required fragment pairs are excluded.

Not enough runs in this breakdown yet.

Stacks projects · 28 days through 30 Oct 2026. Counts rounded to 5.

Computed 31 Oct 2026, through 30 Oct 2026. Numbers describe stacks projects, not the ecosystem.