Effect V4
Write, review, or upgrade Effect v4 code in the Composio CLI, cli-keyring, and...
Install
npx skills add ComposioHQ/composio --skill effect-v4 -g -a claude-code -y- Repository
- ComposioHQ/composio30.9k
- Category
- Design
- Updated
- 3d ago
- License
- MIT
- Context cost
- Lightabout 966 tokens
- Runs scripts
- Yes, review before use
What it does
Write, review, or upgrade Effect v4 code in the Composio CLI, cli-keyring, and json-schema-to-effect-schema packages, all pinned exactly to effect@4.0.5, Context.Service and explicit layers, Schema.TaggedError and typed recovery, the effect/cli command surface, and the vendored effect source oracle. Use when writing or reviewing Effect v4 code, answering a v4 API question, working in effect/cli, defining a Context.Service service, modeling an error with Schema.TaggedError, bumping the Effect pins, or verifying an unfamiliar API against ts/vendor/effect. Do not use for CLI command UX/wiring design (use cli-command) or CLI E2E tests (use cli-e2e).
Effect v4
The CLI, @composio/cli-keyring, and @composio/json-schema-to-effect-schema run on
Effect v4. Every claim below is grounded in the migrated source, not memory of v3.
Exact version matrix
effect, @effect/platform-bun, and @effect/vitest
are pinned to the same exact 4.0.5, never ^, @next, or a mismatched
version across packages. @effect/cli and @effect/platform no longer exist as
dependencies; their surfaces are consolidated into effect and effect/*.
See versions.json for the full matrix (also typescript, vitest).
Read next
- references/core-patterns.md, services, layers, typed
errors, Schema, choosing between
Effect.genandEffect.fn,Optioncombinators in place ofisSometernaries, driving time in tests withTestClock(fork, adjust until the fiber settles, join) instead ofit.live, and the v3→v4 rename table (labeled historical, for recognizing stale patterns). - references/cli-surface.md,
effect/cli:Command,Flag,Argument,GlobalFlag,CliConfig, the customCliOutput.Formatter, and the runner's double-print rule. - references/upgrade-workflow.md, procedure for bumping to a newer release.
References label source excerpts and standalone framework examples separately. Repo-linked
excerpts name the file checked by validate:cli-skills. The cited source remains authoritative
when an excerpt or explanation disagrees with the implementation.
