happy-wire

This document describes the shared wire package: @slopus/happy-wire.

Why this package exists

Before happy-wire, wire-level message and session-protocol schemas were duplicated across packages (CLI, app, server, and agent). That caused drift risk and made protocol evolution harder.

@slopus/happy-wire centralizes those shared schemas and types so all clients and services agree on the same wire contract.

Package identity

• npm name: @slopus/happy-wire
• workspace path: packages/happy-wire
• package type: publishable library (not private)
• versioned dependency in consumers: ^0.1.0

What is shared

1. Wire message schemas

Shared from @slopus/happy-wire:

• from messages.ts: SessionMessageContentSchema, SessionMessageSchema, MessageMetaSchema, SessionProtocolMessageSchema, MessageContentSchema (top-level role union: user|agent|session), UpdateNewMessageBodySchema, UpdateSessionBodySchema, UpdateMachineBodySchema, CoreUpdateContainerSchema
• from legacyProtocol.ts: UserMessageSchema (role: 'user'), AgentMessageSchema (role: 'agent'), LegacyMessageContentSchema (role-discriminated union for legacy only)

These are used for encrypted message/update contracts (new-message, update-session, update-machine).

2. Session protocol schema

Shared from @slopus/happy-wire:

• sessionEventSchema
• sessionEnvelopeSchema
• createEnvelope(...)
• SessionEnvelope and related types

This is the canonical schema for the unified session protocol event stream.

Current role set in sessionEnvelopeSchema:

• 'user' (user-originated envelope)
• 'agent' (agent/system output envelopes)

Current session wire payload shape (decrypted message body):

• outer message role is always 'session' for session-protocol records
• content is the session envelope object directly (not wrapped under content.data)
• envelope-level role remains inside content.role ('user' | 'agent')
• envelope timestamp is required as content.time (Unix ms)

User text rollout toggle:

• env flag: ENABLE_SESSION_PROTOCOL_SEND (truthy: 1, true, yes)
• default (disabled):
  • CLI still emits modern user payloads (role = 'session', content.role = 'user')
  • app consumes legacy user payloads (role = 'user', content.type = 'text') and drops modern user payloads
• enabled:
  • CLI emits modern user payloads (role = 'session', content.role = 'user')
  • app consumes modern user payloads and drops legacy user payloads

Migration in this repository

CLI (packages/happy-cli)

• Session protocol imports now reference @slopus/happy-wire directly.
• src/sessionProtocol/types.ts now re-exports from @slopus/happy-wire as compatibility shim.
• API wire schemas in src/api/types.ts now source shared message/update schemas from @slopus/happy-wire.

App (packages/happy-app)

• Shared API message/update schemas in sources/sync/apiTypes.ts now import these from @slopus/happy-wire:
  • ApiMessageSchema
  • ApiUpdateNewMessageSchema
  • ApiUpdateSessionStateSchema
  • ApiUpdateMachineStateSchema

Server (packages/happy-server)

• Prisma JSON message content type now references SessionMessageContent from @slopus/happy-wire.
• Event router uses shared SessionMessageContent type for new-message payload typing.

Agent (packages/happy-agent)

• RawMessage now aliases SessionMessage from @slopus/happy-wire.

Versioning model

All other workspace packages now declare a versioned dependency on @slopus/happy-wire.

This intentionally mirrors post-publish consumption and reduces hidden coupling to workspace-local files.

Build and release

@slopus/happy-wire is configured the same way as existing publishable libraries in this repo:

• ESM/CJS/types outputs via pkgroll
• build: typecheck + bundle
• test: build + vitest
• prepublishOnly: build + test
• release: release-it
• npm publish registry configured via publishConfig

Use the same release entrypoint as other publishable packages:

yarn release
# choose happy-wire

or:

yarn workspace @slopus/happy-wire release

When building workspaces from a clean checkout, build @slopus/happy-wire first so dependent packages can resolve generated dist outputs.

Publish checklist (maintainer)

1. Ensure all workspace builds/tests are green.
2. Confirm wire schema changes are backward-compatible or documented.
3. Bump and release @slopus/happy-wire.
4. Update downstream package versions if needed.
5. Publish dependent package updates only after the new happy-wire version is available.

Notes

• happy-wire should stay focused on wire contracts only (types + Zod schemas + small helpers).
• Domain/business logic should remain in consumer packages.
• Keep schema additions additive where possible to minimize client breakage.