# Sideband

> Browser ↔ local daemon without WebSocket code.

A drop-in SDK that lets browsers talk to local daemons reliably – no reconnect logic, no NAT hacks, no exposed ports. E2EE by default.

## Table of Contents

### Guide

- [Getting Started](/guide.md)
- [Core Concepts](/guide/concepts.md)
- [RPC](/guide/rpc.md)
- [Events](/guide/events.md)
- [Server](/guide/server.md)
- [E2EE Relay (SBRP)](/guide/e2ee.md)
- [Testing](/guide/testing.md)
- [Self-Hosting the Relay](/guide/self-hosting.md)

### SDK

- [SDK Design](/sdk.md)
- [RFC: @sideband/peer SDK](/sdk/peer.md)

### Runtime

- [Runtime Behavioral Contracts](/runtime.md)
- [Session Lifecycle](/runtime/session.md)
- [Message Routing](/runtime/router.md)

### Protocols

- [Protocols](/protocols.md)
- [Sideband Protocol (SBP)](/protocols/sbp.md)
- [Sideband Relay Protocol (SBRP)](/protocols/sbrp.md)
- [Sideband Direct Protocol (SBDP)](/protocols/sbdp.md)
- [RPC Layer](/protocols/rpc.md)

### ADRs

- [Architecture Decision Records](/adr.md)
- [ADR-001: Protocol Versioning & Compatibility](/adr/001-protocol-versioning-and-compatibility.md)
- [ADR-002: Naming Matrix for Protocol Types](/adr/002-naming-matrix.md)
- [ADR-003: Control Frame Type Invariants](/adr/003-control-frame-invariants.md)
- [ADR-004: Binary FrameId Representation](/adr/004-binary-frameid.md)
- [ADR-005: Transport ABI Package](/adr/005-transport-abi.md)
- [ADR-006: Canonical RPC Envelope over MessageFrame](/adr/006-rpc-envelope.md)
- [ADR-007: Immutable Decoded Frame Types](/adr/007-immutable-frame-types.md)
- [ADR-008: Enforce Channel Subject Validation at the Protocol Layer](/adr/008-subject-namespace-validation.md)
- [ADR-009: Runtime Session Lifecycle](/adr/009-runtime-peer-lifecycle.md)
- [ADR-010: Explicit RPC Correlation via `cid` in the Envelope](/adr/010-rpc-correlation-cid.md)
- [ADR-011: Runtime Message Routing](/adr/011-runtime-message-routing.md)
- [ADR-012: WebSocket Transport Design Decisions](/adr/012-websocket-transport-design.md)
- [ADR-013: Peer SDK Core Design Decisions](/adr/013-peer-sdk-design.md)
- [ADR-014: Peer SDK Session Signal Handling](/adr/014-peer-session-signals.md)
- [ADR-015: P2P Direct Protocol (SBDP)](/adr/015-p2p-direct-protocol.md)
- [ADR-016: Relay Server Design](/adr/016-relay-server-design.md)

### Other

- [ADR-017: Cloud SDK Design](/adr/017-cloud-sdk-design.md)
- [ADR-018: Daemon Built-in Capabilities and `$sideband/*` Namespace](/adr/018-daemon-capabilities.md)
- [ADR-NNN: \[Short Title]](/adr/_template.md)
- [Control Codes](/protocols/sbrp/control-codes.md)
- [Cryptography and Wire Format](/protocols/sbrp/wire-crypto.md)
- [Documentation](/README.md)
- [Error Code Registry](/protocols/error-codes.md)
- [Package Architecture](/architecture/packages.md)
- [Project Structure](/architecture/project-structure.md)
- [Protocol Architecture](/protocols/stack.md)
- [Protocol Documentation Guidelines](/protocols/authoring.md)
- [Protocol Glossary](/protocols/glossary.md)
- [Relay Authentication](/protocols/sbrp/authentication.md)
- [RPC Behavior](/protocols/rpc/behavior.md)
- [RPC Conformance](/protocols/rpc/conformance.md)
- [RPC Envelope Specification](/protocols/rpc/envelope.md)
- [RPC Streaming](/protocols/rpc/streams.md)
- [SBDP Design](/protocols/sbdp/design.md)
- [SBP Behavior & Ordering (v1)](/protocols/sbp/behavior.md)
- [SBP Conformance Tests (v0.1 plan)](/protocols/sbp/conformance.md)
- [SBP Error Model (v1)](/protocols/sbp/errors.md)
- [SBP Wire Format (v1)](/protocols/sbp/wire-format.md)
- [SBRP Conformance Checklist](/protocols/sbrp/conformance.md)
- [Security Checklist](/protocols/sbrp/security-checklist.md)
- [Sideband Relay Protocol State Machine](/protocols/sbrp/state-machine.md)
- [Threat Model](/protocols/sbrp/threat-model.md)
- [Transport ABI](/protocols/transport/abi.md)
- [Transport Conformance](/protocols/transport/conformance.md)
- [Transport Errors](/protocols/transport/errors.md)
- [WebSocket Transport](/protocols/transport/websocket.md)
- [Why Sideband?](/why-sideband.md)