chore: rename composer package arcp/arcp -> arcp/sdk

Aligns Packagist package name with the consistent sdk naming used
across the other ARCP language SDKs. Updates composer.json, the
publish workflow, README, CONTRIBUTING, and docs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: nficano

.github/workflows/publish.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     environment: packagist
     env:
-      PACKAGE_NAME: arcp/arcp
+      PACKAGE_NAME: arcp/sdk
       REPOSITORY_URL: https://github.com/agentruntimecontrolprotocol/php-sdk
       PACKAGIST_USERNAME: ${{ secrets.PACKAGIST_USERNAME }}
       PACKAGIST_TOKEN: ${{ secrets.PACKAGIST_TOKEN }}

CONTRIBUTING.md

@@ -1,4 +1,4 @@
-# Contributing to arcp/arcp
+# Contributing to arcp/sdk
 
 Thanks for your interest in improving the PHP SDK for ARCP. This
 document covers how to report issues, propose changes, and get a change merged.
@@ -129,7 +129,7 @@ the changelog. Prefer clarity over cleverness in a library others build on.
 ## Releases
 
 Releases are cut by maintainers. The package is published to
-[Packagist](https://packagist.org/packages/arcp/arcp); pushing a
+[Packagist](https://packagist.org/packages/arcp/sdk); pushing a
 `v*` tag (for example `v1.1.0`) triggers the `publish` GitHub Actions
 workflow, which validates the Composer metadata, builds the archive,
 and notifies Packagist. The SDK is versioned with

README.md

@@ -3,9 +3,9 @@
 <p align="center"><strong>PHP SDK for the Agent Runtime Control Protocol (ARCP) — submit, observe, and control long-running agent jobs from PHP.</strong></p>
 
 <p align="center">
-  <a href="https://packagist.org/packages/arcp/arcp"><img alt="Packagist" src="https://img.shields.io/packagist/v/arcp/arcp.svg"></a>
+  <a href="https://packagist.org/packages/arcp/sdk"><img alt="Packagist" src="https://img.shields.io/packagist/v/arcp/sdk.svg"></a>
   <a href="https://github.com/agentruntimecontrolprotocol/php-sdk/actions/workflows/test.yml"><img alt="CI" src="https://github.com/agentruntimecontrolprotocol/php-sdk/actions/workflows/test.yml/badge.svg"></a>
-  <a href="https://packagist.org/packages/arcp/arcp"><img alt="PHP version" src="https://img.shields.io/packagist/php-v/arcp/arcp.svg"></a>
+  <a href="https://packagist.org/packages/arcp/sdk"><img alt="PHP version" src="https://img.shields.io/packagist/php-v/arcp/sdk.svg"></a>
   <a href="https://github.com/agentruntimecontrolprotocol/spec/blob/main/docs/draft-arcp-1.1.md"><img alt="ARCP" src="https://img.shields.io/badge/ARCP-v1.1%20draft-blue"></a>
   <a href="LICENSE"><img alt="License" src="https://img.shields.io/badge/license-Apache--2.0-lightgrey"></a>
   <a href="https://coderabbit.ai"><img alt="CodeRabbit" src="https://img.shields.io/coderabbit/prs/github/agentruntimecontrolprotocol/php-sdk?utm_source=oss&utm_medium=github&utm_campaign=agentruntimecontrolprotocol/php-sdk&labelColor=171717&color=FF570A&label=CodeRabbit+Reviews"></a>
@@ -22,7 +22,7 @@
 
 ---
 
-`arcp/arcp` is the PHP reference implementation of [ARCP](https://github.com/agentruntimecontrolprotocol/spec/blob/main/docs/draft-arcp-1.1.md), the Agent Runtime Control Protocol. It covers both sides of the wire — `Arcp\Client\ARCPClient` for submitting and observing jobs, `Arcp\Runtime\ARCPRuntime` for hosting agents — so either side can talk to any conformant peer in any language without hand-rolling the envelope, sequencing, or lease enforcement.
+`arcp/sdk` is the PHP reference implementation of [ARCP](https://github.com/agentruntimecontrolprotocol/spec/blob/main/docs/draft-arcp-1.1.md), the Agent Runtime Control Protocol. It covers both sides of the wire — `Arcp\Client\ARCPClient` for submitting and observing jobs, `Arcp\Runtime\ARCPRuntime` for hosting agents — so either side can talk to any conformant peer in any language without hand-rolling the envelope, sequencing, or lease enforcement.
 
 ARCP itself is a transport-agnostic wire protocol for long-running AI agent jobs. It owns the parts of agent infrastructure that don't change between products — sessions, durable event streams, capability leases, budgets, resume — and stays out of the parts that do. ARCP wraps the agent function; it does not define how agents are built, how tools are exposed (that's MCP), or how telemetry is exported (that's OpenTelemetry).
 
@@ -31,7 +31,7 @@ ARCP itself is a transport-agnostic wire protocol for long-running AI agent jobs
 Requires PHP 8.4 or newer and Composer 2.x. The SDK ships as a single Composer package; the `bin/arcp` CLI is registered automatically so `vendor/bin/arcp` is available in any project that pulls it in.
 
 ```sh
-composer require arcp/arcp
+composer require arcp/sdk
 ```
 
 The `pdo_sqlite`, `mbstring`, and `json` extensions are required (all bundled with most PHP distributions). The runtime uses [Amp v3](https://amphp.org/) + fibers; no extra extension is needed for async.

composer.json

@@ -1,5 +1,5 @@
 {
-    "name": "arcp/arcp",
+    "name": "arcp/sdk",
     "description": "PHP reference implementation of the Agent Runtime Control Protocol (ARCP) v1.1",
     "type": "library",
     "license": "Apache-2.0",

composer.lock

@@ -14,7 +14,7 @@ the runtime, client, transports, and protocol features.
 - [Getting started](./getting-started.md) - install, create an in-process runtime + client, run the checks.
 - [Architecture](./architecture.md) - how the PHP namespaces fit together.
 - [Transports](./transports.md) - WebSocket, stdio, and memory transports.
-- [CLI](./cli.md) - the `bin/arcp` command shipped by `arcp/arcp`.
+- [CLI](./cli.md) - the `bin/arcp` command shipped by `arcp/sdk`.
 
 ## Guides (one per spec section)
 
@@ -35,7 +35,7 @@ the runtime, client, transports, and protocol features.
 
 The TypeScript SDK has package-specific docs because its code is split
 across multiple npm packages. PHP ships as one Composer package,
-`arcp/arcp`, so this documentation follows the namespace layout under
+`arcp/sdk`, so this documentation follows the namespace layout under
 `src/`.
 
 | Namespace | Purpose |

docs/README.md

@@ -1,6 +1,6 @@
 # Architecture
 
-The PHP SDK is a single Composer package, `arcp/arcp`, with namespaces
+The PHP SDK is a single Composer package, `arcp/sdk`, with namespaces
 that map to the same layers as the TypeScript SDK packages.
 
 ## Layering

docs/architecture.md

@@ -17,7 +17,7 @@ composer install
 As a dependency:
 
 ```sh
-composer require arcp/arcp
+composer require arcp/sdk
 ```
 
 ## In-process demo (no network)