Claude Code CLI

Claude Code is the high-performance CLI authorized by Anthropic for direct terminal-based interaction with Claude models. By integrating the CLI with Sypha, you can leverage your existing terminal authentication without managing decentralized API keys.

Official Site: Claude Code Setup Guide

Installation & Environment Setup

1. Initialize the CLI: Follow the deployment instructions in the Official Anthropic Documentation.
2. Authorize Session: Execute claude in your terminal to begin the authentication cycle. You can authenticate via the Anthropic Console, corporate identity providers (SSO), or through enterprise gateways like Amazon Bedrock and Google Vertex AI.
3. Verification: Confirm a successful installation by executing claude --version.

[!WARNING] Like most Anthropic SDKs, the CLI can utilize the ANTHROPIC_API_KEY environment variable. If this variable is active on your system, Sypha will utilize those credentials to authorize the CLI interactions.

Authorized Model Registry

Sypha supports the full spectrum of high-logic engines via the Claude Code CLI:

• Claude 3.7 & 3.5 Sonnet: The industry standard for balanced speed and reasoning.
• Claude 3.5 Haiku: Optimized for ultra-fast, low-latency construction.
• Claude Opus 4/4.1: Specialised for the most complex architectural challenges.

Configuring Sypha

1. Activate Configuration: Select the gear icon in the Sypha panel.
2. Set Provider: Choose Claude Code from the provider registry.
3. Assign Model: Pick your intended Claude engine from the selector.
4. (Optional) Specialized Paths: If your CLI is installed in a non-standard directory, define the absolute path to the claude executable in the "Claude Code Path" field.

Strategic Advantages

• Keyless Authentication: Utilise your existing terminal-based login for a streamlined, key-free experience.
• Consolidated Billing: Interaction costs are centralized within your Anthropic account and reported directly through the CLI.
• Deep Reasoning Logic: Seamless support for Claude’s "Think-Before-Respond" modes and structured logic chains.
• Enhanced Construction: Sypha’s Advanced Context Enhancement tools are fully compatible with CLI-driven workflows.

Common Resolution Steps

• Process Errors: Verify the CLI is fully authenticated via claude auth login.
• Subscription Verification: Ensure your current plan authorizes access to the specific model selected.
• Path Resolution: On local environments, utilise absolute paths (e.g., /usr/local/bin/claude or C:\tools\claude.exe) if the standard command is not found.