Claude Code

Adapter for Anthropic's **Claude Code** CLI.

Install

adapters install claude

Minimum CLI version: 1.0.0. Supported on macOS, Linux and Windows.

Auth

Two auth methods are supported:

• **API key** — set ANTHROPIC_API_KEY in your environment.
• **Browser login** — run claude once interactively to complete OAuth.

Credentials live in ~/.claude/settings.json.

Minimal run

adapters run claude --prompt "Summarize README.md"

Programmatic:

import { createClient } from '@a5c-ai/adapters';
const client = createClient();
const handle = await client.run({ agent: 'claude', prompt: 'Hello' });
for await (const ev of handle.events()) console.log(ev);

Notable flags

The adapter forwards these RunOptions to the CLI:

• --output-format jsonl (always, for streaming parse)
• --model <id> — e.g. claude-sonnet-4-20250514 or claude-opus-4-20250514
• --resume <sessionId> — resume a prior session
• Thinking effort: low | medium | high | max
• Approval modes: yolo, prompt, deny

Session files

• Location: ~/.claude/projects/<project-hash>/*.jsonl
• Format: JSONL, one event per line
• Resume and fork are both supported (canResume, canFork).

Plugins

Plugin support: **yes**. Claude Code has a full plugin ecosystem with marketplace.

Native Plugin Management

adapters plugin install claude <plugin>
adapters plugin list claude
adapters plugin marketplace claude

MCP Servers

adapters mcp install claude <mcp-server>
adapters mcp list claude

Registry: https://modelcontextprotocol.io for MCP servers. Plugin marketplace: Available through claude plugins marketplace.

Capabilities

Streaming text, tool calls and thinking; parallel tool calls; image input; file attachments; subagent dispatch (up to 10 parallel). Supports Skills and AGENTS.md.

Known limitations

• Image **output** is not supported.
• Tool approval is required by default — use approvalMode: 'yolo' to auto-approve in trusted environments.
• Session file paths are keyed by a hash of the project directory; moving a repo invalidates resume.