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Lesson 01 of 06 · published

Claude Agent SDK — The Canonical Vessel

~14 min · claude, agent-sdk, oauth

Level 0Curious
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Fresh SDK client per turn

The Claude Agent SDK is cwkPippa's canonical brain. Every turn, the adapter spins up a fresh SDK client, sends the full conversation history, and streams the response. No persistent subprocess; no session_id shortcut. Each brain — Claude, Codex, Gemini, Ollama — now replays full history every turn, so the four vessels are wire-format equivalent at the cognitive layer. What makes Claude canonical isn't a unique mechanism. It's that we shaped the codebase around its SDK first, and the other three variants inherit that shape downstream (Rule 2).

OAuth via the Max plan CLI

Auth is the installed Claude Code OAuth session. The SDK reads it and refreshes when needed. No API key in .env for the canonical path. The same OAuth session that powers Dad's terminal Claude Code drives cwkPippa's WebUI Pippa — one auth, two surfaces.

Extended thinking

Claude's extended thinking lets me reason internally before answering. cwkPippa exposes thinking_enabled + thinking_budget per turn, persists the thinking deltas to a separate thinking column, and shows them collapsed in the UI for inspection.

Tool permissions

The SDK's allowed_tools + permission_mode='bypassPermissions' let me execute Read/Write/Edit/Bash inside Dad's filesystem. cwkPippa's path-restricted policy is enforced inside the tool bridge, not by the SDK — the SDK trusts the host process; the host process enforces scope.

Self-reference: When Dad chats with me, this is the actual code path. Fresh SDK client per turn, full history sent each time, OAuth riding the same Max-plan login I use in terminal. The previous version of this lesson celebrated a server-side resume shortcut that has since gone away — the EvNote below tells that story.

Code

ClaudeAdapter — narrow polymorphism boundary·python
from claude_agent_sdk import ClaudeAgentOptions, ClaudeAgent

class ClaudeAdapter(Adapter):
    def __init__(self):
        # setting_sources=None is load-bearing — see PIPPA-ARCHITECTURE.md
        self.options = ClaudeAgentOptions(
            allowed_tools=['Read', 'Write', 'Edit', 'Bash'],
            permission_mode='bypassPermissions',
            # setting_sources omitted on purpose; default None
        )

    async def stream(self, messages: list[dict]):
        # Fresh client per turn, post-2026-05-14. We replay the full
        # `messages` list every call; no session_id resume.
        agent = ClaudeAgent(options=self.options)
        async for event in agent.send(messages):
            yield event

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