flyteplugins-agents-claude 2.5.9

Run Claude Agent SDK agents on Flyte.

flyteplugins-agents-claude

Run Claude Agent SDK agents on Flyte. You keep writing Claude agents; Flyte is the runtime underneath.

pip install flyteplugins-agents-claude

import flyte
from flyteplugins.agents.claude import tool, run_agent

env = flyte.TaskEnvironment(
    "claude-agent",
    secrets=[flyte.Secret(key="anthropic_api_key", as_env_var="ANTHROPIC_API_KEY")],
)

@tool
@env.task(cache="auto", retries=3)
async def get_weather(city: str) -> str:
    """Get the current weather for a city."""
    return f"The weather in {city} is sunny, 22°C."

@env.task(report=True, retries=3)
async def city_agent(question: str) -> str:
    return await run_agent(question, tools=[get_weather], model="claude-sonnet-4-5")

How it maps to Flyte

• Tools are in-process MCP tools (the SDK's own @tool/SdkMcpTool); our tool wraps an @env.task so that when Claude calls it, the task runs as a durable Flyte child action (its own container/resources, retries, caching). The input schema is derived via the Flyte type engine.
• The loop runs in the Claude Code runtime. run_agent runs that loop inside your @env.task, streams the messages, and renders the timeline (assistant turns, tool calls, cost) into the task report.

Durability

Two layers, both real:

• Tool calls are durable Flyte child actions (own container/resources, retries, caching) — always, regardless of durable.
• The conversation survives a crash. With durable=True, run_agent wires the Claude SDK's own session mirror + resume onto a flyte.Checkpoint: a deterministic session_id (derived from the task's action, so it's stable across retries) is pinned on the first attempt, and on a retry the prior attempt's transcript is restored from the checkpoint and the run resumes instead of restarting.

We delegate to the SDK's resume because the model loop runs in the Claude Code runtime (a subprocess Flyte doesn't intercept), so a model turn can't be a flyte.trace leaf the way it is for other client-side SDKs. Session resume is the coarser-grained equivalent — whole-session, not per-turn — and it no-ops cleanly when there's no checkpoint context (e.g. local runs).

Observability

run_agent renders a timeline into the task report (report=True): the assistant turns from the streamed messages, plus each tool's outcome — PostToolUse / PostToolUseFailure hooks record the result or error the message stream doesn't surface. If you pass your own ClaudeAgentOptions(hooks=...), ours are merged in, not substituted.

Runtime

The claude-agent-sdk wheel bundles the native claude CLI (a per-platform binary, ~250 MB — including the manylinux wheel), so pip install flyteplugins-agents-claude is all the runtime image needs.

Memory

Pass memory_key (a user/thread id) for cross-run memory — the agent resumes the same conversation across separate runs:

await run_agent(message, model="claude-sonnet-4-5", memory_key="user-alice")

The transcript is persisted to a durable, keyed MemoryStore and resumed via the SDK's session-mirror on the next run with the same key — which also covers crash-resume, so it supersedes the per-run durable checkpoint.

Examples

See examples/:

• claude_durable_agent.py — a single durable agent: tools as Flyte tasks, tool outcomes + assistant turns in the report.
• claude_crash_resume.py — crash & resume: the task crashes on its first attempt; on retry the conversation resumes from the flyte.Checkpoint-backed session and completed tool calls are cache hits. Run on a backend to see resume.
• claude_multi_agent.py — multi-agent orchestration: a planner agent decomposes a topic, researcher agents fan out in parallel, an editor agent synthesizes — each agent its own durable action.
• claude_hitl.py — human-in-the-loop: a sensitive issue_refund tool pauses on a Flyte condition (flyte.new_condition) for a human to approve before it runs — a durable gate the agent SDK has no equivalent for.
• claude_memory.py — cross-run memory: two separate runs share a memory_key; the agent learns a fact in run 1 and recalls it in run 2.
• claude_handoffs.py — native subagent delegation: a triage prompt delegates to a billing or technical-support subagent, the whole run durable on Flyte.

Conformance

This adapter passes the shared flyteplugins.agents.core.testing.assert_adapter_conforms check — the same one every adapter runs — so it follows the common format (tool + run_agent, tool tasks wired to the resolver) despite a very different underlying SDK shape.