Claude Agent SDK project (agents-cli)

The agent is a ClaudeAgentOptions exported as root_agent from app/agent.py. There is no google.adk dependency and no ADK runner. Other google-agents-cli-* skills assume ADK; where they describe the agent itself, this skill wins.

Experimental. Deploy to agent_runtime (limits: references/claude.md) or cloud_run. The model runs on Claude on Gemini platform and must be enabled in Model Garden.

What ADK guidance maps to here

ADK guidance	This project
LlmAgent, Agent	ClaudeAgentOptions(model=..., system_prompt=..., ...) assigned to root_agent
Agent(name=...)	AGENT_NAME in app/app_utils/settings.py (ClaudeAgentOptions has no name); keep it equal to create_params.root_agent_name in agents-cli-manifest.yaml
google.adk.tools, FunctionTool	@tool(...) async functions, served by create_sdk_mcp_server and passed in mcp_servers
adk web, agents-cli playground	Unavailable (no SDK dev UI). Use agents-cli run, or uv run uvicorn app.fast_api_app:app --port 8080
ADK runner behind agents-cli run	agents-cli run runs root_agent in process
agents-cli eval dataset synthesize, eval optimize	Unavailable: both drive the agent through ADK. The command says so and exits
agents-cli eval generate --url (traces from a served agent)	Unavailable: the server speaks A2A, not ADK's /run_sse. eval generate runs root_agent in process; the command refuses --url
ADK sessions	Claude sessions, one per A2A conversation; scaffold with --session-type cloud_sql to keep them across instances

The contract

• app/agent.py exports root_agent: ClaudeAgentOptions. Only it changes when you change the agent.
• app/app_utils/claude.py runs it. Leave app/app_utils/ alone.
• The served agent's own CLAUDE.md, .claude/ and .mcp.json go in agent_config/.
• app/fast_api_app.py exposes app. Every deployment target runs uvicorn app.fast_api_app:app.

Adding a tool

@tool("lookup_order", "Look up an order by id.", {"order_id": str})
async def lookup_order(args: dict[str, Any]) -> dict[str, Any]:
    return {"content": [{"type": "text", "text": f"Order {args['order_id']}: shipped"}]}


server = create_sdk_mcp_server(name="orders", tools=[lookup_order])

root_agent = ClaudeAgentOptions(
    ...,
    mcp_servers={"orders": server},
    tools=[],  # no built-in Claude Code tools
    allowed_tools=["mcp__orders__lookup_order"],  # mcp__<server>__<tool>
)

A tool missing from allowed_tools is not available to the agent. Subagents (agents= or agent_config/.claude/agents/) run through the built-in Agent tool: add "Agent" to both tools and allowed_tools. Built-in tools (WebFetch, WebSearch, Read, Bash, ...) go in both tools and allowed_tools; keep Bash and file-editing tools out of a served agent unless the user asks.

Commands

agents-cli install                  # uv sync
agents-cli run "hello"              # run root_agent in process; prints a session id
agents-cli run "and?" --session-id <id>   # continue that conversation
agents-cli eval generate --dataset tests/eval/datasets/basic-dataset.json -o tests/eval/output/
agents-cli eval grade --traces tests/eval/output/<dataset>.json --config tests/eval/eval_config.yaml
agents-cli deploy
agents-cli scaffold enhance -d cloud_run --cicd-runner github_actions   # add infra later

run, eval generate, publish gemini, playground, eval dataset and eval optimize are overridden by agents-cli-extension.yaml at the project root. Prefix any command with AGENTS_CLI_DISABLE_OVERRIDES=1 to reach the built-in instead.

Serving

A2A: JSON-RPC at POST /a2a/app, card at /a2a/app/.well-known/agent-card.json, health at /health; over A2A, text streams as it is generated. On Agent Runtime, also :query and :streamQuery (new sessions and turns), which agents-cli run --mode adk and an ingress Agent Gateway use. See references/claude.md for sessions, telemetry and deployment.

Common mistakes

• Renaming root_agent or app, which breaks run, eval and deploy.
• Leaving tools unset: the agent then gets every built-in Claude Code tool.
• Using a model id that is not enabled on Gemini platform for the project.
• Reaching for eval dataset synthesize or eval optimize: they need ADK. Write cases into tests/eval/datasets/ and use eval generate + eval grade.
• Expecting /run_sse or ADK's REST session routes; this server serves A2A and Agent Runtime's :query / :streamQuery.

References

• references/claude.md — how a turn runs, model access, project settings, sessions, calling other agents, telemetry and logs.
• references/migrate-claude-agent.md — moving an existing Claude Agent SDK agent into this project and onto GCP.
• references/migrate-from-aws.md — extra migration steps for an agent running on AWS.