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163163
164164 <MultiFileExample language="cli" label="CLI">
165165 ```bash CLI
166 AGENT_ID=$(ant beta:agents create --transform id --raw-output < coding-assistant.agent.yaml)
167
168 echo "Agent ID: $AGENT_ID"
166 ant apply coding-assistant.md
169167 ```
170168
171 <File filename="coding-assistant.agent.yaml">
172 ```yaml
169 <File filename="coding-assistant.md">
170 ```markdown
171 ---
173172 name: Coding Assistant
174 model:
175 id: claude-opus-5
176 system: You are a helpful coding assistant. Write clean, well-documented code.
173 model: claude-opus-5
177174 tools:
178175 - type: agent_toolset_20260401
176 ---
177
178 You are a helpful coding assistant. Write clean, well-documented code.
179179 ```
180180 </File>
181181 </MultiFileExample>
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336336
337337 The `agent_toolset_20260401` tool type enables the full set of pre-built agent tools (bash, file operations, web search, and more). See [Tools](https://platform.claude.com/docs/en/managed-agents/tools) for the complete list and per-tool configuration options.
338338
339 Save the returned `agent.id`. You'll reference it in every session you create.
339 Save the returned `agent.id` (the CLI's [`ant apply`](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/scripting#version-controlling-api-resources) prints it and records it in `claude-lock.json`). You'll reference it in every session you create.
340340 </Step>
341341
342342 <Step title="Create an environment">
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368368
369369 <MultiFileExample language="cli" label="CLI">
370370 ```bash CLI
371 ENVIRONMENT_ID=$(ant beta:environments create --transform id --raw-output < quickstart.environment.yaml)
372
373 echo "Environment ID: $ENVIRONMENT_ID"
371 ant apply environment.yaml
374372 ```
375373
376 <File filename="quickstart.environment.yaml">
374 <File filename="environment.yaml">
377375 ```yaml
378376 name: quickstart-env
379377 config:
from line 464
466464 ```
467465 </CodeGroup>
468466
469 Save the returned `environment.id`. You'll reference it in every session you create.
467 Save the returned `environment.id` (also in `claude-lock.json` if you used `ant apply`). You'll reference it in every session you create.
470468
471469 <Tip>
472470 To run the sandbox on your own infrastructure instead of a cloud sandbox, see