agent-sdk/typescript / documentation change

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843| Field | Required | Description |

844| :------------------------------------ | :------- | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

845| `description` | Yes | Natural language description of when to use this agent |

846| `tools` | No | Array of allowed tool names. If omitted, inherits every [tool available to subagents](/docs/en/sub-agents#available-tools). To preload Skills into the agent's context, use the `skills` field rather than listing `'Skill'` here |

847| `disallowedTools` | No | Array of tool names to explicitly disallow for this agent. MCP server-level patterns are also accepted: `mcp__server` or `mcp__server__*` removes every tool from that server, and `mcp__*` removes every MCP tool from any server |

848| `prompt` | Yes | The agent's system prompt |

849| `model` | No | Model override for this agent. Accepts an alias such as `'fable'`, `'opus'`, `'sonnet'`, `'haiku'`, `'inherit'`, or a full model ID. `'inherit'` uses the main model. If omitted, the agent uses the default subagent model ([`CLAUDE_CODE_SUBAGENT_MODEL`](/docs/en/model-config#environment-variables)) when one is configured, otherwise the main model |

850| `mcpServers` | No | MCP server specifications for this agent |

851| `skills` | No | Array of skill names to preload into the agent context |

852| `initialPrompt` | No | Auto-submitted as the first user turn when this agent runs as the main thread agent |

853| `maxTurns` | No | Maximum number of agentic turns (API round-trips) before stopping |

854| `background` | No | Run this agent as a non-blocking background task when invoked |

855| `memory` | No | Memory source for this agent: `'user'`, `'project'`, or `'local'` |

856| `effort` | No | Reasoning effort level for this agent. Accepts a named level or an integer |

857| `permissionMode` | No | Permission mode for tool execution within this agent. See [`PermissionMode`](#permissionmode) |

858| `criticalSystemReminder_EXPERIMENTAL` | No | Experimental: Critical reminder added to the system prompt |

843| Field | Required | Description |

845| `description` | Yes | Natural language description of when to use this agent |

848| `prompt` | Yes | The agent's system prompt |

849| `model` | No | Model override for this agent. Accepts an alias such as `'fable'`, `'opus'`, `'sonnet'`, `'haiku'`, `'inherit'`, or a full model ID. `'inherit'` uses the main model. When you omit it, Claude Code picks the model in the [subagent model order](/docs/en/sub-agents#choose-a-model) |