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create_managed_agent

Register a reusable named agent with custom model, system instruction, tools, and environment for later invocation via create_interaction.

Instructions

Register a reusable named agent (invoke later via create_interaction(agent=agent_id)).

Args: agent_id: Unique identifier. Cannot start with reserved prefixes (antigravity-, gemini-, google-, etc). model: Model for agent_config (default gemini-3.6-flash). system_instruction: Persistent persona/behavior definition. tools: Default tools; falls back to code_execution, google_search, url_context if omitted. base_environment: Environment string/id or config dict (see build_environment_config); forked per invocation. description: Human-readable description.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
modelNogemini-3.6-flash
toolsNo
agent_idYes
descriptionNo
base_environmentNo
system_instructionNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden. It discloses reserved prefixes, default model/tools, and that base_environment is forked per invocation. Missing details on permissions or failure modes.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single concise paragraph with a clear list of arguments. Slightly dense but no wasted words; could benefit from clearer sectioning.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the output schema exists and the tool is complex, the description covers essential behavioral details and cross-references other tools, though it could mention validation or errors.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, but the description adds significant meaning for all 6 parameters: uniqueness constraints, default values, fallback behavior, and references to other config builders.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states 'Register a reusable named agent' with a specific verb and resource, and distinguishes from siblings like list/get/delete by focusing on creation and reuse.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It explicitly says 'invoke later via create_interaction(agent=agent_id)' and explains parameter defaults, but does not explicitly state when not to use or compare with alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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