Gemini 3.6 Flash Is Now Default for Managed Agents
Google has updated Managed Agents in the Gemini API. The antigravity preview agent now runs Gemini 3.6 Flash by default, with no code changes required, and developers can explicitly select a model by passing agent_config.model, including Gemini 3.5 Flash for general agentic workflows and Gemini 3.5 Flash-Lite for the lowest latency and cost in the 3.5 family. The headline developer control feature is environment hooks: adding a .agents/hooks.json file to your environment lets custom scripts run before or after every tool call the agent makes inside its sandbox, on pre_tool_execution or post_tool_execution events, with a matcher field that supports regular expressions. If a pre-tool script returns a deny decision, the tool call is skipped and the rejection reason is passed into the model's context, which makes it possible to block, lint or audit tool calls. Hooks also support http handlers that POST to an external endpoint. Google says managed agents are now available on free tier projects, so developers can experiment with an API key from a project without active billing. New budget controls let you pass max_total_tokens inside agent_config to cap input, output and thinking tokens; when the cap is reached the run safely pauses and returns status incomplete with environment state preserved, so it can be continued with previous_interaction_id and a fresh budget. Scheduled triggers bind an agent, environment, prompt and cron schedule into a persistent resource, and each run reuses the same sandbox so files persist across executions. An Environments API lets you list, inspect and delete sandbox sessions from code rather than waiting for the 7 day TTL.
Transcript
Google just made Gemini three point six Flash the default for managed agents in the Gemini API.
Google says one API call coordinates reasoning, code execution, and web retrieval inside an isolated cloud sandbox. The antigravity preview agent now runs Gemini three point six Flash by default.
Environment hooks let you block, lint, or audit every tool call inside the sandbox. Google says a deny decision skips the call and passes your reason into the model's context.
Managed agents now work on free tier projects. A max total tokens cap pauses runs safely so you can resume, and cron triggers reuse the same sandbox on a schedule.
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Sources
Every claim in this video comes from the top ranking coverage of this topic. The claims and where each one came from:
- Managed Agents in the Gemini API now default to Gemini 3.6 Flash.(Google's official announcement)
- The antigravity-preview-05-2026 agent now runs Gemini 3.6 Flash by default, and no code changes are required.(Google's official announcement)
- With managed agents in the Gemini Interactions API, a single API call coordinates reasoning, code execution, package installation, file management, and web retrieval inside an isolated cloud sandbox.(Google's official announcement)
- Environment hooks let developers run custom scripts before or after every tool call the agent makes inside its sandbox, so tool calls can be blocked, linted, or audited.(Google's official announcement)
- If a pre-tool script returns a deny decision, the tool call is skipped and the rejection reason is passed into the model's context.(Google's official announcement)
- Managed agents are now available on free tier projects, so developers can use an API key from a project without active billing.(Google's official announcement)
- Passing max_total_tokens inside agent_config caps total consumption, and when the agent reaches the limit execution safely pauses with status incomplete and preserved environment state so it can be continued.(Google's official announcement)
- A trigger binds an agent, environment, prompt, and cron schedule into a persistent resource, and each run reuses the same sandbox so files persist across executions.(Google's official announcement)