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Gave a talk at #GDG Cloud Paris about the #antigravity SDK for #Java! While the official SDK is in Python, I built an unofficial Java SDK to bring agent automations to the JVM. Article & 8 code samples 🧵👇 glaforge.dev/talks/2026/...

Guillaume Laforge

@glaforge.dev

Antigravity powers agents across the CLI, IDE, and desktop manager. The Java SDK wraps the native Go execution harness with a fluent, type-safe API for #Gemini models. Browse the 20-slide deck here: speakerdeck.com/glaforge/an...

speakerdeck.comAntigravity SDK for the Java DeveloperAntigravity is a family of agentic tools, comprising Antigravity 2.0 (the agent manager desktop application), Antigravity CLI (to work in the terminal),…

Guillaume Laforge

@glaforge.dev

1️⃣ Local Java Tools & Structured Output Annotate Java methods with @Tool and @Param to let the agent call your code. With .finishToolSchema(Record.class), the SDK derives the JSON Schema and deserializes the response directly into your Java record. Zero manual parsing.

23/9/26, 2:56 pm0 reposts0 likes

Guillaume Laforge

@glaforge.dev

2️⃣ Real-time Streaming & Thinking Modern Gemini models think before answering. With chatStream(), you stream tokens as they arrive while separating the model's internal chain-of-thought (thoughtsDelta) from the final response text (textDelta). Great for transparent UIs.

Guillaume Laforge

@glaforge.dev

3️⃣ Deny-by-default Security Policies Autonomous agents shouldn't have unrestricted privileges. Configure guardrails with Policies.denyIf(...) to intercept and block destructive operations before execution, allow safe read tools, and fall back to denyAll().

Guillaume Laforge

@glaforge.dev

4️⃣ Open Agent Skills & Session State Load folder-based skills (SKILL.md) for progressive disclosure: keep prompts lean until specialized knowledge is needed. Plus, inject ToolContext into tool methods to store session-scoped state without polluting LLM schemas.

agentskills.ioAgent Skills Overview - Agent SkillsA standardized way to give AI agents new capabilities and expertise.

Guillaume Laforge

@glaforge.dev

5️⃣ GitHub PR Review Agent (Main Demo) Combines custom GitHub tools, review rubrics via Agent Skills, subagents, and lifecycle hooks to compare two competing PRs in LangChain4j, stream thoughts live, and produce an objective review report.