go-steer/core-agent

core-agent

A reusable Go-based agent built on the Google Agent Development Kit.

📚 Full documentation: go-steer.github.io/core-agent

core-agent is the bottom layer for any project that needs a multi-turn LLM agent. It ships the wiring — model providers, MCP servers, skills loading, instruction loading, permission gating, telemetry, transcript persistence — so consuming projects can focus on their own tools and product logic.

Status: early. APIs may change. The headless CLI works; the library is in active use as the foundation for downstream projects in the go-steer org.

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Features

• Multi-turn conversation — backed by ADK's runner.Runner with an in-memory session service that automatically replays history across turns.
• Multiple model providers, picked by config or auto-detected from environment:
  • Gemini API via GOOGLE_API_KEY or GEMINI_API_KEY (either is accepted; GEMINI_API_KEY is the one Gemini's own docs and tutorials use). Gemini's built-in Google Search and URL Context tools are wired up by default; Code Execution is one option flip away.
  • Vertex AI (Gemini) via GOOGLE_GENAI_USE_VERTEXAI=true + ADC + GOOGLE_CLOUD_PROJECT — same built-in tools as Gemini API.
  • Anthropic / Claude via ANTHROPIC_API_KEY — implemented as a native ADK model.LLM adapter (ADK Go ships