Changelog

Track the evolution of the Hikigai SDK. New features, improvements, and fixes.

v2.1.0

BREAKINGJanuary 2026

Multi-Agent Systems & Project Association

Multi-agent systems with sequential, parallel, and loop execution
Session-based conversation management
Project-scoped deployments (breaking change)
Tools now optional for simple LLM agents

Added

•Multi-agent support: agent_type with sequential, parallel, and loop modes
•Sub-agents deployment with sub_agents field for complex workflows
•Session management with session_id parameter and with_session() method
•Planning & reasoning modes (planning_mode: builtin or plan_react)
•Code execution support (code_execution with gemini, vertex_sandbox, or local executor)
•Advanced LLM control (temperature, top_p, top_k, max_output_tokens)
•Project-scoped API keys and agent deployment with project_id
•max_iterations parameter for loop agents
•thinking_budget for planning mode token allocation
•include_thoughts flag to expose reasoning in responses

Changed

•BREAKING: project_id is now REQUIRED in AgentConfig
•BREAKING: display_name is now REQUIRED (no longer optional)
•BREAKING: version is now REQUIRED (no default value)
•BREAKING: timeout is now REQUIRED (no default value)
•Tools are now OPTIONAL - empty list allowed for simple LLM agents
•SDK always sends tools, memory_mb, timeout fields regardless of values
•Backend validates project_id matches API key scope

Improved

•Better validation error messages with detailed field information
•Frontend deployment wizard allows agents without tools
•SDK payload construction optimized for required backend fields
•Documentation updated with comprehensive multi-agent examples

v0.3.0

NEWDecember 2024

Schema Types & ADK Support

Typed input/output schemas for agents
Google ADK agent deployment support
Enhanced HIPAA compliance configuration

Added

•InputSchema and OutputSchema classes for typed agent I/O
•Field types: StringField, NumberField, IntegerField, BooleanField, ArrayField, ObjectField, EnumField
•deploy_adk() and deploy_adk_project() methods for Google ADK agents
•HIPAAConfig class for compliance settings
•AgentVersion class for version metadata
•Session-based conversations with with_session()

Improved

•AgentConfig now supports schemas, versioning, and display names
•Agent model includes tools, runtime config, and compliance flags
•Performance optimization with __slots__ across all types
•Lazy loading for constants (CATEGORIES, MODELS, TAGS)

v0.2.0

NEWNovember 2024

Async Client & Streaming

Full async/await API with HikigaiAsync
Auto-pagination for listing agents
Real-time streaming responses

Added

•HikigaiAsync class for async operations
•AsyncAgent wrapper for async invoke/stream
•AgentPaginator with auto-pagination (iter_agents)
•Streaming support via agent.stream()
•deploy_from_file() for code-based deployment

Improved

•Connection pooling for better performance
•Agent caching to reduce API calls
•InvokeResponse now includes latency_ms and tokens_used

Fixed

•Rate limit retry handling with exponential backoff
•Session ID persistence across invocations

v0.1.0

October 2024

Initial Release

Core SDK for deploying AI agents
HIPAA-compliant infrastructure
CLI tools for development

Added

•Hikigai client class with deploy, agent, list_agents, delete_agent
•AgentConfig for deployment configuration
•Agent class with invoke() method
•ToolConfig for agent tools
•Exception hierarchy (HikigaiError, AuthenticationError, etc.)
•CLI tool with deploy, list, get, invoke, delete commands
•Logging utilities with set_log_level()
•UsageResponse for API usage statistics

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