ag-ui-a2ui-toolkit
Framework-agnostic helpers for building A2UI subagent tools — op builders, prompt assembly, history walkers, and request/envelope orchestration shared across framework adapters.
Decision gist · record as of 2026-08-14
Yes, if you are building a framework adapter for A2UI subagent tools or integrating A2UI operations into an agent system. No, if you are looking for a direct end-user agent framework—this is a foundation library meant to be composed into adapters. Install it as a dependency of your framework adapter, not as a standalone tool.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later (supports up to <3.15)
- Low friction install with no runtime dependencies.
- Active maintenance status and recent releases (58 days since last release as of fact sheet date) suggest ongoing development.
License · maintenance · safety
MIT (permissive) — MIT license permits commercial and private use with minimal restrictions—typical permissive terms for open-source libraries.
last release 2026-06-17 (58 days)
0 known vulnerabilities (OSV.dev, 2026-08-14) · 667,073 downloads/mo, #5,422 on PyPI
Alternatives
Verify before relying
pip install ag-ui-a2ui-toolkit
from ag_ui_a2ui_toolkit import create_surface, build_subagent_prompt
surface = create_surface(...)
prompt = build_subagent_prompt(...)- Whether this package is intended for end-user installation or primarily as a dependency for framework adapters (LangGraph, ADK, Mastra, etc.)
- Whether the TypeScript counterpart's API parity claim extends to feature completeness or only surface naming
- Stability guarantees or semantic versioning policy given the 0.0.x version number
What it is and what it does
ag-ui-a2ui-toolkit is a Python library of reusable building blocks for constructing A2UI (agent-to-UI) subagent tools. It provides no framework dependencies itself—instead, it exports constants, operation builders (like create_surface and update_components), prompt composition helpers, state walkers, and orchestration functions that framework-specific adapters (for LangGraph, ADK, Mastra, and others) can wrap with their own decorators and runtime bindings.
The package is designed to be composed into framework adapters rather than used directly in application code. It handles the semantic and structural work of building A2UI requests, envelopes, and prompts, leaving framework integration to the adapter layer. With no runtime dependencies and active maintenance, it serves as a shared foundation for multiple agent frameworks to build A2UI tooling on top of.
Use it for
- Building a framework adapter (e.g., for LangGraph or ADK) that needs to compose A2UI operations with framework-specific tool decorators
- Assembling A2UI operation envelopes and structured prompts for subagent invocation without framework lock-in
- Managing A2UI state history and context across agent tool calls using the provided helpers
- Generating consistent A2UI tool definitions and schemas across multiple framework implementations
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are building a framework adapter for A2UI subagent tools or integrating A2UI operations into an agent system.
No, if you are looking for a direct end-user agent framework—this is a foundation library meant to be composed into adapters. Install it as a dependency of your framework adapter, not as a standalone tool.
Install
ag-ui-a2ui-toolkit on PyPI
Before you install
Low friction install with no runtime dependencies. Active maintenance status and recent releases (58 days since last release as of fact sheet date) suggest ongoing development.
Requires Python 3.10 or later (supports up to <3.15)
License in practice
MIT license permits commercial and private use with minimal restrictions—typical permissive terms for open-source libraries.
Quickstart
pip install ag-ui-a2ui-toolkit
from ag_ui_a2ui_toolkit import create_surface, build_subagent_prompt
surface = create_surface(...)
prompt = build_subagent_prompt(...)Verify before relying
- Whether this package is intended for end-user installation or primarily as a dependency for framework adapters (LangGraph, ADK, Mastra, etc.)
- Whether the TypeScript counterpart's API parity claim extends to feature completeness or only surface naming
- Stability guarantees or semantic versioning policy given the 0.0.x version number
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release <3.15,>=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 58 days since the last release |
| First released | |
| Downloads | 667,073 / month, #5,422 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
Evidence: ag_ui_a2ui_toolkit-0.0.4-py3-none-any.whl
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