ローカル AI エージェント用 Python フレームワーク 7 選

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# Introduction

An agent that calls a cloud API for every decision is renting its intelligence. It needs a key, it racks up a bill per token, and every request leaves your machine before you get an answer back. An agent built to run locally skips all of that. No API key, no per-call cost once the model is downloaded, and nothing leaves your network unless you tell it to. The catch is that running everything locally means you also need an orchestration layer that actually understands how to talk to a model sitting on your own hardware instead of one sitting behind someone else's API.

Below are seven Python tools that engineers are actually using in 2026 to build, coordinate, and run agents on local infrastructure, from the runtime that serves the model itself to the frameworks that decide what the agent does with it.

# 1. Ollama

Before you can orchestrate anything locally, something has to actually run the model. Ollama is a lightweight runtime for running open-source large language models (LLMs) on your own machine — the closest thing to Docker for language models. One command pulls a model, another serves it over a local API, with no Python environment to configure and no CUDA** drivers to install by hand.

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What makes Ollama the foundation almost every framework on this list builds on is one specific design choice. It exposes an OpenAI-compatible API, which means it slots directly into most agent frameworks without a custom adapter, alongside the privacy benefit of your data never leaving the machine and the cost benefit of every request being free once a model is downloaded. It isn't built for raw throughput, which is worth knowing before you scale past a single developer's laptop. For high-concurrency workloads, teams often pair Ollama's simplicity during development with something like vLLM**'s PagedAttention-based serving once they need more performance, while keeping the same agent orchestration layer on top.

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# 2. Smolagents

If you want to understand exactly what your agent is doing without digging through layers of abstraction, smolagents** from Hugging Face is built for that. The entire logic for agents fits in roughly 1,000 lines of code, with abstractions kept to their minimal shape above raw code, and the library is fully model-agnostic, supporting local transformers or Ollama models alongside dozens of hosted providers.

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Its defining feature is a different philosophy on how agents should act. smolagents gives first-class support to CodeAgents, which write their actions in code rather than being used after the fact to generate code, and it supports executing that code in sandboxed environments via Docker, E2B, or Modal** for safety. The honest tradeoff worth knowing: performance degrades sharply on smaller open-source models, with bugs creeping in consistently below the 7B parameter range, so this is a stronger fit when you're running a reasonably capable local model rather than a tiny one squeezed onto modest hardware.

# 3. PydanticAI

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Agents that call tools or hand off structured data are only as reliable as the format they output, and a model that occasionally returns malformed JSON can quietly break an entire pipeline. PydanticAI** was built by the team behind Pydantic specifically to close that gap. It leverages Python type hints to make every agent input, output, and tool call type-safe, with automatic schema validation and self-correction when an LLM's output doesn't match the expected structure.

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This makes it a particularly strong fit for local agents handling anything where data integrity actually matters. PydanticAI ensures data is structured, validated, and reliable, which is critical for compliance-heavy industries like finance and healthcare, and because it works with any OpenAI-compatible endpoint, pointing it at a local Ollama server is a straightforward swap rather than a separate integration. The project has been moving fast: active development pushed it to version 1.85.1 by April 2026, led by the Pydantic core team, with reviewers consistently citing its type safety and minimal dependencies as the standout feature.

# 4. CrewAI

For a single agent, the setup above this point is plenty. The moment you want several agents collaborating on different parts of a task, CrewAI** tends to be the framework people reach for first, specifically because of how quickly it gets you to something working. You define agents with roles and goals, group them into a crew, and let them collaborate — and it's arguably the easiest agent framework to get working with local models.

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The local-model story here isn't an afterthought either. CrewAI explicitly avoids dependencies on LangChain or other external agent frameworks, positioning itself as self-contained, and it supports OpenAI as the default model provider alongside explicit support for local runtimes via Ollama. It also supports the Model Context Protocol (MCP) across stdio, SSE, and streamable HTTP transports, so a local CrewAI setup can still reach out to standardized tool servers without losing the local-first model underneath it.

# 5. AgentScope

Where the previous frameworks optimize for getting started quickly, AgentScope** is built with production in mind from the start, and local deployment is treated as a first-class option rather than an edge case. AgentScope 2.0 is a production-ready agent framework with workspace and sandbox support, running tools and code in isolated environments with built-in backends for local execution, Docker, and E2B. With over 27,300 GitHub stars and two peer-reviewed papers backing its design, it's one of the more comprehensive options for teams building multi-agent systems that need to actually ship.

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The privacy angle is explicit rather than incidental. Agents run entirely in your own infrastructure, whether that's local servers or your own cloud, with no data sent to AgentScope's servers, and the model abstraction layer lets you swap in local or private models for sensitive workloads without rewriting your agent code. Multi-agent coordination is handled through what the framework calls a message hub. Agents communicate through structured message passing rather than shared implicit context, which keeps interactions transparent and auditable — a meaningful difference if you've ever had to debug a multi-agent system where it wasn't clear which agent influenced which decision.

# 6. LangGraph

LangGraph** has already come up in earlier coverage of agent orchestration, and for good reason: it's become the default choice for anything stateful, branching, or recoverable. The local-model angle is worth calling out specifically here. Because LangGraph works with any OpenAI-compatible backend, pointing a graph at a local Ollama instance for planning and tool decisions is a one-line swap, and the same checkpointing that makes LangGraph reliable in the cloud — pause-and-resume, time-travel debugging, and multi-instance scaling — works identically whether the model behind it is a frontier API or a model running on your own GPU.

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This matters most for local agents that need to do more than answer a single prompt. A reliable local agent loop benefits from a predictable structure, where the model proposes a plan, executes one tool action at a time, observes the result, and decides the next step, and once that loop needs to survive a crash or a long pause between steps, LangGraph's persistence layer is what keeps it from starting over from scratch every time.

# 7. Microsoft Agent Framework

If you need the governance and middleware features expected in a larger engineering organization, but still want the option to run everything on local infrastructure, Microsoft Agent Framework is worth knowing about. It's the unified successor to AutoGen and Semantic Kernel**, built by the same teams and announced in October 2025 as Microsoft's single orchestration SDK going forward, combining AutoGen's conversational multi-agent abstractions with Semantic Kernel's enterprise features like session-based state management, middleware, and telemetry.

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The detail that earns it a place on this specific list is direct, explicit local-model support — not something bolted on. The framework ships with a Python package and supports Microsoft Foundry, Azure OpenAI, OpenAI, Anthropic, Amazon Bedrock, Google Gemini**, and Ollama out of the box, which means a team standardizing on this framework for its enterprise features doesn't have to give up the option of running a fully local agent for sensitive workloads or offline development. Worth knowing before adopting it broadly: community-reported issues cluster around provider adapters outside the Azure OpenAI happy path, so teams running primarily on Ollama or non-Microsoft infrastructure should validate provider integration thoroughly before committing.

# Wrapping Up

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These seven tools aren't really competing for the same job. Ollama is the foundation that almost everything else sits on top of. smolagents and PydanticAI live a layer below full orchestration — one optimized for minimal abstraction and code-as-action, the other for type safety, where a malformed output simply isn't acceptable. CrewAI gets a local multi-agent prototype running the fastest. AgentScope and Microsoft Agent Framework bring production-grade structure, audit trails, and governance to local deployments. LangGraph sits in the middle, giving any of the above a durable, checkpointed backbone once a local agent needs to do more than respond once and stop.

The right pick depends less on which framework is "best" and more on which constraint you're actually solving for: speed of prototyping, strict data validation, production governance, or long-running state. Running locally doesn't mean settling for less capability anymore. It mostly means picking the framework built around the constraint that matters most to what you're shipping.

Shittu Olumide** is a software engineer and technical writer passionate about leveraging cutting-edge technologies to craft compelling narratives, with a keen eye for detail and a knack for simplifying complex concepts. You can also find Shittu on Twitter.