CrewAI is a framework for designing and orchestrating multi-agent AI systems, providing built-in guardrails, memory, and observability. It supports structured agent outputs, long-running workflow persistence, and various process types including human-in-the-loop. Enterprise features facilitate deployment, integration with external services, and team management.

Mastra is a TypeScript framework for building and shipping AI agents, focusing on rapid prototyping and production readiness. It provides a structured approach for defining agents, tools, and integrating with various LLM providers through a unified model router. The framework includes a Studio UI for managing development workflows and supports integration into existing web frameworks.

• +Built-in guardrails, memory, knowledge, and observability for multi-agent systems.
• +Supports structured agent outputs using Pydantic.
• +Enables orchestration of long-running, stateful workflows with persistence and resumption.
• +Allows defining diverse process types: sequential, hierarchical, hybrid, with human-in-the-loop triggers.
• +Provides enterprise features for deployment, environment management, and live run monitoring.
• +Offers extensive integrations with external services like Gmail, Slack, Salesforce, and Bedrock Agents.
• +Includes team management capabilities with Role-Based Access Control (RBAC) for production automations.

• +Provides a structured TypeScript framework for building AI agents, enabling fast prototyping and reliable deployment.
• +Offers an integrated model router that abstracts LLM providers (OpenAI, Anthropic, Google, xAI) using a `provider/model` string format and environment variables.
• +Enforces a clear structure for defining tools via `createTool()` including Zod schemas for input/output, preventing silent execution failures.
• +Includes Mastra Studio, an interactive UI for building, testing, and managing agents, workflows, and tools.
• +Supports integration with popular web frameworks like Next.js, React, Astro, Express, SvelteKit, and Hono.
• +Enables a wide range of use cases, including customer-facing assistants, internal copilots, data analysis, content automation, and DevOps.
• +Provides access to a large selection of models through its model router, beyond a short list of known IDs.

• −Plain object tool definitions silently fail to execute; tools must be strictly defined via `createTool()` with specific properties.
• −Requires a `package.json` file with `"type": "module"` for project setup.
• −Requires Node.js 22.18.0 or later for direct TypeScript file execution.

The framework manages state within flows, allowing for persistence and resuming long-running workflows.

Mastra manages state through explicitly defined Agent and Tool objects, configured within a central Mastra instance, which then handles model routing and execution context via environment variables.