Portia AI: Build Agents That are Predictable, Controllable and Authenticated

Portia AI, a London-based startup, is revolutionizing the world of AI agents with its open-source SDK. Co-founded by Emma Burrows and Mounir Mouawad, both of whom have extensive experience at tech giants like Stripe and Google, Portia AI aims to enable developers to build AI agents that are not only intelligent but also predictable, controllable, and secure. The company emerged from stealth in March 2025, and its rapid growth was bolstered by a €5.1 million funding round, led by General Catalyst, with support from First Minute Capital and Stem AI. With its innovative solutions, Portia AI is making it easier for developers to deploy production-grade AI agents that integrate seamlessly with existing systems and applications.

Idea and Product

Portia AI’s core product is an open-source software development kit (SDK) designed to help developers create reliable AI agents. The SDK is built around three key pillars: predictability, controllability, and authentication. Developers can use the Portia SDK to generate structured multi-agent plans, manage execution states, and securely authenticate users for seamless interaction with external tools and applications. The SDK’s tools allow AI agents to share explicit plans, pause for human input when necessary, and ensure that agents’ behavior remains visible and manageable throughout their lifecycle. Additionally, Portia offers cloud-based features that simplify the deployment of these agents at scale, enhancing their usability in real-world production environments.

Market

The market for AI agents is rapidly growing, with businesses across various industries recognizing their potential to automate tasks and enhance decision-making. Portia AI is particularly well-positioned to target industries that require strict compliance and trust, such as Financial Services, where transparency, auditability, and secure authentication are paramount. The platform addresses a significant gap in the market, as many pilot AI projects struggle to transition into production due to the lack of control and visibility over agent behavior. Portia AI’s solution caters to developers who need reliable, transparent, and controllable AI agents that can work alongside human input and meet regulatory requirements, making it a valuable tool for businesses operating in highly regulated environments.

Business Model

Portia AI operates a hybrid business model, combining an open-source SDK with a cloud-based offering that provides additional tools and features for scaling AI agent deployments. The open-source nature of the SDK ensures that developers can experiment with and integrate the technology freely, while the cloud-based services provide premium tools for managing agents at scale, including runtime authentication and agent execution management. This dual approach allows Portia to attract a broad base of developers, while also offering paid services for enterprises that require more robust features and enhanced security. By providing both free and premium options, Portia AI is able to foster a developer community while monetizing its more advanced cloud-based solutions.

Technology

Portia AI’s technology is built to ensure that AI agents are predictable, controllable, and authenticated throughout their lifecycle. The platform integrates large language models (LLMs) with a planning agent that can generate multi-agent plans dynamically, allowing developers to specify agent behavior before execution begins. This approach minimizes risks associated with AI’s autonomous decision-making and ensures that the agents’ actions are traceable and understandable. Furthermore, Portia AI’s SDK supports a variety of popular AI models, including OpenAI, Anthropic, Mistral, and more, and offers the flexibility to integrate custom LLM instances into its platform. The cloud component enhances the SDK by providing tools for secure authentication, runtime management, and seamless collaboration between agents and users.

Vision and Ambition

Portia AI envisions a future where AI agents are seamlessly integrated into business operations, acting as reliable, transparent, and collaborative partners. The company’s ambition is to democratize the deployment of production-grade AI agents by making it easier for developers to build and control these agents with minimal friction. By focusing on predictability, controllability, and authentication, Portia aims to be at the forefront of AI automation, offering businesses the tools to build trustworthy and compliant solutions. The company’s long-term goal is to reshape how organizations leverage AI by providing a platform that enables responsible, secure, and scalable agent deployments across industries.

Team

Portia AI’s founding team is led by Emma Burrows and Mounir Mouawad, two seasoned entrepreneurs with deep expertise in AI, product development, and technology leadership. Emma Burrows, Portia AI’s CTO, previously served as the CTO of Stripe UK and built the company’s engineering team from the ground up. Mounir Mouawad, the CEO, led product expansions at Stripe and was instrumental in launching Google Pay across multiple markets. The duo’s combined experience in building successful, scalable tech products at companies like Google, Stripe, and Amazon has provided them with the insights needed to tackle the complexities of AI agent development. The company has also attracted a talented group of engineers and developers who are instrumental in driving the platform’s growth and innovation.

Investors and Funding

Portia AI secured €5.1 million in its latest funding round, which was led by General Catalyst, with additional support from First Minute Capital and Stem AI. The company also gained backing from a select group of angel investors who share its vision for the future of AI agents. This funding round will help Portia expand its developer team, enhance its product offerings, and accelerate its go-to-market strategy. Investors are enthusiastic about the potential of Portia AI, particularly due to the founding team’s expertise and their clear vision for creating AI agents that are both intelligent and manageable. The company’s strong investor backing positions it well for future growth in a rapidly evolving market.

Achievements and Milestones

Portia AI has made significant strides since its inception, emerging from stealth in March 2025 and immediately starting to collaborate with design partners to refine its product. The company’s open-source SDK has attracted a growing developer community, and its cloud tools have made it easier for businesses to deploy and scale AI agents. Notable milestones include the release of the Planning agent, which enables developers to pre-express and iterate on agent behavior before execution, as well as the introduction of secure runtime authentication for tools. The company’s product has been tested with real-world use cases, and the positive feedback from early adopters has confirmed the value of Portia’s approach to building transparent, controllable, and predictable AI agents.

Challenges and Risks

Despite its promising start, Portia AI faces several challenges in its journey to scale its business. One of the key risks is the competition in the rapidly evolving AI space, where numerous startups and established companies are vying for attention with their own AI agent solutions. Additionally, building trust in AI agents is no small feat, particularly in industries like finance where security and compliance are non-negotiable. Portia must ensure that its platform continues to meet these stringent requirements while scaling its product offerings to accommodate diverse use cases. Furthermore, the success of the company will depend on its ability to attract and retain top talent in a highly competitive market, as well as its ability to continue innovating and expanding its feature set to meet the growing demands of the AI market.

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Sources:
Portialabs.ai
British startup Portia AI bags €5 million to help developers build AI agents in production with better human oversight

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