Who founded Executor?

Executor was founded by Rhys Sullivan in 2026.

Who are Executor's investors?

Executor's investors include Vela Partners, Y Combinator, OurCrowd, Peterson Venture Partners, Twenty Two Ventures.

Where is Executor headquartered?

Executor is headquartered in San Francisco, US.

Executor

YC S26

San Francisco, US · Founded 2026 · 1 employees · 5 known investors

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Executor is a tool that normalizes API integrations from different protocols (MCP, OpenAPI, GraphQL, or custom) into a single uniform tool shape, letting AI agents call any tool through one interface with a sandboxed TypeScript runtime. It targets developers and teams building agent-based applications, offering per-user credentials, call tracing, and safety guardrails for destructive actions, available as cloud, desktop, and CLI options.

Also known as Useful Software Company

AI & Machine Learning Data & Infrastructure Developer Tools Enterprise Software SaaS AIOps Artificial IntelligenceUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (S26)

Executor was founded in 2026 by Rhys Sullivan.

Rhys Sullivan FounderFounder of Executor, a tool that unifies API integrations across protocols so AI agents can call any tool through a single interface. He previously worked as a software engineer at Vercel, Microsoft, Raven Software, and Epic Games.

Investors · 5

Vela Partnerslisted by Vela PartnersSan Francisco · $100K – $500K

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

How we know: the Y Combinator directory · open dataset · 5k.vc investor directory · Not right? Tell us

OurCrowdreportedJerusalem

How we know: Y Combinator's founder network · Not right? Tell us

Peterson Venture PartnersreportedSalt Lake City · $5M – $25M

How we know: Y Combinator's founder network · Not right? Tell us

Twenty Two VenturesreportedPalo Alto · $50K – $250K

How we know: Y Combinator's founder network · Not right? Tell us

Related companies · 7

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MirrorsMirrors offers regression testing for AI agents by reconstructing the internal tools and APIs an agent uses from production traces, then replaying real sessions against each code change to flag differences in tool calls, arguments, and resulting state. It runs in CI on every pull request and targets teams whose agents perform irreversible actions such as issuing refunds, updating records, or sending outbound email.

OpenlayerOpenlayer provides a platform for testing, monitoring, and managing AI models across the development and production lifecycle. The platform serves AI-driven teams ranging from startups to enterprises seeking reliable and trustworthy AI system deployment.

ZensorsZensors builds multimodal "physical AI" that fuses data from sensors, cameras, and devices with text and warehouse metadata to understand physical spaces and activities, then uses AI agents to automate operational decisions. It targets enterprise operations, IT, and business teams looking to replace point solutions like LIDAR and beacons with a single AI system.

Companies working in the same space as Executor.

Legal entities · 1

corporate structure

Useful Software Company

In the news

Executor — One place to connect your agents to everythingycombinator.com · Aug 2026

Frequently asked questions

What does Executor do?: Executor is a tool that normalizes API integrations from different protocols (MCP, OpenAPI, GraphQL, or custom) into a single uniform tool shape, letting AI agents call any tool through one interface with a sandboxed TypeScript runtime. It targets developers and teams building agent-based applications, offering per-user credentials, call tracing, and safety guardrails for destructive actions, available as cloud, desktop, and CLI options.
Who founded Executor?: Executor was founded by Rhys Sullivan in 2026.
Who are Executor's investors?: Executor's investors include Vela Partners, Y Combinator, OurCrowd, Peterson Venture Partners, Twenty Two Ventures.
Where is Executor headquartered?: Executor is headquartered in San Francisco, US.