The archive · Developer & Business Tools · Strategic decision · 2023–2026
Composio bets every AI agent needs a tool layer; $25M Series A, 49.5K-star repo
Composio gives AI agents 1,000+ pre-authenticated tools and auth, betting open source makes it the default connection layer for the agent boom.
Composio
What the business is
Open-source platform that gives AI agents 1,000+ pre-authenticated toolkits, per-user sessions, authentication and sandboxes so agents can act on apps instead of just answering.
Starting capital：$25M Series A led by Lightspeed Venture Partners (July 2025), with SV Angel and HubSpot founder Dharmesh Shah, bringing total funding to roughly $29M.
How it started
Founded 2023 in San Francisco by Soham Ganatra and Karan Vaidya, Composio started as the open-source glue between AI agents and the apps they needed to act on. The founding insight: an agent is only as useful as the tools it can call, and authentication is the part nobody wants to build.
What happened
By July 2025 the platform counted 200+ companies, including Glean, and announced a $25M Series A led by Lightspeed. Composio says agents can connect to more than 3,000 cloud apps and software tools, supports MCP, and ships a reinforcement-learning layer it claims lets agents improve and share what they learn.
How it ended up
Still scaling: as of September 2026 the SDK remains open-source and MIT-licensed, its awesome-claude-skills list grew 32.7x to 49.5K stars in Q1 2026, and adapters now cover OpenAI Agents, Claude, LangChain, CrewAI, Vercel AI SDK and more.
Background
Composio (Sampark Inc.) is an open-source platform that gives AI agents pre-authenticated toolkits — 1,000+ integrations, per-user sessions, authentication, triggers and sandboxes — so agents can take actions in real apps instead of just generating text. Its bet: every agent, from coding assistants to sales bots, needs a shared skill layer, and the startup that becomes the default connector wins the plumbing of the agent economy.
Founded in 2023 in San Francisco by Soham Ganatra and Karan Vaidya, Composio rode the MCP (Model Context Protocol) wave and the agent-tooling boom. By July 2025 the platform counted more than 200 companies, including Glean, and announced a $25M Series A led by Lightspeed Venture Partners — with SV Angel and HubSpot founder Dharmesh Shah joining — bringing total funding to roughly $29M.
The company's open-source distribution engine worked: its curated awesome-claude-skills collection grew 32.7x to 49.5K GitHub stars in Q1 2026 (Runa Capital ROSS Index), and the SDK ships adapters for OpenAI Agents, Claude, LangChain, CrewAI, Vercel AI SDK and more. Composio says a reinforcement-learning layer lets agents share what they learn, turning tool calls into an accumulating skill base.
As of September 2026 Composio remains independent and scaling, keeping the SDK MIT-licensed while selling the hosted platform — the open-core bet that developer adoption, not a sales motion, is the moat.
What has to be true
- Agents are only as valuable as the tools they can call, and auth is the part every team wants to outsource — Composio made that its wedge.
- MIT-licensed SDK plus viral curated lists put Composio inside developer workflows before it had a sales team, the same playbook as other open-source infrastructure winners.
- Riding the MCP standard let Composio plug into Claude, Cursor, OpenAI Agents and every emerging harness without being locked to one model vendor.
- The agents-learn-from-each-other narrative gave investors a scaling story beyond API reselling, supporting a $29M total raise.
What can be applied
Open-source distribution can win infrastructure layers: a free SDK and curated list put Composio inside developers' workflows before any sales team, so the paid platform rides on free adoption.
Aftermath
As of September 2026 Composio is live and scaling: the MIT-licensed SDK remains on GitHub with 1,000+ toolkits, adapters for the major agent frameworks, and a hosted platform sold to enterprise customers. Its awesome-claude-skills list is one of the fastest-growing agent-curated repos on GitHub (49.5K stars by end of Q1 2026), and the company continues to position itself as the skill layer for AI agents — infrastructure for authentication, tool execution and cross-agent learning — rather than as a model or an app.
Sources
- Composio raises $25M in funding to ease AI agent development
- We raised $29M to build skills that evolve with your agents
- Top trending open-source startups in Q1 2026
- ComposioHQ/composio
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