Guide, updated Oct 16, 2026
Best tool integration platforms for AI agents
Prebuilt tool calls and managed OAuth for thousands of apps. We list 5 integration and tool-calling platforms. Summaries come from each vendor's own site and every link was checked on or before Oct 16, 2026.
Shortlist
All 5 at a glance
Alphabetical. Nothing in this guide is a paid placement.
| Tool | What it does | Open source | More |
|---|---|---|---|
| Arcade | Actions runtime that lets agents act on users' behalf with governed auth. | No | Alternatives |
| Composio | Tool calls with delegated auth across 1,500+ apps for agents. | No | Alternatives |
| Nango | Integration platform connecting products and agents to 1,000+ APIs. | No | Alternatives |
| Pipedream Connect | Managed auth and thousands of prebuilt tools across 3,000+ APIs. | No | Alternatives |
| Smithery | Registry and hosting to connect agents to MCP tools and services. | No | Alternatives |
How to choose
What to check before you pick
- Auth: managed OAuth so the agent can act on a user's behalf without you storing tokens.
- Catalog: which apps and APIs are covered out of the box.
- Protocol: native tool calls, MCP servers, or both.
- Governance: permissions, audit logs and approval steps for sensitive actions.
- Hosting and pricing: managed, self-hosted, per call or per connected account.
This checklist is general advice. Check each vendor's docs and pricing page for current details.
The tools
Each option in one paragraph
Arcade
arcade.devActions runtime that lets agents act on users' behalf with governed auth.
In their words: “Arcade: The Actions Runtime for Enterprise AI Agents”
Composio
composio.devTool calls with delegated auth across 1,500+ apps for agents.
In their words: “Composio”
Nango
nango.devIntegration platform connecting products and agents to 1,000+ APIs.
In their words: “Nango | Build integrations with AI”
Pipedream Connect
pipedream.comManaged auth and thousands of prebuilt tools across 3,000+ APIs.
In their words: “Pipedream, The integration layer for AI agents”
Smithery
smithery.aiRegistry and hosting to connect agents to MCP tools and services.
In their words: “Smithery - Connect agents to services in minutes”
Head to head
Compare them side by side
FAQ
Questions
Which integration and tool-calling platforms does Agent Stack Directory list?
5: Arcade, Composio, Nango, Pipedream Connect, Smithery.
Which of them are open source?
None of them is marked open source in our data.
How is this list ordered?
Alphabetically. No placement in this guide is paid. Sponsored and featured tools are labeled elsewhere on the site and never reordered here.
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