STACK vs. Composio

Composio is an integration shelf. STACK is a control plane. They sit at different layers of an agent stack and they answer different questions. This page is the version of that comparison that doesn't pretend they're competing for the same job.

An integration shelf, not a control plane

Composio (composio.dev) sells you breadth. The homepage advertises more than 1,000 apps an agent can hit through their SDK. Each integration ships a managed OAuth flow, an encrypted vault for the resulting tokens, and a centralized log of every tool call. The wedge is time-to-integration: connect an agent to Slack, Salesforce, GitHub, Notion, and forty other things in an afternoon, instead of writing forty bespoke OAuth flows yourself. Their bet is that integration breadth is what determines whether an agent project ships at all, and they raised against that bet.

The credential layer they ship alongside (managed OAuth, encrypted vault, centralized tool-call log) is a competent feature inside that integration framework. It wasn't built to be a security control plane and the architecture reflects that. There's no hash-chain on the audit, no runtime detector layer, no global revocation cascade across delegated children, no EU AI Act mapping. None of those were the wedge they raised on, and the team would probably agree they're not trying to be those things.

Where control-plane work starts

STACK is what you reach for when “the agent called something it shouldn't have” becomes a question someone is asking out loud. The five layers exist to answer it concretely:

• Credentials don't live in the agent process. The proxy injects them at the call boundary.
• Every outbound call is re-checked against intent and scope, and 23 named detectors fire on each call (prompt-injection, output exfiltration, scope drift, behavioral anomaly, and more, with a public benchmark and regression CI).
• Every action lands in a hash-chained per-tenant audit log that's externally verifiable; tampering is detectable structurally.
• One revocation cascades through passport, proxy, audit, and delegated children in under sixty seconds.
• EU AI Act Article 14 mapped clause-by-clause publicly.

Composio's integration catalog sits one layer up from the question STACK is built to answer. None of the five layers above is enterprise-only equipment. Credentials belong out of the agent process at every scale, and audit plus revocation matter the moment an agent leaves a sandbox.

The honest read: pick by which side hurts more right now. If integration breadth is your blocker, Composio. If runtime control is your blocker, STACK.

Last reviewed 2026-05-09. Composio claims sourced from composio.dev homepage and product documentation.