Is Harbor an open-source alternative to Composio?

Not in the strict sense. The Harbor SDK is public on GitHub at github.com/zonko-ai/harbor-sdk, but the control plane source is not. Composio has a public GitHub presence at github.com/ComposioHQ; refer to its repositories for current license terms.

Does Harbor have as many connectors as Composio today?

Harbor's registry catalogue exposes 149 registry entries covering 135 unique provider families (derived from packages/sdk/registry-catalog/data/v1/catalog.json). Composio publishes its own connector catalogue on composio.dev; record the live count at edit time before comparing. If your decision is "which platform gives me a connector for X this week", check Composio's catalogue first.

How does Harbor handle OAuth differently from Composio?

Harbor binds every OAuth connection to a workspace, not a user profile, and asks you to authorize each tool — or pattern of tools — beyond the provider consent screen. Grants are revocable per-tool from the dashboard and take effect for subsequent calls. Composio's OAuth model is documented at connected-account granularity; if per-tool revocation inside a single connected account is important, verify Composio's current behaviour against docs.composio.dev.

Where do runs and traces live in Harbor vs Composio?

In Harbor, exec requests create run and span records for tool calls, sandbox stdout/stderr, plugin dispatch, and orbit access where applicable; that history is queryable and persisted to D1. Whether Composio exposes an equivalent first-class run / trace product surface is not stated on the public composio.dev pages and should be verified on docs.composio.dev.

Can Harbor consume MCP servers from Composio?

Yes. Harbor explicitly supports consuming third-party MCP servers as plugins. A Composio-managed connector exposed over MCP can be installed into a Harbor workspace and invoked through `hrbr exec` like any other plugin tool.

Harbor

Harbor vs Composio

Updated May 26, 2026

Composio and Harbor are direct competitors when the problem is letting agents use and compose connected tools. Composio is positioned as an integration platform first — its strongest content is a JTBD use-case catalogue that maps named SaaS to quantified outcomes, and it publishes formal attestations on a dedicated trust subdomain. Harbor is positioned as an all-in-one agent execution layer: every plugin call, OAuth grant, typed `hrbr exec` run, state write, artifact, job, app, workflow, and trace is bounded by a workspace. Pick by whether your team needs pre-built connector breadth or workspace-tenanted execution this quarter.

Pick Harbor if: you want agents to compose connected tools and workspace state inside traced runs, not just receive a connector catalogue.
Pick Composio if: broad pre-built connector coverage and ready-made use-case templates matter more right now than workspace tenancy or a typed exec runtime.

Harbor vs Composio: the honest take

Composio is an integration platform for AI agents. Its public surface is anchored on a large catalogue of toolkits — each one a per-provider MCP integration that lets clients like Claude, ChatGPT, and Cursor reach a SaaS API through a managed MCP server. A dedicated agent-native signup at agents.composio.dev sits alongside the developer signup on composio.dev, and a trust subdomain plus public pricing page back the procurement story.

Where Harbor is the better fit

Harbor leads when the hard part is not just reaching tools, but turning tool access into an auditable workspace run. Plugin connections, OAuth state, runs, traces, artifacts, jobs, apps, and workflow state are scoped to a workspace rather than to a single end-user profile. Harbor also puts `hrbr exec` behind a Cloudflare codemode Worker isolate with provider calls mediated host-side. The Cloudflare-native substrate (Workers + D1 + KV + R2 + Vectorize + Workflows + Durable Objects) is part of the product, not an implementation detail.

Where Composio is the better fit

Composio leads when the deciding factor is pre-built toolkit breadth or formally published security attestations. If a stock Composio toolkit covers the SaaS you need and you want a per-provider MCP server you can drop into Claude, ChatGPT, or Cursor without wrapping it yourself, a connected account is a fast path to a working agent. The trust subdomain backs B2B procurement cycles where listed attestations are a hard requirement.

Side-by-side

Where a winner is indicated, it reflects Harbor's view of which fit is better for an AI-agent control-plane use case. Where neither cell has a marker, the choice depends on context.

Comparison of Harbor and Composio on workspace-scoped MCP control plane attributes.
Attribute	Harbor	Composio
Workspace tenancyHarbor: apps/api schema (workspaces, plugins, runs). Composio: composio.dev	Harbor's pick: Harbor.Workspace is the top-level isolation primitiveevery plugin connection, OAuth grant, run, and trace is bound to a workspace_id; multiple agents can share the workspace credentials	Not publicly disclosedcomposio.dev frames the surface around connected accounts and use-cases; the multi-user shared-tenancy model is not stated as a documented primitive
MCP server hosting modelHarbor: CLAUDE.md "MCP Mental Model" + mcp.tryharbor.ai/mcp. Composio: docs.composio.dev	Harbor's pick: Harbor.Consumes third-party MCP servers; exposes a protected Harbor MCP endpointHarbor installs third-party MCP servers as plugins; mcp.tryharbor.ai/mcp advertises protected-resource metadata for first-party Harbor access	Exposes MCP-compatible surfaces for its connectorsComposio publishes MCP-style endpoints for its catalogue; confirm the current set on docs.composio.dev
Integration / plugin countHarbor: registry catalog (build-time). Composio: composio.dev	149 registry entries / 135 unique provider familiesderived at build time from packages/sdk/registry-catalog/data/v1/catalog.json	Harbor's pick: competitor.Cite live count at composio.devComposio publishes a public connector catalogue on composio.dev; record the live count and date at edit time rather than asserting a stale number
Deployment modelHarbor: apps/api Cloudflare Workers deploy. Composio: composio.dev/pricing	Harbor's pick: tie.Hosted onlymanaged tryharbor.ai; first-party self-host is on the Enterprise roadmap	Harbor's pick: tie.Hosted SaaScomposio.dev is a managed cloud product; confirm any self-host offering on the current pricing page
Runtime substrateHarbor: apps/api/wrangler.jsonc. Composio: composio.dev	Cloudflare Workers + D1 + KV + R2 + Vectorize + Workflows + Durable Objectsapps/api on Workers; runs persisted to D1; credential state is KV-backed; artifacts in R2	Not publicly disclosedComposio runs a managed cloud product; the underlying substrate is not stated on composio.dev
OAuth modelHarbor: apps/api/src/plugins/oauth/. Composio: docs.composio.dev	Harbor's pick: Harbor.Workspace-scoped authorization above provider consentprovider OAuth state is scoped to the workspace; route and policy checks constrain which actions execution can take	Not publicly disclosed at per-tool granularityComposio docs describe auth at the connected-account level; finer per-tool revocation semantics need confirmation on docs.composio.dev
OSS licenseHarbor: github.com/zonko-ai. Composio: github.com/ComposioHQ	SDK public on github.com/zonko-ai/harbor-sdkcontrol plane closed source; SDK repo present on the zonko-ai org	Public GitHub presence at github.com/ComposioHQverify the current SPDX identifier on the active Composio repos before relying on a specific OSS classification
Pricing modelHarbor: tryharbor.ai/. Composio: composio.dev/pricing	Harbor's pick: tie.Free + Workspace + Enterprise tiersWorkspace tier usage-based units not yet priced publicly	Harbor's pick: tie.Public pricing page at composio.dev/pricingrecord the live plan names and units at edit time
Observability surfaceHarbor: apps/api/src/plugins/worker/. Composio: docs.composio.dev	Harbor's pick: Harbor.Runs + spans + workspace-scoped execution history, persisted to D1exec requests create run and span records for tool calls, sandbox output, plugin dispatch, and orbit access where applicable	Not publicly disclosed as a first-class product objectverify whether Composio publishes a run / trace product surface on docs.composio.dev before treating the comparison as binding
Identity & inbound authHarbor: WorkOS dashboard + apps/api auth routes. Composio: trust.composio.dev	WorkOS / AuthKit for web sign-in; protected-resource metadata for Harbor MCPSAML / OIDC / SCIM available via WorkOS on Enterprise	Not publicly disclosed in fullComposio publishes a trust subdomain at trust.composio.dev; confirm the currently listed IdP, SAML / SCIM tier, and active attestations there before quoting them
Sandbox / execution isolationHarbor: apps/api/src/plugins/worker/. Composio: docs.composio.dev	Harbor's pick: Harbor.Cloudflare codemode Worker isolate, separate from the Harbor API Workerprovider tokens are never exposed to executing code; credentials are dispatched host-side	Not publicly disclosedComposio executes connector calls server-side; the exact isolation boundary and credential-exposure model are not stated on composio.dev
Durable workflow supportHarbor: harbor-workflows skill + apps/api worker. Composio: docs.composio.dev	Harbor's pick: Harbor.step.* references can route hrbr exec through Cloudflare Workflowsthe API has workflow-mode routing for step.do / step.sleep / step.waitForEvent; treat exact product limits as implementation-specific	Not publicly disclosedverify durable-execution primitives (retries with backoff, sleep, external-event resume) on docs.composio.dev
Public docsHarbor: docs.tryharbor.ai. Composio: docs.composio.dev	Harbor's pick: tie.docs.tryharbor.ai with concept docs, guides, recipes; llms.txt publishedllms.txt is live; additional LLM-oriented docs should be verified when shipped	Harbor's pick: tie.docs.composio.dev with SDK references and use-case guidesrecord llms.txt presence at edit time

Source · Harbor cells grounded in this repository (routes, schemas, registry catalog, and runtime bindings). Composiocells grounded in the competitor's own public site and docs at composio.dev. Cells we could not verify from a primary source are marked “Not publicly disclosed” rather than guessed.

What does Composio do?

Composio is positioned as an integration platform aimed at agent builders. Its product surface centres on a catalogue of pre-built connectors to SaaS apps and a set of JTBD-shaped use-case pages that pair each integration with a quantified outcome — e.g. "close 9 calls in 14 days", "reconcile $50 variance". The strongest part of Composio's public surface is the use-case index, which stacks named SaaS (Salesforce, HubSpot, Stripe, Linear) with explicit business framings.

Composio also publishes a trust subdomain at trust.composio.dev and a public pricing page at composio.dev/pricing. Its GitHub presence is at github.com/ComposioHQ. Specific license terms, current plan names, and the active set of attestations should be confirmed against those pages at edit time rather than asserted from memory.

How does Harbor differ?

Harbor is positioned as an all-in-one agent execution layer, not as a catalogue of pre-built connectors. The Harbor mental model is Plugin → Tool → Run → Trace: plugin connections and OAuth state are workspace-scoped, and exec-style work is recorded as runs with spans for tool calls, runtime output, plugin dispatch, and orbit access where applicable.

The execution layer is server-side TypeScript in a Cloudflare codemode Worker isolate, separate from the Harbor API Worker, with `orbit.*` runtime primitives (`hrbr.storage`, `hrbr.cache`, `hrbr.db`, `hrbr.ai`, `hrbr.tools`, `hrbr.jobs`) in scope. Harbor also exposes protected MCP metadata at mcp.tryharbor.ai/mcp for first-party access. The split — typed code over chained tool calls — is the primary structural difference from a connector-catalogue model.

When should I pick Harbor over Composio?

Pick Harbor when workspace tenancy, workspace-scoped tool access, and traced exec are load-bearing for you — for example, a team that needs the same Linear / GitHub / Slack credentials to be available to multiple agents inside one workspace, with policy checks around subsequent calls. Pick Harbor when you want the agent to write typed code that composes tools, state, artifacts, jobs, apps, workflows, and traces rather than chain individual tool calls through the model context.

Pick Harbor when Cloudflare-native operational characteristics matter to you: Workers, D1, KV, R2, Vectorize, and Workflows handle the runtime; credential state is KV-backed; runs persist to D1; step-based long-running pipelines can use the Workflows lane.

When should I pick Composio over Harbor?

Pick Composio when broad pre-built connector coverage is the deciding factor and you do not need a workspace-scoped runtime today. If your team's integration shape maps directly onto a Composio JTBD template, that template plus a connected account is a fast path to a working agent.

Pick Composio when its published trust posture (visible at trust.composio.dev) is a procurement requirement and you need the attestations currently listed there today. Harbor's security model includes workspace isolation, Cloudflare-native credential storage, and protected metadata for inbound MCP, but the equivalent formal attestations on a dedicated trust page are not yet published on tryharbor.ai.

Can I use both?

Yes. Harbor can consume third-party MCP servers as plugins. If your team already has Composio-managed integrations exposed over MCP, you can connect them to a Harbor workspace and call the same connectors through `hrbr exec` while keeping Harbor's workspace tenancy and run / trace history around the calls. The reverse direction depends on Composio-side client support for Harbor's protected MCP endpoint and should be verified for the specific flow.

The practical pattern is: keep Composio where it gives you the fastest path to a working JTBD template, keep Harbor where workspace tenancy and traced exec are load-bearing, and let them meet at the MCP protocol boundary.

Frequently asked

Is Harbor an open-source alternative to Composio?: Not in the strict sense. The Harbor SDK is public on GitHub at github.com/zonko-ai/harbor-sdk, but the control plane source is not. Composio has a public GitHub presence at github.com/ComposioHQ; refer to its repositories for current license terms.
Does Harbor have as many connectors as Composio today?: Harbor's registry catalogue exposes 149 registry entries covering 135 unique provider families (derived from packages/sdk/registry-catalog/data/v1/catalog.json). Composio publishes its own connector catalogue on composio.dev; record the live count at edit time before comparing. If your decision is "which platform gives me a connector for X this week", check Composio's catalogue first.
How does Harbor handle OAuth differently from Composio?: Harbor binds every OAuth connection to a workspace, not a user profile, and asks you to authorize each tool — or pattern of tools — beyond the provider consent screen. Grants are revocable per-tool from the dashboard and take effect for subsequent calls. Composio's OAuth model is documented at connected-account granularity; if per-tool revocation inside a single connected account is important, verify Composio's current behaviour against docs.composio.dev.
Where do runs and traces live in Harbor vs Composio?: In Harbor, exec requests create run and span records for tool calls, sandbox stdout/stderr, plugin dispatch, and orbit access where applicable; that history is queryable and persisted to D1. Whether Composio exposes an equivalent first-class run / trace product surface is not stated on the public composio.dev pages and should be verified on docs.composio.dev.
Can Harbor consume MCP servers from Composio?: Yes. Harbor explicitly supports consuming third-party MCP servers as plugins. A Composio-managed connector exposed over MCP can be installed into a Harbor workspace and invoked through `hrbr exec` like any other plugin tool.

Primary sources

These are the competitor-owned pages used to ground this comparison. We link primary sources instead of copying unsupported market claims.

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Ready to switch?

See pricing or review Harbor's security posture.