Unified MCP vs Paragon MCP Server (ActionKit)

August 25, 2025

Paragon ActionKit helps teams make SaaS actions available to LLMs. It provides a catalog of pre-built integration actions with JSON Schema/OpenAPI definitions, plus an open-source MCP server that connects to ActionKit.

ActionKit is designed for synchronous action execution. It does not publish a normalized cross-provider data model, and it does not publish a comprehensive, versioned tool-count or endpoint registry the way Unified does. If your product needs category-level normalized objects, broad endpoint access, and real-time data delivery patterns across hundreds of integrations, ActionKit becomes harder to scale without additional per-provider logic.

Unified MCP is a hosted MCP server with published tool counts and region endpoints. With 380+ integrations and 22,566+ callable tools (published and growing), Unified MCP provides broader coverage than Paragon ActionKit and a simpler operational model for AI agent use cases.

Built for AI-first teams, Unified MCP is built on authorization-first, pass-through integrations with attached OpenAPI specs — combining real-time reads/writes, category-level normalized schemas, and a stateless record model into one hosted server.

At a glance: Unified MCP vs Paragon ActionKit / MCP server

Paragon provides a synchronous actions API (ActionKit) and an open-source MCP server you can self-host to connect ActionKit actions to MCP clients. Unified MCP is a fully hosted MCP server that makes integrations callable by agents with category-level normalized objects and expanded provider endpoint coverage via include_external_tools.

Unified MCP offers

• Category-level normalized objects across 380+ integrations
• Expanded provider endpoint coverage with include_external_tools
• Real-time reads/writes routed directly to source APIs
• Stateless record access (no customer records stored)
• Hosted MCP server (no customer-managed MCP infrastructure)
• Multi-region endpoints (US, EU, AU)

Real-time execution vs background automation

ActionKit is documented as a synchronous endpoint for executing actions. That fits agent tool calling where you want immediate results.

Where teams typically add complexity is around ongoing updates (changes over time): triggers, scheduled jobs, and execution history. Paragon supports these patterns across its broader platform, but ActionKit itself is not positioned as an event delivery layer for real-time updates across providers.

Unified is designed around real-time reads/writes and event delivery patterns across platforms:

• Native webhooks when providers support them
• Virtual webhooks when they do not
• Each tool call routes directly to the source API (no cached reads)

For agents, this reduces recency ambiguity and avoids building background jobs for 'keep data up to date' behavior.

Normalized objects vs per-provider action schemas

ActionKit returns per-provider action schemas. For example, Salesforce actions map to Salesforce concepts; HubSpot actions map to HubSpot concepts. Paragon documents cross-app schema conveniences like a universal filter schema, but it does not publish a normalized object model where 'Contact' is a consistent object across CRMs.

Unified provides category-level normalized objects where supported, and provider-specific fields when needed.

• Category-level models standardize objects, fields, enums, and associations
• When you need provider-specific fields or endpoints, include_external_tools expands tool coverage without custom passthrough setup

If you're building product features across many CRMs/ATS/HR platforms, normalization reduces per-provider code paths and long-term maintenance.

Endpoint coverage: published tool counts vs action catalogs

Paragon markets '1000+' actions and '130+' connectors, and ActionKit documentation publishes a supported integrations list. Paragon does not publish a single, versioned snapshot of total tools/endpoints available to agents.

Unified publishes tool counts and expands endpoint coverage beyond the normalized layer:

• Thousands of normalized tools
• Tens of thousands of provider endpoint tools via include_external_tools
• 22,566+ total callable tools (published)

This matters when your agent needs breadth (many integrations) and depth (many endpoints per integration).

Data handling and compliance posture

Paragon stores integration credentials and maintains logs and execution history as part of running its platform. It also offers hosted US/EU environments and managed/unmanaged on-prem deployments for data residency and isolation requirements.

Unified MCP is stateless for customer records:

• No customer record data stored or cached
• Only connection metadata and tokens are retained
• hide_sensitive can remove sensitive fields from tool responses before returning results to the LLM

Deployment model

• Paragon: ActionKit is hosted; the MCP server is available as an open-source, self-hosted component if you want MCP connectivity.
• Unified: MCP is fully hosted — no customer deployment required.

TL;DR — Unified MCP vs Paragon ActionKit

Key takeaways

Paragon ActionKit gives teams a way to execute predefined SaaS actions and connect them to LLMs, including via a self-hosted MCP server. That works well when your use case is limited to a known set of actions and per-provider schemas.

Unified MCP is built for a different class of product. It's designed for teams building AI-native features that depend on real-time reads and writes, category-level normalized objects, and broad endpoint access across hundreds of integrations—without running MCP infrastructure or storing customer records. With published tool counts, multi-region endpoints, and a fully hosted MCP server, Unified reduces ambiguity as your agent surface area grows.

If your roadmap includes copilots, agents, or real-time product features that span many platforms, the architectural differences matter early—and compound over time.

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