Is Harmonic or Zenity better for AI endpoint control?

Neither is scored on this site. Harmonic describes 2 of four product control types and Zenity 1 on the pages we read, and they differ on 9 recorded facts. Which fits depends on the AI tools people use, your devices, where the work happens and whether you block or guide; the finder checks those.

Which of the two decides on a tool call before it runs?

Harmonic: Partly. Zenity: Matches. Warn or ask: Harmonic Matches, Zenity Partly.

Do Harmonic or Zenity publish prices?

Harmonic: Three named tiers (Explore, Guide, Command) with no prices; a full prompt audit log is an add-on on Guide and Command. Zenity: Not published.

HEAD-TO-HEAD · FACTS ONLY

Harmonic vs Zenity: AI endpoint control facts side by side

Short answer

Harmonic describes 2 of the four product control types on the pages we read and Zenity describes 1; they differ on browser extension. On decisions, Harmonic describes some control over tool calls and Zenity decides on a tool call before it runs. We do not score either; the right choice depends on the AI tools people use, your devices, your current stack and whether you block or guide.

By The Device Desk · Endpoint AI Finder · Published 2026-10-11

Desk research from public vendor pages read on 27 September and 11 October 2026. Profiles follow our published method; we did not run the products.

Vendor pages read September and October 2026 · updated 2026-10-13

Where do their controls sit?

Filled or hatched marker: Harmonic
Dashed teal ring: Zenity, described

DEV Filled marker: described on the product pages we read
DEV Hatched marker: partly described (another component, a narrower scope, or method not detailed)
DEV Dashed marker: not in our sources (it may exist; we did not find it)

The map shows where each product's own pages describe a control, or where your answers point. It is not a measure of how well a product works.

What are the facts, side by side?

Harmonic Security and Zenity, from each product's own pages. Differs is computed from recorded statuses, not wording.
Fact	Harmonic	Zenity
Owner	None	None
Positioning	A data protection product for everyday AI use, sold as Explore, Guide and Command, covering browser extensions, desktop apps and CLI tools, MCP gateways and an API.	An AI agent security platform covering AI observability, posture management, exposure management, runtime boundaries, agentic identity, MCP security and AI detection and response, with a long list of SaaS and cloud agent integrations.
How it reaches devices	Rolls out through Intune, JAMF, Kandji or Group Policy. Source: Harmonic Security homepage · Read 27 Sep 2026	Native agent hooks and the Zenity MCP gateway for coding agents; how it reaches endpoints is not detailed. Source: Zenity: coding and personal agents · Read 27 Sep 2026
On-device control	Partly describedDeployment options include desktop apps and AI agents, rolled out through device management; the on-device component is not described in detail. Source: Harmonic Security pricing (re-read) · Read 11 Oct 2026	Partly describedBlocks or modifies a dangerous tool call before it executes through native agent hooks; how it reaches endpoints is not detailed. Source: Zenity: coding and personal agents · Read 27 Sep 2026
Browser extensionDiffers	DescribedBrowser extensions are a listed surface, with block, warn or log actions. Source: Harmonic Security homepage · Read 27 Sep 2026	Not in our sourcesNot described on the pages we read.
Network or SSE proxy	Not in our sourcesNot described on the pages we read.	Not in our sourcesNot described on the pages we read.
AI or MCP gateway	DescribedMCP gateways are a listed surface, and Harmonic Command governs at the MCP layer and at the tool surface. Source: Harmonic Security: Command · Read 27 Sep 2026	DescribedThe Zenity MCP gateway can block or modify a tool call before it executes. Source: Zenity: coding and personal agents · Read 27 Sep 2026
Names the coding agents it covers	MatchesThe Guide tier adds desktop AI apps and developer tools, naming Claude Code, GitHub Copilot, ChatGPT Desktop and Microsoft 365 Copilot. Source: Harmonic Security pricing (re-read) · Read 11 Oct 2026	MatchesNames Claude Code and Cowork, ChatGPT Codex, GitHub Copilot and Cursor. Source: Zenity: coding and personal agents · Read 27 Sep 2026
Decides on a tool call before it runsDiffers	PartlyThe Command tier adds MCP client and server discovery, agent permissions for read, write and execute, and MCP server tool controls. Source: Harmonic Security pricing (re-read) · Read 11 Oct 2026	MatchesBlocks or modifies a dangerous tool call before it executes. Source: Zenity: coding and personal agents · Read 27 Sep 2026
Controls what goes into browser AIDiffers	MatchesBlock, warn or log on AI use in the browser. Source: Harmonic Security homepage · Read 27 Sep 2026	Not in our sources
Rolls out through EDR or device management you runDiffers	MatchesRolls out through Intune, JAMF, Kandji or Group Policy. Source: Harmonic Security homepage · Read 27 Sep 2026	Not in our sources
Can warn or ask instead of only blockingDiffers	MatchesWarn is one of three actions, with block and log. Source: Harmonic Security homepage · Read 27 Sep 2026	PartlyCan modify a tool call as well as block it; asking the user is not described. Source: Zenity: coding and personal agents · Read 27 Sep 2026
Can block an agent, tool or action	MatchesBlock is one of three actions. Source: Harmonic Security homepage · Read 27 Sep 2026	MatchesBlocks a dangerous tool call before it executes. Source: Zenity: coding and personal agents · Read 27 Sep 2026
Has a watch-only or simulation modeDiffers	MatchesLog is one of three actions, for watching before enforcing. Source: Harmonic Security homepage · Read 27 Sep 2026	Not in our sources
Records who or what took each actionDiffers	Not in our sources	PartlyAI observability and agentic identity and access management are named capabilities. Source: Zenity platform · Read 27 Sep 2026
Also covers SaaS, cloud or homegrown AIDiffers	PartlyAn API is listed alongside device surfaces; SaaS or cloud agents are not described. Source: Harmonic Security homepage · Read 27 Sep 2026	MatchesIntegrations include Bedrock, Azure AI Foundry, ChatGPT Enterprise, Claude Enterprise, Copilot Studio, Vertex AI, Microsoft 365 Copilot, Power Platform, Salesforce, Agentforce and ServiceNow. Source: Zenity platform · Read 27 Sep 2026
Has a public price or tiers (vendor site or marketplace)Differs	PartlyNames three tiers (Explore, Guide, Command) on its pricing page, without prices. Source: Harmonic Security: pricing · Read 27 Sep 2026	Not in our sources
Built into	None	None
Works with	None in our sources	None in our sources
Price	Three named tiers (Explore, Guide, Command) with no prices; a full prompt audit log is an add-on on Guide and Command. Source: Harmonic Security pricing (re-read) · Read 11 Oct 2026	Not published. Source: Zenity homepage · Read 27 Sep 2026

Where do they differ?

Browser extension: Harmonic describes it; Zenity is not in our sources.
Decides on a tool call before it runs: Harmonic partly matches; Zenity matches.
Controls what goes into browser AI: Harmonic matches; Zenity is not in our sources.
Rolls out through EDR or device management you run: Harmonic matches; Zenity is not in our sources.
Can warn or ask instead of only blocking: Harmonic matches; Zenity partly matches.
Has a watch-only or simulation mode: Harmonic matches; Zenity is not in our sources.
Records who or what took each action: Harmonic is not in our sources; Zenity partly matches.
Also covers SaaS, cloud or homegrown AI: Harmonic partly matches; Zenity matches.
Has a public price or tiers (vendor site or marketplace): Harmonic partly matches; Zenity is not in our sources.

Choose Harmonic if

Your main risk is employees pasting sensitive data into AI tools and you would rather coach than block
You manage devices with Intune, JAMF, Kandji or Group Policy

Choose Zenity if

Microsoft 365 Copilot, Copilot Studio, Salesforce or ServiceNow agents matter as much as laptops
You want an MCP gateway that can modify a tool call, not only block it

Which limits should you check?

Harmonic

Tier names only, no prices, and the full prompt audit log is an add-on.
An activity record that separates a person from an agent is not described, and prompt injection protection is listed as coming soon.

Zenity

How it reaches endpoints is not detailed on the pages we read.
No pricing published, and asking the user before an action is not described.

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