HEAD-TO-HEAD · FACTS ONLY
Prompt Security vs Zenity: AI endpoint control facts side by side
Short answer
Prompt Security describes 2 of the four product control types on the pages we read and Zenity describes 1; they differ on on-device control, browser extension and AI or MCP gateway. On decisions, Prompt Security does not describe tool-call decisions on the pages we read 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: Prompt Security
- 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)
What are the facts, side by side?
| Fact | Prompt Security | Zenity |
|---|---|---|
| Owner | SentinelOne (acquisition announced 5 August 2025; SentinelOne's blog of 3 September 2025 is titled SentinelOne Acquires Prompt Security) | None |
| Positioning | Prompt Security, now part of SentinelOne, inventories AI tools and code assistants, including unsanctioned shadow AI, through two local sensors, a browser extension and a dedicated AI endpoint agent, and is built into the SentinelOne Singularity Platform. | 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 | Two local sensors: a browser extension and a dedicated AI endpoint agent, managed from the SentinelOne Singularity Platform. Prompt Security argues that MDM or EDR integrations, which mostly run scripts periodically, are not enough. Source: Prompt Security blog: browser and endpoint sensors · Read 11 Oct 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 controlDiffers | DescribedA dedicated AI endpoint agent detects new AI agents, skills and connectors and applies runtime policies; it names GitHub Copilot, Cursor and Claude Code among the code assistants it inventories. Source: Prompt Security blog: browser and endpoint sensors · 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 | DescribedA browser extension inspects prompts, redacts sensitive data and discovers shadow AI. Source: Prompt Security blog: browser and endpoint sensors · Read 11 Oct 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 gatewayDiffers | Not in our sourcesNot described on the pages we read. | 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 | MatchesNames GitHub Copilot, Cursor and Claude Code. Source: SentinelOne: Prompt Security · Read 27 Sep 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 | Not in our sources | 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 | MatchesThe browser extension inspects prompts and redacts sensitive data. Source: Prompt Security blog: browser and endpoint sensors · Read 11 Oct 2026 | Not in our sources |
| Rolls out through EDR or device management you runDiffers | PartlyIts own agent and extension, managed in the SentinelOne console; it does not ride on other EDR or MDM tools. Source: Prompt Security blog: browser and endpoint sensors · Read 11 Oct 2026 | Not in our sources |
| Can warn or ask instead of only blockingDiffers | Not in our sources | 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 actionDiffers | Not in our sources | MatchesBlocks a dangerous tool call before it executes. Source: Zenity: coding and personal agents · Read 27 Sep 2026 |
| Has a watch-only or simulation mode | Not in our sources | 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 AI | MatchesCovers homegrown AI apps from testing to runtime. Source: SentinelOne: Prompt Security · 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) | Not in our sources | Not in our sources |
| Built into | Built into the SentinelOne Singularity Platform. Source: SentinelOne: Prompt Security · Read 27 Sep 2026 | None |
| Works with | None in our sources | None in our sources |
| Price | Not published. Source: SentinelOne: Prompt Security · Read 27 Sep 2026 | Not published. Source: Zenity homepage · Read 27 Sep 2026 |
Where do they differ?
- On-device control: Prompt Security describes it; Zenity partly describes it.
- Browser extension: Prompt Security describes it; Zenity is not in our sources.
- AI or MCP gateway: Prompt Security is not in our sources; Zenity describes it.
- Decides on a tool call before it runs: Prompt Security is not in our sources; Zenity matches.
- Controls what goes into browser AI: Prompt Security matches; Zenity is not in our sources.
- Rolls out through EDR or device management you run: Prompt Security partly matches; Zenity is not in our sources.
- Can warn or ask instead of only blocking: Prompt Security is not in our sources; Zenity partly matches.
- Can block an agent, tool or action: Prompt Security is not in our sources; Zenity matches.
- Records who or what took each action: Prompt Security is not in our sources; Zenity partly matches.
Choose Prompt Security if
- You already run SentinelOne Singularity
- You need an inventory of AI tools and coding assistants first
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?
Prompt Security
- Two new local sensors to roll out, a browser extension and an endpoint agent, unless you already run SentinelOne.
- Tool-call decisions, blocking, warning and activity records for agent actions are not described on the pages we read, and no pricing is published.
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.