Is Koi or Zscaler better for AI endpoint control?

Neither is scored on this site. Koi describes 1 of four product control types and Zscaler 1 on the pages we read, and they differ on 6 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?

Koi: Partly. Zscaler: Not in our sources. Warn or ask: Koi Not in our sources, Zscaler Not in our sources.

Do Koi or Zscaler publish prices?

Koi: Not published. Zscaler: Not published (demo request).

HEAD-TO-HEAD · FACTS ONLY

Koi vs Zscaler: AI endpoint control facts side by side

Short answer

Koi describes 1 of the four product control types on the pages we read and Zscaler describes 1; they differ on on-device control and network or SSE proxy. On decisions, Koi describes some control over tool calls and Zscaler does not describe tool-call decisions on the pages we read. 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: Koi
Dashed teal ring: Zscaler, 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?

Koi (Palo Alto Networks) and Zscaler Generative AI Security, from each product's own pages. Differs is computed from recorded statuses, not wording.
Fact	Koi	Zscaler
Owner	Palo Alto Networks (acquisition completed 14 April 2026)	None
Positioning	Koi, now sold by Palo Alto Networks as Cortex Agentic Endpoint Security, gives visibility into models, MCPs and extensions on endpoints, removes insecure packages, extensions and AI tools in one click, and stops malicious actions.	Zscaler's controls for employee use of generative AI: prompt-level visibility, allow or block by app, DLP blocking across GenAI apps, browser isolation that disables cut, paste and download, and data security for Microsoft Copilot.
How it reaches devices	Available as a Cortex XDR module or as a standalone agent. koi.ai now redirects to the Palo Alto Networks page. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026	Delivered with Zscaler's cloud security service in the network path; endpoint agents are not described on the page we read. Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026
On-device controlDiffers	DescribedAgent-based visibility into models, MCPs and extensions, one-click removal of insecure packages, extensions and AI tools, and blocking of unsafe AI application interactions. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026	Not in our sourcesNot described on the pages we read.
Browser extension	Not in our sourcesNot described on the pages we read.	Not in our sourcesNot described on the pages we read.
Network or SSE proxyDiffers	Not in our sourcesNot described on the pages we read.	DescribedSee all input prompts users send to apps, allow or block apps, block sensitive data with DLP across GenAI, and isolate the browser to disable cut, paste and download. Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026
AI or MCP gateway	Not in our sourcesNot described on the pages we read.	Not in our sourcesNot described on the pages we read.
Names the coding agents it coversDiffers	MatchesA Palo Alto Networks blog of 18 August 2026 names Claude Code, Cursor, Codex and Antigravity. Source: Palo Alto Networks blog: A Quarter of Innovation with Koi Agentic Endpoint Security · Read 11 Oct 2026	Not in our sources
Decides on a tool call before it runsDiffers	PartlyBlocks unsafe AI application interactions and prevents prompt injections; decisions on individual tool calls are not described. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026	Not in our sources
Controls what goes into browser AIDiffers	Not in our sources	MatchesPrompt-level visibility, DLP blocking across GenAI apps, and browser isolation that disables cut, paste and download. Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026
Rolls out through EDR or device management you runDiffers	PartlyA Cortex XDR module, or its own standalone agent. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026	Not in our sources
Can warn or ask instead of only blocking	Not in our sources	Not in our sources
Can block an agent, tool or action	MatchesStops malicious actions and removes insecure packages, extensions and AI tools in one click. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026	MatchesAllow or block GenAI apps, and block sensitive data with DLP. Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026
Has a watch-only or simulation mode	Not in our sources	Not in our sources
Records who or what took each action	Not in our sources	Not in our sources
Also covers SaaS, cloud or homegrown AI	PartlyPalo Alto Networks plans integration with Prisma AIRS, its wider AI security platform. Source: Palo Alto Networks press release: acquisition of Koi completed · Read 27 Sep 2026	PartlyData security for Microsoft Copilot, including misconfigurations. Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026
Has a public price or tiers (vendor site or marketplace)	Not in our sources	Not in our sources
Built into	Offered as a Cortex XDR module. Source: Palo Alto Networks press release: acquisition of Koi completed · Read 27 Sep 2026	None
Works with	None in our sources	None in our sources
Price	Not published. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026	Not published (demo request). Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026

Where do they differ?

On-device control: Koi describes it; Zscaler is not in our sources.
Network or SSE proxy: Koi is not in our sources; Zscaler describes it.
Names the coding agents it covers: Koi matches; Zscaler is not in our sources.
Decides on a tool call before it runs: Koi partly matches; Zscaler is not in our sources.
Controls what goes into browser AI: Koi is not in our sources; Zscaler matches.
Rolls out through EDR or device management you run: Koi partly matches; Zscaler is not in our sources.

Choose Koi if

You already run Palo Alto Networks Cortex XDR
You want to find and remove risky extensions and packages across the fleet

Choose Zscaler if

You already route traffic through Zscaler and want GenAI controls there
Your main risk is sensitive data pasted or uploaded into GenAI web apps

Which limits should you check?

Koi

Agent-based: it adds an agent unless you run it as a Cortex XDR module.
Warn or ask actions and a record that separates a person from an agent are not described on the pages we read, and no pricing is published.

Zscaler

Coding agents, MCP servers and local agent actions are not described on the page we read.
Warn or ask responses are not described, and no pricing is published.

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