Best AI Security markBest AI Security

Tool review · Checked against vendor sites, September 2026

Prompt Security review (2026): AI security from SentinelOne

The verdict

Prompt Security is the natural choice for SentinelOne Singularity customers: it inventories AI tools and code assistants, including shadow AI, maps agents and MCP servers, and protects homegrown AI apps. Its public pages say little about how it deploys or how it decides on individual tool calls, which holds its score down.

Rank =7 of 9

Best for SentinelOne customers

Owner: SentinelOne (acquisition announced 5 August 2025)

Visit Prompt Security

What does Prompt Security do?

  • Discovers, governs and protects AI use across employees and developers, including an inventory of every AI tool and code assistant and unsanctioned shadow AI.
  • Protects developers using GitHub Copilot, Cursor and Claude Code from exposing IP or secrets.
  • Maps every agent and MCP server and discovers shadow MCP servers and unsanctioned agent deployments.
  • Secures homegrown AI apps from pre-production testing (prompt injection, jailbreaks, data poisoning) through runtime enforcement.
  • Publishes open-source tools including ClawSec, OneClaw and the Prompt Fuzzer.
  • SentinelOne announced its agreement to acquire Prompt Security on 5 August 2025 and now describes Prompt Security as built into the SentinelOne Singularity Platform.

Source: SentinelOne Prompt Security page · SentinelOne press release, 5 August 2025 · prompt.security · Reviewed Sep 2026

How does Prompt Security deploy?

SentinelOne says Prompt Security deploys in minutes and is part of the Singularity Platform that protects endpoints, cloud, identity and data. The specific deployment method (browser extension, endpoint agent, IDE extension or proxy) is not detailed on the page we reviewed.

Source: SentinelOne Prompt Security page · SentinelOne press release, 5 August 2025 · prompt.security · Reviewed Sep 2026

How does Prompt Security score?

Endpoint and agent visibilityWeight 22%7/10

Inventories AI tools and code assistants, including shadow AI, and maps agents and MCP servers.

LOWEST IN GUIDE
MCP and tool-call controlWeight 20%6/10

Governs what agents and MCP servers can do; per-tool-call enforcement is not detailed.

LOWEST IN GUIDE
Policy granularityWeight 15%7/10

Prevents prompt injection and data leakage for tools such as GitHub Copilot, Cursor and Claude Code.

Agent vs human identity and auditWeight 12%5/10

Agent vs human attribution not described on the pages we reviewed.

Deployment footprintWeight 13%6/10

Built into the SentinelOne Singularity Platform; the deployment method is not detailed.

Coverage beyond the endpointWeight 8%8/10

Employees, developers and homegrown AI apps from testing to runtime.

HIGHEST IN GUIDE
Maturity and transparencyWeight 10%8/10

Backed by SentinelOne, which announced the acquisition on 5 August 2025; pricing not published.

Total

How we score

Where is Prompt Security strongest?

  • Coverage of employees, developers and homegrown apps.
  • Part of an established endpoint platform.
  • Active open-source and research output.

What should buyers check before choosing Prompt Security?

  • Deployment method and per-tool-call enforcement are not described publicly.
  • Agent vs human attribution is not described.
  • Pricing is not published.

Who should shortlist Prompt Security?

Shortlist Prompt Security if you run SentinelOne Singularity and want AI usage and code assistant protection in the same platform.

What does Prompt Security cost?

Contact sales. Pricing is not published.

Frequently asked questions

Is Prompt Security part of SentinelOne?

Yes. SentinelOne announced the acquisition on 5 August 2025, and Prompt Security now brands itself "From SentinelOne".

Related

Head to head

Sources