AI Governance Safety & Evaluation Enterprise Only

Silmaril

Adaptive runtime firewall for securing autonomous AI agent execution

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PricingEnterprise Only
Starting priceContact sales
Free planNo
Free trialYes
APIYes
Open sourceNo
DeploymentHybrid
Last verifiedJuly 30, 2026
Overview

Tool overview

Silmaril is listed under AI Governance Safety & Evaluation AI tools.

Summary

What is Silmaril?

Silmaril is an AI application firewall for agentic systems. It evaluates user intent, application context, tool calls, and accumulated execution state to block prompt injection, tool abuse, data exfiltration, and multi-step attacks before harmful actions occur.

Best fit

Best for

AI engineering teams securing tool-using agents and application gateways

Audience

Who is it for?

AI security teamsAgent platform engineersApplication security teamsAI infrastructure teamsFrontier model labs
Recommendation

Decision note

Suitable for evaluation after confirming final commercial terms, permissions, data handling, lifecycle status, and edit-screen aliases. Keep Needs Review enabled until a human verifies the published profile.

Capabilities

Key features

Context-aware classification across execution state

Blocking for prompts, tools, commands, and outputs

Hooks for Codex, Claude Code, OpenClaw, and Hermes

SDKs for TypeScript, Python, Go, and Java

Managed and self-hosted deployment options

Workflows

Use cases

Blocking indirect prompt injection

Securing coding-agent tool execution

Protecting AI gateways and agent fleets

Threat hunting against agent applications

Running shadow-mode security validation

Strengths

Pros

  • Evaluates more than isolated input text
  • Supports several runtime integration paths
  • Self-hosted mode keeps data in customer infrastructure
  • Published SDK documentation and versions
Considerations

Cons

  • Provisioning is not self-service
  • Commercial pricing is not public
  • Security decisions still require operational tuning
Considerations

Limitations

No runtime firewall guarantees complete protection. Teams should validate coverage, latency, false positives, fail-open behavior, incident response, and permissions, and retain layered security controls and human oversight.

Cost

Pricing details

Pricing modelEnterprise Only
Starting priceContact sales
Free planNo
Free trialYes
Pricing context

Billing options

Custom contractManaged or self-hosted deployment
Pricing context

Pricing note

Silmaril is not self-service. Customers book a call to provision credentials and choose managed or self-hosted deployment. No public recurring price, ongoing free plan, or product trial is published.

View official pricing
Compatibility

Supported languages

  • TypeScript
  • Python
  • Go
  • Java
Connectivity

Integrations

LiteLLM

Vercel AI Gateway

Codex

Claude Code

OpenClaw

Hermes

AWS

GCP

Azure

Oracle Cloud

Specs

Technical details

PlatformsAPI, Web
Multilingual supportYes
Login requiredYes
Open sourceNo
DeploymentHybrid
CompanySilmaril
Launch year2026
Current versionSDK 0.4.2
Models / versionsSilmaril Firewall Threat-hunting agents
Editions / plansManaged Self-hosted
Data confidenceHigh
Last verifiedJuly 30, 2026
Documentation → Release notes → Data source →
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Answers

Frequently asked questions

Silmaril is an AI application firewall for agentic systems. It evaluates user intent, application context, tool calls, and accumulated execution state to block prompt injection, tool abuse, data exfiltration, and multi-step attacks before harmful actions occur.
AI engineering teams securing tool-using agents and application gateways
The listed pricing model for Silmaril is Enterprise only. Pricing can change, so users should verify the latest plan details on the official website.
Yes. The current profile indicates that a free trial is available.
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